mergestate: store about files resolved in favour of other

Committing a merge sometimes wrongly creates a new filenode where it can re-use
an existing one. This happens because the commit code does it's own calculation
and does not know what happened on merge.

This starts storing information in mergestate about files which were
automatically merged and the other/remote version of file was used.
We need this information at commit to pick the filenode parent for the new
commit.

This issue was found by Pierre-Yves David and idea to store the relevant parts
in mergestate is also suggested by him.

Somethings which can be further investigated are:

1) refactoring of commit logic more to depend on this information
2) maybe a more generic solution?

Differential Revision: https://phab.mercurial-scm.org/D8392

mercurial/commands.py

@@ -1,7833 +1,7838 b''
 # commands.py - command processing for mercurial
 #
 # Copyright 2005-2007 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 from __future__ import absolute_import
 
 import difflib
 import errno
 import os
 import re
 import sys
 
 from .i18n import _
 from .node import (
     hex,
     nullid,
     nullrev,
     short,
     wdirhex,
     wdirrev,
 )
 from .pycompat import open
 from . import (
     archival,
     bookmarks,
     bundle2,
     changegroup,
     cmdutil,
     copies,
     debugcommands as debugcommandsmod,
     destutil,
     dirstateguard,
     discovery,
     encoding,
     error,
     exchange,
     extensions,
     filemerge,
     formatter,
     graphmod,
     hbisect,
     help,
     hg,
     logcmdutil,
     merge as mergemod,
     narrowspec,
     obsolete,
     obsutil,
     patch,
     phases,
     pycompat,
     rcutil,
     registrar,
     revsetlang,
     rewriteutil,
     scmutil,
     server,
     shelve as shelvemod,
     state as statemod,
     streamclone,
     tags as tagsmod,
     ui as uimod,
     util,
     verify as verifymod,
     wireprotoserver,
 )
 from .utils import (
     dateutil,
     stringutil,
 )
 
 table = {}
 table.update(debugcommandsmod.command._table)
 
 command = registrar.command(table)
 INTENT_READONLY = registrar.INTENT_READONLY
 
 # common command options
 
 globalopts = [
     (
         b'R',
         b'repository',
         b'',
         _(b'repository root directory or name of overlay bundle file'),
         _(b'REPO'),
     ),
     (b'', b'cwd', b'', _(b'change working directory'), _(b'DIR')),
     (
         b'y',
         b'noninteractive',
         None,
         _(
             b'do not prompt, automatically pick the first choice for all prompts'
         ),
     ),
     (b'q', b'quiet', None, _(b'suppress output')),
     (b'v', b'verbose', None, _(b'enable additional output')),
     (
         b'',
         b'color',
         b'',
         # i18n: 'always', 'auto', 'never', and 'debug' are keywords
         # and should not be translated
         _(b"when to colorize (boolean, always, auto, never, or debug)"),
         _(b'TYPE'),
     ),
     (
         b'',
         b'config',
         [],
         _(b'set/override config option (use \'section.name=value\')'),
         _(b'CONFIG'),
     ),
     (b'', b'debug', None, _(b'enable debugging output')),
     (b'', b'debugger', None, _(b'start debugger')),
     (
         b'',
         b'encoding',
         encoding.encoding,
         _(b'set the charset encoding'),
         _(b'ENCODE'),
     ),
     (
         b'',
         b'encodingmode',
         encoding.encodingmode,
         _(b'set the charset encoding mode'),
         _(b'MODE'),
     ),
     (b'', b'traceback', None, _(b'always print a traceback on exception')),
     (b'', b'time', None, _(b'time how long the command takes')),
     (b'', b'profile', None, _(b'print command execution profile')),
     (b'', b'version', None, _(b'output version information and exit')),
     (b'h', b'help', None, _(b'display help and exit')),
     (b'', b'hidden', False, _(b'consider hidden changesets')),
     (
         b'',
         b'pager',
         b'auto',
         _(b"when to paginate (boolean, always, auto, or never)"),
         _(b'TYPE'),
     ),
 ]
 
 dryrunopts = cmdutil.dryrunopts
 remoteopts = cmdutil.remoteopts
 walkopts = cmdutil.walkopts
 commitopts = cmdutil.commitopts
 commitopts2 = cmdutil.commitopts2
 commitopts3 = cmdutil.commitopts3
 formatteropts = cmdutil.formatteropts
 templateopts = cmdutil.templateopts
 logopts = cmdutil.logopts
 diffopts = cmdutil.diffopts
 diffwsopts = cmdutil.diffwsopts
 diffopts2 = cmdutil.diffopts2
 mergetoolopts = cmdutil.mergetoolopts
 similarityopts = cmdutil.similarityopts
 subrepoopts = cmdutil.subrepoopts
 debugrevlogopts = cmdutil.debugrevlogopts
 
 # Commands start here, listed alphabetically
 
 
 @command(
     b'abort',
     dryrunopts,
     helpcategory=command.CATEGORY_CHANGE_MANAGEMENT,
     helpbasic=True,
 )
 def abort(ui, repo, **opts):
     """abort an unfinished operation (EXPERIMENTAL)
 
     Aborts a multistep operation like graft, histedit, rebase, merge,
     and unshelve if they are in an unfinished state.
 
     use --dry-run/-n to dry run the command.
     """
     dryrun = opts.get('dry_run')
     abortstate = cmdutil.getunfinishedstate(repo)
     if not abortstate:
         raise error.Abort(_(b'no operation in progress'))
     if not abortstate.abortfunc:
         raise error.Abort(
             (
                 _(b"%s in progress but does not support 'hg abort'")
                 % (abortstate._opname)
             ),
             hint=abortstate.hint(),
         )
     if dryrun:
         ui.status(
             _(b'%s in progress, will be aborted\n') % (abortstate._opname)
         )
         return
     return abortstate.abortfunc(ui, repo)
 
 
 @command(
     b'add',
     walkopts + subrepoopts + dryrunopts,
     _(b'[OPTION]... [FILE]...'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
     helpbasic=True,
     inferrepo=True,
 )
 def add(ui, repo, *pats, **opts):
     """add the specified files on the next commit
 
     Schedule files to be version controlled and added to the
     repository.
 
     The files will be added to the repository at the next commit. To
     undo an add before that, see :hg:`forget`.
 
     If no names are given, add all files to the repository (except
     files matching ``.hgignore``).
 
     .. container:: verbose
 
        Examples:
 
          - New (unknown) files are added
            automatically by :hg:`add`::
 
              $ ls
              foo.c
              $ hg status
              ? foo.c
              $ hg add
              adding foo.c
              $ hg status
              A foo.c
 
          - Specific files to be added can be specified::
 
              $ ls
              bar.c  foo.c
              $ hg status
              ? bar.c
              ? foo.c
              $ hg add bar.c
              $ hg status
              A bar.c
              ? foo.c
 
     Returns 0 if all files are successfully added.
     """
 
     m = scmutil.match(repo[None], pats, pycompat.byteskwargs(opts))
     uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True)
     rejected = cmdutil.add(ui, repo, m, b"", uipathfn, False, **opts)
     return rejected and 1 or 0
 
 
 @command(
     b'addremove',
     similarityopts + subrepoopts + walkopts + dryrunopts,
     _(b'[OPTION]... [FILE]...'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
     inferrepo=True,
 )
 def addremove(ui, repo, *pats, **opts):
     """add all new files, delete all missing files
 
     Add all new files and remove all missing files from the
     repository.
 
     Unless names are given, new files are ignored if they match any of
     the patterns in ``.hgignore``. As with add, these changes take
     effect at the next commit.
 
     Use the -s/--similarity option to detect renamed files. This
     option takes a percentage between 0 (disabled) and 100 (files must
     be identical) as its parameter. With a parameter greater than 0,
     this compares every removed file with every added file and records
     those similar enough as renames. Detecting renamed files this way
     can be expensive. After using this option, :hg:`status -C` can be
     used to check which files were identified as moved or renamed. If
     not specified, -s/--similarity defaults to 100 and only renames of
     identical files are detected.
 
     .. container:: verbose
 
        Examples:
 
          - A number of files (bar.c and foo.c) are new,
            while foobar.c has been removed (without using :hg:`remove`)
            from the repository::
 
              $ ls
              bar.c foo.c
              $ hg status
              ! foobar.c
              ? bar.c
              ? foo.c
              $ hg addremove
              adding bar.c
              adding foo.c
              removing foobar.c
              $ hg status
              A bar.c
              A foo.c
              R foobar.c
 
          - A file foobar.c was moved to foo.c without using :hg:`rename`.
            Afterwards, it was edited slightly::
 
              $ ls
              foo.c
              $ hg status
              ! foobar.c
              ? foo.c
              $ hg addremove --similarity 90
              removing foobar.c
              adding foo.c
              recording removal of foobar.c as rename to foo.c (94% similar)
              $ hg status -C
              A foo.c
                foobar.c
              R foobar.c
 
     Returns 0 if all files are successfully added.
     """
     opts = pycompat.byteskwargs(opts)
     if not opts.get(b'similarity'):
         opts[b'similarity'] = b'100'
     matcher = scmutil.match(repo[None], pats, opts)
     relative = scmutil.anypats(pats, opts)
     uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=relative)
     return scmutil.addremove(repo, matcher, b"", uipathfn, opts)
 
 
 @command(
     b'annotate|blame',
     [
         (b'r', b'rev', b'', _(b'annotate the specified revision'), _(b'REV')),
         (
             b'',
             b'follow',
             None,
             _(b'follow copies/renames and list the filename (DEPRECATED)'),
         ),
         (b'', b'no-follow', None, _(b"don't follow copies and renames")),
         (b'a', b'text', None, _(b'treat all files as text')),
         (b'u', b'user', None, _(b'list the author (long with -v)')),
         (b'f', b'file', None, _(b'list the filename')),
         (b'd', b'date', None, _(b'list the date (short with -q)')),
         (b'n', b'number', None, _(b'list the revision number (default)')),
         (b'c', b'changeset', None, _(b'list the changeset')),
         (
             b'l',
             b'line-number',
             None,
             _(b'show line number at the first appearance'),
         ),
         (
             b'',
             b'skip',
             [],
             _(b'revset to not display (EXPERIMENTAL)'),
             _(b'REV'),
         ),
     ]
     + diffwsopts
     + walkopts
     + formatteropts,
     _(b'[-r REV] [-f] [-a] [-u] [-d] [-n] [-c] [-l] FILE...'),
     helpcategory=command.CATEGORY_FILE_CONTENTS,
     helpbasic=True,
     inferrepo=True,
 )
 def annotate(ui, repo, *pats, **opts):
     """show changeset information by line for each file
 
     List changes in files, showing the revision id responsible for
     each line.
 
     This command is useful for discovering when a change was made and
     by whom.
 
     If you include --file, --user, or --date, the revision number is
     suppressed unless you also include --number.
 
     Without the -a/--text option, annotate will avoid processing files
     it detects as binary. With -a, annotate will annotate the file
     anyway, although the results will probably be neither useful
     nor desirable.
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported in addition to the common template
       keywords and functions. See also :hg:`help templates`.
 
       :lines:   List of lines with annotation data.
       :path:    String. Repository-absolute path of the specified file.
 
       And each entry of ``{lines}`` provides the following sub-keywords in
       addition to ``{date}``, ``{node}``, ``{rev}``, ``{user}``, etc.
 
       :line:    String. Line content.
       :lineno:  Integer. Line number at that revision.
       :path:    String. Repository-absolute path of the file at that revision.
 
       See :hg:`help templates.operators` for the list expansion syntax.
 
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
     if not pats:
         raise error.Abort(_(b'at least one filename or pattern is required'))
 
     if opts.get(b'follow'):
         # --follow is deprecated and now just an alias for -f/--file
         # to mimic the behavior of Mercurial before version 1.5
         opts[b'file'] = True
 
     if (
         not opts.get(b'user')
         and not opts.get(b'changeset')
         and not opts.get(b'date')
         and not opts.get(b'file')
     ):
         opts[b'number'] = True
 
     linenumber = opts.get(b'line_number') is not None
     if (
         linenumber
         and (not opts.get(b'changeset'))
         and (not opts.get(b'number'))
     ):
         raise error.Abort(_(b'at least one of -n/-c is required for -l'))
 
     rev = opts.get(b'rev')
     if rev:
         repo = scmutil.unhidehashlikerevs(repo, [rev], b'nowarn')
     ctx = scmutil.revsingle(repo, rev)
 
     ui.pager(b'annotate')
     rootfm = ui.formatter(b'annotate', opts)
     if ui.debugflag:
         shorthex = pycompat.identity
     else:
 
         def shorthex(h):
             return h[:12]
 
     if ui.quiet:
         datefunc = dateutil.shortdate
     else:
         datefunc = dateutil.datestr
     if ctx.rev() is None:
         if opts.get(b'changeset'):
             # omit "+" suffix which is appended to node hex
             def formatrev(rev):
                 if rev == wdirrev:
                     return b'%d' % ctx.p1().rev()
                 else:
                     return b'%d' % rev
 
         else:
 
             def formatrev(rev):
                 if rev == wdirrev:
                     return b'%d+' % ctx.p1().rev()
                 else:
                     return b'%d ' % rev
 
         def formathex(h):
             if h == wdirhex:
                 return b'%s+' % shorthex(hex(ctx.p1().node()))
             else:
                 return b'%s ' % shorthex(h)
 
     else:
         formatrev = b'%d'.__mod__
         formathex = shorthex
 
     opmap = [
         (b'user', b' ', lambda x: x.fctx.user(), ui.shortuser),
         (b'rev', b' ', lambda x: scmutil.intrev(x.fctx), formatrev),
         (b'node', b' ', lambda x: hex(scmutil.binnode(x.fctx)), formathex),
         (b'date', b' ', lambda x: x.fctx.date(), util.cachefunc(datefunc)),
         (b'path', b' ', lambda x: x.fctx.path(), pycompat.bytestr),
         (b'lineno', b':', lambda x: x.lineno, pycompat.bytestr),
     ]
     opnamemap = {
         b'rev': b'number',
         b'node': b'changeset',
         b'path': b'file',
         b'lineno': b'line_number',
     }
 
     if rootfm.isplain():
 
         def makefunc(get, fmt):
             return lambda x: fmt(get(x))
 
     else:
 
         def makefunc(get, fmt):
             return get
 
     datahint = rootfm.datahint()
     funcmap = [
         (makefunc(get, fmt), sep)
         for fn, sep, get, fmt in opmap
         if opts.get(opnamemap.get(fn, fn)) or fn in datahint
     ]
     funcmap[0] = (funcmap[0][0], b'')  # no separator in front of first column
     fields = b' '.join(
         fn
         for fn, sep, get, fmt in opmap
         if opts.get(opnamemap.get(fn, fn)) or fn in datahint
     )
 
     def bad(x, y):
         raise error.Abort(b"%s: %s" % (x, y))
 
     m = scmutil.match(ctx, pats, opts, badfn=bad)
 
     follow = not opts.get(b'no_follow')
     diffopts = patch.difffeatureopts(
         ui, opts, section=b'annotate', whitespace=True
     )
     skiprevs = opts.get(b'skip')
     if skiprevs:
         skiprevs = scmutil.revrange(repo, skiprevs)
 
     uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True)
     for abs in ctx.walk(m):
         fctx = ctx[abs]
         rootfm.startitem()
         rootfm.data(path=abs)
         if not opts.get(b'text') and fctx.isbinary():
             rootfm.plain(_(b"%s: binary file\n") % uipathfn(abs))
             continue
 
         fm = rootfm.nested(b'lines', tmpl=b'{rev}: {line}')
         lines = fctx.annotate(
             follow=follow, skiprevs=skiprevs, diffopts=diffopts
         )
         if not lines:
             fm.end()
             continue
         formats = []
         pieces = []
 
         for f, sep in funcmap:
             l = [f(n) for n in lines]
             if fm.isplain():
                 sizes = [encoding.colwidth(x) for x in l]
                 ml = max(sizes)
                 formats.append([sep + b' ' * (ml - w) + b'%s' for w in sizes])
             else:
                 formats.append([b'%s'] * len(l))
             pieces.append(l)
 
         for f, p, n in zip(zip(*formats), zip(*pieces), lines):
             fm.startitem()
             fm.context(fctx=n.fctx)
             fm.write(fields, b"".join(f), *p)
             if n.skip:
                 fmt = b"* %s"
             else:
                 fmt = b": %s"
             fm.write(b'line', fmt, n.text)
 
         if not lines[-1].text.endswith(b'\n'):
             fm.plain(b'\n')
         fm.end()
 
     rootfm.end()
 
 
 @command(
     b'archive',
     [
         (b'', b'no-decode', None, _(b'do not pass files through decoders')),
         (
             b'p',
             b'prefix',
             b'',
             _(b'directory prefix for files in archive'),
             _(b'PREFIX'),
         ),
         (b'r', b'rev', b'', _(b'revision to distribute'), _(b'REV')),
         (b't', b'type', b'', _(b'type of distribution to create'), _(b'TYPE')),
     ]
     + subrepoopts
     + walkopts,
     _(b'[OPTION]... DEST'),
     helpcategory=command.CATEGORY_IMPORT_EXPORT,
 )
 def archive(ui, repo, dest, **opts):
     '''create an unversioned archive of a repository revision
 
     By default, the revision used is the parent of the working
     directory; use -r/--rev to specify a different revision.
 
     The archive type is automatically detected based on file
     extension (to override, use -t/--type).
 
     .. container:: verbose
 
       Examples:
 
       - create a zip file containing the 1.0 release::
 
           hg archive -r 1.0 project-1.0.zip
 
       - create a tarball excluding .hg files::
 
           hg archive project.tar.gz -X ".hg*"
 
     Valid types are:
 
     :``files``: a directory full of files (default)
     :``tar``:   tar archive, uncompressed
     :``tbz2``:  tar archive, compressed using bzip2
     :``tgz``:   tar archive, compressed using gzip
     :``txz``:   tar archive, compressed using lzma (only in Python 3)
     :``uzip``:  zip archive, uncompressed
     :``zip``:   zip archive, compressed using deflate
 
     The exact name of the destination archive or directory is given
     using a format string; see :hg:`help export` for details.
 
     Each member added to an archive file has a directory prefix
     prepended. Use -p/--prefix to specify a format string for the
     prefix. The default is the basename of the archive, with suffixes
     removed.
 
     Returns 0 on success.
     '''
 
     opts = pycompat.byteskwargs(opts)
     rev = opts.get(b'rev')
     if rev:
         repo = scmutil.unhidehashlikerevs(repo, [rev], b'nowarn')
     ctx = scmutil.revsingle(repo, rev)
     if not ctx:
         raise error.Abort(_(b'no working directory: please specify a revision'))
     node = ctx.node()
     dest = cmdutil.makefilename(ctx, dest)
     if os.path.realpath(dest) == repo.root:
         raise error.Abort(_(b'repository root cannot be destination'))
 
     kind = opts.get(b'type') or archival.guesskind(dest) or b'files'
     prefix = opts.get(b'prefix')
 
     if dest == b'-':
         if kind == b'files':
             raise error.Abort(_(b'cannot archive plain files to stdout'))
         dest = cmdutil.makefileobj(ctx, dest)
         if not prefix:
             prefix = os.path.basename(repo.root) + b'-%h'
 
     prefix = cmdutil.makefilename(ctx, prefix)
     match = scmutil.match(ctx, [], opts)
     archival.archive(
         repo,
         dest,
         node,
         kind,
         not opts.get(b'no_decode'),
         match,
         prefix,
         subrepos=opts.get(b'subrepos'),
     )
 
 
 @command(
     b'backout',
     [
         (
             b'',
             b'merge',
             None,
             _(b'merge with old dirstate parent after backout'),
         ),
         (
             b'',
             b'commit',
             None,
             _(b'commit if no conflicts were encountered (DEPRECATED)'),
         ),
         (b'', b'no-commit', None, _(b'do not commit')),
         (
             b'',
             b'parent',
             b'',
             _(b'parent to choose when backing out merge (DEPRECATED)'),
             _(b'REV'),
         ),
         (b'r', b'rev', b'', _(b'revision to backout'), _(b'REV')),
         (b'e', b'edit', False, _(b'invoke editor on commit messages')),
     ]
     + mergetoolopts
     + walkopts
     + commitopts
     + commitopts2,
     _(b'[OPTION]... [-r] REV'),
     helpcategory=command.CATEGORY_CHANGE_MANAGEMENT,
 )
 def backout(ui, repo, node=None, rev=None, **opts):
     '''reverse effect of earlier changeset
 
     Prepare a new changeset with the effect of REV undone in the
     current working directory. If no conflicts were encountered,
     it will be committed immediately.
 
     If REV is the parent of the working directory, then this new changeset
     is committed automatically (unless --no-commit is specified).
 
     .. note::
 
        :hg:`backout` cannot be used to fix either an unwanted or
        incorrect merge.
 
     .. container:: verbose
 
       Examples:
 
       - Reverse the effect of the parent of the working directory.
         This backout will be committed immediately::
 
           hg backout -r .
 
       - Reverse the effect of previous bad revision 23::
 
           hg backout -r 23
 
       - Reverse the effect of previous bad revision 23 and
         leave changes uncommitted::
 
           hg backout -r 23 --no-commit
           hg commit -m "Backout revision 23"
 
       By default, the pending changeset will have one parent,
       maintaining a linear history. With --merge, the pending
       changeset will instead have two parents: the old parent of the
       working directory and a new child of REV that simply undoes REV.
 
       Before version 1.7, the behavior without --merge was equivalent
       to specifying --merge followed by :hg:`update --clean .` to
       cancel the merge and leave the child of REV as a head to be
       merged separately.
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     See :hg:`help revert` for a way to restore files to the state
     of another revision.
 
     Returns 0 on success, 1 if nothing to backout or there are unresolved
     files.
     '''
     with repo.wlock(), repo.lock():
         return _dobackout(ui, repo, node, rev, **opts)
 
 
 def _dobackout(ui, repo, node=None, rev=None, **opts):
     opts = pycompat.byteskwargs(opts)
     if opts.get(b'commit') and opts.get(b'no_commit'):
         raise error.Abort(_(b"cannot use --commit with --no-commit"))
     if opts.get(b'merge') and opts.get(b'no_commit'):
         raise error.Abort(_(b"cannot use --merge with --no-commit"))
 
     if rev and node:
         raise error.Abort(_(b"please specify just one revision"))
 
     if not rev:
         rev = node
 
     if not rev:
         raise error.Abort(_(b"please specify a revision to backout"))
 
     date = opts.get(b'date')
     if date:
         opts[b'date'] = dateutil.parsedate(date)
 
     cmdutil.checkunfinished(repo)
     cmdutil.bailifchanged(repo)
     node = scmutil.revsingle(repo, rev).node()
 
     op1, op2 = repo.dirstate.parents()
     if not repo.changelog.isancestor(node, op1):
         raise error.Abort(_(b'cannot backout change that is not an ancestor'))
 
     p1, p2 = repo.changelog.parents(node)
     if p1 == nullid:
         raise error.Abort(_(b'cannot backout a change with no parents'))
     if p2 != nullid:
         if not opts.get(b'parent'):
             raise error.Abort(_(b'cannot backout a merge changeset'))
         p = repo.lookup(opts[b'parent'])
         if p not in (p1, p2):
             raise error.Abort(
                 _(b'%s is not a parent of %s') % (short(p), short(node))
             )
         parent = p
     else:
         if opts.get(b'parent'):
             raise error.Abort(_(b'cannot use --parent on non-merge changeset'))
         parent = p1
 
     # the backout should appear on the same branch
     branch = repo.dirstate.branch()
     bheads = repo.branchheads(branch)
     rctx = scmutil.revsingle(repo, hex(parent))
     if not opts.get(b'merge') and op1 != node:
         with dirstateguard.dirstateguard(repo, b'backout'):
             overrides = {(b'ui', b'forcemerge'): opts.get(b'tool', b'')}
             with ui.configoverride(overrides, b'backout'):
                 stats = mergemod.update(
                     repo,
                     parent,
                     branchmerge=True,
                     force=True,
                     ancestor=node,
                     mergeancestor=False,
                 )
             repo.setparents(op1, op2)
         hg._showstats(repo, stats)
         if stats.unresolvedcount:
             repo.ui.status(
                 _(b"use 'hg resolve' to retry unresolved file merges\n")
             )
             return 1
     else:
         hg.clean(repo, node, show_stats=False)
         repo.dirstate.setbranch(branch)
         cmdutil.revert(ui, repo, rctx, repo.dirstate.parents())
 
     if opts.get(b'no_commit'):
         msg = _(b"changeset %s backed out, don't forget to commit.\n")
         ui.status(msg % short(node))
         return 0
 
     def commitfunc(ui, repo, message, match, opts):
         editform = b'backout'
         e = cmdutil.getcommiteditor(
             editform=editform, **pycompat.strkwargs(opts)
         )
         if not message:
             # we don't translate commit messages
             message = b"Backed out changeset %s" % short(node)
             e = cmdutil.getcommiteditor(edit=True, editform=editform)
         return repo.commit(
             message, opts.get(b'user'), opts.get(b'date'), match, editor=e
         )
 
     newnode = cmdutil.commit(ui, repo, commitfunc, [], opts)
     if not newnode:
         ui.status(_(b"nothing changed\n"))
         return 1
     cmdutil.commitstatus(repo, newnode, branch, bheads)
 
     def nice(node):
         return b'%d:%s' % (repo.changelog.rev(node), short(node))
 
     ui.status(
         _(b'changeset %s backs out changeset %s\n')
         % (nice(repo.changelog.tip()), nice(node))
     )
     if opts.get(b'merge') and op1 != node:
         hg.clean(repo, op1, show_stats=False)
         ui.status(
             _(b'merging with changeset %s\n') % nice(repo.changelog.tip())
         )
         overrides = {(b'ui', b'forcemerge'): opts.get(b'tool', b'')}
         with ui.configoverride(overrides, b'backout'):
             return hg.merge(repo[b'tip'])
     return 0
 
 
 @command(
     b'bisect',
     [
         (b'r', b'reset', False, _(b'reset bisect state')),
         (b'g', b'good', False, _(b'mark changeset good')),
         (b'b', b'bad', False, _(b'mark changeset bad')),
         (b's', b'skip', False, _(b'skip testing changeset')),
         (b'e', b'extend', False, _(b'extend the bisect range')),
         (
             b'c',
             b'command',
             b'',
             _(b'use command to check changeset state'),
             _(b'CMD'),
         ),
         (b'U', b'noupdate', False, _(b'do not update to target')),
     ],
     _(b"[-gbsr] [-U] [-c CMD] [REV]"),
     helpcategory=command.CATEGORY_CHANGE_NAVIGATION,
 )
 def bisect(
     ui,
     repo,
     rev=None,
     extra=None,
     command=None,
     reset=None,
     good=None,
     bad=None,
     skip=None,
     extend=None,
     noupdate=None,
 ):
     """subdivision search of changesets
 
     This command helps to find changesets which introduce problems. To
     use, mark the earliest changeset you know exhibits the problem as
     bad, then mark the latest changeset which is free from the problem
     as good. Bisect will update your working directory to a revision
     for testing (unless the -U/--noupdate option is specified). Once
     you have performed tests, mark the working directory as good or
     bad, and bisect will either update to another candidate changeset
     or announce that it has found the bad revision.
 
     As a shortcut, you can also use the revision argument to mark a
     revision as good or bad without checking it out first.
 
     If you supply a command, it will be used for automatic bisection.
     The environment variable HG_NODE will contain the ID of the
     changeset being tested. The exit status of the command will be
     used to mark revisions as good or bad: status 0 means good, 125
     means to skip the revision, 127 (command not found) will abort the
     bisection, and any other non-zero exit status means the revision
     is bad.
 
     .. container:: verbose
 
       Some examples:
 
       - start a bisection with known bad revision 34, and good revision 12::
 
           hg bisect --bad 34
           hg bisect --good 12
 
       - advance the current bisection by marking current revision as good or
         bad::
 
           hg bisect --good
           hg bisect --bad
 
       - mark the current revision, or a known revision, to be skipped (e.g. if
         that revision is not usable because of another issue)::
 
           hg bisect --skip
           hg bisect --skip 23
 
       - skip all revisions that do not touch directories ``foo`` or ``bar``::
 
           hg bisect --skip "!( file('path:foo') & file('path:bar') )"
 
       - forget the current bisection::
 
           hg bisect --reset
 
       - use 'make && make tests' to automatically find the first broken
         revision::
 
           hg bisect --reset
           hg bisect --bad 34
           hg bisect --good 12
           hg bisect --command "make && make tests"
 
       - see all changesets whose states are already known in the current
         bisection::
 
           hg log -r "bisect(pruned)"
 
       - see the changeset currently being bisected (especially useful
         if running with -U/--noupdate)::
 
           hg log -r "bisect(current)"
 
       - see all changesets that took part in the current bisection::
 
           hg log -r "bisect(range)"
 
       - you can even get a nice graph::
 
           hg log --graph -r "bisect(range)"
 
       See :hg:`help revisions.bisect` for more about the `bisect()` predicate.
 
     Returns 0 on success.
     """
     # backward compatibility
     if rev in b"good bad reset init".split():
         ui.warn(_(b"(use of 'hg bisect <cmd>' is deprecated)\n"))
         cmd, rev, extra = rev, extra, None
         if cmd == b"good":
             good = True
         elif cmd == b"bad":
             bad = True
         else:
             reset = True
     elif extra:
         raise error.Abort(_(b'incompatible arguments'))
 
     incompatibles = {
         b'--bad': bad,
         b'--command': bool(command),
         b'--extend': extend,
         b'--good': good,
         b'--reset': reset,
         b'--skip': skip,
     }
 
     enabled = [x for x in incompatibles if incompatibles[x]]
 
     if len(enabled) > 1:
         raise error.Abort(
             _(b'%s and %s are incompatible') % tuple(sorted(enabled)[0:2])
         )
 
     if reset:
         hbisect.resetstate(repo)
         return
 
     state = hbisect.load_state(repo)
 
     # update state
     if good or bad or skip:
         if rev:
             nodes = [repo[i].node() for i in scmutil.revrange(repo, [rev])]
         else:
             nodes = [repo.lookup(b'.')]
         if good:
             state[b'good'] += nodes
         elif bad:
             state[b'bad'] += nodes
         elif skip:
             state[b'skip'] += nodes
         hbisect.save_state(repo, state)
         if not (state[b'good'] and state[b'bad']):
             return
 
     def mayupdate(repo, node, show_stats=True):
         """common used update sequence"""
         if noupdate:
             return
         cmdutil.checkunfinished(repo)
         cmdutil.bailifchanged(repo)
         return hg.clean(repo, node, show_stats=show_stats)
 
     displayer = logcmdutil.changesetdisplayer(ui, repo, {})
 
     if command:
         changesets = 1
         if noupdate:
             try:
                 node = state[b'current'][0]
             except LookupError:
                 raise error.Abort(
                     _(
                         b'current bisect revision is unknown - '
                         b'start a new bisect to fix'
                     )
                 )
         else:
             node, p2 = repo.dirstate.parents()
             if p2 != nullid:
                 raise error.Abort(_(b'current bisect revision is a merge'))
         if rev:
             node = repo[scmutil.revsingle(repo, rev, node)].node()
         with hbisect.restore_state(repo, state, node):
             while changesets:
                 # update state
                 state[b'current'] = [node]
                 hbisect.save_state(repo, state)
                 status = ui.system(
                     command,
                     environ={b'HG_NODE': hex(node)},
                     blockedtag=b'bisect_check',
                 )
                 if status == 125:
                     transition = b"skip"
                 elif status == 0:
                     transition = b"good"
                 # status < 0 means process was killed
                 elif status == 127:
                     raise error.Abort(_(b"failed to execute %s") % command)
                 elif status < 0:
                     raise error.Abort(_(b"%s killed") % command)
                 else:
                     transition = b"bad"
                 state[transition].append(node)
                 ctx = repo[node]
                 ui.status(
                     _(b'changeset %d:%s: %s\n') % (ctx.rev(), ctx, transition)
                 )
                 hbisect.checkstate(state)
                 # bisect
                 nodes, changesets, bgood = hbisect.bisect(repo, state)
                 # update to next check
                 node = nodes[0]
                 mayupdate(repo, node, show_stats=False)
         hbisect.printresult(ui, repo, state, displayer, nodes, bgood)
         return
 
     hbisect.checkstate(state)
 
     # actually bisect
     nodes, changesets, good = hbisect.bisect(repo, state)
     if extend:
         if not changesets:
             extendnode = hbisect.extendrange(repo, state, nodes, good)
             if extendnode is not None:
                 ui.write(
                     _(b"Extending search to changeset %d:%s\n")
                     % (extendnode.rev(), extendnode)
                 )
                 state[b'current'] = [extendnode.node()]
                 hbisect.save_state(repo, state)
                 return mayupdate(repo, extendnode.node())
         raise error.Abort(_(b"nothing to extend"))
 
     if changesets == 0:
         hbisect.printresult(ui, repo, state, displayer, nodes, good)
     else:
         assert len(nodes) == 1  # only a single node can be tested next
         node = nodes[0]
         # compute the approximate number of remaining tests
         tests, size = 0, 2
         while size <= changesets:
             tests, size = tests + 1, size * 2
         rev = repo.changelog.rev(node)
         ui.write(
             _(
                 b"Testing changeset %d:%s "
                 b"(%d changesets remaining, ~%d tests)\n"
             )
             % (rev, short(node), changesets, tests)
         )
         state[b'current'] = [node]
         hbisect.save_state(repo, state)
         return mayupdate(repo, node)
 
 
 @command(
     b'bookmarks|bookmark',
     [
         (b'f', b'force', False, _(b'force')),
         (b'r', b'rev', b'', _(b'revision for bookmark action'), _(b'REV')),
         (b'd', b'delete', False, _(b'delete a given bookmark')),
         (b'm', b'rename', b'', _(b'rename a given bookmark'), _(b'OLD')),
         (b'i', b'inactive', False, _(b'mark a bookmark inactive')),
         (b'l', b'list', False, _(b'list existing bookmarks')),
     ]
     + formatteropts,
     _(b'hg bookmarks [OPTIONS]... [NAME]...'),
     helpcategory=command.CATEGORY_CHANGE_ORGANIZATION,
 )
 def bookmark(ui, repo, *names, **opts):
     '''create a new bookmark or list existing bookmarks
 
     Bookmarks are labels on changesets to help track lines of development.
     Bookmarks are unversioned and can be moved, renamed and deleted.
     Deleting or moving a bookmark has no effect on the associated changesets.
 
     Creating or updating to a bookmark causes it to be marked as 'active'.
     The active bookmark is indicated with a '*'.
     When a commit is made, the active bookmark will advance to the new commit.
     A plain :hg:`update` will also advance an active bookmark, if possible.
     Updating away from a bookmark will cause it to be deactivated.
 
     Bookmarks can be pushed and pulled between repositories (see
     :hg:`help push` and :hg:`help pull`). If a shared bookmark has
     diverged, a new 'divergent bookmark' of the form 'name@path' will
     be created. Using :hg:`merge` will resolve the divergence.
 
     Specifying bookmark as '.' to -m/-d/-l options is equivalent to specifying
     the active bookmark's name.
 
     A bookmark named '@' has the special property that :hg:`clone` will
     check it out by default if it exists.
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported in addition to the common template
       keywords and functions such as ``{bookmark}``. See also
       :hg:`help templates`.
 
       :active:  Boolean. True if the bookmark is active.
 
       Examples:
 
       - create an active bookmark for a new line of development::
 
           hg book new-feature
 
       - create an inactive bookmark as a place marker::
 
           hg book -i reviewed
 
       - create an inactive bookmark on another changeset::
 
           hg book -r .^ tested
 
       - rename bookmark turkey to dinner::
 
           hg book -m turkey dinner
 
       - move the '@' bookmark from another branch::
 
           hg book -f @
 
       - print only the active bookmark name::
 
           hg book -ql .
     '''
     opts = pycompat.byteskwargs(opts)
     force = opts.get(b'force')
     rev = opts.get(b'rev')
     inactive = opts.get(b'inactive')  # meaning add/rename to inactive bookmark
 
     action = cmdutil.check_at_most_one_arg(opts, b'delete', b'rename', b'list')
     if action:
         cmdutil.check_incompatible_arguments(opts, action, [b'rev'])
     elif names or rev:
         action = b'add'
     elif inactive:
         action = b'inactive'  # meaning deactivate
     else:
         action = b'list'
 
     cmdutil.check_incompatible_arguments(
         opts, b'inactive', [b'delete', b'list']
     )
     if not names and action in {b'add', b'delete'}:
         raise error.Abort(_(b"bookmark name required"))
 
     if action in {b'add', b'delete', b'rename', b'inactive'}:
         with repo.wlock(), repo.lock(), repo.transaction(b'bookmark') as tr:
             if action == b'delete':
                 names = pycompat.maplist(repo._bookmarks.expandname, names)
                 bookmarks.delete(repo, tr, names)
             elif action == b'rename':
                 if not names:
                     raise error.Abort(_(b"new bookmark name required"))
                 elif len(names) > 1:
                     raise error.Abort(_(b"only one new bookmark name allowed"))
                 oldname = repo._bookmarks.expandname(opts[b'rename'])
                 bookmarks.rename(repo, tr, oldname, names[0], force, inactive)
             elif action == b'add':
                 bookmarks.addbookmarks(repo, tr, names, rev, force, inactive)
             elif action == b'inactive':
                 if len(repo._bookmarks) == 0:
                     ui.status(_(b"no bookmarks set\n"))
                 elif not repo._activebookmark:
                     ui.status(_(b"no active bookmark\n"))
                 else:
                     bookmarks.deactivate(repo)
     elif action == b'list':
         names = pycompat.maplist(repo._bookmarks.expandname, names)
         with ui.formatter(b'bookmarks', opts) as fm:
             bookmarks.printbookmarks(ui, repo, fm, names)
     else:
         raise error.ProgrammingError(b'invalid action: %s' % action)
 
 
 @command(
     b'branch',
     [
         (
             b'f',
             b'force',
             None,
             _(b'set branch name even if it shadows an existing branch'),
         ),
         (b'C', b'clean', None, _(b'reset branch name to parent branch name')),
         (
             b'r',
             b'rev',
             [],
             _(b'change branches of the given revs (EXPERIMENTAL)'),
         ),
     ],
     _(b'[-fC] [NAME]'),
     helpcategory=command.CATEGORY_CHANGE_ORGANIZATION,
 )
 def branch(ui, repo, label=None, **opts):
     """set or show the current branch name
 
     .. note::
 
        Branch names are permanent and global. Use :hg:`bookmark` to create a
        light-weight bookmark instead. See :hg:`help glossary` for more
        information about named branches and bookmarks.
 
     With no argument, show the current branch name. With one argument,
     set the working directory branch name (the branch will not exist
     in the repository until the next commit). Standard practice
     recommends that primary development take place on the 'default'
     branch.
 
     Unless -f/--force is specified, branch will not let you set a
     branch name that already exists.
 
     Use -C/--clean to reset the working directory branch to that of
     the parent of the working directory, negating a previous branch
     change.
 
     Use the command :hg:`update` to switch to an existing branch. Use
     :hg:`commit --close-branch` to mark this branch head as closed.
     When all heads of a branch are closed, the branch will be
     considered closed.
 
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
     revs = opts.get(b'rev')
     if label:
         label = label.strip()
 
     if not opts.get(b'clean') and not label:
         if revs:
             raise error.Abort(_(b"no branch name specified for the revisions"))
         ui.write(b"%s\n" % repo.dirstate.branch())
         return
 
     with repo.wlock():
         if opts.get(b'clean'):
             label = repo[b'.'].branch()
             repo.dirstate.setbranch(label)
             ui.status(_(b'reset working directory to branch %s\n') % label)
         elif label:
 
             scmutil.checknewlabel(repo, label, b'branch')
             if revs:
                 return cmdutil.changebranch(ui, repo, revs, label, opts)
 
             if not opts.get(b'force') and label in repo.branchmap():
                 if label not in [p.branch() for p in repo[None].parents()]:
                     raise error.Abort(
                         _(b'a branch of the same name already exists'),
                         # i18n: "it" refers to an existing branch
                         hint=_(b"use 'hg update' to switch to it"),
                     )
 
             repo.dirstate.setbranch(label)
             ui.status(_(b'marked working directory as branch %s\n') % label)
 
             # find any open named branches aside from default
             for n, h, t, c in repo.branchmap().iterbranches():
                 if n != b"default" and not c:
                     return 0
             ui.status(
                 _(
                     b'(branches are permanent and global, '
                     b'did you want a bookmark?)\n'
                 )
             )
 
 
 @command(
     b'branches',
     [
         (
             b'a',
             b'active',
             False,
             _(b'show only branches that have unmerged heads (DEPRECATED)'),
         ),
         (b'c', b'closed', False, _(b'show normal and closed branches')),
         (b'r', b'rev', [], _(b'show branch name(s) of the given rev')),
     ]
     + formatteropts,
     _(b'[-c]'),
     helpcategory=command.CATEGORY_CHANGE_ORGANIZATION,
     intents={INTENT_READONLY},
 )
 def branches(ui, repo, active=False, closed=False, **opts):
     """list repository named branches
 
     List the repository's named branches, indicating which ones are
     inactive. If -c/--closed is specified, also list branches which have
     been marked closed (see :hg:`commit --close-branch`).
 
     Use the command :hg:`update` to switch to an existing branch.
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported in addition to the common template
       keywords and functions such as ``{branch}``. See also
       :hg:`help templates`.
 
       :active:  Boolean. True if the branch is active.
       :closed:  Boolean. True if the branch is closed.
       :current: Boolean. True if it is the current branch.
 
     Returns 0.
     """
 
     opts = pycompat.byteskwargs(opts)
     revs = opts.get(b'rev')
     selectedbranches = None
     if revs:
         revs = scmutil.revrange(repo, revs)
         getbi = repo.revbranchcache().branchinfo
         selectedbranches = {getbi(r)[0] for r in revs}
 
     ui.pager(b'branches')
     fm = ui.formatter(b'branches', opts)
     hexfunc = fm.hexfunc
 
     allheads = set(repo.heads())
     branches = []
     for tag, heads, tip, isclosed in repo.branchmap().iterbranches():
         if selectedbranches is not None and tag not in selectedbranches:
             continue
         isactive = False
         if not isclosed:
             openheads = set(repo.branchmap().iteropen(heads))
             isactive = bool(openheads & allheads)
         branches.append((tag, repo[tip], isactive, not isclosed))
     branches.sort(key=lambda i: (i[2], i[1].rev(), i[0], i[3]), reverse=True)
 
     for tag, ctx, isactive, isopen in branches:
         if active and not isactive:
             continue
         if isactive:
             label = b'branches.active'
             notice = b''
         elif not isopen:
             if not closed:
                 continue
             label = b'branches.closed'
             notice = _(b' (closed)')
         else:
             label = b'branches.inactive'
             notice = _(b' (inactive)')
         current = tag == repo.dirstate.branch()
         if current:
             label = b'branches.current'
 
         fm.startitem()
         fm.write(b'branch', b'%s', tag, label=label)
         rev = ctx.rev()
         padsize = max(31 - len(b"%d" % rev) - encoding.colwidth(tag), 0)
         fmt = b' ' * padsize + b' %d:%s'
         fm.condwrite(
             not ui.quiet,
             b'rev node',
             fmt,
             rev,
             hexfunc(ctx.node()),
             label=b'log.changeset changeset.%s' % ctx.phasestr(),
         )
         fm.context(ctx=ctx)
         fm.data(active=isactive, closed=not isopen, current=current)
         if not ui.quiet:
             fm.plain(notice)
         fm.plain(b'\n')
     fm.end()
 
 
 @command(
     b'bundle',
     [
         (
             b'f',
             b'force',
             None,
             _(b'run even when the destination is unrelated'),
         ),
         (
             b'r',
             b'rev',
             [],
             _(b'a changeset intended to be added to the destination'),
             _(b'REV'),
         ),
         (
             b'b',
             b'branch',
             [],
             _(b'a specific branch you would like to bundle'),
             _(b'BRANCH'),
         ),
         (
             b'',
             b'base',
             [],
             _(b'a base changeset assumed to be available at the destination'),
             _(b'REV'),
         ),
         (b'a', b'all', None, _(b'bundle all changesets in the repository')),
         (
             b't',
             b'type',
             b'bzip2',
             _(b'bundle compression type to use'),
             _(b'TYPE'),
         ),
     ]
     + remoteopts,
     _(b'[-f] [-t BUNDLESPEC] [-a] [-r REV]... [--base REV]... FILE [DEST]'),
     helpcategory=command.CATEGORY_IMPORT_EXPORT,
 )
 def bundle(ui, repo, fname, dest=None, **opts):
     """create a bundle file
 
     Generate a bundle file containing data to be transferred to another
     repository.
 
     To create a bundle containing all changesets, use -a/--all
     (or --base null). Otherwise, hg assumes the destination will have
     all the nodes you specify with --base parameters. Otherwise, hg
     will assume the repository has all the nodes in destination, or
     default-push/default if no destination is specified, where destination
     is the repository you provide through DEST option.
 
     You can change bundle format with the -t/--type option. See
     :hg:`help bundlespec` for documentation on this format. By default,
     the most appropriate format is used and compression defaults to
     bzip2.
 
     The bundle file can then be transferred using conventional means
     and applied to another repository with the unbundle or pull
     command. This is useful when direct push and pull are not
     available or when exporting an entire repository is undesirable.
 
     Applying bundles preserves all changeset contents including
     permissions, copy/rename information, and revision history.
 
     Returns 0 on success, 1 if no changes found.
     """
     opts = pycompat.byteskwargs(opts)
     revs = None
     if b'rev' in opts:
         revstrings = opts[b'rev']
         revs = scmutil.revrange(repo, revstrings)
         if revstrings and not revs:
             raise error.Abort(_(b'no commits to bundle'))
 
     bundletype = opts.get(b'type', b'bzip2').lower()
     try:
         bundlespec = exchange.parsebundlespec(repo, bundletype, strict=False)
     except error.UnsupportedBundleSpecification as e:
         raise error.Abort(
             pycompat.bytestr(e),
             hint=_(b"see 'hg help bundlespec' for supported values for --type"),
         )
     cgversion = bundlespec.contentopts[b"cg.version"]
 
     # Packed bundles are a pseudo bundle format for now.
     if cgversion == b's1':
         raise error.Abort(
             _(b'packed bundles cannot be produced by "hg bundle"'),
             hint=_(b"use 'hg debugcreatestreamclonebundle'"),
         )
 
     if opts.get(b'all'):
         if dest:
             raise error.Abort(
                 _(b"--all is incompatible with specifying a destination")
             )
         if opts.get(b'base'):
             ui.warn(_(b"ignoring --base because --all was specified\n"))
         base = [nullrev]
     else:
         base = scmutil.revrange(repo, opts.get(b'base'))
     if cgversion not in changegroup.supportedoutgoingversions(repo):
         raise error.Abort(
             _(b"repository does not support bundle version %s") % cgversion
         )
 
     if base:
         if dest:
             raise error.Abort(
                 _(b"--base is incompatible with specifying a destination")
             )
         common = [repo[rev].node() for rev in base]
         heads = [repo[r].node() for r in revs] if revs else None
         outgoing = discovery.outgoing(repo, common, heads)
     else:
         dest = ui.expandpath(dest or b'default-push', dest or b'default')
         dest, branches = hg.parseurl(dest, opts.get(b'branch'))
         other = hg.peer(repo, opts, dest)
         revs = [repo[r].hex() for r in revs]
         revs, checkout = hg.addbranchrevs(repo, repo, branches, revs)
         heads = revs and pycompat.maplist(repo.lookup, revs) or revs
         outgoing = discovery.findcommonoutgoing(
             repo,
             other,
             onlyheads=heads,
             force=opts.get(b'force'),
             portable=True,
         )
 
     if not outgoing.missing:
         scmutil.nochangesfound(ui, repo, not base and outgoing.excluded)
         return 1
 
     if cgversion == b'01':  # bundle1
         bversion = b'HG10' + bundlespec.wirecompression
         bcompression = None
     elif cgversion in (b'02', b'03'):
         bversion = b'HG20'
         bcompression = bundlespec.wirecompression
     else:
         raise error.ProgrammingError(
             b'bundle: unexpected changegroup version %s' % cgversion
         )
 
     # TODO compression options should be derived from bundlespec parsing.
     # This is a temporary hack to allow adjusting bundle compression
     # level without a) formalizing the bundlespec changes to declare it
     # b) introducing a command flag.
     compopts = {}
     complevel = ui.configint(
         b'experimental', b'bundlecomplevel.' + bundlespec.compression
     )
     if complevel is None:
         complevel = ui.configint(b'experimental', b'bundlecomplevel')
     if complevel is not None:
         compopts[b'level'] = complevel
 
     # Allow overriding the bundling of obsmarker in phases through
     # configuration while we don't have a bundle version that include them
     if repo.ui.configbool(b'experimental', b'evolution.bundle-obsmarker'):
         bundlespec.contentopts[b'obsolescence'] = True
     if repo.ui.configbool(b'experimental', b'bundle-phases'):
         bundlespec.contentopts[b'phases'] = True
 
     bundle2.writenewbundle(
         ui,
         repo,
         b'bundle',
         fname,
         bversion,
         outgoing,
         bundlespec.contentopts,
         compression=bcompression,
         compopts=compopts,
     )
 
 
 @command(
     b'cat',
     [
         (
             b'o',
             b'output',
             b'',
             _(b'print output to file with formatted name'),
             _(b'FORMAT'),
         ),
         (b'r', b'rev', b'', _(b'print the given revision'), _(b'REV')),
         (b'', b'decode', None, _(b'apply any matching decode filter')),
     ]
     + walkopts
     + formatteropts,
     _(b'[OPTION]... FILE...'),
     helpcategory=command.CATEGORY_FILE_CONTENTS,
     inferrepo=True,
     intents={INTENT_READONLY},
 )
 def cat(ui, repo, file1, *pats, **opts):
     """output the current or given revision of files
 
     Print the specified files as they were at the given revision. If
     no revision is given, the parent of the working directory is used.
 
     Output may be to a file, in which case the name of the file is
     given using a template string. See :hg:`help templates`. In addition
     to the common template keywords, the following formatting rules are
     supported:
 
     :``%%``: literal "%" character
     :``%s``: basename of file being printed
     :``%d``: dirname of file being printed, or '.' if in repository root
     :``%p``: root-relative path name of file being printed
     :``%H``: changeset hash (40 hexadecimal digits)
     :``%R``: changeset revision number
     :``%h``: short-form changeset hash (12 hexadecimal digits)
     :``%r``: zero-padded changeset revision number
     :``%b``: basename of the exporting repository
     :``\\``: literal "\\" character
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported in addition to the common template
       keywords and functions. See also :hg:`help templates`.
 
       :data:    String. File content.
       :path:    String. Repository-absolute path of the file.
 
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
     rev = opts.get(b'rev')
     if rev:
         repo = scmutil.unhidehashlikerevs(repo, [rev], b'nowarn')
     ctx = scmutil.revsingle(repo, rev)
     m = scmutil.match(ctx, (file1,) + pats, opts)
     fntemplate = opts.pop(b'output', b'')
     if cmdutil.isstdiofilename(fntemplate):
         fntemplate = b''
 
     if fntemplate:
         fm = formatter.nullformatter(ui, b'cat', opts)
     else:
         ui.pager(b'cat')
         fm = ui.formatter(b'cat', opts)
     with fm:
         return cmdutil.cat(
             ui, repo, ctx, m, fm, fntemplate, b'', **pycompat.strkwargs(opts)
         )
 
 
 @command(
     b'clone',
     [
         (
             b'U',
             b'noupdate',
             None,
             _(
                 b'the clone will include an empty working '
                 b'directory (only a repository)'
             ),
         ),
         (
             b'u',
             b'updaterev',
             b'',
             _(b'revision, tag, or branch to check out'),
             _(b'REV'),
         ),
         (
             b'r',
             b'rev',
             [],
             _(
                 b'do not clone everything, but include this changeset'
                 b' and its ancestors'
             ),
             _(b'REV'),
         ),
         (
             b'b',
             b'branch',
             [],
             _(
                 b'do not clone everything, but include this branch\'s'
                 b' changesets and their ancestors'
             ),
             _(b'BRANCH'),
         ),
         (b'', b'pull', None, _(b'use pull protocol to copy metadata')),
         (b'', b'uncompressed', None, _(b'an alias to --stream (DEPRECATED)')),
         (b'', b'stream', None, _(b'clone with minimal data processing')),
     ]
     + remoteopts,
     _(b'[OPTION]... SOURCE [DEST]'),
     helpcategory=command.CATEGORY_REPO_CREATION,
     helpbasic=True,
     norepo=True,
 )
 def clone(ui, source, dest=None, **opts):
     """make a copy of an existing repository
 
     Create a copy of an existing repository in a new directory.
 
     If no destination directory name is specified, it defaults to the
     basename of the source.
 
     The location of the source is added to the new repository's
     ``.hg/hgrc`` file, as the default to be used for future pulls.
 
     Only local paths and ``ssh://`` URLs are supported as
     destinations. For ``ssh://`` destinations, no working directory or
     ``.hg/hgrc`` will be created on the remote side.
 
     If the source repository has a bookmark called '@' set, that
     revision will be checked out in the new repository by default.
 
     To check out a particular version, use -u/--update, or
     -U/--noupdate to create a clone with no working directory.
 
     To pull only a subset of changesets, specify one or more revisions
     identifiers with -r/--rev or branches with -b/--branch. The
     resulting clone will contain only the specified changesets and
     their ancestors. These options (or 'clone src#rev dest') imply
     --pull, even for local source repositories.
 
     In normal clone mode, the remote normalizes repository data into a common
     exchange format and the receiving end translates this data into its local
     storage format. --stream activates a different clone mode that essentially
     copies repository files from the remote with minimal data processing. This
     significantly reduces the CPU cost of a clone both remotely and locally.
     However, it often increases the transferred data size by 30-40%. This can
     result in substantially faster clones where I/O throughput is plentiful,
     especially for larger repositories. A side-effect of --stream clones is
     that storage settings and requirements on the remote are applied locally:
     a modern client may inherit legacy or inefficient storage used by the
     remote or a legacy Mercurial client may not be able to clone from a
     modern Mercurial remote.
 
     .. note::
 
        Specifying a tag will include the tagged changeset but not the
        changeset containing the tag.
 
     .. container:: verbose
 
       For efficiency, hardlinks are used for cloning whenever the
       source and destination are on the same filesystem (note this
       applies only to the repository data, not to the working
       directory). Some filesystems, such as AFS, implement hardlinking
       incorrectly, but do not report errors. In these cases, use the
       --pull option to avoid hardlinking.
 
       Mercurial will update the working directory to the first applicable
       revision from this list:
 
       a) null if -U or the source repository has no changesets
       b) if -u . and the source repository is local, the first parent of
          the source repository's working directory
       c) the changeset specified with -u (if a branch name, this means the
          latest head of that branch)
       d) the changeset specified with -r
       e) the tipmost head specified with -b
       f) the tipmost head specified with the url#branch source syntax
       g) the revision marked with the '@' bookmark, if present
       h) the tipmost head of the default branch
       i) tip
 
       When cloning from servers that support it, Mercurial may fetch
       pre-generated data from a server-advertised URL or inline from the
       same stream. When this is done, hooks operating on incoming changesets
       and changegroups may fire more than once, once for each pre-generated
       bundle and as well as for any additional remaining data. In addition,
       if an error occurs, the repository may be rolled back to a partial
       clone. This behavior may change in future releases.
       See :hg:`help -e clonebundles` for more.
 
       Examples:
 
       - clone a remote repository to a new directory named hg/::
 
           hg clone https://www.mercurial-scm.org/repo/hg/
 
       - create a lightweight local clone::
 
           hg clone project/ project-feature/
 
       - clone from an absolute path on an ssh server (note double-slash)::
 
           hg clone ssh://user@server//home/projects/alpha/
 
       - do a streaming clone while checking out a specified version::
 
           hg clone --stream http://server/repo -u 1.5
 
       - create a repository without changesets after a particular revision::
 
           hg clone -r 04e544 experimental/ good/
 
       - clone (and track) a particular named branch::
 
           hg clone https://www.mercurial-scm.org/repo/hg/#stable
 
     See :hg:`help urls` for details on specifying URLs.
 
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
     cmdutil.check_at_most_one_arg(opts, b'noupdate', b'updaterev')
 
     # --include/--exclude can come from narrow or sparse.
     includepats, excludepats = None, None
 
     # hg.clone() differentiates between None and an empty set. So make sure
     # patterns are sets if narrow is requested without patterns.
     if opts.get(b'narrow'):
         includepats = set()
         excludepats = set()
 
         if opts.get(b'include'):
             includepats = narrowspec.parsepatterns(opts.get(b'include'))
         if opts.get(b'exclude'):
             excludepats = narrowspec.parsepatterns(opts.get(b'exclude'))
 
     r = hg.clone(
         ui,
         opts,
         source,
         dest,
         pull=opts.get(b'pull'),
         stream=opts.get(b'stream') or opts.get(b'uncompressed'),
         revs=opts.get(b'rev'),
         update=opts.get(b'updaterev') or not opts.get(b'noupdate'),
         branch=opts.get(b'branch'),
         shareopts=opts.get(b'shareopts'),
         storeincludepats=includepats,
         storeexcludepats=excludepats,
         depth=opts.get(b'depth') or None,
     )
 
     return r is None
 
 
 @command(
     b'commit|ci',
     [
         (
             b'A',
             b'addremove',
             None,
             _(b'mark new/missing files as added/removed before committing'),
         ),
         (b'', b'close-branch', None, _(b'mark a branch head as closed')),
         (b'', b'amend', None, _(b'amend the parent of the working directory')),
         (b's', b'secret', None, _(b'use the secret phase for committing')),
         (b'e', b'edit', None, _(b'invoke editor on commit messages')),
         (
             b'',
             b'force-close-branch',
             None,
             _(b'forcibly close branch from a non-head changeset (ADVANCED)'),
         ),
         (b'i', b'interactive', None, _(b'use interactive mode')),
     ]
     + walkopts
     + commitopts
     + commitopts2
     + subrepoopts,
     _(b'[OPTION]... [FILE]...'),
     helpcategory=command.CATEGORY_COMMITTING,
     helpbasic=True,
     inferrepo=True,
 )
 def commit(ui, repo, *pats, **opts):
     """commit the specified files or all outstanding changes
 
     Commit changes to the given files into the repository. Unlike a
     centralized SCM, this operation is a local operation. See
     :hg:`push` for a way to actively distribute your changes.
 
     If a list of files is omitted, all changes reported by :hg:`status`
     will be committed.
 
     If you are committing the result of a merge, do not provide any
     filenames or -I/-X filters.
 
     If no commit message is specified, Mercurial starts your
     configured editor where you can enter a message. In case your
     commit fails, you will find a backup of your message in
     ``.hg/last-message.txt``.
 
     The --close-branch flag can be used to mark the current branch
     head closed. When all heads of a branch are closed, the branch
     will be considered closed and no longer listed.
 
     The --amend flag can be used to amend the parent of the
     working directory with a new commit that contains the changes
     in the parent in addition to those currently reported by :hg:`status`,
     if there are any. The old commit is stored in a backup bundle in
     ``.hg/strip-backup`` (see :hg:`help bundle` and :hg:`help unbundle`
     on how to restore it).
 
     Message, user and date are taken from the amended commit unless
     specified. When a message isn't specified on the command line,
     the editor will open with the message of the amended commit.
 
     It is not possible to amend public changesets (see :hg:`help phases`)
     or changesets that have children.
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     Returns 0 on success, 1 if nothing changed.
 
     .. container:: verbose
 
       Examples:
 
       - commit all files ending in .py::
 
           hg commit --include "set:**.py"
 
       - commit all non-binary files::
 
           hg commit --exclude "set:binary()"
 
       - amend the current commit and set the date to now::
 
           hg commit --amend --date now
     """
     with repo.wlock(), repo.lock():
         return _docommit(ui, repo, *pats, **opts)
 
 
 def _docommit(ui, repo, *pats, **opts):
     if opts.get('interactive'):
         opts.pop('interactive')
         ret = cmdutil.dorecord(
             ui, repo, commit, None, False, cmdutil.recordfilter, *pats, **opts
         )
         # ret can be 0 (no changes to record) or the value returned by
         # commit(), 1 if nothing changed or None on success.
         return 1 if ret == 0 else ret
 
     opts = pycompat.byteskwargs(opts)
     if opts.get(b'subrepos'):
         if opts.get(b'amend'):
             raise error.Abort(_(b'cannot amend with --subrepos'))
         # Let --subrepos on the command line override config setting.
         ui.setconfig(b'ui', b'commitsubrepos', True, b'commit')
 
     cmdutil.checkunfinished(repo, commit=True)
 
     branch = repo[None].branch()
     bheads = repo.branchheads(branch)
 
     extra = {}
     if opts.get(b'close_branch') or opts.get(b'force_close_branch'):
         extra[b'close'] = b'1'
 
         if repo[b'.'].closesbranch():
             raise error.Abort(
                 _(b'current revision is already a branch closing head')
             )
         elif not bheads:
             raise error.Abort(_(b'branch "%s" has no heads to close') % branch)
         elif (
             branch == repo[b'.'].branch()
             and repo[b'.'].node() not in bheads
             and not opts.get(b'force_close_branch')
         ):
             hint = _(
                 b'use --force-close-branch to close branch from a non-head'
                 b' changeset'
             )
             raise error.Abort(_(b'can only close branch heads'), hint=hint)
         elif opts.get(b'amend'):
             if (
                 repo[b'.'].p1().branch() != branch
                 and repo[b'.'].p2().branch() != branch
             ):
                 raise error.Abort(_(b'can only close branch heads'))
 
     if opts.get(b'amend'):
         if ui.configbool(b'ui', b'commitsubrepos'):
             raise error.Abort(_(b'cannot amend with ui.commitsubrepos enabled'))
 
         old = repo[b'.']
         rewriteutil.precheck(repo, [old.rev()], b'amend')
 
         # Currently histedit gets confused if an amend happens while histedit
         # is in progress. Since we have a checkunfinished command, we are
         # temporarily honoring it.
         #
         # Note: eventually this guard will be removed. Please do not expect
         # this behavior to remain.
         if not obsolete.isenabled(repo, obsolete.createmarkersopt):
             cmdutil.checkunfinished(repo)
 
         node = cmdutil.amend(ui, repo, old, extra, pats, opts)
         if node == old.node():
             ui.status(_(b"nothing changed\n"))
             return 1
     else:
 
         def commitfunc(ui, repo, message, match, opts):
             overrides = {}
             if opts.get(b'secret'):
                 overrides[(b'phases', b'new-commit')] = b'secret'
 
             baseui = repo.baseui
             with baseui.configoverride(overrides, b'commit'):
                 with ui.configoverride(overrides, b'commit'):
                     editform = cmdutil.mergeeditform(
                         repo[None], b'commit.normal'
                     )
                     editor = cmdutil.getcommiteditor(
                         editform=editform, **pycompat.strkwargs(opts)
                     )
                     return repo.commit(
                         message,
                         opts.get(b'user'),
                         opts.get(b'date'),
                         match,
                         editor=editor,
                         extra=extra,
                     )
 
         node = cmdutil.commit(ui, repo, commitfunc, pats, opts)
 
         if not node:
             stat = cmdutil.postcommitstatus(repo, pats, opts)
             if stat.deleted:
                 ui.status(
                     _(
                         b"nothing changed (%d missing files, see "
                         b"'hg status')\n"
                     )
                     % len(stat.deleted)
                 )
             else:
                 ui.status(_(b"nothing changed\n"))
             return 1
 
     cmdutil.commitstatus(repo, node, branch, bheads, opts)
 
     if not ui.quiet and ui.configbool(b'commands', b'commit.post-status'):
         status(
             ui,
             repo,
             modified=True,
             added=True,
             removed=True,
             deleted=True,
             unknown=True,
             subrepos=opts.get(b'subrepos'),
         )
 
 
 @command(
     b'config|showconfig|debugconfig',
     [
         (b'u', b'untrusted', None, _(b'show untrusted configuration options')),
         (b'e', b'edit', None, _(b'edit user config')),
         (b'l', b'local', None, _(b'edit repository config')),
         (b'g', b'global', None, _(b'edit global config')),
     ]
     + formatteropts,
     _(b'[-u] [NAME]...'),
     helpcategory=command.CATEGORY_HELP,
     optionalrepo=True,
     intents={INTENT_READONLY},
 )
 def config(ui, repo, *values, **opts):
     """show combined config settings from all hgrc files
 
     With no arguments, print names and values of all config items.
 
     With one argument of the form section.name, print just the value
     of that config item.
 
     With multiple arguments, print names and values of all config
     items with matching section names or section.names.
 
     With --edit, start an editor on the user-level config file. With
     --global, edit the system-wide config file. With --local, edit the
     repository-level config file.
 
     With --debug, the source (filename and line number) is printed
     for each config item.
 
     See :hg:`help config` for more information about config files.
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported. See also :hg:`help templates`.
 
       :name:    String. Config name.
       :source:  String. Filename and line number where the item is defined.
       :value:   String. Config value.
 
     Returns 0 on success, 1 if NAME does not exist.
 
     """
 
     opts = pycompat.byteskwargs(opts)
     if opts.get(b'edit') or opts.get(b'local') or opts.get(b'global'):
         if opts.get(b'local') and opts.get(b'global'):
             raise error.Abort(_(b"can't use --local and --global together"))
 
         if opts.get(b'local'):
             if not repo:
                 raise error.Abort(_(b"can't use --local outside a repository"))
             paths = [repo.vfs.join(b'hgrc')]
         elif opts.get(b'global'):
             paths = rcutil.systemrcpath()
         else:
             paths = rcutil.userrcpath()
 
         for f in paths:
             if os.path.exists(f):
                 break
         else:
             if opts.get(b'global'):
                 samplehgrc = uimod.samplehgrcs[b'global']
             elif opts.get(b'local'):
                 samplehgrc = uimod.samplehgrcs[b'local']
             else:
                 samplehgrc = uimod.samplehgrcs[b'user']
 
             f = paths[0]
             fp = open(f, b"wb")
             fp.write(util.tonativeeol(samplehgrc))
             fp.close()
 
         editor = ui.geteditor()
         ui.system(
             b"%s \"%s\"" % (editor, f),
             onerr=error.Abort,
             errprefix=_(b"edit failed"),
             blockedtag=b'config_edit',
         )
         return
     ui.pager(b'config')
     fm = ui.formatter(b'config', opts)
     for t, f in rcutil.rccomponents():
         if t == b'path':
             ui.debug(b'read config from: %s\n' % f)
         elif t == b'resource':
             ui.debug(b'read config from: resource:%s.%s\n' % (f[0], f[1]))
         elif t == b'items':
             # Don't print anything for 'items'.
             pass
         else:
             raise error.ProgrammingError(b'unknown rctype: %s' % t)
     untrusted = bool(opts.get(b'untrusted'))
 
     selsections = selentries = []
     if values:
         selsections = [v for v in values if b'.' not in v]
         selentries = [v for v in values if b'.' in v]
     uniquesel = len(selentries) == 1 and not selsections
     selsections = set(selsections)
     selentries = set(selentries)
 
     matched = False
     for section, name, value in ui.walkconfig(untrusted=untrusted):
         source = ui.configsource(section, name, untrusted)
         value = pycompat.bytestr(value)
         defaultvalue = ui.configdefault(section, name)
         if fm.isplain():
             source = source or b'none'
             value = value.replace(b'\n', b'\\n')
         entryname = section + b'.' + name
         if values and not (section in selsections or entryname in selentries):
             continue
         fm.startitem()
         fm.condwrite(ui.debugflag, b'source', b'%s: ', source)
         if uniquesel:
             fm.data(name=entryname)
             fm.write(b'value', b'%s\n', value)
         else:
             fm.write(b'name value', b'%s=%s\n', entryname, value)
         if formatter.isprintable(defaultvalue):
             fm.data(defaultvalue=defaultvalue)
         elif isinstance(defaultvalue, list) and all(
             formatter.isprintable(e) for e in defaultvalue
         ):
             fm.data(defaultvalue=fm.formatlist(defaultvalue, name=b'value'))
         # TODO: no idea how to process unsupported defaultvalue types
         matched = True
     fm.end()
     if matched:
         return 0
     return 1
 
 
 @command(
     b'continue',
     dryrunopts,
     helpcategory=command.CATEGORY_CHANGE_MANAGEMENT,
     helpbasic=True,
 )
 def continuecmd(ui, repo, **opts):
     """resumes an interrupted operation (EXPERIMENTAL)
 
     Finishes a multistep operation like graft, histedit, rebase, merge,
     and unshelve if they are in an interrupted state.
 
     use --dry-run/-n to dry run the command.
     """
     dryrun = opts.get('dry_run')
     contstate = cmdutil.getunfinishedstate(repo)
     if not contstate:
         raise error.Abort(_(b'no operation in progress'))
     if not contstate.continuefunc:
         raise error.Abort(
             (
                 _(b"%s in progress but does not support 'hg continue'")
                 % (contstate._opname)
             ),
             hint=contstate.continuemsg(),
         )
     if dryrun:
         ui.status(_(b'%s in progress, will be resumed\n') % (contstate._opname))
         return
     return contstate.continuefunc(ui, repo)
 
 
 @command(
     b'copy|cp',
     [
         (b'', b'forget', None, _(b'unmark a file as copied')),
         (b'A', b'after', None, _(b'record a copy that has already occurred')),
         (
             b'',
             b'at-rev',
             b'',
             _(b'(un)mark copies in the given revision (EXPERIMENTAL)'),
             _(b'REV'),
         ),
         (
             b'f',
             b'force',
             None,
             _(b'forcibly copy over an existing managed file'),
         ),
     ]
     + walkopts
     + dryrunopts,
     _(b'[OPTION]... SOURCE... DEST'),
     helpcategory=command.CATEGORY_FILE_CONTENTS,
 )
 def copy(ui, repo, *pats, **opts):
     """mark files as copied for the next commit
 
     Mark dest as having copies of source files. If dest is a
     directory, copies are put in that directory. If dest is a file,
     the source must be a single file.
 
     By default, this command copies the contents of files as they
     exist in the working directory. If invoked with -A/--after, the
     operation is recorded, but no copying is performed.
 
     To undo marking a file as copied, use --forget. With that option,
     all given (positional) arguments are unmarked as copies. The destination
     file(s) will be left in place (still tracked).
 
     This command takes effect with the next commit by default.
 
     Returns 0 on success, 1 if errors are encountered.
     """
     opts = pycompat.byteskwargs(opts)
     with repo.wlock(False):
         return cmdutil.copy(ui, repo, pats, opts)
 
 
 @command(
     b'debugcommands',
     [],
     _(b'[COMMAND]'),
     helpcategory=command.CATEGORY_HELP,
     norepo=True,
 )
 def debugcommands(ui, cmd=b'', *args):
     """list all available commands and options"""
     for cmd, vals in sorted(pycompat.iteritems(table)):
         cmd = cmd.split(b'|')[0]
         opts = b', '.join([i[1] for i in vals[1]])
         ui.write(b'%s: %s\n' % (cmd, opts))
 
 
 @command(
     b'debugcomplete',
     [(b'o', b'options', None, _(b'show the command options'))],
     _(b'[-o] CMD'),
     helpcategory=command.CATEGORY_HELP,
     norepo=True,
 )
 def debugcomplete(ui, cmd=b'', **opts):
     """returns the completion list associated with the given command"""
 
     if opts.get('options'):
         options = []
         otables = [globalopts]
         if cmd:
             aliases, entry = cmdutil.findcmd(cmd, table, False)
             otables.append(entry[1])
         for t in otables:
             for o in t:
                 if b"(DEPRECATED)" in o[3]:
                     continue
                 if o[0]:
                     options.append(b'-%s' % o[0])
                 options.append(b'--%s' % o[1])
         ui.write(b"%s\n" % b"\n".join(options))
         return
 
     cmdlist, unused_allcmds = cmdutil.findpossible(cmd, table)
     if ui.verbose:
         cmdlist = [b' '.join(c[0]) for c in cmdlist.values()]
     ui.write(b"%s\n" % b"\n".join(sorted(cmdlist)))
 
 
 @command(
     b'diff',
     [
         (b'r', b'rev', [], _(b'revision'), _(b'REV')),
         (b'c', b'change', b'', _(b'change made by revision'), _(b'REV')),
     ]
     + diffopts
     + diffopts2
     + walkopts
     + subrepoopts,
     _(b'[OPTION]... ([-c REV] | [-r REV1 [-r REV2]]) [FILE]...'),
     helpcategory=command.CATEGORY_FILE_CONTENTS,
     helpbasic=True,
     inferrepo=True,
     intents={INTENT_READONLY},
 )
 def diff(ui, repo, *pats, **opts):
     """diff repository (or selected files)
 
     Show differences between revisions for the specified files.
 
     Differences between files are shown using the unified diff format.
 
     .. note::
 
        :hg:`diff` may generate unexpected results for merges, as it will
        default to comparing against the working directory's first
        parent changeset if no revisions are specified.
 
     When two revision arguments are given, then changes are shown
     between those revisions. If only one revision is specified then
     that revision is compared to the working directory, and, when no
     revisions are specified, the working directory files are compared
     to its first parent.
 
     Alternatively you can specify -c/--change with a revision to see
     the changes in that changeset relative to its first parent.
 
     Without the -a/--text option, diff will avoid generating diffs of
     files it detects as binary. With -a, diff will generate a diff
     anyway, probably with undesirable results.
 
     Use the -g/--git option to generate diffs in the git extended diff
     format. For more information, read :hg:`help diffs`.
 
     .. container:: verbose
 
       Examples:
 
       - compare a file in the current working directory to its parent::
 
           hg diff foo.c
 
       - compare two historical versions of a directory, with rename info::
 
           hg diff --git -r 1.0:1.2 lib/
 
       - get change stats relative to the last change on some date::
 
           hg diff --stat -r "date('may 2')"
 
       - diff all newly-added files that contain a keyword::
 
           hg diff "set:added() and grep(GNU)"
 
       - compare a revision and its parents::
 
           hg diff -c 9353         # compare against first parent
           hg diff -r 9353^:9353   # same using revset syntax
           hg diff -r 9353^2:9353  # compare against the second parent
 
     Returns 0 on success.
     """
 
     opts = pycompat.byteskwargs(opts)
     revs = opts.get(b'rev')
     change = opts.get(b'change')
     stat = opts.get(b'stat')
     reverse = opts.get(b'reverse')
 
     if revs and change:
         msg = _(b'cannot specify --rev and --change at the same time')
         raise error.Abort(msg)
     elif change:
         repo = scmutil.unhidehashlikerevs(repo, [change], b'nowarn')
         ctx2 = scmutil.revsingle(repo, change, None)
         ctx1 = ctx2.p1()
     else:
         repo = scmutil.unhidehashlikerevs(repo, revs, b'nowarn')
         ctx1, ctx2 = scmutil.revpair(repo, revs)
     node1, node2 = ctx1.node(), ctx2.node()
 
     if reverse:
         node1, node2 = node2, node1
 
     diffopts = patch.diffallopts(ui, opts)
     m = scmutil.match(ctx2, pats, opts)
     m = repo.narrowmatch(m)
     ui.pager(b'diff')
     logcmdutil.diffordiffstat(
         ui,
         repo,
         diffopts,
         node1,
         node2,
         m,
         stat=stat,
         listsubrepos=opts.get(b'subrepos'),
         root=opts.get(b'root'),
     )
 
 
 @command(
     b'export',
     [
         (
             b'B',
             b'bookmark',
             b'',
             _(b'export changes only reachable by given bookmark'),
             _(b'BOOKMARK'),
         ),
         (
             b'o',
             b'output',
             b'',
             _(b'print output to file with formatted name'),
             _(b'FORMAT'),
         ),
         (b'', b'switch-parent', None, _(b'diff against the second parent')),
         (b'r', b'rev', [], _(b'revisions to export'), _(b'REV')),
     ]
     + diffopts
     + formatteropts,
     _(b'[OPTION]... [-o OUTFILESPEC] [-r] [REV]...'),
     helpcategory=command.CATEGORY_IMPORT_EXPORT,
     helpbasic=True,
     intents={INTENT_READONLY},
 )
 def export(ui, repo, *changesets, **opts):
     """dump the header and diffs for one or more changesets
 
     Print the changeset header and diffs for one or more revisions.
     If no revision is given, the parent of the working directory is used.
 
     The information shown in the changeset header is: author, date,
     branch name (if non-default), changeset hash, parent(s) and commit
     comment.
 
     .. note::
 
        :hg:`export` may generate unexpected diff output for merge
        changesets, as it will compare the merge changeset against its
        first parent only.
 
     Output may be to a file, in which case the name of the file is
     given using a template string. See :hg:`help templates`. In addition
     to the common template keywords, the following formatting rules are
     supported:
 
     :``%%``: literal "%" character
     :``%H``: changeset hash (40 hexadecimal digits)
     :``%N``: number of patches being generated
     :``%R``: changeset revision number
     :``%b``: basename of the exporting repository
     :``%h``: short-form changeset hash (12 hexadecimal digits)
     :``%m``: first line of the commit message (only alphanumeric characters)
     :``%n``: zero-padded sequence number, starting at 1
     :``%r``: zero-padded changeset revision number
     :``\\``: literal "\\" character
 
     Without the -a/--text option, export will avoid generating diffs
     of files it detects as binary. With -a, export will generate a
     diff anyway, probably with undesirable results.
 
     With -B/--bookmark changesets reachable by the given bookmark are
     selected.
 
     Use the -g/--git option to generate diffs in the git extended diff
     format. See :hg:`help diffs` for more information.
 
     With the --switch-parent option, the diff will be against the
     second parent. It can be useful to review a merge.
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported in addition to the common template
       keywords and functions. See also :hg:`help templates`.
 
       :diff:    String. Diff content.
       :parents: List of strings. Parent nodes of the changeset.
 
       Examples:
 
       - use export and import to transplant a bugfix to the current
         branch::
 
           hg export -r 9353 | hg import -
 
       - export all the changesets between two revisions to a file with
         rename information::
 
           hg export --git -r 123:150 > changes.txt
 
       - split outgoing changes into a series of patches with
         descriptive names::
 
           hg export -r "outgoing()" -o "%n-%m.patch"
 
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
     bookmark = opts.get(b'bookmark')
     changesets += tuple(opts.get(b'rev', []))
 
     cmdutil.check_at_most_one_arg(opts, b'rev', b'bookmark')
 
     if bookmark:
         if bookmark not in repo._bookmarks:
             raise error.Abort(_(b"bookmark '%s' not found") % bookmark)
 
         revs = scmutil.bookmarkrevs(repo, bookmark)
     else:
         if not changesets:
             changesets = [b'.']
 
         repo = scmutil.unhidehashlikerevs(repo, changesets, b'nowarn')
         revs = scmutil.revrange(repo, changesets)
 
     if not revs:
         raise error.Abort(_(b"export requires at least one changeset"))
     if len(revs) > 1:
         ui.note(_(b'exporting patches:\n'))
     else:
         ui.note(_(b'exporting patch:\n'))
 
     fntemplate = opts.get(b'output')
     if cmdutil.isstdiofilename(fntemplate):
         fntemplate = b''
 
     if fntemplate:
         fm = formatter.nullformatter(ui, b'export', opts)
     else:
         ui.pager(b'export')
         fm = ui.formatter(b'export', opts)
     with fm:
         cmdutil.export(
             repo,
             revs,
             fm,
             fntemplate=fntemplate,
             switch_parent=opts.get(b'switch_parent'),
             opts=patch.diffallopts(ui, opts),
         )
 
 
 @command(
     b'files',
     [
         (
             b'r',
             b'rev',
             b'',
             _(b'search the repository as it is in REV'),
             _(b'REV'),
         ),
         (
             b'0',
             b'print0',
             None,
             _(b'end filenames with NUL, for use with xargs'),
         ),
     ]
     + walkopts
     + formatteropts
     + subrepoopts,
     _(b'[OPTION]... [FILE]...'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
     intents={INTENT_READONLY},
 )
 def files(ui, repo, *pats, **opts):
     """list tracked files
 
     Print files under Mercurial control in the working directory or
     specified revision for given files (excluding removed files).
     Files can be specified as filenames or filesets.
 
     If no files are given to match, this command prints the names
     of all files under Mercurial control.
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported in addition to the common template
       keywords and functions. See also :hg:`help templates`.
 
       :flags:   String. Character denoting file's symlink and executable bits.
       :path:    String. Repository-absolute path of the file.
       :size:    Integer. Size of the file in bytes.
 
       Examples:
 
       - list all files under the current directory::
 
           hg files .
 
       - shows sizes and flags for current revision::
 
           hg files -vr .
 
       - list all files named README::
 
           hg files -I "**/README"
 
       - list all binary files::
 
           hg files "set:binary()"
 
       - find files containing a regular expression::
 
           hg files "set:grep('bob')"
 
       - search tracked file contents with xargs and grep::
 
           hg files -0 | xargs -0 grep foo
 
     See :hg:`help patterns` and :hg:`help filesets` for more information
     on specifying file patterns.
 
     Returns 0 if a match is found, 1 otherwise.
 
     """
 
     opts = pycompat.byteskwargs(opts)
     rev = opts.get(b'rev')
     if rev:
         repo = scmutil.unhidehashlikerevs(repo, [rev], b'nowarn')
     ctx = scmutil.revsingle(repo, rev, None)
 
     end = b'\n'
     if opts.get(b'print0'):
         end = b'\0'
     fmt = b'%s' + end
 
     m = scmutil.match(ctx, pats, opts)
     ui.pager(b'files')
     uipathfn = scmutil.getuipathfn(ctx.repo(), legacyrelativevalue=True)
     with ui.formatter(b'files', opts) as fm:
         return cmdutil.files(
             ui, ctx, m, uipathfn, fm, fmt, opts.get(b'subrepos')
         )
 
 
 @command(
     b'forget',
     [(b'i', b'interactive', None, _(b'use interactive mode')),]
     + walkopts
     + dryrunopts,
     _(b'[OPTION]... FILE...'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
     helpbasic=True,
     inferrepo=True,
 )
 def forget(ui, repo, *pats, **opts):
     """forget the specified files on the next commit
 
     Mark the specified files so they will no longer be tracked
     after the next commit.
 
     This only removes files from the current branch, not from the
     entire project history, and it does not delete them from the
     working directory.
 
     To delete the file from the working directory, see :hg:`remove`.
 
     To undo a forget before the next commit, see :hg:`add`.
 
     .. container:: verbose
 
       Examples:
 
       - forget newly-added binary files::
 
           hg forget "set:added() and binary()"
 
       - forget files that would be excluded by .hgignore::
 
           hg forget "set:hgignore()"
 
     Returns 0 on success.
     """
 
     opts = pycompat.byteskwargs(opts)
     if not pats:
         raise error.Abort(_(b'no files specified'))
 
     m = scmutil.match(repo[None], pats, opts)
     dryrun, interactive = opts.get(b'dry_run'), opts.get(b'interactive')
     uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True)
     rejected = cmdutil.forget(
         ui,
         repo,
         m,
         prefix=b"",
         uipathfn=uipathfn,
         explicitonly=False,
         dryrun=dryrun,
         interactive=interactive,
     )[0]
     return rejected and 1 or 0
 
 
 @command(
     b'graft',
     [
         (b'r', b'rev', [], _(b'revisions to graft'), _(b'REV')),
         (
             b'',
             b'base',
             b'',
             _(b'base revision when doing the graft merge (ADVANCED)'),
             _(b'REV'),
         ),
         (b'c', b'continue', False, _(b'resume interrupted graft')),
         (b'', b'stop', False, _(b'stop interrupted graft')),
         (b'', b'abort', False, _(b'abort interrupted graft')),
         (b'e', b'edit', False, _(b'invoke editor on commit messages')),
         (b'', b'log', None, _(b'append graft info to log message')),
         (
             b'',
             b'no-commit',
             None,
             _(b"don't commit, just apply the changes in working directory"),
         ),
         (b'f', b'force', False, _(b'force graft')),
         (
             b'D',
             b'currentdate',
             False,
             _(b'record the current date as commit date'),
         ),
         (
             b'U',
             b'currentuser',
             False,
             _(b'record the current user as committer'),
         ),
     ]
     + commitopts2
     + mergetoolopts
     + dryrunopts,
     _(b'[OPTION]... [-r REV]... REV...'),
     helpcategory=command.CATEGORY_CHANGE_MANAGEMENT,
 )
 def graft(ui, repo, *revs, **opts):
     '''copy changes from other branches onto the current branch
 
     This command uses Mercurial's merge logic to copy individual
     changes from other branches without merging branches in the
     history graph. This is sometimes known as 'backporting' or
     'cherry-picking'. By default, graft will copy user, date, and
     description from the source changesets.
 
     Changesets that are ancestors of the current revision, that have
     already been grafted, or that are merges will be skipped.
 
     If --log is specified, log messages will have a comment appended
     of the form::
 
       (grafted from CHANGESETHASH)
 
     If --force is specified, revisions will be grafted even if they
     are already ancestors of, or have been grafted to, the destination.
     This is useful when the revisions have since been backed out.
 
     If a graft merge results in conflicts, the graft process is
     interrupted so that the current merge can be manually resolved.
     Once all conflicts are addressed, the graft process can be
     continued with the -c/--continue option.
 
     The -c/--continue option reapplies all the earlier options.
 
     .. container:: verbose
 
       The --base option exposes more of how graft internally uses merge with a
       custom base revision. --base can be used to specify another ancestor than
       the first and only parent.
 
       The command::
 
         hg graft -r 345 --base 234
 
       is thus pretty much the same as::
 
         hg diff -r 234 -r 345 | hg import
 
       but using merge to resolve conflicts and track moved files.
 
       The result of a merge can thus be backported as a single commit by
       specifying one of the merge parents as base, and thus effectively
       grafting the changes from the other side.
 
       It is also possible to collapse multiple changesets and clean up history
       by specifying another ancestor as base, much like rebase --collapse
       --keep.
 
       The commit message can be tweaked after the fact using commit --amend .
 
       For using non-ancestors as the base to backout changes, see the backout
       command and the hidden --parent option.
 
     .. container:: verbose
 
       Examples:
 
       - copy a single change to the stable branch and edit its description::
 
           hg update stable
           hg graft --edit 9393
 
       - graft a range of changesets with one exception, updating dates::
 
           hg graft -D "2085::2093 and not 2091"
 
       - continue a graft after resolving conflicts::
 
           hg graft -c
 
       - show the source of a grafted changeset::
 
           hg log --debug -r .
 
       - show revisions sorted by date::
 
           hg log -r "sort(all(), date)"
 
       - backport the result of a merge as a single commit::
 
           hg graft -r 123 --base 123^
 
       - land a feature branch as one changeset::
 
           hg up -cr default
           hg graft -r featureX --base "ancestor('featureX', 'default')"
 
     See :hg:`help revisions` for more about specifying revisions.
 
     Returns 0 on successful completion.
     '''
     with repo.wlock():
         return _dograft(ui, repo, *revs, **opts)
 
 
 def _dograft(ui, repo, *revs, **opts):
     opts = pycompat.byteskwargs(opts)
     if revs and opts.get(b'rev'):
         ui.warn(
             _(
                 b'warning: inconsistent use of --rev might give unexpected '
                 b'revision ordering!\n'
             )
         )
 
     revs = list(revs)
     revs.extend(opts.get(b'rev'))
     basectx = None
     if opts.get(b'base'):
         basectx = scmutil.revsingle(repo, opts[b'base'], None)
     # a dict of data to be stored in state file
     statedata = {}
     # list of new nodes created by ongoing graft
     statedata[b'newnodes'] = []
 
     cmdutil.resolvecommitoptions(ui, opts)
 
     editor = cmdutil.getcommiteditor(
         editform=b'graft', **pycompat.strkwargs(opts)
     )
 
     cont = False
     if opts.get(b'no_commit'):
         if opts.get(b'edit'):
             raise error.Abort(
                 _(b"cannot specify --no-commit and --edit together")
             )
         if opts.get(b'currentuser'):
             raise error.Abort(
                 _(b"cannot specify --no-commit and --currentuser together")
             )
         if opts.get(b'currentdate'):
             raise error.Abort(
                 _(b"cannot specify --no-commit and --currentdate together")
             )
         if opts.get(b'log'):
             raise error.Abort(
                 _(b"cannot specify --no-commit and --log together")
             )
 
     graftstate = statemod.cmdstate(repo, b'graftstate')
 
     if opts.get(b'stop'):
         if opts.get(b'continue'):
             raise error.Abort(
                 _(b"cannot use '--continue' and '--stop' together")
             )
         if opts.get(b'abort'):
             raise error.Abort(_(b"cannot use '--abort' and '--stop' together"))
 
         if any(
             (
                 opts.get(b'edit'),
                 opts.get(b'log'),
                 opts.get(b'user'),
                 opts.get(b'date'),
                 opts.get(b'currentdate'),
                 opts.get(b'currentuser'),
                 opts.get(b'rev'),
             )
         ):
             raise error.Abort(_(b"cannot specify any other flag with '--stop'"))
         return _stopgraft(ui, repo, graftstate)
     elif opts.get(b'abort'):
         if opts.get(b'continue'):
             raise error.Abort(
                 _(b"cannot use '--continue' and '--abort' together")
             )
         if any(
             (
                 opts.get(b'edit'),
                 opts.get(b'log'),
                 opts.get(b'user'),
                 opts.get(b'date'),
                 opts.get(b'currentdate'),
                 opts.get(b'currentuser'),
                 opts.get(b'rev'),
             )
         ):
             raise error.Abort(
                 _(b"cannot specify any other flag with '--abort'")
             )
 
         return cmdutil.abortgraft(ui, repo, graftstate)
     elif opts.get(b'continue'):
         cont = True
         if revs:
             raise error.Abort(_(b"can't specify --continue and revisions"))
         # read in unfinished revisions
         if graftstate.exists():
             statedata = cmdutil.readgraftstate(repo, graftstate)
             if statedata.get(b'date'):
                 opts[b'date'] = statedata[b'date']
             if statedata.get(b'user'):
                 opts[b'user'] = statedata[b'user']
             if statedata.get(b'log'):
                 opts[b'log'] = True
             if statedata.get(b'no_commit'):
                 opts[b'no_commit'] = statedata.get(b'no_commit')
             nodes = statedata[b'nodes']
             revs = [repo[node].rev() for node in nodes]
         else:
             cmdutil.wrongtooltocontinue(repo, _(b'graft'))
     else:
         if not revs:
             raise error.Abort(_(b'no revisions specified'))
         cmdutil.checkunfinished(repo)
         cmdutil.bailifchanged(repo)
         revs = scmutil.revrange(repo, revs)
 
     skipped = set()
     if basectx is None:
         # check for merges
         for rev in repo.revs(b'%ld and merge()', revs):
             ui.warn(_(b'skipping ungraftable merge revision %d\n') % rev)
             skipped.add(rev)
     revs = [r for r in revs if r not in skipped]
     if not revs:
         return -1
     if basectx is not None and len(revs) != 1:
         raise error.Abort(_(b'only one revision allowed with --base '))
 
     # Don't check in the --continue case, in effect retaining --force across
     # --continues. That's because without --force, any revisions we decided to
     # skip would have been filtered out here, so they wouldn't have made their
     # way to the graftstate. With --force, any revisions we would have otherwise
     # skipped would not have been filtered out, and if they hadn't been applied
     # already, they'd have been in the graftstate.
     if not (cont or opts.get(b'force')) and basectx is None:
         # check for ancestors of dest branch
         ancestors = repo.revs(b'%ld & (::.)', revs)
         for rev in ancestors:
             ui.warn(_(b'skipping ancestor revision %d:%s\n') % (rev, repo[rev]))
 
         revs = [r for r in revs if r not in ancestors]
 
         if not revs:
             return -1
 
         # analyze revs for earlier grafts
         ids = {}
         for ctx in repo.set(b"%ld", revs):
             ids[ctx.hex()] = ctx.rev()
             n = ctx.extra().get(b'source')
             if n:
                 ids[n] = ctx.rev()
 
         # check ancestors for earlier grafts
         ui.debug(b'scanning for duplicate grafts\n')
 
         # The only changesets we can be sure doesn't contain grafts of any
         # revs, are the ones that are common ancestors of *all* revs:
         for rev in repo.revs(b'only(%d,ancestor(%ld))', repo[b'.'].rev(), revs):
             ctx = repo[rev]
             n = ctx.extra().get(b'source')
             if n in ids:
                 try:
                     r = repo[n].rev()
                 except error.RepoLookupError:
                     r = None
                 if r in revs:
                     ui.warn(
                         _(
                             b'skipping revision %d:%s '
                             b'(already grafted to %d:%s)\n'
                         )
                         % (r, repo[r], rev, ctx)
                     )
                     revs.remove(r)
                 elif ids[n] in revs:
                     if r is None:
                         ui.warn(
                             _(
                                 b'skipping already grafted revision %d:%s '
                                 b'(%d:%s also has unknown origin %s)\n'
                             )
                             % (ids[n], repo[ids[n]], rev, ctx, n[:12])
                         )
                     else:
                         ui.warn(
                             _(
                                 b'skipping already grafted revision %d:%s '
                                 b'(%d:%s also has origin %d:%s)\n'
                             )
                             % (ids[n], repo[ids[n]], rev, ctx, r, n[:12])
                         )
                     revs.remove(ids[n])
             elif ctx.hex() in ids:
                 r = ids[ctx.hex()]
                 if r in revs:
                     ui.warn(
                         _(
                             b'skipping already grafted revision %d:%s '
                             b'(was grafted from %d:%s)\n'
                         )
                         % (r, repo[r], rev, ctx)
                     )
                     revs.remove(r)
         if not revs:
             return -1
 
     if opts.get(b'no_commit'):
         statedata[b'no_commit'] = True
     for pos, ctx in enumerate(repo.set(b"%ld", revs)):
         desc = b'%d:%s "%s"' % (
             ctx.rev(),
             ctx,
             ctx.description().split(b'\n', 1)[0],
         )
         names = repo.nodetags(ctx.node()) + repo.nodebookmarks(ctx.node())
         if names:
             desc += b' (%s)' % b' '.join(names)
         ui.status(_(b'grafting %s\n') % desc)
         if opts.get(b'dry_run'):
             continue
 
         source = ctx.extra().get(b'source')
         extra = {}
         if source:
             extra[b'source'] = source
             extra[b'intermediate-source'] = ctx.hex()
         else:
             extra[b'source'] = ctx.hex()
         user = ctx.user()
         if opts.get(b'user'):
             user = opts[b'user']
             statedata[b'user'] = user
         date = ctx.date()
         if opts.get(b'date'):
             date = opts[b'date']
             statedata[b'date'] = date
         message = ctx.description()
         if opts.get(b'log'):
             message += b'\n(grafted from %s)' % ctx.hex()
             statedata[b'log'] = True
 
         # we don't merge the first commit when continuing
         if not cont:
             # perform the graft merge with p1(rev) as 'ancestor'
             overrides = {(b'ui', b'forcemerge'): opts.get(b'tool', b'')}
             base = ctx.p1() if basectx is None else basectx
             with ui.configoverride(overrides, b'graft'):
                 stats = mergemod.graft(repo, ctx, base, [b'local', b'graft'])
             # report any conflicts
             if stats.unresolvedcount > 0:
                 # write out state for --continue
                 nodes = [repo[rev].hex() for rev in revs[pos:]]
                 statedata[b'nodes'] = nodes
                 stateversion = 1
                 graftstate.save(stateversion, statedata)
                 hint = _(b"use 'hg resolve' and 'hg graft --continue'")
                 raise error.Abort(
                     _(b"unresolved conflicts, can't continue"), hint=hint
                 )
         else:
             cont = False
 
         # commit if --no-commit is false
         if not opts.get(b'no_commit'):
             node = repo.commit(
                 text=message, user=user, date=date, extra=extra, editor=editor
             )
             if node is None:
                 ui.warn(
                     _(b'note: graft of %d:%s created no changes to commit\n')
                     % (ctx.rev(), ctx)
                 )
             # checking that newnodes exist because old state files won't have it
             elif statedata.get(b'newnodes') is not None:
                 statedata[b'newnodes'].append(node)
 
     # remove state when we complete successfully
     if not opts.get(b'dry_run'):
         graftstate.delete()
 
     return 0
 
 
 def _stopgraft(ui, repo, graftstate):
     """stop the interrupted graft"""
     if not graftstate.exists():
         raise error.Abort(_(b"no interrupted graft found"))
     pctx = repo[b'.']
     hg.updaterepo(repo, pctx.node(), overwrite=True)
     graftstate.delete()
     ui.status(_(b"stopped the interrupted graft\n"))
     ui.status(_(b"working directory is now at %s\n") % pctx.hex()[:12])
     return 0
 
 
 statemod.addunfinished(
     b'graft',
     fname=b'graftstate',
     clearable=True,
     stopflag=True,
     continueflag=True,
     abortfunc=cmdutil.hgabortgraft,
     cmdhint=_(b"use 'hg graft --continue' or 'hg graft --stop' to stop"),
 )
 
 
 @command(
     b'grep',
     [
         (b'0', b'print0', None, _(b'end fields with NUL')),
         (b'', b'all', None, _(b'print all revisions that match (DEPRECATED) ')),
         (
             b'',
             b'diff',
             None,
             _(
                 b'search revision differences for when the pattern was added '
                 b'or removed'
             ),
         ),
         (b'a', b'text', None, _(b'treat all files as text')),
         (
             b'f',
             b'follow',
             None,
             _(
                 b'follow changeset history,'
                 b' or file history across copies and renames'
             ),
         ),
         (b'i', b'ignore-case', None, _(b'ignore case when matching')),
         (
             b'l',
             b'files-with-matches',
             None,
             _(b'print only filenames and revisions that match'),
         ),
         (b'n', b'line-number', None, _(b'print matching line numbers')),
         (
             b'r',
             b'rev',
             [],
             _(b'search files changed within revision range'),
             _(b'REV'),
         ),
         (
             b'',
             b'all-files',
             None,
             _(
                 b'include all files in the changeset while grepping (DEPRECATED)'
             ),
         ),
         (b'u', b'user', None, _(b'list the author (long with -v)')),
         (b'd', b'date', None, _(b'list the date (short with -q)')),
     ]
     + formatteropts
     + walkopts,
     _(b'[--diff] [OPTION]... PATTERN [FILE]...'),
     helpcategory=command.CATEGORY_FILE_CONTENTS,
     inferrepo=True,
     intents={INTENT_READONLY},
 )
 def grep(ui, repo, pattern, *pats, **opts):
     """search for a pattern in specified files
 
     Search the working directory or revision history for a regular
     expression in the specified files for the entire repository.
 
     By default, grep searches the repository files in the working
     directory and prints the files where it finds a match. To specify
     historical revisions instead of the working directory, use the
     --rev flag.
 
     To search instead historical revision differences that contains a
     change in match status ("-" for a match that becomes a non-match,
     or "+" for a non-match that becomes a match), use the --diff flag.
 
     PATTERN can be any Python (roughly Perl-compatible) regular
     expression.
 
     If no FILEs are specified and the --rev flag isn't supplied, all
     files in the working directory are searched. When using the --rev
     flag and specifying FILEs, use the --follow argument to also
     follow the specified FILEs across renames and copies.
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported in addition to the common template
       keywords and functions. See also :hg:`help templates`.
 
       :change:  String. Character denoting insertion ``+`` or removal ``-``.
                 Available if ``--diff`` is specified.
       :lineno:  Integer. Line number of the match.
       :path:    String. Repository-absolute path of the file.
       :texts:   List of text chunks.
 
       And each entry of ``{texts}`` provides the following sub-keywords.
 
       :matched: Boolean. True if the chunk matches the specified pattern.
       :text:    String. Chunk content.
 
       See :hg:`help templates.operators` for the list expansion syntax.
 
     Returns 0 if a match is found, 1 otherwise.
 
     """
     opts = pycompat.byteskwargs(opts)
     diff = opts.get(b'all') or opts.get(b'diff')
     if diff and opts.get(b'all_files'):
         raise error.Abort(_(b'--diff and --all-files are mutually exclusive'))
     if opts.get(b'all_files') is None and not diff:
         opts[b'all_files'] = True
     plaingrep = opts.get(b'all_files') and not opts.get(b'rev')
     all_files = opts.get(b'all_files')
     if plaingrep:
         opts[b'rev'] = [b'wdir()']
 
     reflags = re.M
     if opts.get(b'ignore_case'):
         reflags |= re.I
     try:
         regexp = util.re.compile(pattern, reflags)
     except re.error as inst:
         ui.warn(
             _(b"grep: invalid match pattern: %s\n") % pycompat.bytestr(inst)
         )
         return 1
     sep, eol = b':', b'\n'
     if opts.get(b'print0'):
         sep = eol = b'\0'
 
     getfile = util.lrucachefunc(repo.file)
 
     def matchlines(body):
         begin = 0
         linenum = 0
         while begin < len(body):
             match = regexp.search(body, begin)
             if not match:
                 break
             mstart, mend = match.span()
             linenum += body.count(b'\n', begin, mstart) + 1
             lstart = body.rfind(b'\n', begin, mstart) + 1 or begin
             begin = body.find(b'\n', mend) + 1 or len(body) + 1
             lend = begin - 1
             yield linenum, mstart - lstart, mend - lstart, body[lstart:lend]
 
     class linestate(object):
         def __init__(self, line, linenum, colstart, colend):
             self.line = line
             self.linenum = linenum
             self.colstart = colstart
             self.colend = colend
 
         def __hash__(self):
             return hash((self.linenum, self.line))
 
         def __eq__(self, other):
             return self.line == other.line
 
         def findpos(self):
             """Iterate all (start, end) indices of matches"""
             yield self.colstart, self.colend
             p = self.colend
             while p < len(self.line):
                 m = regexp.search(self.line, p)
                 if not m:
                     break
                 yield m.span()
                 p = m.end()
 
     matches = {}
     copies = {}
 
     def grepbody(fn, rev, body):
         matches[rev].setdefault(fn, [])
         m = matches[rev][fn]
         if body is None:
             return
 
         for lnum, cstart, cend, line in matchlines(body):
             s = linestate(line, lnum, cstart, cend)
             m.append(s)
 
     def difflinestates(a, b):
         sm = difflib.SequenceMatcher(None, a, b)
         for tag, alo, ahi, blo, bhi in sm.get_opcodes():
             if tag == 'insert':
                 for i in pycompat.xrange(blo, bhi):
                     yield (b'+', b[i])
             elif tag == 'delete':
                 for i in pycompat.xrange(alo, ahi):
                     yield (b'-', a[i])
             elif tag == 'replace':
                 for i in pycompat.xrange(alo, ahi):
                     yield (b'-', a[i])
                 for i in pycompat.xrange(blo, bhi):
                     yield (b'+', b[i])
 
     uipathfn = scmutil.getuipathfn(repo)
 
     def display(fm, fn, ctx, pstates, states):
         rev = scmutil.intrev(ctx)
         if fm.isplain():
             formatuser = ui.shortuser
         else:
             formatuser = pycompat.bytestr
         if ui.quiet:
             datefmt = b'%Y-%m-%d'
         else:
             datefmt = b'%a %b %d %H:%M:%S %Y %1%2'
         found = False
 
         @util.cachefunc
         def binary():
             flog = getfile(fn)
             try:
                 return stringutil.binary(flog.read(ctx.filenode(fn)))
             except error.WdirUnsupported:
                 return ctx[fn].isbinary()
 
         fieldnamemap = {b'linenumber': b'lineno'}
         if diff:
             iter = difflinestates(pstates, states)
         else:
             iter = [(b'', l) for l in states]
         for change, l in iter:
             fm.startitem()
             fm.context(ctx=ctx)
             fm.data(node=fm.hexfunc(scmutil.binnode(ctx)), path=fn)
             fm.plain(uipathfn(fn), label=b'grep.filename')
 
             cols = [
                 (b'rev', b'%d', rev, not plaingrep, b''),
                 (
                     b'linenumber',
                     b'%d',
                     l.linenum,
                     opts.get(b'line_number'),
                     b'',
                 ),
             ]
             if diff:
                 cols.append(
                     (
                         b'change',
                         b'%s',
                         change,
                         True,
                         b'grep.inserted '
                         if change == b'+'
                         else b'grep.deleted ',
                     )
                 )
             cols.extend(
                 [
                     (
                         b'user',
                         b'%s',
                         formatuser(ctx.user()),
                         opts.get(b'user'),
                         b'',
                     ),
                     (
                         b'date',
                         b'%s',
                         fm.formatdate(ctx.date(), datefmt),
                         opts.get(b'date'),
                         b'',
                     ),
                 ]
             )
             for name, fmt, data, cond, extra_label in cols:
                 if cond:
                     fm.plain(sep, label=b'grep.sep')
                 field = fieldnamemap.get(name, name)
                 label = extra_label + (b'grep.%s' % name)
                 fm.condwrite(cond, field, fmt, data, label=label)
             if not opts.get(b'files_with_matches'):
                 fm.plain(sep, label=b'grep.sep')
                 if not opts.get(b'text') and binary():
                     fm.plain(_(b" Binary file matches"))
                 else:
                     displaymatches(fm.nested(b'texts', tmpl=b'{text}'), l)
             fm.plain(eol)
             found = True
             if opts.get(b'files_with_matches'):
                 break
         return found
 
     def displaymatches(fm, l):
         p = 0
         for s, e in l.findpos():
             if p < s:
                 fm.startitem()
                 fm.write(b'text', b'%s', l.line[p:s])
                 fm.data(matched=False)
             fm.startitem()
             fm.write(b'text', b'%s', l.line[s:e], label=b'grep.match')
             fm.data(matched=True)
             p = e
         if p < len(l.line):
             fm.startitem()
             fm.write(b'text', b'%s', l.line[p:])
             fm.data(matched=False)
         fm.end()
 
     skip = set()
     revfiles = {}
     match = scmutil.match(repo[None], pats, opts)
     found = False
     follow = opts.get(b'follow')
 
     getrenamed = scmutil.getrenamedfn(repo)
 
     def get_file_content(filename, filelog, filenode, context, revision):
         try:
             content = filelog.read(filenode)
         except error.WdirUnsupported:
             content = context[filename].data()
         except error.CensoredNodeError:
             content = None
             ui.warn(
                 _(b'cannot search in censored file: %(filename)s:%(revnum)s\n')
                 % {b'filename': filename, b'revnum': pycompat.bytestr(revision)}
             )
         return content
 
     def prep(ctx, fns):
         rev = ctx.rev()
         pctx = ctx.p1()
         parent = pctx.rev()
         matches.setdefault(rev, {})
         matches.setdefault(parent, {})
         files = revfiles.setdefault(rev, [])
         for fn in fns:
             flog = getfile(fn)
             try:
                 fnode = ctx.filenode(fn)
             except error.LookupError:
                 continue
 
             copy = None
             if follow:
                 copy = getrenamed(fn, rev)
                 if copy:
                     copies.setdefault(rev, {})[fn] = copy
                     if fn in skip:
                         skip.add(copy)
             if fn in skip:
                 continue
             files.append(fn)
 
             if fn not in matches[rev]:
                 content = get_file_content(fn, flog, fnode, ctx, rev)
                 grepbody(fn, rev, content)
 
             pfn = copy or fn
             if pfn not in matches[parent]:
                 try:
                     pfnode = pctx.filenode(pfn)
                     pcontent = get_file_content(pfn, flog, pfnode, pctx, parent)
                     grepbody(pfn, parent, pcontent)
                 except error.LookupError:
                     pass
 
     ui.pager(b'grep')
     fm = ui.formatter(b'grep', opts)
     for ctx in cmdutil.walkchangerevs(repo, match, opts, prep):
         rev = ctx.rev()
         parent = ctx.p1().rev()
         for fn in sorted(revfiles.get(rev, [])):
             states = matches[rev][fn]
             copy = copies.get(rev, {}).get(fn)
             if fn in skip:
                 if copy:
                     skip.add(copy)
                 continue
             pstates = matches.get(parent, {}).get(copy or fn, [])
             if pstates or states:
                 r = display(fm, fn, ctx, pstates, states)
                 found = found or r
                 if r and not diff and not all_files:
                     skip.add(fn)
                     if copy:
                         skip.add(copy)
         del revfiles[rev]
         # We will keep the matches dict for the duration of the window
         # clear the matches dict once the window is over
         if not revfiles:
             matches.clear()
     fm.end()
 
     return not found
 
 
 @command(
     b'heads',
     [
         (
             b'r',
             b'rev',
             b'',
             _(b'show only heads which are descendants of STARTREV'),
             _(b'STARTREV'),
         ),
         (b't', b'topo', False, _(b'show topological heads only')),
         (
             b'a',
             b'active',
             False,
             _(b'show active branchheads only (DEPRECATED)'),
         ),
         (b'c', b'closed', False, _(b'show normal and closed branch heads')),
     ]
     + templateopts,
     _(b'[-ct] [-r STARTREV] [REV]...'),
     helpcategory=command.CATEGORY_CHANGE_NAVIGATION,
     intents={INTENT_READONLY},
 )
 def heads(ui, repo, *branchrevs, **opts):
     """show branch heads
 
     With no arguments, show all open branch heads in the repository.
     Branch heads are changesets that have no descendants on the
     same branch. They are where development generally takes place and
     are the usual targets for update and merge operations.
 
     If one or more REVs are given, only open branch heads on the
     branches associated with the specified changesets are shown. This
     means that you can use :hg:`heads .` to see the heads on the
     currently checked-out branch.
 
     If -c/--closed is specified, also show branch heads marked closed
     (see :hg:`commit --close-branch`).
 
     If STARTREV is specified, only those heads that are descendants of
     STARTREV will be displayed.
 
     If -t/--topo is specified, named branch mechanics will be ignored and only
     topological heads (changesets with no children) will be shown.
 
     Returns 0 if matching heads are found, 1 if not.
     """
 
     opts = pycompat.byteskwargs(opts)
     start = None
     rev = opts.get(b'rev')
     if rev:
         repo = scmutil.unhidehashlikerevs(repo, [rev], b'nowarn')
         start = scmutil.revsingle(repo, rev, None).node()
 
     if opts.get(b'topo'):
         heads = [repo[h] for h in repo.heads(start)]
     else:
         heads = []
         for branch in repo.branchmap():
             heads += repo.branchheads(branch, start, opts.get(b'closed'))
         heads = [repo[h] for h in heads]
 
     if branchrevs:
         branches = {
             repo[r].branch() for r in scmutil.revrange(repo, branchrevs)
         }
         heads = [h for h in heads if h.branch() in branches]
 
     if opts.get(b'active') and branchrevs:
         dagheads = repo.heads(start)
         heads = [h for h in heads if h.node() in dagheads]
 
     if branchrevs:
         haveheads = {h.branch() for h in heads}
         if branches - haveheads:
             headless = b', '.join(b for b in branches - haveheads)
             msg = _(b'no open branch heads found on branches %s')
             if opts.get(b'rev'):
                 msg += _(b' (started at %s)') % opts[b'rev']
             ui.warn((msg + b'\n') % headless)
 
     if not heads:
         return 1
 
     ui.pager(b'heads')
     heads = sorted(heads, key=lambda x: -(x.rev()))
     displayer = logcmdutil.changesetdisplayer(ui, repo, opts)
     for ctx in heads:
         displayer.show(ctx)
     displayer.close()
 
 
 @command(
     b'help',
     [
         (b'e', b'extension', None, _(b'show only help for extensions')),
         (b'c', b'command', None, _(b'show only help for commands')),
         (b'k', b'keyword', None, _(b'show topics matching keyword')),
         (
             b's',
             b'system',
             [],
             _(b'show help for specific platform(s)'),
             _(b'PLATFORM'),
         ),
     ],
     _(b'[-eck] [-s PLATFORM] [TOPIC]'),
     helpcategory=command.CATEGORY_HELP,
     norepo=True,
     intents={INTENT_READONLY},
 )
 def help_(ui, name=None, **opts):
     """show help for a given topic or a help overview
 
     With no arguments, print a list of commands with short help messages.
 
     Given a topic, extension, or command name, print help for that
     topic.
 
     Returns 0 if successful.
     """
 
     keep = opts.get('system') or []
     if len(keep) == 0:
         if pycompat.sysplatform.startswith(b'win'):
             keep.append(b'windows')
         elif pycompat.sysplatform == b'OpenVMS':
             keep.append(b'vms')
         elif pycompat.sysplatform == b'plan9':
             keep.append(b'plan9')
         else:
             keep.append(b'unix')
             keep.append(pycompat.sysplatform.lower())
     if ui.verbose:
         keep.append(b'verbose')
 
     commands = sys.modules[__name__]
     formatted = help.formattedhelp(ui, commands, name, keep=keep, **opts)
     ui.pager(b'help')
     ui.write(formatted)
 
 
 @command(
     b'identify|id',
     [
         (b'r', b'rev', b'', _(b'identify the specified revision'), _(b'REV')),
         (b'n', b'num', None, _(b'show local revision number')),
         (b'i', b'id', None, _(b'show global revision id')),
         (b'b', b'branch', None, _(b'show branch')),
         (b't', b'tags', None, _(b'show tags')),
         (b'B', b'bookmarks', None, _(b'show bookmarks')),
     ]
     + remoteopts
     + formatteropts,
     _(b'[-nibtB] [-r REV] [SOURCE]'),
     helpcategory=command.CATEGORY_CHANGE_NAVIGATION,
     optionalrepo=True,
     intents={INTENT_READONLY},
 )
 def identify(
     ui,
     repo,
     source=None,
     rev=None,
     num=None,
     id=None,
     branch=None,
     tags=None,
     bookmarks=None,
     **opts
 ):
     """identify the working directory or specified revision
 
     Print a summary identifying the repository state at REV using one or
     two parent hash identifiers, followed by a "+" if the working
     directory has uncommitted changes, the branch name (if not default),
     a list of tags, and a list of bookmarks.
 
     When REV is not given, print a summary of the current state of the
     repository including the working directory. Specify -r. to get information
     of the working directory parent without scanning uncommitted changes.
 
     Specifying a path to a repository root or Mercurial bundle will
     cause lookup to operate on that repository/bundle.
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported in addition to the common template
       keywords and functions. See also :hg:`help templates`.
 
       :dirty:   String. Character ``+`` denoting if the working directory has
                 uncommitted changes.
       :id:      String. One or two nodes, optionally followed by ``+``.
       :parents: List of strings. Parent nodes of the changeset.
 
       Examples:
 
       - generate a build identifier for the working directory::
 
           hg id --id > build-id.dat
 
       - find the revision corresponding to a tag::
 
           hg id -n -r 1.3
 
       - check the most recent revision of a remote repository::
 
           hg id -r tip https://www.mercurial-scm.org/repo/hg/
 
     See :hg:`log` for generating more information about specific revisions,
     including full hash identifiers.
 
     Returns 0 if successful.
     """
 
     opts = pycompat.byteskwargs(opts)
     if not repo and not source:
         raise error.Abort(
             _(b"there is no Mercurial repository here (.hg not found)")
         )
 
     default = not (num or id or branch or tags or bookmarks)
     output = []
     revs = []
 
     if source:
         source, branches = hg.parseurl(ui.expandpath(source))
         peer = hg.peer(repo or ui, opts, source)  # only pass ui when no repo
         repo = peer.local()
         revs, checkout = hg.addbranchrevs(repo, peer, branches, None)
 
     fm = ui.formatter(b'identify', opts)
     fm.startitem()
 
     if not repo:
         if num or branch or tags:
             raise error.Abort(
                 _(b"can't query remote revision number, branch, or tags")
             )
         if not rev and revs:
             rev = revs[0]
         if not rev:
             rev = b"tip"
 
         remoterev = peer.lookup(rev)
         hexrev = fm.hexfunc(remoterev)
         if default or id:
             output = [hexrev]
         fm.data(id=hexrev)
 
         @util.cachefunc
         def getbms():
             bms = []
 
             if b'bookmarks' in peer.listkeys(b'namespaces'):
                 hexremoterev = hex(remoterev)
                 bms = [
                     bm
                     for bm, bmr in pycompat.iteritems(
                         peer.listkeys(b'bookmarks')
                     )
                     if bmr == hexremoterev
                 ]
 
             return sorted(bms)
 
         if fm.isplain():
             if bookmarks:
                 output.extend(getbms())
             elif default and not ui.quiet:
                 # multiple bookmarks for a single parent separated by '/'
                 bm = b'/'.join(getbms())
                 if bm:
                     output.append(bm)
         else:
             fm.data(node=hex(remoterev))
             if bookmarks or b'bookmarks' in fm.datahint():
                 fm.data(bookmarks=fm.formatlist(getbms(), name=b'bookmark'))
     else:
         if rev:
             repo = scmutil.unhidehashlikerevs(repo, [rev], b'nowarn')
         ctx = scmutil.revsingle(repo, rev, None)
 
         if ctx.rev() is None:
             ctx = repo[None]
             parents = ctx.parents()
             taglist = []
             for p in parents:
                 taglist.extend(p.tags())
 
             dirty = b""
             if ctx.dirty(missing=True, merge=False, branch=False):
                 dirty = b'+'
             fm.data(dirty=dirty)
 
             hexoutput = [fm.hexfunc(p.node()) for p in parents]
             if default or id:
                 output = [b"%s%s" % (b'+'.join(hexoutput), dirty)]
             fm.data(id=b"%s%s" % (b'+'.join(hexoutput), dirty))
 
             if num:
                 numoutput = [b"%d" % p.rev() for p in parents]
                 output.append(b"%s%s" % (b'+'.join(numoutput), dirty))
 
             fm.data(
                 parents=fm.formatlist(
                     [fm.hexfunc(p.node()) for p in parents], name=b'node'
                 )
             )
         else:
             hexoutput = fm.hexfunc(ctx.node())
             if default or id:
                 output = [hexoutput]
             fm.data(id=hexoutput)
 
             if num:
                 output.append(pycompat.bytestr(ctx.rev()))
             taglist = ctx.tags()
 
         if default and not ui.quiet:
             b = ctx.branch()
             if b != b'default':
                 output.append(b"(%s)" % b)
 
             # multiple tags for a single parent separated by '/'
             t = b'/'.join(taglist)
             if t:
                 output.append(t)
 
             # multiple bookmarks for a single parent separated by '/'
             bm = b'/'.join(ctx.bookmarks())
             if bm:
                 output.append(bm)
         else:
             if branch:
                 output.append(ctx.branch())
 
             if tags:
                 output.extend(taglist)
 
             if bookmarks:
                 output.extend(ctx.bookmarks())
 
         fm.data(node=ctx.hex())
         fm.data(branch=ctx.branch())
         fm.data(tags=fm.formatlist(taglist, name=b'tag', sep=b':'))
         fm.data(bookmarks=fm.formatlist(ctx.bookmarks(), name=b'bookmark'))
         fm.context(ctx=ctx)
 
     fm.plain(b"%s\n" % b' '.join(output))
     fm.end()
 
 
 @command(
     b'import|patch',
     [
         (
             b'p',
             b'strip',
             1,
             _(
                 b'directory strip option for patch. This has the same '
                 b'meaning as the corresponding patch option'
             ),
             _(b'NUM'),
         ),
         (b'b', b'base', b'', _(b'base path (DEPRECATED)'), _(b'PATH')),
         (b'', b'secret', None, _(b'use the secret phase for committing')),
         (b'e', b'edit', False, _(b'invoke editor on commit messages')),
         (
             b'f',
             b'force',
             None,
             _(b'skip check for outstanding uncommitted changes (DEPRECATED)'),
         ),
         (
             b'',
             b'no-commit',
             None,
             _(b"don't commit, just update the working directory"),
         ),
         (
             b'',
             b'bypass',
             None,
             _(b"apply patch without touching the working directory"),
         ),
         (b'', b'partial', None, _(b'commit even if some hunks fail')),
         (b'', b'exact', None, _(b'abort if patch would apply lossily')),
         (b'', b'prefix', b'', _(b'apply patch to subdirectory'), _(b'DIR')),
         (
             b'',
             b'import-branch',
             None,
             _(b'use any branch information in patch (implied by --exact)'),
         ),
     ]
     + commitopts
     + commitopts2
     + similarityopts,
     _(b'[OPTION]... PATCH...'),
     helpcategory=command.CATEGORY_IMPORT_EXPORT,
 )
 def import_(ui, repo, patch1=None, *patches, **opts):
     """import an ordered set of patches
 
     Import a list of patches and commit them individually (unless
     --no-commit is specified).
 
     To read a patch from standard input (stdin), use "-" as the patch
     name. If a URL is specified, the patch will be downloaded from
     there.
 
     Import first applies changes to the working directory (unless
     --bypass is specified), import will abort if there are outstanding
     changes.
 
     Use --bypass to apply and commit patches directly to the
     repository, without affecting the working directory. Without
     --exact, patches will be applied on top of the working directory
     parent revision.
 
     You can import a patch straight from a mail message. Even patches
     as attachments work (to use the body part, it must have type
     text/plain or text/x-patch). From and Subject headers of email
     message are used as default committer and commit message. All
     text/plain body parts before first diff are added to the commit
     message.
 
     If the imported patch was generated by :hg:`export`, user and
     description from patch override values from message headers and
     body. Values given on command line with -m/--message and -u/--user
     override these.
 
     If --exact is specified, import will set the working directory to
     the parent of each patch before applying it, and will abort if the
     resulting changeset has a different ID than the one recorded in
     the patch. This will guard against various ways that portable
     patch formats and mail systems might fail to transfer Mercurial
     data or metadata. See :hg:`bundle` for lossless transmission.
 
     Use --partial to ensure a changeset will be created from the patch
     even if some hunks fail to apply. Hunks that fail to apply will be
     written to a <target-file>.rej file. Conflicts can then be resolved
     by hand before :hg:`commit --amend` is run to update the created
     changeset. This flag exists to let people import patches that
     partially apply without losing the associated metadata (author,
     date, description, ...).
 
     .. note::
 
        When no hunks apply cleanly, :hg:`import --partial` will create
        an empty changeset, importing only the patch metadata.
 
     With -s/--similarity, hg will attempt to discover renames and
     copies in the patch in the same way as :hg:`addremove`.
 
     It is possible to use external patch programs to perform the patch
     by setting the ``ui.patch`` configuration option. For the default
     internal tool, the fuzz can also be configured via ``patch.fuzz``.
     See :hg:`help config` for more information about configuration
     files and how to use these options.
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     .. container:: verbose
 
       Examples:
 
       - import a traditional patch from a website and detect renames::
 
           hg import -s 80 http://example.com/bugfix.patch
 
       - import a changeset from an hgweb server::
 
           hg import https://www.mercurial-scm.org/repo/hg/rev/5ca8c111e9aa
 
       - import all the patches in an Unix-style mbox::
 
           hg import incoming-patches.mbox
 
       - import patches from stdin::
 
           hg import -
 
       - attempt to exactly restore an exported changeset (not always
         possible)::
 
           hg import --exact proposed-fix.patch
 
       - use an external tool to apply a patch which is too fuzzy for
         the default internal tool.
 
           hg import --config ui.patch="patch --merge" fuzzy.patch
 
       - change the default fuzzing from 2 to a less strict 7
 
           hg import --config ui.fuzz=7 fuzz.patch
 
     Returns 0 on success, 1 on partial success (see --partial).
     """
 
     opts = pycompat.byteskwargs(opts)
     if not patch1:
         raise error.Abort(_(b'need at least one patch to import'))
 
     patches = (patch1,) + patches
 
     date = opts.get(b'date')
     if date:
         opts[b'date'] = dateutil.parsedate(date)
 
     exact = opts.get(b'exact')
     update = not opts.get(b'bypass')
     if not update and opts.get(b'no_commit'):
         raise error.Abort(_(b'cannot use --no-commit with --bypass'))
     if opts.get(b'secret') and opts.get(b'no_commit'):
         raise error.Abort(_(b'cannot use --no-commit with --secret'))
     try:
         sim = float(opts.get(b'similarity') or 0)
     except ValueError:
         raise error.Abort(_(b'similarity must be a number'))
     if sim < 0 or sim > 100:
         raise error.Abort(_(b'similarity must be between 0 and 100'))
     if sim and not update:
         raise error.Abort(_(b'cannot use --similarity with --bypass'))
     if exact:
         if opts.get(b'edit'):
             raise error.Abort(_(b'cannot use --exact with --edit'))
         if opts.get(b'prefix'):
             raise error.Abort(_(b'cannot use --exact with --prefix'))
 
     base = opts[b"base"]
     msgs = []
     ret = 0
 
     with repo.wlock():
         if update:
             cmdutil.checkunfinished(repo)
             if exact or not opts.get(b'force'):
                 cmdutil.bailifchanged(repo)
 
         if not opts.get(b'no_commit'):
             lock = repo.lock
             tr = lambda: repo.transaction(b'import')
             dsguard = util.nullcontextmanager
         else:
             lock = util.nullcontextmanager
             tr = util.nullcontextmanager
             dsguard = lambda: dirstateguard.dirstateguard(repo, b'import')
         with lock(), tr(), dsguard():
             parents = repo[None].parents()
             for patchurl in patches:
                 if patchurl == b'-':
                     ui.status(_(b'applying patch from stdin\n'))
                     patchfile = ui.fin
                     patchurl = b'stdin'  # for error message
                 else:
                     patchurl = os.path.join(base, patchurl)
                     ui.status(_(b'applying %s\n') % patchurl)
                     patchfile = hg.openpath(ui, patchurl, sendaccept=False)
 
                 haspatch = False
                 for hunk in patch.split(patchfile):
                     with patch.extract(ui, hunk) as patchdata:
                         msg, node, rej = cmdutil.tryimportone(
                             ui, repo, patchdata, parents, opts, msgs, hg.clean
                         )
                     if msg:
                         haspatch = True
                         ui.note(msg + b'\n')
                     if update or exact:
                         parents = repo[None].parents()
                     else:
                         parents = [repo[node]]
                     if rej:
                         ui.write_err(_(b"patch applied partially\n"))
                         ui.write_err(
                             _(
                                 b"(fix the .rej files and run "
                                 b"`hg commit --amend`)\n"
                             )
                         )
                         ret = 1
                         break
 
                 if not haspatch:
                     raise error.Abort(_(b'%s: no diffs found') % patchurl)
 
             if msgs:
                 repo.savecommitmessage(b'\n* * *\n'.join(msgs))
         return ret
 
 
 @command(
     b'incoming|in',
     [
         (
             b'f',
             b'force',
             None,
             _(b'run even if remote repository is unrelated'),
         ),
         (b'n', b'newest-first', None, _(b'show newest record first')),
         (b'', b'bundle', b'', _(b'file to store the bundles into'), _(b'FILE')),
         (
             b'r',
             b'rev',
             [],
             _(b'a remote changeset intended to be added'),
             _(b'REV'),
         ),
         (b'B', b'bookmarks', False, _(b"compare bookmarks")),
         (
             b'b',
             b'branch',
             [],
             _(b'a specific branch you would like to pull'),
             _(b'BRANCH'),
         ),
     ]
     + logopts
     + remoteopts
     + subrepoopts,
     _(b'[-p] [-n] [-M] [-f] [-r REV]... [--bundle FILENAME] [SOURCE]'),
     helpcategory=command.CATEGORY_REMOTE_REPO_MANAGEMENT,
 )
 def incoming(ui, repo, source=b"default", **opts):
     """show new changesets found in source
 
     Show new changesets found in the specified path/URL or the default
     pull location. These are the changesets that would have been pulled
     by :hg:`pull` at the time you issued this command.
 
     See pull for valid source format details.
 
     .. container:: verbose
 
       With -B/--bookmarks, the result of bookmark comparison between
       local and remote repositories is displayed. With -v/--verbose,
       status is also displayed for each bookmark like below::
 
         BM1               01234567890a added
         BM2               1234567890ab advanced
         BM3               234567890abc diverged
         BM4               34567890abcd changed
 
       The action taken locally when pulling depends on the
       status of each bookmark:
 
       :``added``: pull will create it
       :``advanced``: pull will update it
       :``diverged``: pull will create a divergent bookmark
       :``changed``: result depends on remote changesets
 
       From the point of view of pulling behavior, bookmark
       existing only in the remote repository are treated as ``added``,
       even if it is in fact locally deleted.
 
     .. container:: verbose
 
       For remote repository, using --bundle avoids downloading the
       changesets twice if the incoming is followed by a pull.
 
       Examples:
 
       - show incoming changes with patches and full description::
 
           hg incoming -vp
 
       - show incoming changes excluding merges, store a bundle::
 
           hg in -vpM --bundle incoming.hg
           hg pull incoming.hg
 
       - briefly list changes inside a bundle::
 
           hg in changes.hg -T "{desc|firstline}\\n"
 
     Returns 0 if there are incoming changes, 1 otherwise.
     """
     opts = pycompat.byteskwargs(opts)
     if opts.get(b'graph'):
         logcmdutil.checkunsupportedgraphflags([], opts)
 
         def display(other, chlist, displayer):
             revdag = logcmdutil.graphrevs(other, chlist, opts)
             logcmdutil.displaygraph(
                 ui, repo, revdag, displayer, graphmod.asciiedges
             )
 
         hg._incoming(display, lambda: 1, ui, repo, source, opts, buffered=True)
         return 0
 
     if opts.get(b'bundle') and opts.get(b'subrepos'):
         raise error.Abort(_(b'cannot combine --bundle and --subrepos'))
 
     if opts.get(b'bookmarks'):
         source, branches = hg.parseurl(
             ui.expandpath(source), opts.get(b'branch')
         )
         other = hg.peer(repo, opts, source)
         if b'bookmarks' not in other.listkeys(b'namespaces'):
             ui.warn(_(b"remote doesn't support bookmarks\n"))
             return 0
         ui.pager(b'incoming')
         ui.status(_(b'comparing with %s\n') % util.hidepassword(source))
         return bookmarks.incoming(ui, repo, other)
 
     repo._subtoppath = ui.expandpath(source)
     try:
         return hg.incoming(ui, repo, source, opts)
     finally:
         del repo._subtoppath
 
 
 @command(
     b'init',
     remoteopts,
     _(b'[-e CMD] [--remotecmd CMD] [DEST]'),
     helpcategory=command.CATEGORY_REPO_CREATION,
     helpbasic=True,
     norepo=True,
 )
 def init(ui, dest=b".", **opts):
     """create a new repository in the given directory
 
     Initialize a new repository in the given directory. If the given
     directory does not exist, it will be created.
 
     If no directory is given, the current directory is used.
 
     It is possible to specify an ``ssh://`` URL as the destination.
     See :hg:`help urls` for more information.
 
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
     hg.peer(ui, opts, ui.expandpath(dest), create=True)
 
 
 @command(
     b'locate',
     [
         (
             b'r',
             b'rev',
             b'',
             _(b'search the repository as it is in REV'),
             _(b'REV'),
         ),
         (
             b'0',
             b'print0',
             None,
             _(b'end filenames with NUL, for use with xargs'),
         ),
         (
             b'f',
             b'fullpath',
             None,
             _(b'print complete paths from the filesystem root'),
         ),
     ]
     + walkopts,
     _(b'[OPTION]... [PATTERN]...'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
 )
 def locate(ui, repo, *pats, **opts):
     """locate files matching specific patterns (DEPRECATED)
 
     Print files under Mercurial control in the working directory whose
     names match the given patterns.
 
     By default, this command searches all directories in the working
     directory. To search just the current directory and its
     subdirectories, use "--include .".
 
     If no patterns are given to match, this command prints the names
     of all files under Mercurial control in the working directory.
 
     If you want to feed the output of this command into the "xargs"
     command, use the -0 option to both this command and "xargs". This
     will avoid the problem of "xargs" treating single filenames that
     contain whitespace as multiple filenames.
 
     See :hg:`help files` for a more versatile command.
 
     Returns 0 if a match is found, 1 otherwise.
     """
     opts = pycompat.byteskwargs(opts)
     if opts.get(b'print0'):
         end = b'\0'
     else:
         end = b'\n'
     ctx = scmutil.revsingle(repo, opts.get(b'rev'), None)
 
     ret = 1
     m = scmutil.match(
         ctx, pats, opts, default=b'relglob', badfn=lambda x, y: False
     )
 
     ui.pager(b'locate')
     if ctx.rev() is None:
         # When run on the working copy, "locate" includes removed files, so
         # we get the list of files from the dirstate.
         filesgen = sorted(repo.dirstate.matches(m))
     else:
         filesgen = ctx.matches(m)
     uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=bool(pats))
     for abs in filesgen:
         if opts.get(b'fullpath'):
             ui.write(repo.wjoin(abs), end)
         else:
             ui.write(uipathfn(abs), end)
         ret = 0
 
     return ret
 
 
 @command(
     b'log|history',
     [
         (
             b'f',
             b'follow',
             None,
             _(
                 b'follow changeset history, or file history across copies and renames'
             ),
         ),
         (
             b'',
             b'follow-first',
             None,
             _(b'only follow the first parent of merge changesets (DEPRECATED)'),
         ),
         (
             b'd',
             b'date',
             b'',
             _(b'show revisions matching date spec'),
             _(b'DATE'),
         ),
         (b'C', b'copies', None, _(b'show copied files')),
         (
             b'k',
             b'keyword',
             [],
             _(b'do case-insensitive search for a given text'),
             _(b'TEXT'),
         ),
         (
             b'r',
             b'rev',
             [],
             _(b'show the specified revision or revset'),
             _(b'REV'),
         ),
         (
             b'L',
             b'line-range',
             [],
             _(b'follow line range of specified file (EXPERIMENTAL)'),
             _(b'FILE,RANGE'),
         ),
         (
             b'',
             b'removed',
             None,
             _(b'include revisions where files were removed'),
         ),
         (
             b'm',
             b'only-merges',
             None,
             _(b'show only merges (DEPRECATED) (use -r "merge()" instead)'),
         ),
         (b'u', b'user', [], _(b'revisions committed by user'), _(b'USER')),
         (
             b'',
             b'only-branch',
             [],
             _(
                 b'show only changesets within the given named branch (DEPRECATED)'
             ),
             _(b'BRANCH'),
         ),
         (
             b'b',
             b'branch',
             [],
             _(b'show changesets within the given named branch'),
             _(b'BRANCH'),
         ),
         (
             b'P',
             b'prune',
             [],
             _(b'do not display revision or any of its ancestors'),
             _(b'REV'),
         ),
     ]
     + logopts
     + walkopts,
     _(b'[OPTION]... [FILE]'),
     helpcategory=command.CATEGORY_CHANGE_NAVIGATION,
     helpbasic=True,
     inferrepo=True,
     intents={INTENT_READONLY},
 )
 def log(ui, repo, *pats, **opts):
     """show revision history of entire repository or files
 
     Print the revision history of the specified files or the entire
     project.
 
     If no revision range is specified, the default is ``tip:0`` unless
     --follow is set, in which case the working directory parent is
     used as the starting revision.
 
     File history is shown without following rename or copy history of
     files. Use -f/--follow with a filename to follow history across
     renames and copies. --follow without a filename will only show
     ancestors of the starting revision.
 
     By default this command prints revision number and changeset id,
     tags, non-trivial parents, user, date and time, and a summary for
     each commit. When the -v/--verbose switch is used, the list of
     changed files and full commit message are shown.
 
     With --graph the revisions are shown as an ASCII art DAG with the most
     recent changeset at the top.
     'o' is a changeset, '@' is a working directory parent, '_' closes a branch,
     'x' is obsolete, '*' is unstable, and '+' represents a fork where the
     changeset from the lines below is a parent of the 'o' merge on the same
     line.
     Paths in the DAG are represented with '|', '/' and so forth. ':' in place
     of a '|' indicates one or more revisions in a path are omitted.
 
     .. container:: verbose
 
        Use -L/--line-range FILE,M:N options to follow the history of lines
        from M to N in FILE. With -p/--patch only diff hunks affecting
        specified line range will be shown. This option requires --follow;
        it can be specified multiple times. Currently, this option is not
        compatible with --graph. This option is experimental.
 
     .. note::
 
        :hg:`log --patch` may generate unexpected diff output for merge
        changesets, as it will only compare the merge changeset against
        its first parent. Also, only files different from BOTH parents
        will appear in files:.
 
     .. note::
 
        For performance reasons, :hg:`log FILE` may omit duplicate changes
        made on branches and will not show removals or mode changes. To
        see all such changes, use the --removed switch.
 
     .. container:: verbose
 
        .. note::
 
           The history resulting from -L/--line-range options depends on diff
           options; for instance if white-spaces are ignored, respective changes
           with only white-spaces in specified line range will not be listed.
 
     .. container:: verbose
 
       Some examples:
 
       - changesets with full descriptions and file lists::
 
           hg log -v
 
       - changesets ancestral to the working directory::
 
           hg log -f
 
       - last 10 commits on the current branch::
 
           hg log -l 10 -b .
 
       - changesets showing all modifications of a file, including removals::
 
           hg log --removed file.c
 
       - all changesets that touch a directory, with diffs, excluding merges::
 
           hg log -Mp lib/
 
       - all revision numbers that match a keyword::
 
           hg log -k bug --template "{rev}\\n"
 
       - the full hash identifier of the working directory parent::
 
           hg log -r . --template "{node}\\n"
 
       - list available log templates::
 
           hg log -T list
 
       - check if a given changeset is included in a tagged release::
 
           hg log -r "a21ccf and ancestor(1.9)"
 
       - find all changesets by some user in a date range::
 
           hg log -k alice -d "may 2008 to jul 2008"
 
       - summary of all changesets after the last tag::
 
           hg log -r "last(tagged())::" --template "{desc|firstline}\\n"
 
       - changesets touching lines 13 to 23 for file.c::
 
           hg log -L file.c,13:23
 
       - changesets touching lines 13 to 23 for file.c and lines 2 to 6 of
         main.c with patch::
 
           hg log -L file.c,13:23 -L main.c,2:6 -p
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     See :hg:`help revisions` for more about specifying and ordering
     revisions.
 
     See :hg:`help templates` for more about pre-packaged styles and
     specifying custom templates. The default template used by the log
     command can be customized via the ``ui.logtemplate`` configuration
     setting.
 
     Returns 0 on success.
 
     """
     opts = pycompat.byteskwargs(opts)
     linerange = opts.get(b'line_range')
 
     if linerange and not opts.get(b'follow'):
         raise error.Abort(_(b'--line-range requires --follow'))
 
     if linerange and pats:
         # TODO: take pats as patterns with no line-range filter
         raise error.Abort(
             _(b'FILE arguments are not compatible with --line-range option')
         )
 
     repo = scmutil.unhidehashlikerevs(repo, opts.get(b'rev'), b'nowarn')
     revs, differ = logcmdutil.getrevs(repo, pats, opts)
     if linerange:
         # TODO: should follow file history from logcmdutil._initialrevs(),
         # then filter the result by logcmdutil._makerevset() and --limit
         revs, differ = logcmdutil.getlinerangerevs(repo, revs, opts)
 
     getcopies = None
     if opts.get(b'copies'):
         endrev = None
         if revs:
             endrev = revs.max() + 1
         getcopies = scmutil.getcopiesfn(repo, endrev=endrev)
 
     ui.pager(b'log')
     displayer = logcmdutil.changesetdisplayer(
         ui, repo, opts, differ, buffered=True
     )
     if opts.get(b'graph'):
         displayfn = logcmdutil.displaygraphrevs
     else:
         displayfn = logcmdutil.displayrevs
     displayfn(ui, repo, revs, displayer, getcopies)
 
 
 @command(
     b'manifest',
     [
         (b'r', b'rev', b'', _(b'revision to display'), _(b'REV')),
         (b'', b'all', False, _(b"list files from all revisions")),
     ]
     + formatteropts,
     _(b'[-r REV]'),
     helpcategory=command.CATEGORY_MAINTENANCE,
     intents={INTENT_READONLY},
 )
 def manifest(ui, repo, node=None, rev=None, **opts):
     """output the current or given revision of the project manifest
 
     Print a list of version controlled files for the given revision.
     If no revision is given, the first parent of the working directory
     is used, or the null revision if no revision is checked out.
 
     With -v, print file permissions, symlink and executable bits.
     With --debug, print file revision hashes.
 
     If option --all is specified, the list of all files from all revisions
     is printed. This includes deleted and renamed files.
 
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
     fm = ui.formatter(b'manifest', opts)
 
     if opts.get(b'all'):
         if rev or node:
             raise error.Abort(_(b"can't specify a revision with --all"))
 
         res = set()
         for rev in repo:
             ctx = repo[rev]
             res |= set(ctx.files())
 
         ui.pager(b'manifest')
         for f in sorted(res):
             fm.startitem()
             fm.write(b"path", b'%s\n', f)
         fm.end()
         return
 
     if rev and node:
         raise error.Abort(_(b"please specify just one revision"))
 
     if not node:
         node = rev
 
     char = {b'l': b'@', b'x': b'*', b'': b'', b't': b'd'}
     mode = {b'l': b'644', b'x': b'755', b'': b'644', b't': b'755'}
     if node:
         repo = scmutil.unhidehashlikerevs(repo, [node], b'nowarn')
     ctx = scmutil.revsingle(repo, node)
     mf = ctx.manifest()
     ui.pager(b'manifest')
     for f in ctx:
         fm.startitem()
         fm.context(ctx=ctx)
         fl = ctx[f].flags()
         fm.condwrite(ui.debugflag, b'hash', b'%s ', hex(mf[f]))
         fm.condwrite(ui.verbose, b'mode type', b'%s %1s ', mode[fl], char[fl])
         fm.write(b'path', b'%s\n', f)
     fm.end()
 
 
 @command(
     b'merge',
     [
         (
             b'f',
             b'force',
             None,
             _(b'force a merge including outstanding changes (DEPRECATED)'),
         ),
         (b'r', b'rev', b'', _(b'revision to merge'), _(b'REV')),
         (
             b'P',
             b'preview',
             None,
             _(b'review revisions to merge (no merge is performed)'),
         ),
         (b'', b'abort', None, _(b'abort the ongoing merge')),
     ]
     + mergetoolopts,
     _(b'[-P] [[-r] REV]'),
     helpcategory=command.CATEGORY_CHANGE_MANAGEMENT,
     helpbasic=True,
 )
 def merge(ui, repo, node=None, **opts):
     """merge another revision into working directory
 
     The current working directory is updated with all changes made in
     the requested revision since the last common predecessor revision.
 
     Files that changed between either parent are marked as changed for
     the next commit and a commit must be performed before any further
     updates to the repository are allowed. The next commit will have
     two parents.
 
     ``--tool`` can be used to specify the merge tool used for file
     merges. It overrides the HGMERGE environment variable and your
     configuration files. See :hg:`help merge-tools` for options.
 
     If no revision is specified, the working directory's parent is a
     head revision, and the current branch contains exactly one other
     head, the other head is merged with by default. Otherwise, an
     explicit revision with which to merge must be provided.
 
     See :hg:`help resolve` for information on handling file conflicts.
 
     To undo an uncommitted merge, use :hg:`merge --abort` which
     will check out a clean copy of the original merge parent, losing
     all changes.
 
     Returns 0 on success, 1 if there are unresolved files.
     """
 
     opts = pycompat.byteskwargs(opts)
     abort = opts.get(b'abort')
     if abort and repo.dirstate.p2() == nullid:
         cmdutil.wrongtooltocontinue(repo, _(b'merge'))
     cmdutil.check_incompatible_arguments(opts, b'abort', [b'rev', b'preview'])
     if abort:
         state = cmdutil.getunfinishedstate(repo)
         if state and state._opname != b'merge':
             raise error.Abort(
                 _(b'cannot abort merge with %s in progress') % (state._opname),
                 hint=state.hint(),
             )
         if node:
             raise error.Abort(_(b"cannot specify a node with --abort"))
         return hg.abortmerge(repo.ui, repo)
 
     if opts.get(b'rev') and node:
         raise error.Abort(_(b"please specify just one revision"))
     if not node:
         node = opts.get(b'rev')
 
     if node:
         ctx = scmutil.revsingle(repo, node)
     else:
         if ui.configbool(b'commands', b'merge.require-rev'):
             raise error.Abort(
                 _(
                     b'configuration requires specifying revision to merge '
                     b'with'
                 )
             )
         ctx = repo[destutil.destmerge(repo)]
 
     if ctx.node() is None:
         raise error.Abort(_(b'merging with the working copy has no effect'))
 
     if opts.get(b'preview'):
         # find nodes that are ancestors of p2 but not of p1
         p1 = repo[b'.'].node()
         p2 = ctx.node()
         nodes = repo.changelog.findmissing(common=[p1], heads=[p2])
 
         displayer = logcmdutil.changesetdisplayer(ui, repo, opts)
         for node in nodes:
             displayer.show(repo[node])
         displayer.close()
         return 0
 
     # ui.forcemerge is an internal variable, do not document
     overrides = {(b'ui', b'forcemerge'): opts.get(b'tool', b'')}
     with ui.configoverride(overrides, b'merge'):
         force = opts.get(b'force')
         labels = [b'working copy', b'merge rev']
         return hg.merge(ctx, force=force, labels=labels)
 
 
 statemod.addunfinished(
     b'merge',
     fname=None,
     clearable=True,
     allowcommit=True,
     cmdmsg=_(b'outstanding uncommitted merge'),
     abortfunc=hg.abortmerge,
     statushint=_(
         b'To continue:    hg commit\nTo abort:       hg merge --abort'
     ),
     cmdhint=_(b"use 'hg commit' or 'hg merge --abort'"),
 )
 
 
 @command(
     b'outgoing|out',
     [
         (
             b'f',
             b'force',
             None,
             _(b'run even when the destination is unrelated'),
         ),
         (
             b'r',
             b'rev',
             [],
             _(b'a changeset intended to be included in the destination'),
             _(b'REV'),
         ),
         (b'n', b'newest-first', None, _(b'show newest record first')),
         (b'B', b'bookmarks', False, _(b'compare bookmarks')),
         (
             b'b',
             b'branch',
             [],
             _(b'a specific branch you would like to push'),
             _(b'BRANCH'),
         ),
     ]
     + logopts
     + remoteopts
     + subrepoopts,
     _(b'[-M] [-p] [-n] [-f] [-r REV]... [DEST]'),
     helpcategory=command.CATEGORY_REMOTE_REPO_MANAGEMENT,
 )
 def outgoing(ui, repo, dest=None, **opts):
     """show changesets not found in the destination
 
     Show changesets not found in the specified destination repository
     or the default push location. These are the changesets that would
     be pushed if a push was requested.
 
     See pull for details of valid destination formats.
 
     .. container:: verbose
 
       With -B/--bookmarks, the result of bookmark comparison between
       local and remote repositories is displayed. With -v/--verbose,
       status is also displayed for each bookmark like below::
 
         BM1               01234567890a added
         BM2                            deleted
         BM3               234567890abc advanced
         BM4               34567890abcd diverged
         BM5               4567890abcde changed
 
       The action taken when pushing depends on the
       status of each bookmark:
 
       :``added``: push with ``-B`` will create it
       :``deleted``: push with ``-B`` will delete it
       :``advanced``: push will update it
       :``diverged``: push with ``-B`` will update it
       :``changed``: push with ``-B`` will update it
 
       From the point of view of pushing behavior, bookmarks
       existing only in the remote repository are treated as
       ``deleted``, even if it is in fact added remotely.
 
     Returns 0 if there are outgoing changes, 1 otherwise.
     """
     # hg._outgoing() needs to re-resolve the path in order to handle #branch
     # style URLs, so don't overwrite dest.
     path = ui.paths.getpath(dest, default=(b'default-push', b'default'))
     if not path:
         raise error.Abort(
             _(b'default repository not configured!'),
             hint=_(b"see 'hg help config.paths'"),
         )
 
     opts = pycompat.byteskwargs(opts)
     if opts.get(b'graph'):
         logcmdutil.checkunsupportedgraphflags([], opts)
         o, other = hg._outgoing(ui, repo, dest, opts)
         if not o:
             cmdutil.outgoinghooks(ui, repo, other, opts, o)
             return
 
         revdag = logcmdutil.graphrevs(repo, o, opts)
         ui.pager(b'outgoing')
         displayer = logcmdutil.changesetdisplayer(ui, repo, opts, buffered=True)
         logcmdutil.displaygraph(
             ui, repo, revdag, displayer, graphmod.asciiedges
         )
         cmdutil.outgoinghooks(ui, repo, other, opts, o)
         return 0
 
     if opts.get(b'bookmarks'):
         dest = path.pushloc or path.loc
         other = hg.peer(repo, opts, dest)
         if b'bookmarks' not in other.listkeys(b'namespaces'):
             ui.warn(_(b"remote doesn't support bookmarks\n"))
             return 0
         ui.status(_(b'comparing with %s\n') % util.hidepassword(dest))
         ui.pager(b'outgoing')
         return bookmarks.outgoing(ui, repo, other)
 
     repo._subtoppath = path.pushloc or path.loc
     try:
         return hg.outgoing(ui, repo, dest, opts)
     finally:
         del repo._subtoppath
 
 
 @command(
     b'parents',
     [
         (
             b'r',
             b'rev',
             b'',
             _(b'show parents of the specified revision'),
             _(b'REV'),
         ),
     ]
     + templateopts,
     _(b'[-r REV] [FILE]'),
     helpcategory=command.CATEGORY_CHANGE_NAVIGATION,
     inferrepo=True,
 )
 def parents(ui, repo, file_=None, **opts):
     """show the parents of the working directory or revision (DEPRECATED)
 
     Print the working directory's parent revisions. If a revision is
     given via -r/--rev, the parent of that revision will be printed.
     If a file argument is given, the revision in which the file was
     last changed (before the working directory revision or the
     argument to --rev if given) is printed.
 
     This command is equivalent to::
 
         hg log -r "p1()+p2()" or
         hg log -r "p1(REV)+p2(REV)" or
         hg log -r "max(::p1() and file(FILE))+max(::p2() and file(FILE))" or
         hg log -r "max(::p1(REV) and file(FILE))+max(::p2(REV) and file(FILE))"
 
     See :hg:`summary` and :hg:`help revsets` for related information.
 
     Returns 0 on success.
     """
 
     opts = pycompat.byteskwargs(opts)
     rev = opts.get(b'rev')
     if rev:
         repo = scmutil.unhidehashlikerevs(repo, [rev], b'nowarn')
     ctx = scmutil.revsingle(repo, rev, None)
 
     if file_:
         m = scmutil.match(ctx, (file_,), opts)
         if m.anypats() or len(m.files()) != 1:
             raise error.Abort(_(b'can only specify an explicit filename'))
         file_ = m.files()[0]
         filenodes = []
         for cp in ctx.parents():
             if not cp:
                 continue
             try:
                 filenodes.append(cp.filenode(file_))
             except error.LookupError:
                 pass
         if not filenodes:
             raise error.Abort(_(b"'%s' not found in manifest!") % file_)
         p = []
         for fn in filenodes:
             fctx = repo.filectx(file_, fileid=fn)
             p.append(fctx.node())
     else:
         p = [cp.node() for cp in ctx.parents()]
 
     displayer = logcmdutil.changesetdisplayer(ui, repo, opts)
     for n in p:
         if n != nullid:
             displayer.show(repo[n])
     displayer.close()
 
 
 @command(
     b'paths',
     formatteropts,
     _(b'[NAME]'),
     helpcategory=command.CATEGORY_REMOTE_REPO_MANAGEMENT,
     optionalrepo=True,
     intents={INTENT_READONLY},
 )
 def paths(ui, repo, search=None, **opts):
     """show aliases for remote repositories
 
     Show definition of symbolic path name NAME. If no name is given,
     show definition of all available names.
 
     Option -q/--quiet suppresses all output when searching for NAME
     and shows only the path names when listing all definitions.
 
     Path names are defined in the [paths] section of your
     configuration file and in ``/etc/mercurial/hgrc``. If run inside a
     repository, ``.hg/hgrc`` is used, too.
 
     The path names ``default`` and ``default-push`` have a special
     meaning.  When performing a push or pull operation, they are used
     as fallbacks if no location is specified on the command-line.
     When ``default-push`` is set, it will be used for push and
     ``default`` will be used for pull; otherwise ``default`` is used
     as the fallback for both.  When cloning a repository, the clone
     source is written as ``default`` in ``.hg/hgrc``.
 
     .. note::
 
        ``default`` and ``default-push`` apply to all inbound (e.g.
        :hg:`incoming`) and outbound (e.g. :hg:`outgoing`, :hg:`email`
        and :hg:`bundle`) operations.
 
     See :hg:`help urls` for more information.
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported. See also :hg:`help templates`.
 
       :name:    String. Symbolic name of the path alias.
       :pushurl: String. URL for push operations.
       :url:     String. URL or directory path for the other operations.
 
     Returns 0 on success.
     """
 
     opts = pycompat.byteskwargs(opts)
     ui.pager(b'paths')
     if search:
         pathitems = [
             (name, path)
             for name, path in pycompat.iteritems(ui.paths)
             if name == search
         ]
     else:
         pathitems = sorted(pycompat.iteritems(ui.paths))
 
     fm = ui.formatter(b'paths', opts)
     if fm.isplain():
         hidepassword = util.hidepassword
     else:
         hidepassword = bytes
     if ui.quiet:
         namefmt = b'%s\n'
     else:
         namefmt = b'%s = '
     showsubopts = not search and not ui.quiet
 
     for name, path in pathitems:
         fm.startitem()
         fm.condwrite(not search, b'name', namefmt, name)
         fm.condwrite(not ui.quiet, b'url', b'%s\n', hidepassword(path.rawloc))
         for subopt, value in sorted(path.suboptions.items()):
             assert subopt not in (b'name', b'url')
             if showsubopts:
                 fm.plain(b'%s:%s = ' % (name, subopt))
             fm.condwrite(showsubopts, subopt, b'%s\n', value)
 
     fm.end()
 
     if search and not pathitems:
         if not ui.quiet:
             ui.warn(_(b"not found!\n"))
         return 1
     else:
         return 0
 
 
 @command(
     b'phase',
     [
         (b'p', b'public', False, _(b'set changeset phase to public')),
         (b'd', b'draft', False, _(b'set changeset phase to draft')),
         (b's', b'secret', False, _(b'set changeset phase to secret')),
         (b'f', b'force', False, _(b'allow to move boundary backward')),
         (b'r', b'rev', [], _(b'target revision'), _(b'REV')),
     ],
     _(b'[-p|-d|-s] [-f] [-r] [REV...]'),
     helpcategory=command.CATEGORY_CHANGE_ORGANIZATION,
 )
 def phase(ui, repo, *revs, **opts):
     """set or show the current phase name
 
     With no argument, show the phase name of the current revision(s).
 
     With one of -p/--public, -d/--draft or -s/--secret, change the
     phase value of the specified revisions.
 
     Unless -f/--force is specified, :hg:`phase` won't move changesets from a
     lower phase to a higher phase. Phases are ordered as follows::
 
         public < draft < secret
 
     Returns 0 on success, 1 if some phases could not be changed.
 
     (For more information about the phases concept, see :hg:`help phases`.)
     """
     opts = pycompat.byteskwargs(opts)
     # search for a unique phase argument
     targetphase = None
     for idx, name in enumerate(phases.cmdphasenames):
         if opts[name]:
             if targetphase is not None:
                 raise error.Abort(_(b'only one phase can be specified'))
             targetphase = idx
 
     # look for specified revision
     revs = list(revs)
     revs.extend(opts[b'rev'])
     if not revs:
         # display both parents as the second parent phase can influence
         # the phase of a merge commit
         revs = [c.rev() for c in repo[None].parents()]
 
     revs = scmutil.revrange(repo, revs)
 
     ret = 0
     if targetphase is None:
         # display
         for r in revs:
             ctx = repo[r]
             ui.write(b'%i: %s\n' % (ctx.rev(), ctx.phasestr()))
     else:
         with repo.lock(), repo.transaction(b"phase") as tr:
             # set phase
             if not revs:
                 raise error.Abort(_(b'empty revision set'))
             nodes = [repo[r].node() for r in revs]
             # moving revision from public to draft may hide them
             # We have to check result on an unfiltered repository
             unfi = repo.unfiltered()
             getphase = unfi._phasecache.phase
             olddata = [getphase(unfi, r) for r in unfi]
             phases.advanceboundary(repo, tr, targetphase, nodes)
             if opts[b'force']:
                 phases.retractboundary(repo, tr, targetphase, nodes)
         getphase = unfi._phasecache.phase
         newdata = [getphase(unfi, r) for r in unfi]
         changes = sum(newdata[r] != olddata[r] for r in unfi)
         cl = unfi.changelog
         rejected = [n for n in nodes if newdata[cl.rev(n)] < targetphase]
         if rejected:
             ui.warn(
                 _(
                     b'cannot move %i changesets to a higher '
                     b'phase, use --force\n'
                 )
                 % len(rejected)
             )
             ret = 1
         if changes:
             msg = _(b'phase changed for %i changesets\n') % changes
             if ret:
                 ui.status(msg)
             else:
                 ui.note(msg)
         else:
             ui.warn(_(b'no phases changed\n'))
     return ret
 
 
 def postincoming(ui, repo, modheads, optupdate, checkout, brev):
     """Run after a changegroup has been added via pull/unbundle
 
     This takes arguments below:
 
     :modheads: change of heads by pull/unbundle
     :optupdate: updating working directory is needed or not
     :checkout: update destination revision (or None to default destination)
     :brev: a name, which might be a bookmark to be activated after updating
     """
     if modheads == 0:
         return
     if optupdate:
         try:
             return hg.updatetotally(ui, repo, checkout, brev)
         except error.UpdateAbort as inst:
             msg = _(b"not updating: %s") % stringutil.forcebytestr(inst)
             hint = inst.hint
             raise error.UpdateAbort(msg, hint=hint)
     if modheads is not None and modheads > 1:
         currentbranchheads = len(repo.branchheads())
         if currentbranchheads == modheads:
             ui.status(
                 _(b"(run 'hg heads' to see heads, 'hg merge' to merge)\n")
             )
         elif currentbranchheads > 1:
             ui.status(
                 _(b"(run 'hg heads .' to see heads, 'hg merge' to merge)\n")
             )
         else:
             ui.status(_(b"(run 'hg heads' to see heads)\n"))
     elif not ui.configbool(b'commands', b'update.requiredest'):
         ui.status(_(b"(run 'hg update' to get a working copy)\n"))
 
 
 @command(
     b'pull',
     [
         (
             b'u',
             b'update',
             None,
             _(b'update to new branch head if new descendants were pulled'),
         ),
         (
             b'f',
             b'force',
             None,
             _(b'run even when remote repository is unrelated'),
         ),
         (b'', b'confirm', None, _(b'confirm pull before applying changes'),),
         (
             b'r',
             b'rev',
             [],
             _(b'a remote changeset intended to be added'),
             _(b'REV'),
         ),
         (b'B', b'bookmark', [], _(b"bookmark to pull"), _(b'BOOKMARK')),
         (
             b'b',
             b'branch',
             [],
             _(b'a specific branch you would like to pull'),
             _(b'BRANCH'),
         ),
     ]
     + remoteopts,
     _(b'[-u] [-f] [-r REV]... [-e CMD] [--remotecmd CMD] [SOURCE]'),
     helpcategory=command.CATEGORY_REMOTE_REPO_MANAGEMENT,
     helpbasic=True,
 )
 def pull(ui, repo, source=b"default", **opts):
     """pull changes from the specified source
 
     Pull changes from a remote repository to a local one.
 
     This finds all changes from the repository at the specified path
     or URL and adds them to a local repository (the current one unless
     -R is specified). By default, this does not update the copy of the
     project in the working directory.
 
     When cloning from servers that support it, Mercurial may fetch
     pre-generated data. When this is done, hooks operating on incoming
     changesets and changegroups may fire more than once, once for each
     pre-generated bundle and as well as for any additional remaining
     data. See :hg:`help -e clonebundles` for more.
 
     Use :hg:`incoming` if you want to see what would have been added
     by a pull at the time you issued this command. If you then decide
     to add those changes to the repository, you should use :hg:`pull
     -r X` where ``X`` is the last changeset listed by :hg:`incoming`.
 
     If SOURCE is omitted, the 'default' path will be used.
     See :hg:`help urls` for more information.
 
     Specifying bookmark as ``.`` is equivalent to specifying the active
     bookmark's name.
 
     Returns 0 on success, 1 if an update had unresolved files.
     """
 
     opts = pycompat.byteskwargs(opts)
     if ui.configbool(b'commands', b'update.requiredest') and opts.get(
         b'update'
     ):
         msg = _(b'update destination required by configuration')
         hint = _(b'use hg pull followed by hg update DEST')
         raise error.Abort(msg, hint=hint)
 
     source, branches = hg.parseurl(ui.expandpath(source), opts.get(b'branch'))
     ui.status(_(b'pulling from %s\n') % util.hidepassword(source))
     other = hg.peer(repo, opts, source)
     try:
         revs, checkout = hg.addbranchrevs(
             repo, other, branches, opts.get(b'rev')
         )
 
         pullopargs = {}
 
         nodes = None
         if opts.get(b'bookmark') or revs:
             # The list of bookmark used here is the same used to actually update
             # the bookmark names, to avoid the race from issue 4689 and we do
             # all lookup and bookmark queries in one go so they see the same
             # version of the server state (issue 4700).
             nodes = []
             fnodes = []
             revs = revs or []
             if revs and not other.capable(b'lookup'):
                 err = _(
                     b"other repository doesn't support revision lookup, "
                     b"so a rev cannot be specified."
                 )
                 raise error.Abort(err)
             with other.commandexecutor() as e:
                 fremotebookmarks = e.callcommand(
                     b'listkeys', {b'namespace': b'bookmarks'}
                 )
                 for r in revs:
                     fnodes.append(e.callcommand(b'lookup', {b'key': r}))
             remotebookmarks = fremotebookmarks.result()
             remotebookmarks = bookmarks.unhexlifybookmarks(remotebookmarks)
             pullopargs[b'remotebookmarks'] = remotebookmarks
             for b in opts.get(b'bookmark', []):
                 b = repo._bookmarks.expandname(b)
                 if b not in remotebookmarks:
                     raise error.Abort(_(b'remote bookmark %s not found!') % b)
                 nodes.append(remotebookmarks[b])
             for i, rev in enumerate(revs):
                 node = fnodes[i].result()
                 nodes.append(node)
                 if rev == checkout:
                     checkout = node
 
         wlock = util.nullcontextmanager()
         if opts.get(b'update'):
             wlock = repo.wlock()
         with wlock:
             pullopargs.update(opts.get(b'opargs', {}))
             modheads = exchange.pull(
                 repo,
                 other,
                 heads=nodes,
                 force=opts.get(b'force'),
                 bookmarks=opts.get(b'bookmark', ()),
                 opargs=pullopargs,
                 confirm=opts.get(b'confirm'),
             ).cgresult
 
             # brev is a name, which might be a bookmark to be activated at
             # the end of the update. In other words, it is an explicit
             # destination of the update
             brev = None
 
             if checkout:
                 checkout = repo.unfiltered().changelog.rev(checkout)
 
                 # order below depends on implementation of
                 # hg.addbranchrevs(). opts['bookmark'] is ignored,
                 # because 'checkout' is determined without it.
                 if opts.get(b'rev'):
                     brev = opts[b'rev'][0]
                 elif opts.get(b'branch'):
                     brev = opts[b'branch'][0]
                 else:
                     brev = branches[0]
             repo._subtoppath = source
             try:
                 ret = postincoming(
                     ui, repo, modheads, opts.get(b'update'), checkout, brev
                 )
             except error.FilteredRepoLookupError as exc:
                 msg = _(b'cannot update to target: %s') % exc.args[0]
                 exc.args = (msg,) + exc.args[1:]
                 raise
             finally:
                 del repo._subtoppath
 
     finally:
         other.close()
     return ret
 
 
 @command(
     b'push',
     [
         (b'f', b'force', None, _(b'force push')),
         (
             b'r',
             b'rev',
             [],
             _(b'a changeset intended to be included in the destination'),
             _(b'REV'),
         ),
         (b'B', b'bookmark', [], _(b"bookmark to push"), _(b'BOOKMARK')),
         (
             b'b',
             b'branch',
             [],
             _(b'a specific branch you would like to push'),
             _(b'BRANCH'),
         ),
         (b'', b'new-branch', False, _(b'allow pushing a new branch')),
         (
             b'',
             b'pushvars',
             [],
             _(b'variables that can be sent to server (ADVANCED)'),
         ),
         (
             b'',
             b'publish',
             False,
             _(b'push the changeset as public (EXPERIMENTAL)'),
         ),
     ]
     + remoteopts,
     _(b'[-f] [-r REV]... [-e CMD] [--remotecmd CMD] [DEST]'),
     helpcategory=command.CATEGORY_REMOTE_REPO_MANAGEMENT,
     helpbasic=True,
 )
 def push(ui, repo, dest=None, **opts):
     """push changes to the specified destination
 
     Push changesets from the local repository to the specified
     destination.
 
     This operation is symmetrical to pull: it is identical to a pull
     in the destination repository from the current one.
 
     By default, push will not allow creation of new heads at the
     destination, since multiple heads would make it unclear which head
     to use. In this situation, it is recommended to pull and merge
     before pushing.
 
     Use --new-branch if you want to allow push to create a new named
     branch that is not present at the destination. This allows you to
     only create a new branch without forcing other changes.
 
     .. note::
 
        Extra care should be taken with the -f/--force option,
        which will push all new heads on all branches, an action which will
        almost always cause confusion for collaborators.
 
     If -r/--rev is used, the specified revision and all its ancestors
     will be pushed to the remote repository.
 
     If -B/--bookmark is used, the specified bookmarked revision, its
     ancestors, and the bookmark will be pushed to the remote
     repository. Specifying ``.`` is equivalent to specifying the active
     bookmark's name.
 
     Please see :hg:`help urls` for important details about ``ssh://``
     URLs. If DESTINATION is omitted, a default path will be used.
 
     .. container:: verbose
 
         The --pushvars option sends strings to the server that become
         environment variables prepended with ``HG_USERVAR_``. For example,
         ``--pushvars ENABLE_FEATURE=true``, provides the server side hooks with
         ``HG_USERVAR_ENABLE_FEATURE=true`` as part of their environment.
 
         pushvars can provide for user-overridable hooks as well as set debug
         levels. One example is having a hook that blocks commits containing
         conflict markers, but enables the user to override the hook if the file
         is using conflict markers for testing purposes or the file format has
         strings that look like conflict markers.
 
         By default, servers will ignore `--pushvars`. To enable it add the
         following to your configuration file::
 
             [push]
             pushvars.server = true
 
     Returns 0 if push was successful, 1 if nothing to push.
     """
 
     opts = pycompat.byteskwargs(opts)
     if opts.get(b'bookmark'):
         ui.setconfig(b'bookmarks', b'pushing', opts[b'bookmark'], b'push')
         for b in opts[b'bookmark']:
             # translate -B options to -r so changesets get pushed
             b = repo._bookmarks.expandname(b)
             if b in repo._bookmarks:
                 opts.setdefault(b'rev', []).append(b)
             else:
                 # if we try to push a deleted bookmark, translate it to null
                 # this lets simultaneous -r, -b options continue working
                 opts.setdefault(b'rev', []).append(b"null")
 
     path = ui.paths.getpath(dest, default=(b'default-push', b'default'))
     if not path:
         raise error.Abort(
             _(b'default repository not configured!'),
             hint=_(b"see 'hg help config.paths'"),
         )
     dest = path.pushloc or path.loc
     branches = (path.branch, opts.get(b'branch') or [])
     ui.status(_(b'pushing to %s\n') % util.hidepassword(dest))
     revs, checkout = hg.addbranchrevs(repo, repo, branches, opts.get(b'rev'))
     other = hg.peer(repo, opts, dest)
 
     if revs:
         revs = [repo[r].node() for r in scmutil.revrange(repo, revs)]
         if not revs:
             raise error.Abort(
                 _(b"specified revisions evaluate to an empty set"),
                 hint=_(b"use different revision arguments"),
             )
     elif path.pushrev:
         # It doesn't make any sense to specify ancestor revisions. So limit
         # to DAG heads to make discovery simpler.
         expr = revsetlang.formatspec(b'heads(%r)', path.pushrev)
         revs = scmutil.revrange(repo, [expr])
         revs = [repo[rev].node() for rev in revs]
         if not revs:
             raise error.Abort(
                 _(b'default push revset for path evaluates to an empty set')
             )
     elif ui.configbool(b'commands', b'push.require-revs'):
         raise error.Abort(
             _(b'no revisions specified to push'),
             hint=_(b'did you mean "hg push -r ."?'),
         )
 
     repo._subtoppath = dest
     try:
         # push subrepos depth-first for coherent ordering
         c = repo[b'.']
         subs = c.substate  # only repos that are committed
         for s in sorted(subs):
             result = c.sub(s).push(opts)
             if result == 0:
                 return not result
     finally:
         del repo._subtoppath
 
     opargs = dict(opts.get(b'opargs', {}))  # copy opargs since we may mutate it
     opargs.setdefault(b'pushvars', []).extend(opts.get(b'pushvars', []))
 
     pushop = exchange.push(
         repo,
         other,
         opts.get(b'force'),
         revs=revs,
         newbranch=opts.get(b'new_branch'),
         bookmarks=opts.get(b'bookmark', ()),
         publish=opts.get(b'publish'),
         opargs=opargs,
     )
 
     result = not pushop.cgresult
 
     if pushop.bkresult is not None:
         if pushop.bkresult == 2:
             result = 2
         elif not result and pushop.bkresult:
             result = 2
 
     return result
 
 
 @command(
     b'recover',
     [(b'', b'verify', False, b"run `hg verify` after successful recover"),],
     helpcategory=command.CATEGORY_MAINTENANCE,
 )
 def recover(ui, repo, **opts):
     """roll back an interrupted transaction
 
     Recover from an interrupted commit or pull.
 
     This command tries to fix the repository status after an
     interrupted operation. It should only be necessary when Mercurial
     suggests it.
 
     Returns 0 if successful, 1 if nothing to recover or verify fails.
     """
     ret = repo.recover()
     if ret:
         if opts['verify']:
             return hg.verify(repo)
         else:
             msg = _(
                 b"(verify step skipped, run `hg verify` to check your "
                 b"repository content)\n"
             )
             ui.warn(msg)
             return 0
     return 1
 
 
 @command(
     b'remove|rm',
     [
         (b'A', b'after', None, _(b'record delete for missing files')),
         (b'f', b'force', None, _(b'forget added files, delete modified files')),
     ]
     + subrepoopts
     + walkopts
     + dryrunopts,
     _(b'[OPTION]... FILE...'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
     helpbasic=True,
     inferrepo=True,
 )
 def remove(ui, repo, *pats, **opts):
     """remove the specified files on the next commit
 
     Schedule the indicated files for removal from the current branch.
 
     This command schedules the files to be removed at the next commit.
     To undo a remove before that, see :hg:`revert`. To undo added
     files, see :hg:`forget`.
 
     .. container:: verbose
 
       -A/--after can be used to remove only files that have already
       been deleted, -f/--force can be used to force deletion, and -Af
       can be used to remove files from the next revision without
       deleting them from the working directory.
 
       The following table details the behavior of remove for different
       file states (columns) and option combinations (rows). The file
       states are Added [A], Clean [C], Modified [M] and Missing [!]
       (as reported by :hg:`status`). The actions are Warn, Remove
       (from branch) and Delete (from disk):
 
       ========= == == == ==
       opt/state A  C  M  !
       ========= == == == ==
       none      W  RD W  R
       -f        R  RD RD R
       -A        W  W  W  R
       -Af       R  R  R  R
       ========= == == == ==
 
       .. note::
 
          :hg:`remove` never deletes files in Added [A] state from the
          working directory, not even if ``--force`` is specified.
 
     Returns 0 on success, 1 if any warnings encountered.
     """
 
     opts = pycompat.byteskwargs(opts)
     after, force = opts.get(b'after'), opts.get(b'force')
     dryrun = opts.get(b'dry_run')
     if not pats and not after:
         raise error.Abort(_(b'no files specified'))
 
     m = scmutil.match(repo[None], pats, opts)
     subrepos = opts.get(b'subrepos')
     uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True)
     return cmdutil.remove(
         ui, repo, m, b"", uipathfn, after, force, subrepos, dryrun=dryrun
     )
 
 
 @command(
     b'rename|move|mv',
     [
         (b'A', b'after', None, _(b'record a rename that has already occurred')),
         (
             b'f',
             b'force',
             None,
             _(b'forcibly move over an existing managed file'),
         ),
     ]
     + walkopts
     + dryrunopts,
     _(b'[OPTION]... SOURCE... DEST'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
 )
 def rename(ui, repo, *pats, **opts):
     """rename files; equivalent of copy + remove
 
     Mark dest as copies of sources; mark sources for deletion. If dest
     is a directory, copies are put in that directory. If dest is a
     file, there can only be one source.
 
     By default, this command copies the contents of files as they
     exist in the working directory. If invoked with -A/--after, the
     operation is recorded, but no copying is performed.
 
     This command takes effect at the next commit. To undo a rename
     before that, see :hg:`revert`.
 
     Returns 0 on success, 1 if errors are encountered.
     """
     opts = pycompat.byteskwargs(opts)
     with repo.wlock(False):
         return cmdutil.copy(ui, repo, pats, opts, rename=True)
 
 
 @command(
     b'resolve',
     [
         (b'a', b'all', None, _(b'select all unresolved files')),
         (b'l', b'list', None, _(b'list state of files needing merge')),
         (b'm', b'mark', None, _(b'mark files as resolved')),
         (b'u', b'unmark', None, _(b'mark files as unresolved')),
         (b'n', b'no-status', None, _(b'hide status prefix')),
         (b'', b're-merge', None, _(b're-merge files')),
     ]
     + mergetoolopts
     + walkopts
     + formatteropts,
     _(b'[OPTION]... [FILE]...'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
     inferrepo=True,
 )
 def resolve(ui, repo, *pats, **opts):
     """redo merges or set/view the merge status of files
 
     Merges with unresolved conflicts are often the result of
     non-interactive merging using the ``internal:merge`` configuration
     setting, or a command-line merge tool like ``diff3``. The resolve
     command is used to manage the files involved in a merge, after
     :hg:`merge` has been run, and before :hg:`commit` is run (i.e. the
     working directory must have two parents). See :hg:`help
     merge-tools` for information on configuring merge tools.
 
     The resolve command can be used in the following ways:
 
     - :hg:`resolve [--re-merge] [--tool TOOL] FILE...`: attempt to re-merge
       the specified files, discarding any previous merge attempts. Re-merging
       is not performed for files already marked as resolved. Use ``--all/-a``
       to select all unresolved files. ``--tool`` can be used to specify
       the merge tool used for the given files. It overrides the HGMERGE
       environment variable and your configuration files.  Previous file
       contents are saved with a ``.orig`` suffix.
 
     - :hg:`resolve -m [FILE]`: mark a file as having been resolved
       (e.g. after having manually fixed-up the files). The default is
       to mark all unresolved files.
 
     - :hg:`resolve -u [FILE]...`: mark a file as unresolved. The
       default is to mark all resolved files.
 
     - :hg:`resolve -l`: list files which had or still have conflicts.
       In the printed list, ``U`` = unresolved and ``R`` = resolved.
       You can use ``set:unresolved()`` or ``set:resolved()`` to filter
       the list. See :hg:`help filesets` for details.
 
     .. note::
 
        Mercurial will not let you commit files with unresolved merge
        conflicts. You must use :hg:`resolve -m ...` before you can
        commit after a conflicting merge.
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported in addition to the common template
       keywords and functions. See also :hg:`help templates`.
 
       :mergestatus: String. Character denoting merge conflicts, ``U`` or ``R``.
       :path:    String. Repository-absolute path of the file.
 
     Returns 0 on success, 1 if any files fail a resolve attempt.
     """
 
     opts = pycompat.byteskwargs(opts)
     confirm = ui.configbool(b'commands', b'resolve.confirm')
     flaglist = b'all mark unmark list no_status re_merge'.split()
     all, mark, unmark, show, nostatus, remerge = [opts.get(o) for o in flaglist]
 
     actioncount = len(list(filter(None, [show, mark, unmark, remerge])))
     if actioncount > 1:
         raise error.Abort(_(b"too many actions specified"))
     elif actioncount == 0 and ui.configbool(
         b'commands', b'resolve.explicit-re-merge'
     ):
         hint = _(b'use --mark, --unmark, --list or --re-merge')
         raise error.Abort(_(b'no action specified'), hint=hint)
     if pats and all:
         raise error.Abort(_(b"can't specify --all and patterns"))
     if not (all or pats or show or mark or unmark):
         raise error.Abort(
             _(b'no files or directories specified'),
             hint=b'use --all to re-merge all unresolved files',
         )
 
     if confirm:
         if all:
             if ui.promptchoice(
                 _(b're-merge all unresolved files (yn)?$$ &Yes $$ &No')
             ):
                 raise error.Abort(_(b'user quit'))
         if mark and not pats:
             if ui.promptchoice(
                 _(
                     b'mark all unresolved files as resolved (yn)?'
                     b'$$ &Yes $$ &No'
                 )
             ):
                 raise error.Abort(_(b'user quit'))
         if unmark and not pats:
             if ui.promptchoice(
                 _(
                     b'mark all resolved files as unresolved (yn)?'
                     b'$$ &Yes $$ &No'
                 )
             ):
                 raise error.Abort(_(b'user quit'))
 
     uipathfn = scmutil.getuipathfn(repo)
 
     if show:
         ui.pager(b'resolve')
         fm = ui.formatter(b'resolve', opts)
         ms = mergemod.mergestate.read(repo)
         wctx = repo[None]
         m = scmutil.match(wctx, pats, opts)
 
         # Labels and keys based on merge state.  Unresolved path conflicts show
         # as 'P'.  Resolved path conflicts show as 'R', the same as normal
         # resolved conflicts.
         mergestateinfo = {
             mergemod.MERGE_RECORD_UNRESOLVED: (b'resolve.unresolved', b'U'),
             mergemod.MERGE_RECORD_RESOLVED: (b'resolve.resolved', b'R'),
             mergemod.MERGE_RECORD_UNRESOLVED_PATH: (
                 b'resolve.unresolved',
                 b'P',
             ),
             mergemod.MERGE_RECORD_RESOLVED_PATH: (b'resolve.resolved', b'R'),
             mergemod.MERGE_RECORD_DRIVER_RESOLVED: (
                 b'resolve.driverresolved',
                 b'D',
             ),
         }
 
         for f in ms:
             if not m(f):
                 continue
 
+            if ms[f] == mergemod.MERGE_RECORD_MERGED_OTHER:
+                continue
             label, key = mergestateinfo[ms[f]]
             fm.startitem()
             fm.context(ctx=wctx)
             fm.condwrite(not nostatus, b'mergestatus', b'%s ', key, label=label)
             fm.data(path=f)
             fm.plain(b'%s\n' % uipathfn(f), label=label)
         fm.end()
         return 0
 
     with repo.wlock():
         ms = mergemod.mergestate.read(repo)
 
         if not (ms.active() or repo.dirstate.p2() != nullid):
             raise error.Abort(
                 _(b'resolve command not applicable when not merging')
             )
 
         wctx = repo[None]
 
         if (
             ms.mergedriver
             and ms.mdstate() == mergemod.MERGE_DRIVER_STATE_UNMARKED
         ):
             proceed = mergemod.driverpreprocess(repo, ms, wctx)
             ms.commit()
             # allow mark and unmark to go through
             if not mark and not unmark and not proceed:
                 return 1
 
         m = scmutil.match(wctx, pats, opts)
         ret = 0
         didwork = False
         runconclude = False
 
         tocomplete = []
         hasconflictmarkers = []
         if mark:
             markcheck = ui.config(b'commands', b'resolve.mark-check')
             if markcheck not in [b'warn', b'abort']:
                 # Treat all invalid / unrecognized values as 'none'.
                 markcheck = False
         for f in ms:
             if not m(f):
                 continue
 
             didwork = True
 
+            if ms[f] == mergemod.MERGE_RECORD_MERGED_OTHER:
+                continue
+
             # don't let driver-resolved files be marked, and run the conclude
             # step if asked to resolve
             if ms[f] == mergemod.MERGE_RECORD_DRIVER_RESOLVED:
                 exact = m.exact(f)
                 if mark:
                     if exact:
                         ui.warn(
                             _(b'not marking %s as it is driver-resolved\n')
                             % uipathfn(f)
                         )
                 elif unmark:
                     if exact:
                         ui.warn(
                             _(b'not unmarking %s as it is driver-resolved\n')
                             % uipathfn(f)
                         )
                 else:
                     runconclude = True
                 continue
 
             # path conflicts must be resolved manually
             if ms[f] in (
                 mergemod.MERGE_RECORD_UNRESOLVED_PATH,
                 mergemod.MERGE_RECORD_RESOLVED_PATH,
             ):
                 if mark:
                     ms.mark(f, mergemod.MERGE_RECORD_RESOLVED_PATH)
                 elif unmark:
                     ms.mark(f, mergemod.MERGE_RECORD_UNRESOLVED_PATH)
                 elif ms[f] == mergemod.MERGE_RECORD_UNRESOLVED_PATH:
                     ui.warn(
                         _(b'%s: path conflict must be resolved manually\n')
                         % uipathfn(f)
                     )
                 continue
 
             if mark:
                 if markcheck:
                     fdata = repo.wvfs.tryread(f)
                     if (
                         filemerge.hasconflictmarkers(fdata)
                         and ms[f] != mergemod.MERGE_RECORD_RESOLVED
                     ):
                         hasconflictmarkers.append(f)
                 ms.mark(f, mergemod.MERGE_RECORD_RESOLVED)
             elif unmark:
                 ms.mark(f, mergemod.MERGE_RECORD_UNRESOLVED)
             else:
                 # backup pre-resolve (merge uses .orig for its own purposes)
                 a = repo.wjoin(f)
                 try:
                     util.copyfile(a, a + b".resolve")
                 except (IOError, OSError) as inst:
                     if inst.errno != errno.ENOENT:
                         raise
 
                 try:
                     # preresolve file
                     overrides = {(b'ui', b'forcemerge'): opts.get(b'tool', b'')}
                     with ui.configoverride(overrides, b'resolve'):
                         complete, r = ms.preresolve(f, wctx)
                     if not complete:
                         tocomplete.append(f)
                     elif r:
                         ret = 1
                 finally:
                     ms.commit()
 
                 # replace filemerge's .orig file with our resolve file, but only
                 # for merges that are complete
                 if complete:
                     try:
                         util.rename(
                             a + b".resolve", scmutil.backuppath(ui, repo, f)
                         )
                     except OSError as inst:
                         if inst.errno != errno.ENOENT:
                             raise
 
         if hasconflictmarkers:
             ui.warn(
                 _(
                     b'warning: the following files still have conflict '
                     b'markers:\n'
                 )
                 + b''.join(
                     b'  ' + uipathfn(f) + b'\n' for f in hasconflictmarkers
                 )
             )
             if markcheck == b'abort' and not all and not pats:
                 raise error.Abort(
                     _(b'conflict markers detected'),
                     hint=_(b'use --all to mark anyway'),
                 )
 
         for f in tocomplete:
             try:
                 # resolve file
                 overrides = {(b'ui', b'forcemerge'): opts.get(b'tool', b'')}
                 with ui.configoverride(overrides, b'resolve'):
                     r = ms.resolve(f, wctx)
                 if r:
                     ret = 1
             finally:
                 ms.commit()
 
             # replace filemerge's .orig file with our resolve file
             a = repo.wjoin(f)
             try:
                 util.rename(a + b".resolve", scmutil.backuppath(ui, repo, f))
             except OSError as inst:
                 if inst.errno != errno.ENOENT:
                     raise
 
         ms.commit()
         ms.recordactions()
 
         if not didwork and pats:
             hint = None
             if not any([p for p in pats if p.find(b':') >= 0]):
                 pats = [b'path:%s' % p for p in pats]
                 m = scmutil.match(wctx, pats, opts)
                 for f in ms:
                     if not m(f):
                         continue
 
                     def flag(o):
                         if o == b're_merge':
                             return b'--re-merge '
                         return b'-%s ' % o[0:1]
 
                     flags = b''.join([flag(o) for o in flaglist if opts.get(o)])
                     hint = _(b"(try: hg resolve %s%s)\n") % (
                         flags,
                         b' '.join(pats),
                     )
                     break
             ui.warn(_(b"arguments do not match paths that need resolving\n"))
             if hint:
                 ui.warn(hint)
         elif ms.mergedriver and ms.mdstate() != b's':
             # run conclude step when either a driver-resolved file is requested
             # or there are no driver-resolved files
             # we can't use 'ret' to determine whether any files are unresolved
             # because we might not have tried to resolve some
             if (runconclude or not list(ms.driverresolved())) and not list(
                 ms.unresolved()
             ):
                 proceed = mergemod.driverconclude(repo, ms, wctx)
                 ms.commit()
                 if not proceed:
                     return 1
 
     # Nudge users into finishing an unfinished operation
     unresolvedf = list(ms.unresolved())
     driverresolvedf = list(ms.driverresolved())
     if not unresolvedf and not driverresolvedf:
         ui.status(_(b'(no more unresolved files)\n'))
         cmdutil.checkafterresolved(repo)
     elif not unresolvedf:
         ui.status(
             _(
                 b'(no more unresolved files -- '
                 b'run "hg resolve --all" to conclude)\n'
             )
         )
 
     return ret
 
 
 @command(
     b'revert',
     [
         (b'a', b'all', None, _(b'revert all changes when no arguments given')),
         (b'd', b'date', b'', _(b'tipmost revision matching date'), _(b'DATE')),
         (b'r', b'rev', b'', _(b'revert to the specified revision'), _(b'REV')),
         (b'C', b'no-backup', None, _(b'do not save backup copies of files')),
         (b'i', b'interactive', None, _(b'interactively select the changes')),
     ]
     + walkopts
     + dryrunopts,
     _(b'[OPTION]... [-r REV] [NAME]...'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
 )
 def revert(ui, repo, *pats, **opts):
     """restore files to their checkout state
 
     .. note::
 
        To check out earlier revisions, you should use :hg:`update REV`.
        To cancel an uncommitted merge (and lose your changes),
        use :hg:`merge --abort`.
 
     With no revision specified, revert the specified files or directories
     to the contents they had in the parent of the working directory.
     This restores the contents of files to an unmodified
     state and unschedules adds, removes, copies, and renames. If the
     working directory has two parents, you must explicitly specify a
     revision.
 
     Using the -r/--rev or -d/--date options, revert the given files or
     directories to their states as of a specific revision. Because
     revert does not change the working directory parents, this will
     cause these files to appear modified. This can be helpful to "back
     out" some or all of an earlier change. See :hg:`backout` for a
     related method.
 
     Modified files are saved with a .orig suffix before reverting.
     To disable these backups, use --no-backup. It is possible to store
     the backup files in a custom directory relative to the root of the
     repository by setting the ``ui.origbackuppath`` configuration
     option.
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     See :hg:`help backout` for a way to reverse the effect of an
     earlier changeset.
 
     Returns 0 on success.
     """
 
     opts = pycompat.byteskwargs(opts)
     if opts.get(b"date"):
         if opts.get(b"rev"):
             raise error.Abort(_(b"you can't specify a revision and a date"))
         opts[b"rev"] = cmdutil.finddate(ui, repo, opts[b"date"])
 
     parent, p2 = repo.dirstate.parents()
     if not opts.get(b'rev') and p2 != nullid:
         # revert after merge is a trap for new users (issue2915)
         raise error.Abort(
             _(b'uncommitted merge with no revision specified'),
             hint=_(b"use 'hg update' or see 'hg help revert'"),
         )
 
     rev = opts.get(b'rev')
     if rev:
         repo = scmutil.unhidehashlikerevs(repo, [rev], b'nowarn')
     ctx = scmutil.revsingle(repo, rev)
 
     if not (
         pats
         or opts.get(b'include')
         or opts.get(b'exclude')
         or opts.get(b'all')
         or opts.get(b'interactive')
     ):
         msg = _(b"no files or directories specified")
         if p2 != nullid:
             hint = _(
                 b"uncommitted merge, use --all to discard all changes,"
                 b" or 'hg update -C .' to abort the merge"
             )
             raise error.Abort(msg, hint=hint)
         dirty = any(repo.status())
         node = ctx.node()
         if node != parent:
             if dirty:
                 hint = (
                     _(
                         b"uncommitted changes, use --all to discard all"
                         b" changes, or 'hg update %d' to update"
                     )
                     % ctx.rev()
                 )
             else:
                 hint = (
                     _(
                         b"use --all to revert all files,"
                         b" or 'hg update %d' to update"
                     )
                     % ctx.rev()
                 )
         elif dirty:
             hint = _(b"uncommitted changes, use --all to discard all changes")
         else:
             hint = _(b"use --all to revert all files")
         raise error.Abort(msg, hint=hint)
 
     return cmdutil.revert(
         ui, repo, ctx, (parent, p2), *pats, **pycompat.strkwargs(opts)
     )
 
 
 @command(
     b'rollback',
     dryrunopts + [(b'f', b'force', False, _(b'ignore safety measures'))],
     helpcategory=command.CATEGORY_MAINTENANCE,
 )
 def rollback(ui, repo, **opts):
     """roll back the last transaction (DANGEROUS) (DEPRECATED)
 
     Please use :hg:`commit --amend` instead of rollback to correct
     mistakes in the last commit.
 
     This command should be used with care. There is only one level of
     rollback, and there is no way to undo a rollback. It will also
     restore the dirstate at the time of the last transaction, losing
     any dirstate changes since that time. This command does not alter
     the working directory.
 
     Transactions are used to encapsulate the effects of all commands
     that create new changesets or propagate existing changesets into a
     repository.
 
     .. container:: verbose
 
       For example, the following commands are transactional, and their
       effects can be rolled back:
 
       - commit
       - import
       - pull
       - push (with this repository as the destination)
       - unbundle
 
       To avoid permanent data loss, rollback will refuse to rollback a
       commit transaction if it isn't checked out. Use --force to
       override this protection.
 
       The rollback command can be entirely disabled by setting the
       ``ui.rollback`` configuration setting to false. If you're here
       because you want to use rollback and it's disabled, you can
       re-enable the command by setting ``ui.rollback`` to true.
 
     This command is not intended for use on public repositories. Once
     changes are visible for pull by other users, rolling a transaction
     back locally is ineffective (someone else may already have pulled
     the changes). Furthermore, a race is possible with readers of the
     repository; for example an in-progress pull from the repository
     may fail if a rollback is performed.
 
     Returns 0 on success, 1 if no rollback data is available.
     """
     if not ui.configbool(b'ui', b'rollback'):
         raise error.Abort(
             _(b'rollback is disabled because it is unsafe'),
             hint=b'see `hg help -v rollback` for information',
         )
     return repo.rollback(dryrun=opts.get('dry_run'), force=opts.get('force'))
 
 
 @command(
     b'root',
     [] + formatteropts,
     intents={INTENT_READONLY},
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
 )
 def root(ui, repo, **opts):
     """print the root (top) of the current working directory
 
     Print the root directory of the current repository.
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported in addition to the common template
       keywords and functions. See also :hg:`help templates`.
 
       :hgpath:    String. Path to the .hg directory.
       :storepath: String. Path to the directory holding versioned data.
 
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
     with ui.formatter(b'root', opts) as fm:
         fm.startitem()
         fm.write(b'reporoot', b'%s\n', repo.root)
         fm.data(hgpath=repo.path, storepath=repo.spath)
 
 
 @command(
     b'serve',
     [
         (
             b'A',
             b'accesslog',
             b'',
             _(b'name of access log file to write to'),
             _(b'FILE'),
         ),
         (b'd', b'daemon', None, _(b'run server in background')),
         (b'', b'daemon-postexec', [], _(b'used internally by daemon mode')),
         (
             b'E',
             b'errorlog',
             b'',
             _(b'name of error log file to write to'),
             _(b'FILE'),
         ),
         # use string type, then we can check if something was passed
         (
             b'p',
             b'port',
             b'',
             _(b'port to listen on (default: 8000)'),
             _(b'PORT'),
         ),
         (
             b'a',
             b'address',
             b'',
             _(b'address to listen on (default: all interfaces)'),
             _(b'ADDR'),
         ),
         (
             b'',
             b'prefix',
             b'',
             _(b'prefix path to serve from (default: server root)'),
             _(b'PREFIX'),
         ),
         (
             b'n',
             b'name',
             b'',
             _(b'name to show in web pages (default: working directory)'),
             _(b'NAME'),
         ),
         (
             b'',
             b'web-conf',
             b'',
             _(b"name of the hgweb config file (see 'hg help hgweb')"),
             _(b'FILE'),
         ),
         (
             b'',
             b'webdir-conf',
             b'',
             _(b'name of the hgweb config file (DEPRECATED)'),
             _(b'FILE'),
         ),
         (
             b'',
             b'pid-file',
             b'',
             _(b'name of file to write process ID to'),
             _(b'FILE'),
         ),
         (b'', b'stdio', None, _(b'for remote clients (ADVANCED)')),
         (
             b'',
             b'cmdserver',
             b'',
             _(b'for remote clients (ADVANCED)'),
             _(b'MODE'),
         ),
         (b't', b'templates', b'', _(b'web templates to use'), _(b'TEMPLATE')),
         (b'', b'style', b'', _(b'template style to use'), _(b'STYLE')),
         (b'6', b'ipv6', None, _(b'use IPv6 in addition to IPv4')),
         (b'', b'certificate', b'', _(b'SSL certificate file'), _(b'FILE')),
         (b'', b'print-url', None, _(b'start and print only the URL')),
     ]
     + subrepoopts,
     _(b'[OPTION]...'),
     helpcategory=command.CATEGORY_REMOTE_REPO_MANAGEMENT,
     helpbasic=True,
     optionalrepo=True,
 )
 def serve(ui, repo, **opts):
     """start stand-alone webserver
 
     Start a local HTTP repository browser and pull server. You can use
     this for ad-hoc sharing and browsing of repositories. It is
     recommended to use a real web server to serve a repository for
     longer periods of time.
 
     Please note that the server does not implement access control.
     This means that, by default, anybody can read from the server and
     nobody can write to it by default. Set the ``web.allow-push``
     option to ``*`` to allow everybody to push to the server. You
     should use a real web server if you need to authenticate users.
 
     By default, the server logs accesses to stdout and errors to
     stderr. Use the -A/--accesslog and -E/--errorlog options to log to
     files.
 
     To have the server choose a free port number to listen on, specify
     a port number of 0; in this case, the server will print the port
     number it uses.
 
     Returns 0 on success.
     """
 
     opts = pycompat.byteskwargs(opts)
     if opts[b"stdio"] and opts[b"cmdserver"]:
         raise error.Abort(_(b"cannot use --stdio with --cmdserver"))
     if opts[b"print_url"] and ui.verbose:
         raise error.Abort(_(b"cannot use --print-url with --verbose"))
 
     if opts[b"stdio"]:
         if repo is None:
             raise error.RepoError(
                 _(b"there is no Mercurial repository here (.hg not found)")
             )
         s = wireprotoserver.sshserver(ui, repo)
         s.serve_forever()
 
     service = server.createservice(ui, repo, opts)
     return server.runservice(opts, initfn=service.init, runfn=service.run)
 
 
 @command(
     b'shelve',
     [
         (
             b'A',
             b'addremove',
             None,
             _(b'mark new/missing files as added/removed before shelving'),
         ),
         (b'u', b'unknown', None, _(b'store unknown files in the shelve')),
         (b'', b'cleanup', None, _(b'delete all shelved changes')),
         (
             b'',
             b'date',
             b'',
             _(b'shelve with the specified commit date'),
             _(b'DATE'),
         ),
         (b'd', b'delete', None, _(b'delete the named shelved change(s)')),
         (b'e', b'edit', False, _(b'invoke editor on commit messages')),
         (
             b'k',
             b'keep',
             False,
             _(b'shelve, but keep changes in the working directory'),
         ),
         (b'l', b'list', None, _(b'list current shelves')),
         (b'm', b'message', b'', _(b'use text as shelve message'), _(b'TEXT')),
         (
             b'n',
             b'name',
             b'',
             _(b'use the given name for the shelved commit'),
             _(b'NAME'),
         ),
         (
             b'p',
             b'patch',
             None,
             _(
                 b'output patches for changes (provide the names of the shelved '
                 b'changes as positional arguments)'
             ),
         ),
         (b'i', b'interactive', None, _(b'interactive mode')),
         (
             b'',
             b'stat',
             None,
             _(
                 b'output diffstat-style summary of changes (provide the names of '
                 b'the shelved changes as positional arguments)'
             ),
         ),
     ]
     + cmdutil.walkopts,
     _(b'hg shelve [OPTION]... [FILE]...'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
 )
 def shelve(ui, repo, *pats, **opts):
     '''save and set aside changes from the working directory
 
     Shelving takes files that "hg status" reports as not clean, saves
     the modifications to a bundle (a shelved change), and reverts the
     files so that their state in the working directory becomes clean.
 
     To restore these changes to the working directory, using "hg
     unshelve"; this will work even if you switch to a different
     commit.
 
     When no files are specified, "hg shelve" saves all not-clean
     files. If specific files or directories are named, only changes to
     those files are shelved.
 
     In bare shelve (when no files are specified, without interactive,
     include and exclude option), shelving remembers information if the
     working directory was on newly created branch, in other words working
     directory was on different branch than its first parent. In this
     situation unshelving restores branch information to the working directory.
 
     Each shelved change has a name that makes it easier to find later.
     The name of a shelved change defaults to being based on the active
     bookmark, or if there is no active bookmark, the current named
     branch.  To specify a different name, use ``--name``.
 
     To see a list of existing shelved changes, use the ``--list``
     option. For each shelved change, this will print its name, age,
     and description; use ``--patch`` or ``--stat`` for more details.
 
     To delete specific shelved changes, use ``--delete``. To delete
     all shelved changes, use ``--cleanup``.
     '''
     opts = pycompat.byteskwargs(opts)
     allowables = [
         (b'addremove', {b'create'}),  # 'create' is pseudo action
         (b'unknown', {b'create'}),
         (b'cleanup', {b'cleanup'}),
         #       ('date', {'create'}), # ignored for passing '--date "0 0"' in tests
         (b'delete', {b'delete'}),
         (b'edit', {b'create'}),
         (b'keep', {b'create'}),
         (b'list', {b'list'}),
         (b'message', {b'create'}),
         (b'name', {b'create'}),
         (b'patch', {b'patch', b'list'}),
         (b'stat', {b'stat', b'list'}),
     ]
 
     def checkopt(opt):
         if opts.get(opt):
             for i, allowable in allowables:
                 if opts[i] and opt not in allowable:
                     raise error.Abort(
                         _(
                             b"options '--%s' and '--%s' may not be "
                             b"used together"
                         )
                         % (opt, i)
                     )
             return True
 
     if checkopt(b'cleanup'):
         if pats:
             raise error.Abort(_(b"cannot specify names when using '--cleanup'"))
         return shelvemod.cleanupcmd(ui, repo)
     elif checkopt(b'delete'):
         return shelvemod.deletecmd(ui, repo, pats)
     elif checkopt(b'list'):
         return shelvemod.listcmd(ui, repo, pats, opts)
     elif checkopt(b'patch') or checkopt(b'stat'):
         return shelvemod.patchcmds(ui, repo, pats, opts)
     else:
         return shelvemod.createcmd(ui, repo, pats, opts)
 
 
 _NOTTERSE = b'nothing'
 
 
 @command(
     b'status|st',
     [
         (b'A', b'all', None, _(b'show status of all files')),
         (b'm', b'modified', None, _(b'show only modified files')),
         (b'a', b'added', None, _(b'show only added files')),
         (b'r', b'removed', None, _(b'show only removed files')),
         (b'd', b'deleted', None, _(b'show only deleted (but tracked) files')),
         (b'c', b'clean', None, _(b'show only files without changes')),
         (b'u', b'unknown', None, _(b'show only unknown (not tracked) files')),
         (b'i', b'ignored', None, _(b'show only ignored files')),
         (b'n', b'no-status', None, _(b'hide status prefix')),
         (b't', b'terse', _NOTTERSE, _(b'show the terse output (EXPERIMENTAL)')),
         (
             b'C',
             b'copies',
             None,
             _(b'show source of copied files (DEFAULT: ui.statuscopies)'),
         ),
         (
             b'0',
             b'print0',
             None,
             _(b'end filenames with NUL, for use with xargs'),
         ),
         (b'', b'rev', [], _(b'show difference from revision'), _(b'REV')),
         (
             b'',
             b'change',
             b'',
             _(b'list the changed files of a revision'),
             _(b'REV'),
         ),
     ]
     + walkopts
     + subrepoopts
     + formatteropts,
     _(b'[OPTION]... [FILE]...'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
     helpbasic=True,
     inferrepo=True,
     intents={INTENT_READONLY},
 )
 def status(ui, repo, *pats, **opts):
     """show changed files in the working directory
 
     Show status of files in the repository. If names are given, only
     files that match are shown. Files that are clean or ignored or
     the source of a copy/move operation, are not listed unless
     -c/--clean, -i/--ignored, -C/--copies or -A/--all are given.
     Unless options described with "show only ..." are given, the
     options -mardu are used.
 
     Option -q/--quiet hides untracked (unknown and ignored) files
     unless explicitly requested with -u/--unknown or -i/--ignored.
 
     .. note::
 
        :hg:`status` may appear to disagree with diff if permissions have
        changed or a merge has occurred. The standard diff format does
        not report permission changes and diff only reports changes
        relative to one merge parent.
 
     If one revision is given, it is used as the base revision.
     If two revisions are given, the differences between them are
     shown. The --change option can also be used as a shortcut to list
     the changed files of a revision from its first parent.
 
     The codes used to show the status of files are::
 
       M = modified
       A = added
       R = removed
       C = clean
       ! = missing (deleted by non-hg command, but still tracked)
       ? = not tracked
       I = ignored
         = origin of the previous file (with --copies)
 
     .. container:: verbose
 
       The -t/--terse option abbreviates the output by showing only the directory
       name if all the files in it share the same status. The option takes an
       argument indicating the statuses to abbreviate: 'm' for 'modified', 'a'
       for 'added', 'r' for 'removed', 'd' for 'deleted', 'u' for 'unknown', 'i'
       for 'ignored' and 'c' for clean.
 
       It abbreviates only those statuses which are passed. Note that clean and
       ignored files are not displayed with '--terse ic' unless the -c/--clean
       and -i/--ignored options are also used.
 
       The -v/--verbose option shows information when the repository is in an
       unfinished merge, shelve, rebase state etc. You can have this behavior
       turned on by default by enabling the ``commands.status.verbose`` option.
 
       You can skip displaying some of these states by setting
       ``commands.status.skipstates`` to one or more of: 'bisect', 'graft',
       'histedit', 'merge', 'rebase', or 'unshelve'.
 
       Template:
 
       The following keywords are supported in addition to the common template
       keywords and functions. See also :hg:`help templates`.
 
       :path:    String. Repository-absolute path of the file.
       :source:  String. Repository-absolute path of the file originated from.
                 Available if ``--copies`` is specified.
       :status:  String. Character denoting file's status.
 
       Examples:
 
       - show changes in the working directory relative to a
         changeset::
 
           hg status --rev 9353
 
       - show changes in the working directory relative to the
         current directory (see :hg:`help patterns` for more information)::
 
           hg status re:
 
       - show all changes including copies in an existing changeset::
 
           hg status --copies --change 9353
 
       - get a NUL separated list of added files, suitable for xargs::
 
           hg status -an0
 
       - show more information about the repository status, abbreviating
         added, removed, modified, deleted, and untracked paths::
 
           hg status -v -t mardu
 
     Returns 0 on success.
 
     """
 
     opts = pycompat.byteskwargs(opts)
     revs = opts.get(b'rev')
     change = opts.get(b'change')
     terse = opts.get(b'terse')
     if terse is _NOTTERSE:
         if revs:
             terse = b''
         else:
             terse = ui.config(b'commands', b'status.terse')
 
     if revs and change:
         msg = _(b'cannot specify --rev and --change at the same time')
         raise error.Abort(msg)
     elif revs and terse:
         msg = _(b'cannot use --terse with --rev')
         raise error.Abort(msg)
     elif change:
         repo = scmutil.unhidehashlikerevs(repo, [change], b'nowarn')
         ctx2 = scmutil.revsingle(repo, change, None)
         ctx1 = ctx2.p1()
     else:
         repo = scmutil.unhidehashlikerevs(repo, revs, b'nowarn')
         ctx1, ctx2 = scmutil.revpair(repo, revs)
 
     forcerelativevalue = None
     if ui.hasconfig(b'commands', b'status.relative'):
         forcerelativevalue = ui.configbool(b'commands', b'status.relative')
     uipathfn = scmutil.getuipathfn(
         repo,
         legacyrelativevalue=bool(pats),
         forcerelativevalue=forcerelativevalue,
     )
 
     if opts.get(b'print0'):
         end = b'\0'
     else:
         end = b'\n'
     states = b'modified added removed deleted unknown ignored clean'.split()
     show = [k for k in states if opts.get(k)]
     if opts.get(b'all'):
         show += ui.quiet and (states[:4] + [b'clean']) or states
 
     if not show:
         if ui.quiet:
             show = states[:4]
         else:
             show = states[:5]
 
     m = scmutil.match(ctx2, pats, opts)
     if terse:
         # we need to compute clean and unknown to terse
         stat = repo.status(
             ctx1.node(),
             ctx2.node(),
             m,
             b'ignored' in show or b'i' in terse,
             clean=True,
             unknown=True,
             listsubrepos=opts.get(b'subrepos'),
         )
 
         stat = cmdutil.tersedir(stat, terse)
     else:
         stat = repo.status(
             ctx1.node(),
             ctx2.node(),
             m,
             b'ignored' in show,
             b'clean' in show,
             b'unknown' in show,
             opts.get(b'subrepos'),
         )
 
     changestates = zip(
         states,
         pycompat.iterbytestr(b'MAR!?IC'),
         [getattr(stat, s.decode('utf8')) for s in states],
     )
 
     copy = {}
     if (
         opts.get(b'all')
         or opts.get(b'copies')
         or ui.configbool(b'ui', b'statuscopies')
     ) and not opts.get(b'no_status'):
         copy = copies.pathcopies(ctx1, ctx2, m)
 
     morestatus = None
     if (
         ui.verbose or ui.configbool(b'commands', b'status.verbose')
     ) and not ui.plain():
         morestatus = cmdutil.readmorestatus(repo)
 
     ui.pager(b'status')
     fm = ui.formatter(b'status', opts)
     fmt = b'%s' + end
     showchar = not opts.get(b'no_status')
 
     for state, char, files in changestates:
         if state in show:
             label = b'status.' + state
             for f in files:
                 fm.startitem()
                 fm.context(ctx=ctx2)
                 fm.data(itemtype=b'file', path=f)
                 fm.condwrite(showchar, b'status', b'%s ', char, label=label)
                 fm.plain(fmt % uipathfn(f), label=label)
                 if f in copy:
                     fm.data(source=copy[f])
                     fm.plain(
                         (b'  %s' + end) % uipathfn(copy[f]),
                         label=b'status.copied',
                     )
                 if morestatus:
                     morestatus.formatfile(f, fm)
 
     if morestatus:
         morestatus.formatfooter(fm)
     fm.end()
 
 
 @command(
     b'summary|sum',
     [(b'', b'remote', None, _(b'check for push and pull'))],
     b'[--remote]',
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
     helpbasic=True,
     intents={INTENT_READONLY},
 )
 def summary(ui, repo, **opts):
     """summarize working directory state
 
     This generates a brief summary of the working directory state,
     including parents, branch, commit status, phase and available updates.
 
     With the --remote option, this will check the default paths for
     incoming and outgoing changes. This can be time-consuming.
 
     Returns 0 on success.
     """
 
     opts = pycompat.byteskwargs(opts)
     ui.pager(b'summary')
     ctx = repo[None]
     parents = ctx.parents()
     pnode = parents[0].node()
     marks = []
 
     try:
         ms = mergemod.mergestate.read(repo)
     except error.UnsupportedMergeRecords as e:
         s = b' '.join(e.recordtypes)
         ui.warn(
             _(b'warning: merge state has unsupported record types: %s\n') % s
         )
         unresolved = []
     else:
         unresolved = list(ms.unresolved())
 
     for p in parents:
         # label with log.changeset (instead of log.parent) since this
         # shows a working directory parent *changeset*:
         # i18n: column positioning for "hg summary"
         ui.write(
             _(b'parent: %d:%s ') % (p.rev(), p),
             label=logcmdutil.changesetlabels(p),
         )
         ui.write(b' '.join(p.tags()), label=b'log.tag')
         if p.bookmarks():
             marks.extend(p.bookmarks())
         if p.rev() == -1:
             if not len(repo):
                 ui.write(_(b' (empty repository)'))
             else:
                 ui.write(_(b' (no revision checked out)'))
         if p.obsolete():
             ui.write(_(b' (obsolete)'))
         if p.isunstable():
             instabilities = (
                 ui.label(instability, b'trouble.%s' % instability)
                 for instability in p.instabilities()
             )
             ui.write(b' (' + b', '.join(instabilities) + b')')
         ui.write(b'\n')
         if p.description():
             ui.status(
                 b' ' + p.description().splitlines()[0].strip() + b'\n',
                 label=b'log.summary',
             )
 
     branch = ctx.branch()
     bheads = repo.branchheads(branch)
     # i18n: column positioning for "hg summary"
     m = _(b'branch: %s\n') % branch
     if branch != b'default':
         ui.write(m, label=b'log.branch')
     else:
         ui.status(m, label=b'log.branch')
 
     if marks:
         active = repo._activebookmark
         # i18n: column positioning for "hg summary"
         ui.write(_(b'bookmarks:'), label=b'log.bookmark')
         if active is not None:
             if active in marks:
                 ui.write(b' *' + active, label=bookmarks.activebookmarklabel)
                 marks.remove(active)
             else:
                 ui.write(b' [%s]' % active, label=bookmarks.activebookmarklabel)
         for m in marks:
             ui.write(b' ' + m, label=b'log.bookmark')
         ui.write(b'\n', label=b'log.bookmark')
 
     status = repo.status(unknown=True)
 
     c = repo.dirstate.copies()
     copied, renamed = [], []
     for d, s in pycompat.iteritems(c):
         if s in status.removed:
             status.removed.remove(s)
             renamed.append(d)
         else:
             copied.append(d)
         if d in status.added:
             status.added.remove(d)
 
     subs = [s for s in ctx.substate if ctx.sub(s).dirty()]
 
     labels = [
         (ui.label(_(b'%d modified'), b'status.modified'), status.modified),
         (ui.label(_(b'%d added'), b'status.added'), status.added),
         (ui.label(_(b'%d removed'), b'status.removed'), status.removed),
         (ui.label(_(b'%d renamed'), b'status.copied'), renamed),
         (ui.label(_(b'%d copied'), b'status.copied'), copied),
         (ui.label(_(b'%d deleted'), b'status.deleted'), status.deleted),
         (ui.label(_(b'%d unknown'), b'status.unknown'), status.unknown),
         (ui.label(_(b'%d unresolved'), b'resolve.unresolved'), unresolved),
         (ui.label(_(b'%d subrepos'), b'status.modified'), subs),
     ]
     t = []
     for l, s in labels:
         if s:
             t.append(l % len(s))
 
     t = b', '.join(t)
     cleanworkdir = False
 
     if repo.vfs.exists(b'graftstate'):
         t += _(b' (graft in progress)')
     if repo.vfs.exists(b'updatestate'):
         t += _(b' (interrupted update)')
     elif len(parents) > 1:
         t += _(b' (merge)')
     elif branch != parents[0].branch():
         t += _(b' (new branch)')
     elif parents[0].closesbranch() and pnode in repo.branchheads(
         branch, closed=True
     ):
         t += _(b' (head closed)')
     elif not (
         status.modified
         or status.added
         or status.removed
         or renamed
         or copied
         or subs
     ):
         t += _(b' (clean)')
         cleanworkdir = True
     elif pnode not in bheads:
         t += _(b' (new branch head)')
 
     if parents:
         pendingphase = max(p.phase() for p in parents)
     else:
         pendingphase = phases.public
 
     if pendingphase > phases.newcommitphase(ui):
         t += b' (%s)' % phases.phasenames[pendingphase]
 
     if cleanworkdir:
         # i18n: column positioning for "hg summary"
         ui.status(_(b'commit: %s\n') % t.strip())
     else:
         # i18n: column positioning for "hg summary"
         ui.write(_(b'commit: %s\n') % t.strip())
 
     # all ancestors of branch heads - all ancestors of parent = new csets
     new = len(
         repo.changelog.findmissing([pctx.node() for pctx in parents], bheads)
     )
 
     if new == 0:
         # i18n: column positioning for "hg summary"
         ui.status(_(b'update: (current)\n'))
     elif pnode not in bheads:
         # i18n: column positioning for "hg summary"
         ui.write(_(b'update: %d new changesets (update)\n') % new)
     else:
         # i18n: column positioning for "hg summary"
         ui.write(
             _(b'update: %d new changesets, %d branch heads (merge)\n')
             % (new, len(bheads))
         )
 
     t = []
     draft = len(repo.revs(b'draft()'))
     if draft:
         t.append(_(b'%d draft') % draft)
     secret = len(repo.revs(b'secret()'))
     if secret:
         t.append(_(b'%d secret') % secret)
 
     if draft or secret:
         ui.status(_(b'phases: %s\n') % b', '.join(t))
 
     if obsolete.isenabled(repo, obsolete.createmarkersopt):
         for trouble in (b"orphan", b"contentdivergent", b"phasedivergent"):
             numtrouble = len(repo.revs(trouble + b"()"))
             # We write all the possibilities to ease translation
             troublemsg = {
                 b"orphan": _(b"orphan: %d changesets"),
                 b"contentdivergent": _(b"content-divergent: %d changesets"),
                 b"phasedivergent": _(b"phase-divergent: %d changesets"),
             }
             if numtrouble > 0:
                 ui.status(troublemsg[trouble] % numtrouble + b"\n")
 
     cmdutil.summaryhooks(ui, repo)
 
     if opts.get(b'remote'):
         needsincoming, needsoutgoing = True, True
     else:
         needsincoming, needsoutgoing = False, False
         for i, o in cmdutil.summaryremotehooks(ui, repo, opts, None):
             if i:
                 needsincoming = True
             if o:
                 needsoutgoing = True
         if not needsincoming and not needsoutgoing:
             return
 
     def getincoming():
         source, branches = hg.parseurl(ui.expandpath(b'default'))
         sbranch = branches[0]
         try:
             other = hg.peer(repo, {}, source)
         except error.RepoError:
             if opts.get(b'remote'):
                 raise
             return source, sbranch, None, None, None
         revs, checkout = hg.addbranchrevs(repo, other, branches, None)
         if revs:
             revs = [other.lookup(rev) for rev in revs]
         ui.debug(b'comparing with %s\n' % util.hidepassword(source))
         repo.ui.pushbuffer()
         commoninc = discovery.findcommonincoming(repo, other, heads=revs)
         repo.ui.popbuffer()
         return source, sbranch, other, commoninc, commoninc[1]
 
     if needsincoming:
         source, sbranch, sother, commoninc, incoming = getincoming()
     else:
         source = sbranch = sother = commoninc = incoming = None
 
     def getoutgoing():
         dest, branches = hg.parseurl(ui.expandpath(b'default-push', b'default'))
         dbranch = branches[0]
         revs, checkout = hg.addbranchrevs(repo, repo, branches, None)
         if source != dest:
             try:
                 dother = hg.peer(repo, {}, dest)
             except error.RepoError:
                 if opts.get(b'remote'):
                     raise
                 return dest, dbranch, None, None
             ui.debug(b'comparing with %s\n' % util.hidepassword(dest))
         elif sother is None:
             # there is no explicit destination peer, but source one is invalid
             return dest, dbranch, None, None
         else:
             dother = sother
         if source != dest or (sbranch is not None and sbranch != dbranch):
             common = None
         else:
             common = commoninc
         if revs:
             revs = [repo.lookup(rev) for rev in revs]
         repo.ui.pushbuffer()
         outgoing = discovery.findcommonoutgoing(
             repo, dother, onlyheads=revs, commoninc=common
         )
         repo.ui.popbuffer()
         return dest, dbranch, dother, outgoing
 
     if needsoutgoing:
         dest, dbranch, dother, outgoing = getoutgoing()
     else:
         dest = dbranch = dother = outgoing = None
 
     if opts.get(b'remote'):
         t = []
         if incoming:
             t.append(_(b'1 or more incoming'))
         o = outgoing.missing
         if o:
             t.append(_(b'%d outgoing') % len(o))
         other = dother or sother
         if b'bookmarks' in other.listkeys(b'namespaces'):
             counts = bookmarks.summary(repo, other)
             if counts[0] > 0:
                 t.append(_(b'%d incoming bookmarks') % counts[0])
             if counts[1] > 0:
                 t.append(_(b'%d outgoing bookmarks') % counts[1])
 
         if t:
             # i18n: column positioning for "hg summary"
             ui.write(_(b'remote: %s\n') % (b', '.join(t)))
         else:
             # i18n: column positioning for "hg summary"
             ui.status(_(b'remote: (synced)\n'))
 
     cmdutil.summaryremotehooks(
         ui,
         repo,
         opts,
         (
             (source, sbranch, sother, commoninc),
             (dest, dbranch, dother, outgoing),
         ),
     )
 
 
 @command(
     b'tag',
     [
         (b'f', b'force', None, _(b'force tag')),
         (b'l', b'local', None, _(b'make the tag local')),
         (b'r', b'rev', b'', _(b'revision to tag'), _(b'REV')),
         (b'', b'remove', None, _(b'remove a tag')),
         # -l/--local is already there, commitopts cannot be used
         (b'e', b'edit', None, _(b'invoke editor on commit messages')),
         (b'm', b'message', b'', _(b'use text as commit message'), _(b'TEXT')),
     ]
     + commitopts2,
     _(b'[-f] [-l] [-m TEXT] [-d DATE] [-u USER] [-r REV] NAME...'),
     helpcategory=command.CATEGORY_CHANGE_ORGANIZATION,
 )
 def tag(ui, repo, name1, *names, **opts):
     """add one or more tags for the current or given revision
 
     Name a particular revision using <name>.
 
     Tags are used to name particular revisions of the repository and are
     very useful to compare different revisions, to go back to significant
     earlier versions or to mark branch points as releases, etc. Changing
     an existing tag is normally disallowed; use -f/--force to override.
 
     If no revision is given, the parent of the working directory is
     used.
 
     To facilitate version control, distribution, and merging of tags,
     they are stored as a file named ".hgtags" which is managed similarly
     to other project files and can be hand-edited if necessary. This
     also means that tagging creates a new commit. The file
     ".hg/localtags" is used for local tags (not shared among
     repositories).
 
     Tag commits are usually made at the head of a branch. If the parent
     of the working directory is not a branch head, :hg:`tag` aborts; use
     -f/--force to force the tag commit to be based on a non-head
     changeset.
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     Since tag names have priority over branch names during revision
     lookup, using an existing branch name as a tag name is discouraged.
 
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
     with repo.wlock(), repo.lock():
         rev_ = b"."
         names = [t.strip() for t in (name1,) + names]
         if len(names) != len(set(names)):
             raise error.Abort(_(b'tag names must be unique'))
         for n in names:
             scmutil.checknewlabel(repo, n, b'tag')
             if not n:
                 raise error.Abort(
                     _(b'tag names cannot consist entirely of whitespace')
                 )
         if opts.get(b'rev') and opts.get(b'remove'):
             raise error.Abort(_(b"--rev and --remove are incompatible"))
         if opts.get(b'rev'):
             rev_ = opts[b'rev']
         message = opts.get(b'message')
         if opts.get(b'remove'):
             if opts.get(b'local'):
                 expectedtype = b'local'
             else:
                 expectedtype = b'global'
 
             for n in names:
                 if repo.tagtype(n) == b'global':
                     alltags = tagsmod.findglobaltags(ui, repo)
                     if alltags[n][0] == nullid:
                         raise error.Abort(_(b"tag '%s' is already removed") % n)
                 if not repo.tagtype(n):
                     raise error.Abort(_(b"tag '%s' does not exist") % n)
                 if repo.tagtype(n) != expectedtype:
                     if expectedtype == b'global':
                         raise error.Abort(
                             _(b"tag '%s' is not a global tag") % n
                         )
                     else:
                         raise error.Abort(_(b"tag '%s' is not a local tag") % n)
             rev_ = b'null'
             if not message:
                 # we don't translate commit messages
                 message = b'Removed tag %s' % b', '.join(names)
         elif not opts.get(b'force'):
             for n in names:
                 if n in repo.tags():
                     raise error.Abort(
                         _(b"tag '%s' already exists (use -f to force)") % n
                     )
         if not opts.get(b'local'):
             p1, p2 = repo.dirstate.parents()
             if p2 != nullid:
                 raise error.Abort(_(b'uncommitted merge'))
             bheads = repo.branchheads()
             if not opts.get(b'force') and bheads and p1 not in bheads:
                 raise error.Abort(
                     _(
                         b'working directory is not at a branch head '
                         b'(use -f to force)'
                     )
                 )
         node = scmutil.revsingle(repo, rev_).node()
 
         if not message:
             # we don't translate commit messages
             message = b'Added tag %s for changeset %s' % (
                 b', '.join(names),
                 short(node),
             )
 
         date = opts.get(b'date')
         if date:
             date = dateutil.parsedate(date)
 
         if opts.get(b'remove'):
             editform = b'tag.remove'
         else:
             editform = b'tag.add'
         editor = cmdutil.getcommiteditor(
             editform=editform, **pycompat.strkwargs(opts)
         )
 
         # don't allow tagging the null rev
         if (
             not opts.get(b'remove')
             and scmutil.revsingle(repo, rev_).rev() == nullrev
         ):
             raise error.Abort(_(b"cannot tag null revision"))
 
         tagsmod.tag(
             repo,
             names,
             node,
             message,
             opts.get(b'local'),
             opts.get(b'user'),
             date,
             editor=editor,
         )
 
 
 @command(
     b'tags',
     formatteropts,
     b'',
     helpcategory=command.CATEGORY_CHANGE_ORGANIZATION,
     intents={INTENT_READONLY},
 )
 def tags(ui, repo, **opts):
     """list repository tags
 
     This lists both regular and local tags. When the -v/--verbose
     switch is used, a third column "local" is printed for local tags.
     When the -q/--quiet switch is used, only the tag name is printed.
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported in addition to the common template
       keywords and functions such as ``{tag}``. See also
       :hg:`help templates`.
 
       :type:    String. ``local`` for local tags.
 
     Returns 0 on success.
     """
 
     opts = pycompat.byteskwargs(opts)
     ui.pager(b'tags')
     fm = ui.formatter(b'tags', opts)
     hexfunc = fm.hexfunc
 
     for t, n in reversed(repo.tagslist()):
         hn = hexfunc(n)
         label = b'tags.normal'
         tagtype = b''
         if repo.tagtype(t) == b'local':
             label = b'tags.local'
             tagtype = b'local'
 
         fm.startitem()
         fm.context(repo=repo)
         fm.write(b'tag', b'%s', t, label=label)
         fmt = b" " * (30 - encoding.colwidth(t)) + b' %5d:%s'
         fm.condwrite(
             not ui.quiet,
             b'rev node',
             fmt,
             repo.changelog.rev(n),
             hn,
             label=label,
         )
         fm.condwrite(
             ui.verbose and tagtype, b'type', b' %s', tagtype, label=label
         )
         fm.plain(b'\n')
     fm.end()
 
 
 @command(
     b'tip',
     [
         (b'p', b'patch', None, _(b'show patch')),
         (b'g', b'git', None, _(b'use git extended diff format')),
     ]
     + templateopts,
     _(b'[-p] [-g]'),
     helpcategory=command.CATEGORY_CHANGE_NAVIGATION,
 )
 def tip(ui, repo, **opts):
     """show the tip revision (DEPRECATED)
 
     The tip revision (usually just called the tip) is the changeset
     most recently added to the repository (and therefore the most
     recently changed head).
 
     If you have just made a commit, that commit will be the tip. If
     you have just pulled changes from another repository, the tip of
     that repository becomes the current tip. The "tip" tag is special
     and cannot be renamed or assigned to a different changeset.
 
     This command is deprecated, please use :hg:`heads` instead.
 
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
     displayer = logcmdutil.changesetdisplayer(ui, repo, opts)
     displayer.show(repo[b'tip'])
     displayer.close()
 
 
 @command(
     b'unbundle',
     [
         (
             b'u',
             b'update',
             None,
             _(b'update to new branch head if changesets were unbundled'),
         )
     ],
     _(b'[-u] FILE...'),
     helpcategory=command.CATEGORY_IMPORT_EXPORT,
 )
 def unbundle(ui, repo, fname1, *fnames, **opts):
     """apply one or more bundle files
 
     Apply one or more bundle files generated by :hg:`bundle`.
 
     Returns 0 on success, 1 if an update has unresolved files.
     """
     fnames = (fname1,) + fnames
 
     with repo.lock():
         for fname in fnames:
             f = hg.openpath(ui, fname)
             gen = exchange.readbundle(ui, f, fname)
             if isinstance(gen, streamclone.streamcloneapplier):
                 raise error.Abort(
                     _(
                         b'packed bundles cannot be applied with '
                         b'"hg unbundle"'
                     ),
                     hint=_(b'use "hg debugapplystreamclonebundle"'),
                 )
             url = b'bundle:' + fname
             try:
                 txnname = b'unbundle'
                 if not isinstance(gen, bundle2.unbundle20):
                     txnname = b'unbundle\n%s' % util.hidepassword(url)
                 with repo.transaction(txnname) as tr:
                     op = bundle2.applybundle(
                         repo, gen, tr, source=b'unbundle', url=url
                     )
             except error.BundleUnknownFeatureError as exc:
                 raise error.Abort(
                     _(b'%s: unknown bundle feature, %s') % (fname, exc),
                     hint=_(
                         b"see https://mercurial-scm.org/"
                         b"wiki/BundleFeature for more "
                         b"information"
                     ),
                 )
             modheads = bundle2.combinechangegroupresults(op)
 
     return postincoming(ui, repo, modheads, opts.get('update'), None, None)
 
 
 @command(
     b'unshelve',
     [
         (b'a', b'abort', None, _(b'abort an incomplete unshelve operation')),
         (
             b'c',
             b'continue',
             None,
             _(b'continue an incomplete unshelve operation'),
         ),
         (b'i', b'interactive', None, _(b'use interactive mode (EXPERIMENTAL)')),
         (b'k', b'keep', None, _(b'keep shelve after unshelving')),
         (
             b'n',
             b'name',
             b'',
             _(b'restore shelved change with given name'),
             _(b'NAME'),
         ),
         (b't', b'tool', b'', _(b'specify merge tool')),
         (
             b'',
             b'date',
             b'',
             _(b'set date for temporary commits (DEPRECATED)'),
             _(b'DATE'),
         ),
     ],
     _(b'hg unshelve [OPTION]... [[-n] SHELVED]'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
 )
 def unshelve(ui, repo, *shelved, **opts):
     """restore a shelved change to the working directory
 
     This command accepts an optional name of a shelved change to
     restore. If none is given, the most recent shelved change is used.
 
     If a shelved change is applied successfully, the bundle that
     contains the shelved changes is moved to a backup location
     (.hg/shelve-backup).
 
     Since you can restore a shelved change on top of an arbitrary
     commit, it is possible that unshelving will result in a conflict
     between your changes and the commits you are unshelving onto. If
     this occurs, you must resolve the conflict, then use
     ``--continue`` to complete the unshelve operation. (The bundle
     will not be moved until you successfully complete the unshelve.)
 
     (Alternatively, you can use ``--abort`` to abandon an unshelve
     that causes a conflict. This reverts the unshelved changes, and
     leaves the bundle in place.)
 
     If bare shelved change (without interactive, include and exclude
     option) was done on newly created branch it would restore branch
     information to the working directory.
 
     After a successful unshelve, the shelved changes are stored in a
     backup directory. Only the N most recent backups are kept. N
     defaults to 10 but can be overridden using the ``shelve.maxbackups``
     configuration option.
 
     .. container:: verbose
 
        Timestamp in seconds is used to decide order of backups. More
        than ``maxbackups`` backups are kept, if same timestamp
        prevents from deciding exact order of them, for safety.
 
        Selected changes can be unshelved with ``--interactive`` flag.
        The working directory is updated with the selected changes, and
        only the unselected changes remain shelved.
        Note: The whole shelve is applied to working directory first before
        running interactively. So, this will bring up all the conflicts between
        working directory and the shelve, irrespective of which changes will be
        unshelved.
     """
     with repo.wlock():
         return shelvemod.unshelvecmd(ui, repo, *shelved, **opts)
 
 
 statemod.addunfinished(
     b'unshelve',
     fname=b'shelvedstate',
     continueflag=True,
     abortfunc=shelvemod.hgabortunshelve,
     continuefunc=shelvemod.hgcontinueunshelve,
     cmdmsg=_(b'unshelve already in progress'),
 )
 
 
 @command(
     b'update|up|checkout|co',
     [
         (b'C', b'clean', None, _(b'discard uncommitted changes (no backup)')),
         (b'c', b'check', None, _(b'require clean working directory')),
         (b'm', b'merge', None, _(b'merge uncommitted changes')),
         (b'd', b'date', b'', _(b'tipmost revision matching date'), _(b'DATE')),
         (b'r', b'rev', b'', _(b'revision'), _(b'REV')),
     ]
     + mergetoolopts,
     _(b'[-C|-c|-m] [-d DATE] [[-r] REV]'),
     helpcategory=command.CATEGORY_WORKING_DIRECTORY,
     helpbasic=True,
 )
 def update(ui, repo, node=None, **opts):
     """update working directory (or switch revisions)
 
     Update the repository's working directory to the specified
     changeset. If no changeset is specified, update to the tip of the
     current named branch and move the active bookmark (see :hg:`help
     bookmarks`).
 
     Update sets the working directory's parent revision to the specified
     changeset (see :hg:`help parents`).
 
     If the changeset is not a descendant or ancestor of the working
     directory's parent and there are uncommitted changes, the update is
     aborted. With the -c/--check option, the working directory is checked
     for uncommitted changes; if none are found, the working directory is
     updated to the specified changeset.
 
     .. container:: verbose
 
       The -C/--clean, -c/--check, and -m/--merge options control what
       happens if the working directory contains uncommitted changes.
       At most of one of them can be specified.
 
       1. If no option is specified, and if
          the requested changeset is an ancestor or descendant of
          the working directory's parent, the uncommitted changes
          are merged into the requested changeset and the merged
          result is left uncommitted. If the requested changeset is
          not an ancestor or descendant (that is, it is on another
          branch), the update is aborted and the uncommitted changes
          are preserved.
 
       2. With the -m/--merge option, the update is allowed even if the
          requested changeset is not an ancestor or descendant of
          the working directory's parent.
 
       3. With the -c/--check option, the update is aborted and the
          uncommitted changes are preserved.
 
       4. With the -C/--clean option, uncommitted changes are discarded and
          the working directory is updated to the requested changeset.
 
     To cancel an uncommitted merge (and lose your changes), use
     :hg:`merge --abort`.
 
     Use null as the changeset to remove the working directory (like
     :hg:`clone -U`).
 
     If you want to revert just one file to an older revision, use
     :hg:`revert [-r REV] NAME`.
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     Returns 0 on success, 1 if there are unresolved files.
     """
     cmdutil.check_at_most_one_arg(opts, 'clean', 'check', 'merge')
     rev = opts.get('rev')
     date = opts.get('date')
     clean = opts.get('clean')
     check = opts.get('check')
     merge = opts.get('merge')
     if rev and node:
         raise error.Abort(_(b"please specify just one revision"))
 
     if ui.configbool(b'commands', b'update.requiredest'):
         if not node and not rev and not date:
             raise error.Abort(
                 _(b'you must specify a destination'),
                 hint=_(b'for example: hg update ".::"'),
             )
 
     if rev is None or rev == b'':
         rev = node
 
     if date and rev is not None:
         raise error.Abort(_(b"you can't specify a revision and a date"))
 
     updatecheck = None
     if check:
         updatecheck = b'abort'
     elif merge:
         updatecheck = b'none'
 
     with repo.wlock():
         cmdutil.clearunfinished(repo)
         if date:
             rev = cmdutil.finddate(ui, repo, date)
 
         # if we defined a bookmark, we have to remember the original name
         brev = rev
         if rev:
             repo = scmutil.unhidehashlikerevs(repo, [rev], b'nowarn')
         ctx = scmutil.revsingle(repo, rev, default=None)
         rev = ctx.rev()
         hidden = ctx.hidden()
         overrides = {(b'ui', b'forcemerge'): opts.get('tool', b'')}
         with ui.configoverride(overrides, b'update'):
             ret = hg.updatetotally(
                 ui, repo, rev, brev, clean=clean, updatecheck=updatecheck
             )
         if hidden:
             ctxstr = ctx.hex()[:12]
             ui.warn(_(b"updated to hidden changeset %s\n") % ctxstr)
 
             if ctx.obsolete():
                 obsfatemsg = obsutil._getfilteredreason(repo, ctxstr, ctx)
                 ui.warn(b"(%s)\n" % obsfatemsg)
         return ret
 
 
 @command(
     b'verify',
     [(b'', b'full', False, b'perform more checks (EXPERIMENTAL)')],
     helpcategory=command.CATEGORY_MAINTENANCE,
 )
 def verify(ui, repo, **opts):
     """verify the integrity of the repository
 
     Verify the integrity of the current repository.
 
     This will perform an extensive check of the repository's
     integrity, validating the hashes and checksums of each entry in
     the changelog, manifest, and tracked files, as well as the
     integrity of their crosslinks and indices.
 
     Please see https://mercurial-scm.org/wiki/RepositoryCorruption
     for more information about recovery from corruption of the
     repository.
 
     Returns 0 on success, 1 if errors are encountered.
     """
     opts = pycompat.byteskwargs(opts)
 
     level = None
     if opts[b'full']:
         level = verifymod.VERIFY_FULL
     return hg.verify(repo, level)
 
 
 @command(
     b'version',
     [] + formatteropts,
     helpcategory=command.CATEGORY_HELP,
     norepo=True,
     intents={INTENT_READONLY},
 )
 def version_(ui, **opts):
     """output version and copyright information
 
     .. container:: verbose
 
       Template:
 
       The following keywords are supported. See also :hg:`help templates`.
 
       :extensions: List of extensions.
       :ver:     String. Version number.
 
       And each entry of ``{extensions}`` provides the following sub-keywords
       in addition to ``{ver}``.
 
       :bundled: Boolean. True if included in the release.
       :name:    String. Extension name.
     """
     opts = pycompat.byteskwargs(opts)
     if ui.verbose:
         ui.pager(b'version')
     fm = ui.formatter(b"version", opts)
     fm.startitem()
     fm.write(
         b"ver", _(b"Mercurial Distributed SCM (version %s)\n"), util.version()
     )
     license = _(
         b"(see https://mercurial-scm.org for more information)\n"
         b"\nCopyright (C) 2005-2020 Matt Mackall and others\n"
         b"This is free software; see the source for copying conditions. "
         b"There is NO\nwarranty; "
         b"not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
     )
     if not ui.quiet:
         fm.plain(license)
 
     if ui.verbose:
         fm.plain(_(b"\nEnabled extensions:\n\n"))
     # format names and versions into columns
     names = []
     vers = []
     isinternals = []
     for name, module in extensions.extensions():
         names.append(name)
         vers.append(extensions.moduleversion(module) or None)
         isinternals.append(extensions.ismoduleinternal(module))
     fn = fm.nested(b"extensions", tmpl=b'{name}\n')
     if names:
         namefmt = b"  %%-%ds  " % max(len(n) for n in names)
         places = [_(b"external"), _(b"internal")]
         for n, v, p in zip(names, vers, isinternals):
             fn.startitem()
             fn.condwrite(ui.verbose, b"name", namefmt, n)
             if ui.verbose:
                 fn.plain(b"%s  " % places[p])
             fn.data(bundled=p)
             fn.condwrite(ui.verbose and v, b"ver", b"%s", v)
             if ui.verbose:
                 fn.plain(b"\n")
     fn.end()
     fm.end()
 
 
 def loadcmdtable(ui, name, cmdtable):
     """Load command functions from specified cmdtable
     """
     overrides = [cmd for cmd in cmdtable if cmd in table]
     if overrides:
         ui.warn(
             _(b"extension '%s' overrides commands: %s\n")
             % (name, b" ".join(overrides))
         )
     table.update(cmdtable)

mercurial/localrepo.py

@@ -1,3804 +1,3812 b''
 # localrepo.py - read/write repository class for mercurial
 #
 # Copyright 2005-2007 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 from __future__ import absolute_import
 
 import errno
 import os
 import random
 import sys
 import time
 import weakref
 
 from .i18n import _
 from .node import (
     bin,
     hex,
     nullid,
     nullrev,
     short,
 )
 from .pycompat import (
     delattr,
     getattr,
 )
 from . import (
     bookmarks,
     branchmap,
     bundle2,
     changegroup,
     color,
     context,
     dirstate,
     dirstateguard,
     discovery,
     encoding,
     error,
     exchange,
     extensions,
     filelog,
     hook,
     lock as lockmod,
     match as matchmod,
     merge as mergemod,
     mergeutil,
     namespaces,
     narrowspec,
     obsolete,
     pathutil,
     phases,
     pushkey,
     pycompat,
     rcutil,
     repoview,
     revset,
     revsetlang,
     scmutil,
     sparse,
     store as storemod,
     subrepoutil,
     tags as tagsmod,
     transaction,
     txnutil,
     util,
     vfs as vfsmod,
 )
 
 from .interfaces import (
     repository,
     util as interfaceutil,
 )
 
 from .utils import (
     hashutil,
     procutil,
     stringutil,
 )
 
 from .revlogutils import constants as revlogconst
 
 release = lockmod.release
 urlerr = util.urlerr
 urlreq = util.urlreq
 
 # set of (path, vfs-location) tuples. vfs-location is:
 # - 'plain for vfs relative paths
 # - '' for svfs relative paths
 _cachedfiles = set()
 
 
 class _basefilecache(scmutil.filecache):
     """All filecache usage on repo are done for logic that should be unfiltered
     """
 
     def __get__(self, repo, type=None):
         if repo is None:
             return self
         # proxy to unfiltered __dict__ since filtered repo has no entry
         unfi = repo.unfiltered()
         try:
             return unfi.__dict__[self.sname]
         except KeyError:
             pass
         return super(_basefilecache, self).__get__(unfi, type)
 
     def set(self, repo, value):
         return super(_basefilecache, self).set(repo.unfiltered(), value)
 
 
 class repofilecache(_basefilecache):
     """filecache for files in .hg but outside of .hg/store"""
 
     def __init__(self, *paths):
         super(repofilecache, self).__init__(*paths)
         for path in paths:
             _cachedfiles.add((path, b'plain'))
 
     def join(self, obj, fname):
         return obj.vfs.join(fname)
 
 
 class storecache(_basefilecache):
     """filecache for files in the store"""
 
     def __init__(self, *paths):
         super(storecache, self).__init__(*paths)
         for path in paths:
             _cachedfiles.add((path, b''))
 
     def join(self, obj, fname):
         return obj.sjoin(fname)
 
 
 class mixedrepostorecache(_basefilecache):
     """filecache for a mix files in .hg/store and outside"""
 
     def __init__(self, *pathsandlocations):
         # scmutil.filecache only uses the path for passing back into our
         # join(), so we can safely pass a list of paths and locations
         super(mixedrepostorecache, self).__init__(*pathsandlocations)
         _cachedfiles.update(pathsandlocations)
 
     def join(self, obj, fnameandlocation):
         fname, location = fnameandlocation
         if location == b'plain':
             return obj.vfs.join(fname)
         else:
             if location != b'':
                 raise error.ProgrammingError(
                     b'unexpected location: %s' % location
                 )
             return obj.sjoin(fname)
 
 
 def isfilecached(repo, name):
     """check if a repo has already cached "name" filecache-ed property
 
     This returns (cachedobj-or-None, iscached) tuple.
     """
     cacheentry = repo.unfiltered()._filecache.get(name, None)
     if not cacheentry:
         return None, False
     return cacheentry.obj, True
 
 
 class unfilteredpropertycache(util.propertycache):
     """propertycache that apply to unfiltered repo only"""
 
     def __get__(self, repo, type=None):
         unfi = repo.unfiltered()
         if unfi is repo:
             return super(unfilteredpropertycache, self).__get__(unfi)
         return getattr(unfi, self.name)
 
 
 class filteredpropertycache(util.propertycache):
     """propertycache that must take filtering in account"""
 
     def cachevalue(self, obj, value):
         object.__setattr__(obj, self.name, value)
 
 
 def hasunfilteredcache(repo, name):
     """check if a repo has an unfilteredpropertycache value for <name>"""
     return name in vars(repo.unfiltered())
 
 
 def unfilteredmethod(orig):
     """decorate method that always need to be run on unfiltered version"""
 
     def wrapper(repo, *args, **kwargs):
         return orig(repo.unfiltered(), *args, **kwargs)
 
     return wrapper
 
 
 moderncaps = {
     b'lookup',
     b'branchmap',
     b'pushkey',
     b'known',
     b'getbundle',
     b'unbundle',
 }
 legacycaps = moderncaps.union({b'changegroupsubset'})
 
 
 @interfaceutil.implementer(repository.ipeercommandexecutor)
 class localcommandexecutor(object):
     def __init__(self, peer):
         self._peer = peer
         self._sent = False
         self._closed = False
 
     def __enter__(self):
         return self
 
     def __exit__(self, exctype, excvalue, exctb):
         self.close()
 
     def callcommand(self, command, args):
         if self._sent:
             raise error.ProgrammingError(
                 b'callcommand() cannot be used after sendcommands()'
             )
 
         if self._closed:
             raise error.ProgrammingError(
                 b'callcommand() cannot be used after close()'
             )
 
         # We don't need to support anything fancy. Just call the named
         # method on the peer and return a resolved future.
         fn = getattr(self._peer, pycompat.sysstr(command))
 
         f = pycompat.futures.Future()
 
         try:
             result = fn(**pycompat.strkwargs(args))
         except Exception:
             pycompat.future_set_exception_info(f, sys.exc_info()[1:])
         else:
             f.set_result(result)
 
         return f
 
     def sendcommands(self):
         self._sent = True
 
     def close(self):
         self._closed = True
 
 
 @interfaceutil.implementer(repository.ipeercommands)
 class localpeer(repository.peer):
     '''peer for a local repo; reflects only the most recent API'''
 
     def __init__(self, repo, caps=None):
         super(localpeer, self).__init__()
 
         if caps is None:
             caps = moderncaps.copy()
         self._repo = repo.filtered(b'served')
         self.ui = repo.ui
         self._caps = repo._restrictcapabilities(caps)
 
     # Begin of _basepeer interface.
 
     def url(self):
         return self._repo.url()
 
     def local(self):
         return self._repo
 
     def peer(self):
         return self
 
     def canpush(self):
         return True
 
     def close(self):
         self._repo.close()
 
     # End of _basepeer interface.
 
     # Begin of _basewirecommands interface.
 
     def branchmap(self):
         return self._repo.branchmap()
 
     def capabilities(self):
         return self._caps
 
     def clonebundles(self):
         return self._repo.tryread(b'clonebundles.manifest')
 
     def debugwireargs(self, one, two, three=None, four=None, five=None):
         """Used to test argument passing over the wire"""
         return b"%s %s %s %s %s" % (
             one,
             two,
             pycompat.bytestr(three),
             pycompat.bytestr(four),
             pycompat.bytestr(five),
         )
 
     def getbundle(
         self, source, heads=None, common=None, bundlecaps=None, **kwargs
     ):
         chunks = exchange.getbundlechunks(
             self._repo,
             source,
             heads=heads,
             common=common,
             bundlecaps=bundlecaps,
             **kwargs
         )[1]
         cb = util.chunkbuffer(chunks)
 
         if exchange.bundle2requested(bundlecaps):
             # When requesting a bundle2, getbundle returns a stream to make the
             # wire level function happier. We need to build a proper object
             # from it in local peer.
             return bundle2.getunbundler(self.ui, cb)
         else:
             return changegroup.getunbundler(b'01', cb, None)
 
     def heads(self):
         return self._repo.heads()
 
     def known(self, nodes):
         return self._repo.known(nodes)
 
     def listkeys(self, namespace):
         return self._repo.listkeys(namespace)
 
     def lookup(self, key):
         return self._repo.lookup(key)
 
     def pushkey(self, namespace, key, old, new):
         return self._repo.pushkey(namespace, key, old, new)
 
     def stream_out(self):
         raise error.Abort(_(b'cannot perform stream clone against local peer'))
 
     def unbundle(self, bundle, heads, url):
         """apply a bundle on a repo
 
         This function handles the repo locking itself."""
         try:
             try:
                 bundle = exchange.readbundle(self.ui, bundle, None)
                 ret = exchange.unbundle(self._repo, bundle, heads, b'push', url)
                 if util.safehasattr(ret, b'getchunks'):
                     # This is a bundle20 object, turn it into an unbundler.
                     # This little dance should be dropped eventually when the
                     # API is finally improved.
                     stream = util.chunkbuffer(ret.getchunks())
                     ret = bundle2.getunbundler(self.ui, stream)
                 return ret
             except Exception as exc:
                 # If the exception contains output salvaged from a bundle2
                 # reply, we need to make sure it is printed before continuing
                 # to fail. So we build a bundle2 with such output and consume
                 # it directly.
                 #
                 # This is not very elegant but allows a "simple" solution for
                 # issue4594
                 output = getattr(exc, '_bundle2salvagedoutput', ())
                 if output:
                     bundler = bundle2.bundle20(self._repo.ui)
                     for out in output:
                         bundler.addpart(out)
                     stream = util.chunkbuffer(bundler.getchunks())
                     b = bundle2.getunbundler(self.ui, stream)
                     bundle2.processbundle(self._repo, b)
                 raise
         except error.PushRaced as exc:
             raise error.ResponseError(
                 _(b'push failed:'), stringutil.forcebytestr(exc)
             )
 
     # End of _basewirecommands interface.
 
     # Begin of peer interface.
 
     def commandexecutor(self):
         return localcommandexecutor(self)
 
     # End of peer interface.
 
 
 @interfaceutil.implementer(repository.ipeerlegacycommands)
 class locallegacypeer(localpeer):
     '''peer extension which implements legacy methods too; used for tests with
     restricted capabilities'''
 
     def __init__(self, repo):
         super(locallegacypeer, self).__init__(repo, caps=legacycaps)
 
     # Begin of baselegacywirecommands interface.
 
     def between(self, pairs):
         return self._repo.between(pairs)
 
     def branches(self, nodes):
         return self._repo.branches(nodes)
 
     def changegroup(self, nodes, source):
         outgoing = discovery.outgoing(
             self._repo, missingroots=nodes, missingheads=self._repo.heads()
         )
         return changegroup.makechangegroup(self._repo, outgoing, b'01', source)
 
     def changegroupsubset(self, bases, heads, source):
         outgoing = discovery.outgoing(
             self._repo, missingroots=bases, missingheads=heads
         )
         return changegroup.makechangegroup(self._repo, outgoing, b'01', source)
 
     # End of baselegacywirecommands interface.
 
 
 # Increment the sub-version when the revlog v2 format changes to lock out old
 # clients.
 REVLOGV2_REQUIREMENT = b'exp-revlogv2.1'
 
 # A repository with the sparserevlog feature will have delta chains that
 # can spread over a larger span. Sparse reading cuts these large spans into
 # pieces, so that each piece isn't too big.
 # Without the sparserevlog capability, reading from the repository could use
 # huge amounts of memory, because the whole span would be read at once,
 # including all the intermediate revisions that aren't pertinent for the chain.
 # This is why once a repository has enabled sparse-read, it becomes required.
 SPARSEREVLOG_REQUIREMENT = b'sparserevlog'
 
 # A repository with the sidedataflag requirement will allow to store extra
 # information for revision without altering their original hashes.
 SIDEDATA_REQUIREMENT = b'exp-sidedata-flag'
 
 # A repository with the the copies-sidedata-changeset requirement will store
 # copies related information in changeset's sidedata.
 COPIESSDC_REQUIREMENT = b'exp-copies-sidedata-changeset'
 
 # Functions receiving (ui, features) that extensions can register to impact
 # the ability to load repositories with custom requirements. Only
 # functions defined in loaded extensions are called.
 #
 # The function receives a set of requirement strings that the repository
 # is capable of opening. Functions will typically add elements to the
 # set to reflect that the extension knows how to handle that requirements.
 featuresetupfuncs = set()
 
 
 def makelocalrepository(baseui, path, intents=None):
     """Create a local repository object.
 
     Given arguments needed to construct a local repository, this function
     performs various early repository loading functionality (such as
     reading the ``.hg/requires`` and ``.hg/hgrc`` files), validates that
     the repository can be opened, derives a type suitable for representing
     that repository, and returns an instance of it.
 
     The returned object conforms to the ``repository.completelocalrepository``
     interface.
 
     The repository type is derived by calling a series of factory functions
     for each aspect/interface of the final repository. These are defined by
     ``REPO_INTERFACES``.
 
     Each factory function is called to produce a type implementing a specific
     interface. The cumulative list of returned types will be combined into a
     new type and that type will be instantiated to represent the local
     repository.
 
     The factory functions each receive various state that may be consulted
     as part of deriving a type.
 
     Extensions should wrap these factory functions to customize repository type
     creation. Note that an extension's wrapped function may be called even if
     that extension is not loaded for the repo being constructed. Extensions
     should check if their ``__name__`` appears in the
     ``extensionmodulenames`` set passed to the factory function and no-op if
     not.
     """
     ui = baseui.copy()
     # Prevent copying repo configuration.
     ui.copy = baseui.copy
 
     # Working directory VFS rooted at repository root.
     wdirvfs = vfsmod.vfs(path, expandpath=True, realpath=True)
 
     # Main VFS for .hg/ directory.
     hgpath = wdirvfs.join(b'.hg')
     hgvfs = vfsmod.vfs(hgpath, cacheaudited=True)
 
     # The .hg/ path should exist and should be a directory. All other
     # cases are errors.
     if not hgvfs.isdir():
         try:
             hgvfs.stat()
         except OSError as e:
             if e.errno != errno.ENOENT:
                 raise
 
         raise error.RepoError(_(b'repository %s not found') % path)
 
     # .hg/requires file contains a newline-delimited list of
     # features/capabilities the opener (us) must have in order to use
     # the repository. This file was introduced in Mercurial 0.9.2,
     # which means very old repositories may not have one. We assume
     # a missing file translates to no requirements.
     try:
         requirements = set(hgvfs.read(b'requires').splitlines())
     except IOError as e:
         if e.errno != errno.ENOENT:
             raise
         requirements = set()
 
     # The .hg/hgrc file may load extensions or contain config options
     # that influence repository construction. Attempt to load it and
     # process any new extensions that it may have pulled in.
     if loadhgrc(ui, wdirvfs, hgvfs, requirements):
         afterhgrcload(ui, wdirvfs, hgvfs, requirements)
         extensions.loadall(ui)
         extensions.populateui(ui)
 
     # Set of module names of extensions loaded for this repository.
     extensionmodulenames = {m.__name__ for n, m in extensions.extensions(ui)}
 
     supportedrequirements = gathersupportedrequirements(ui)
 
     # We first validate the requirements are known.
     ensurerequirementsrecognized(requirements, supportedrequirements)
 
     # Then we validate that the known set is reasonable to use together.
     ensurerequirementscompatible(ui, requirements)
 
     # TODO there are unhandled edge cases related to opening repositories with
     # shared storage. If storage is shared, we should also test for requirements
     # compatibility in the pointed-to repo. This entails loading the .hg/hgrc in
     # that repo, as that repo may load extensions needed to open it. This is a
     # bit complicated because we don't want the other hgrc to overwrite settings
     # in this hgrc.
     #
     # This bug is somewhat mitigated by the fact that we copy the .hg/requires
     # file when sharing repos. But if a requirement is added after the share is
     # performed, thereby introducing a new requirement for the opener, we may
     # will not see that and could encounter a run-time error interacting with
     # that shared store since it has an unknown-to-us requirement.
 
     # At this point, we know we should be capable of opening the repository.
     # Now get on with doing that.
 
     features = set()
 
     # The "store" part of the repository holds versioned data. How it is
     # accessed is determined by various requirements. The ``shared`` or
     # ``relshared`` requirements indicate the store lives in the path contained
     # in the ``.hg/sharedpath`` file. This is an absolute path for
     # ``shared`` and relative to ``.hg/`` for ``relshared``.
     if b'shared' in requirements or b'relshared' in requirements:
         sharedpath = hgvfs.read(b'sharedpath').rstrip(b'\n')
         if b'relshared' in requirements:
             sharedpath = hgvfs.join(sharedpath)
 
         sharedvfs = vfsmod.vfs(sharedpath, realpath=True)
 
         if not sharedvfs.exists():
             raise error.RepoError(
                 _(b'.hg/sharedpath points to nonexistent directory %s')
                 % sharedvfs.base
             )
 
         features.add(repository.REPO_FEATURE_SHARED_STORAGE)
 
         storebasepath = sharedvfs.base
         cachepath = sharedvfs.join(b'cache')
     else:
         storebasepath = hgvfs.base
         cachepath = hgvfs.join(b'cache')
     wcachepath = hgvfs.join(b'wcache')
 
     # The store has changed over time and the exact layout is dictated by
     # requirements. The store interface abstracts differences across all
     # of them.
     store = makestore(
         requirements,
         storebasepath,
         lambda base: vfsmod.vfs(base, cacheaudited=True),
     )
     hgvfs.createmode = store.createmode
 
     storevfs = store.vfs
     storevfs.options = resolvestorevfsoptions(ui, requirements, features)
 
     # The cache vfs is used to manage cache files.
     cachevfs = vfsmod.vfs(cachepath, cacheaudited=True)
     cachevfs.createmode = store.createmode
     # The cache vfs is used to manage cache files related to the working copy
     wcachevfs = vfsmod.vfs(wcachepath, cacheaudited=True)
     wcachevfs.createmode = store.createmode
 
     # Now resolve the type for the repository object. We do this by repeatedly
     # calling a factory function to produces types for specific aspects of the
     # repo's operation. The aggregate returned types are used as base classes
     # for a dynamically-derived type, which will represent our new repository.
 
     bases = []
     extrastate = {}
 
     for iface, fn in REPO_INTERFACES:
         # We pass all potentially useful state to give extensions tons of
         # flexibility.
         typ = fn()(
             ui=ui,
             intents=intents,
             requirements=requirements,
             features=features,
             wdirvfs=wdirvfs,
             hgvfs=hgvfs,
             store=store,
             storevfs=storevfs,
             storeoptions=storevfs.options,
             cachevfs=cachevfs,
             wcachevfs=wcachevfs,
             extensionmodulenames=extensionmodulenames,
             extrastate=extrastate,
             baseclasses=bases,
         )
 
         if not isinstance(typ, type):
             raise error.ProgrammingError(
                 b'unable to construct type for %s' % iface
             )
 
         bases.append(typ)
 
     # type() allows you to use characters in type names that wouldn't be
     # recognized as Python symbols in source code. We abuse that to add
     # rich information about our constructed repo.
     name = pycompat.sysstr(
         b'derivedrepo:%s<%s>' % (wdirvfs.base, b','.join(sorted(requirements)))
     )
 
     cls = type(name, tuple(bases), {})
 
     return cls(
         baseui=baseui,
         ui=ui,
         origroot=path,
         wdirvfs=wdirvfs,
         hgvfs=hgvfs,
         requirements=requirements,
         supportedrequirements=supportedrequirements,
         sharedpath=storebasepath,
         store=store,
         cachevfs=cachevfs,
         wcachevfs=wcachevfs,
         features=features,
         intents=intents,
     )
 
 
 def loadhgrc(ui, wdirvfs, hgvfs, requirements):
     """Load hgrc files/content into a ui instance.
 
     This is called during repository opening to load any additional
     config files or settings relevant to the current repository.
 
     Returns a bool indicating whether any additional configs were loaded.
 
     Extensions should monkeypatch this function to modify how per-repo
     configs are loaded. For example, an extension may wish to pull in
     configs from alternate files or sources.
     """
     if not rcutil.use_repo_hgrc():
         return False
     try:
         ui.readconfig(hgvfs.join(b'hgrc'), root=wdirvfs.base)
         return True
     except IOError:
         return False
 
 
 def afterhgrcload(ui, wdirvfs, hgvfs, requirements):
     """Perform additional actions after .hg/hgrc is loaded.
 
     This function is called during repository loading immediately after
     the .hg/hgrc file is loaded and before per-repo extensions are loaded.
 
     The function can be used to validate configs, automatically add
     options (including extensions) based on requirements, etc.
     """
 
     # Map of requirements to list of extensions to load automatically when
     # requirement is present.
     autoextensions = {
         b'git': [b'git'],
         b'largefiles': [b'largefiles'],
         b'lfs': [b'lfs'],
     }
 
     for requirement, names in sorted(autoextensions.items()):
         if requirement not in requirements:
             continue
 
         for name in names:
             if not ui.hasconfig(b'extensions', name):
                 ui.setconfig(b'extensions', name, b'', source=b'autoload')
 
 
 def gathersupportedrequirements(ui):
     """Determine the complete set of recognized requirements."""
     # Start with all requirements supported by this file.
     supported = set(localrepository._basesupported)
 
     # Execute ``featuresetupfuncs`` entries if they belong to an extension
     # relevant to this ui instance.
     modules = {m.__name__ for n, m in extensions.extensions(ui)}
 
     for fn in featuresetupfuncs:
         if fn.__module__ in modules:
             fn(ui, supported)
 
     # Add derived requirements from registered compression engines.
     for name in util.compengines:
         engine = util.compengines[name]
         if engine.available() and engine.revlogheader():
             supported.add(b'exp-compression-%s' % name)
             if engine.name() == b'zstd':
                 supported.add(b'revlog-compression-zstd')
 
     return supported
 
 
 def ensurerequirementsrecognized(requirements, supported):
     """Validate that a set of local requirements is recognized.
 
     Receives a set of requirements. Raises an ``error.RepoError`` if there
     exists any requirement in that set that currently loaded code doesn't
     recognize.
 
     Returns a set of supported requirements.
     """
     missing = set()
 
     for requirement in requirements:
         if requirement in supported:
             continue
 
         if not requirement or not requirement[0:1].isalnum():
             raise error.RequirementError(_(b'.hg/requires file is corrupt'))
 
         missing.add(requirement)
 
     if missing:
         raise error.RequirementError(
             _(b'repository requires features unknown to this Mercurial: %s')
             % b' '.join(sorted(missing)),
             hint=_(
                 b'see https://mercurial-scm.org/wiki/MissingRequirement '
                 b'for more information'
             ),
         )
 
 
 def ensurerequirementscompatible(ui, requirements):
     """Validates that a set of recognized requirements is mutually compatible.
 
     Some requirements may not be compatible with others or require
     config options that aren't enabled. This function is called during
     repository opening to ensure that the set of requirements needed
     to open a repository is sane and compatible with config options.
 
     Extensions can monkeypatch this function to perform additional
     checking.
 
     ``error.RepoError`` should be raised on failure.
     """
     if b'exp-sparse' in requirements and not sparse.enabled:
         raise error.RepoError(
             _(
                 b'repository is using sparse feature but '
                 b'sparse is not enabled; enable the '
                 b'"sparse" extensions to access'
             )
         )
 
 
 def makestore(requirements, path, vfstype):
     """Construct a storage object for a repository."""
     if b'store' in requirements:
         if b'fncache' in requirements:
             return storemod.fncachestore(
                 path, vfstype, b'dotencode' in requirements
             )
 
         return storemod.encodedstore(path, vfstype)
 
     return storemod.basicstore(path, vfstype)
 
 
 def resolvestorevfsoptions(ui, requirements, features):
     """Resolve the options to pass to the store vfs opener.
 
     The returned dict is used to influence behavior of the storage layer.
     """
     options = {}
 
     if b'treemanifest' in requirements:
         options[b'treemanifest'] = True
 
     # experimental config: format.manifestcachesize
     manifestcachesize = ui.configint(b'format', b'manifestcachesize')
     if manifestcachesize is not None:
         options[b'manifestcachesize'] = manifestcachesize
 
     # In the absence of another requirement superseding a revlog-related
     # requirement, we have to assume the repo is using revlog version 0.
     # This revlog format is super old and we don't bother trying to parse
     # opener options for it because those options wouldn't do anything
     # meaningful on such old repos.
     if b'revlogv1' in requirements or REVLOGV2_REQUIREMENT in requirements:
         options.update(resolverevlogstorevfsoptions(ui, requirements, features))
     else:  # explicitly mark repo as using revlogv0
         options[b'revlogv0'] = True
 
     if COPIESSDC_REQUIREMENT in requirements:
         options[b'copies-storage'] = b'changeset-sidedata'
     else:
         writecopiesto = ui.config(b'experimental', b'copies.write-to')
         copiesextramode = (b'changeset-only', b'compatibility')
         if writecopiesto in copiesextramode:
             options[b'copies-storage'] = b'extra'
 
     return options
 
 
 def resolverevlogstorevfsoptions(ui, requirements, features):
     """Resolve opener options specific to revlogs."""
 
     options = {}
     options[b'flagprocessors'] = {}
 
     if b'revlogv1' in requirements:
         options[b'revlogv1'] = True
     if REVLOGV2_REQUIREMENT in requirements:
         options[b'revlogv2'] = True
 
     if b'generaldelta' in requirements:
         options[b'generaldelta'] = True
 
     # experimental config: format.chunkcachesize
     chunkcachesize = ui.configint(b'format', b'chunkcachesize')
     if chunkcachesize is not None:
         options[b'chunkcachesize'] = chunkcachesize
 
     deltabothparents = ui.configbool(
         b'storage', b'revlog.optimize-delta-parent-choice'
     )
     options[b'deltabothparents'] = deltabothparents
 
     lazydelta = ui.configbool(b'storage', b'revlog.reuse-external-delta')
     lazydeltabase = False
     if lazydelta:
         lazydeltabase = ui.configbool(
             b'storage', b'revlog.reuse-external-delta-parent'
         )
     if lazydeltabase is None:
         lazydeltabase = not scmutil.gddeltaconfig(ui)
     options[b'lazydelta'] = lazydelta
     options[b'lazydeltabase'] = lazydeltabase
 
     chainspan = ui.configbytes(b'experimental', b'maxdeltachainspan')
     if 0 <= chainspan:
         options[b'maxdeltachainspan'] = chainspan
 
     mmapindexthreshold = ui.configbytes(b'experimental', b'mmapindexthreshold')
     if mmapindexthreshold is not None:
         options[b'mmapindexthreshold'] = mmapindexthreshold
 
     withsparseread = ui.configbool(b'experimental', b'sparse-read')
     srdensitythres = float(
         ui.config(b'experimental', b'sparse-read.density-threshold')
     )
     srmingapsize = ui.configbytes(b'experimental', b'sparse-read.min-gap-size')
     options[b'with-sparse-read'] = withsparseread
     options[b'sparse-read-density-threshold'] = srdensitythres
     options[b'sparse-read-min-gap-size'] = srmingapsize
 
     sparserevlog = SPARSEREVLOG_REQUIREMENT in requirements
     options[b'sparse-revlog'] = sparserevlog
     if sparserevlog:
         options[b'generaldelta'] = True
 
     sidedata = SIDEDATA_REQUIREMENT in requirements
     options[b'side-data'] = sidedata
 
     maxchainlen = None
     if sparserevlog:
         maxchainlen = revlogconst.SPARSE_REVLOG_MAX_CHAIN_LENGTH
     # experimental config: format.maxchainlen
     maxchainlen = ui.configint(b'format', b'maxchainlen', maxchainlen)
     if maxchainlen is not None:
         options[b'maxchainlen'] = maxchainlen
 
     for r in requirements:
         # we allow multiple compression engine requirement to co-exist because
         # strickly speaking, revlog seems to support mixed compression style.
         #
         # The compression used for new entries will be "the last one"
         prefix = r.startswith
         if prefix(b'revlog-compression-') or prefix(b'exp-compression-'):
             options[b'compengine'] = r.split(b'-', 2)[2]
 
     options[b'zlib.level'] = ui.configint(b'storage', b'revlog.zlib.level')
     if options[b'zlib.level'] is not None:
         if not (0 <= options[b'zlib.level'] <= 9):
             msg = _(b'invalid value for `storage.revlog.zlib.level` config: %d')
             raise error.Abort(msg % options[b'zlib.level'])
     options[b'zstd.level'] = ui.configint(b'storage', b'revlog.zstd.level')
     if options[b'zstd.level'] is not None:
         if not (0 <= options[b'zstd.level'] <= 22):
             msg = _(b'invalid value for `storage.revlog.zstd.level` config: %d')
             raise error.Abort(msg % options[b'zstd.level'])
 
     if repository.NARROW_REQUIREMENT in requirements:
         options[b'enableellipsis'] = True
 
     if ui.configbool(b'experimental', b'rust.index'):
         options[b'rust.index'] = True
     if ui.configbool(b'experimental', b'exp-persistent-nodemap'):
         options[b'exp-persistent-nodemap'] = True
     if ui.configbool(b'experimental', b'exp-persistent-nodemap.mmap'):
         options[b'exp-persistent-nodemap.mmap'] = True
     if ui.configbool(b'devel', b'persistent-nodemap'):
         options[b'devel-force-nodemap'] = True
 
     return options
 
 
 def makemain(**kwargs):
     """Produce a type conforming to ``ilocalrepositorymain``."""
     return localrepository
 
 
 @interfaceutil.implementer(repository.ilocalrepositoryfilestorage)
 class revlogfilestorage(object):
     """File storage when using revlogs."""
 
     def file(self, path):
         if path[0] == b'/':
             path = path[1:]
 
         return filelog.filelog(self.svfs, path)
 
 
 @interfaceutil.implementer(repository.ilocalrepositoryfilestorage)
 class revlognarrowfilestorage(object):
     """File storage when using revlogs and narrow files."""
 
     def file(self, path):
         if path[0] == b'/':
             path = path[1:]
 
         return filelog.narrowfilelog(self.svfs, path, self._storenarrowmatch)
 
 
 def makefilestorage(requirements, features, **kwargs):
     """Produce a type conforming to ``ilocalrepositoryfilestorage``."""
     features.add(repository.REPO_FEATURE_REVLOG_FILE_STORAGE)
     features.add(repository.REPO_FEATURE_STREAM_CLONE)
 
     if repository.NARROW_REQUIREMENT in requirements:
         return revlognarrowfilestorage
     else:
         return revlogfilestorage
 
 
 # List of repository interfaces and factory functions for them. Each
 # will be called in order during ``makelocalrepository()`` to iteratively
 # derive the final type for a local repository instance. We capture the
 # function as a lambda so we don't hold a reference and the module-level
 # functions can be wrapped.
 REPO_INTERFACES = [
     (repository.ilocalrepositorymain, lambda: makemain),
     (repository.ilocalrepositoryfilestorage, lambda: makefilestorage),
 ]
 
 
 @interfaceutil.implementer(repository.ilocalrepositorymain)
 class localrepository(object):
     """Main class for representing local repositories.
 
     All local repositories are instances of this class.
 
     Constructed on its own, instances of this class are not usable as
     repository objects. To obtain a usable repository object, call
     ``hg.repository()``, ``localrepo.instance()``, or
     ``localrepo.makelocalrepository()``. The latter is the lowest-level.
     ``instance()`` adds support for creating new repositories.
     ``hg.repository()`` adds more extension integration, including calling
     ``reposetup()``. Generally speaking, ``hg.repository()`` should be
     used.
     """
 
     # obsolete experimental requirements:
     #  - manifestv2: An experimental new manifest format that allowed
     #    for stem compression of long paths. Experiment ended up not
     #    being successful (repository sizes went up due to worse delta
     #    chains), and the code was deleted in 4.6.
     supportedformats = {
         b'revlogv1',
         b'generaldelta',
         b'treemanifest',
         COPIESSDC_REQUIREMENT,
         REVLOGV2_REQUIREMENT,
         SIDEDATA_REQUIREMENT,
         SPARSEREVLOG_REQUIREMENT,
         bookmarks.BOOKMARKS_IN_STORE_REQUIREMENT,
     }
     _basesupported = supportedformats | {
         b'store',
         b'fncache',
         b'shared',
         b'relshared',
         b'dotencode',
         b'exp-sparse',
         b'internal-phase',
     }
 
     # list of prefix for file which can be written without 'wlock'
     # Extensions should extend this list when needed
     _wlockfreeprefix = {
         # We migh consider requiring 'wlock' for the next
         # two, but pretty much all the existing code assume
         # wlock is not needed so we keep them excluded for
         # now.
         b'hgrc',
         b'requires',
         # XXX cache is a complicatged business someone
         # should investigate this in depth at some point
         b'cache/',
         # XXX shouldn't be dirstate covered by the wlock?
         b'dirstate',
         # XXX bisect was still a bit too messy at the time
         # this changeset was introduced. Someone should fix
         # the remainig bit and drop this line
         b'bisect.state',
     }
 
     def __init__(
         self,
         baseui,
         ui,
         origroot,
         wdirvfs,
         hgvfs,
         requirements,
         supportedrequirements,
         sharedpath,
         store,
         cachevfs,
         wcachevfs,
         features,
         intents=None,
     ):
         """Create a new local repository instance.
 
         Most callers should use ``hg.repository()``, ``localrepo.instance()``,
         or ``localrepo.makelocalrepository()`` for obtaining a new repository
         object.
 
         Arguments:
 
         baseui
            ``ui.ui`` instance that ``ui`` argument was based off of.
 
         ui
            ``ui.ui`` instance for use by the repository.
 
         origroot
            ``bytes`` path to working directory root of this repository.
 
         wdirvfs
            ``vfs.vfs`` rooted at the working directory.
 
         hgvfs
            ``vfs.vfs`` rooted at .hg/
 
         requirements
            ``set`` of bytestrings representing repository opening requirements.
 
         supportedrequirements
            ``set`` of bytestrings representing repository requirements that we
            know how to open. May be a supetset of ``requirements``.
 
         sharedpath
            ``bytes`` Defining path to storage base directory. Points to a
            ``.hg/`` directory somewhere.
 
         store
            ``store.basicstore`` (or derived) instance providing access to
            versioned storage.
 
         cachevfs
            ``vfs.vfs`` used for cache files.
 
         wcachevfs
            ``vfs.vfs`` used for cache files related to the working copy.
 
         features
            ``set`` of bytestrings defining features/capabilities of this
            instance.
 
         intents
            ``set`` of system strings indicating what this repo will be used
            for.
         """
         self.baseui = baseui
         self.ui = ui
         self.origroot = origroot
         # vfs rooted at working directory.
         self.wvfs = wdirvfs
         self.root = wdirvfs.base
         # vfs rooted at .hg/. Used to access most non-store paths.
         self.vfs = hgvfs
         self.path = hgvfs.base
         self.requirements = requirements
         self.supported = supportedrequirements
         self.sharedpath = sharedpath
         self.store = store
         self.cachevfs = cachevfs
         self.wcachevfs = wcachevfs
         self.features = features
 
         self.filtername = None
 
         if self.ui.configbool(b'devel', b'all-warnings') or self.ui.configbool(
             b'devel', b'check-locks'
         ):
             self.vfs.audit = self._getvfsward(self.vfs.audit)
         # A list of callback to shape the phase if no data were found.
         # Callback are in the form: func(repo, roots) --> processed root.
         # This list it to be filled by extension during repo setup
         self._phasedefaults = []
 
         color.setup(self.ui)
 
         self.spath = self.store.path
         self.svfs = self.store.vfs
         self.sjoin = self.store.join
         if self.ui.configbool(b'devel', b'all-warnings') or self.ui.configbool(
             b'devel', b'check-locks'
         ):
             if util.safehasattr(self.svfs, b'vfs'):  # this is filtervfs
                 self.svfs.vfs.audit = self._getsvfsward(self.svfs.vfs.audit)
             else:  # standard vfs
                 self.svfs.audit = self._getsvfsward(self.svfs.audit)
 
         self._dirstatevalidatewarned = False
 
         self._branchcaches = branchmap.BranchMapCache()
         self._revbranchcache = None
         self._filterpats = {}
         self._datafilters = {}
         self._transref = self._lockref = self._wlockref = None
 
         # A cache for various files under .hg/ that tracks file changes,
         # (used by the filecache decorator)
         #
         # Maps a property name to its util.filecacheentry
         self._filecache = {}
 
         # hold sets of revision to be filtered
         # should be cleared when something might have changed the filter value:
         # - new changesets,
         # - phase change,
         # - new obsolescence marker,
         # - working directory parent change,
         # - bookmark changes
         self.filteredrevcache = {}
 
         # post-dirstate-status hooks
         self._postdsstatus = []
 
         # generic mapping between names and nodes
         self.names = namespaces.namespaces()
 
         # Key to signature value.
         self._sparsesignaturecache = {}
         # Signature to cached matcher instance.
         self._sparsematchercache = {}
 
         self._extrafilterid = repoview.extrafilter(ui)
 
         self.filecopiesmode = None
         if COPIESSDC_REQUIREMENT in self.requirements:
             self.filecopiesmode = b'changeset-sidedata'
 
     def _getvfsward(self, origfunc):
         """build a ward for self.vfs"""
         rref = weakref.ref(self)
 
         def checkvfs(path, mode=None):
             ret = origfunc(path, mode=mode)
             repo = rref()
             if (
                 repo is None
                 or not util.safehasattr(repo, b'_wlockref')
                 or not util.safehasattr(repo, b'_lockref')
             ):
                 return
             if mode in (None, b'r', b'rb'):
                 return
             if path.startswith(repo.path):
                 # truncate name relative to the repository (.hg)
                 path = path[len(repo.path) + 1 :]
             if path.startswith(b'cache/'):
                 msg = b'accessing cache with vfs instead of cachevfs: "%s"'
                 repo.ui.develwarn(msg % path, stacklevel=3, config=b"cache-vfs")
             if path.startswith(b'journal.') or path.startswith(b'undo.'):
                 # journal is covered by 'lock'
                 if repo._currentlock(repo._lockref) is None:
                     repo.ui.develwarn(
                         b'write with no lock: "%s"' % path,
                         stacklevel=3,
                         config=b'check-locks',
                     )
             elif repo._currentlock(repo._wlockref) is None:
                 # rest of vfs files are covered by 'wlock'
                 #
                 # exclude special files
                 for prefix in self._wlockfreeprefix:
                     if path.startswith(prefix):
                         return
                 repo.ui.develwarn(
                     b'write with no wlock: "%s"' % path,
                     stacklevel=3,
                     config=b'check-locks',
                 )
             return ret
 
         return checkvfs
 
     def _getsvfsward(self, origfunc):
         """build a ward for self.svfs"""
         rref = weakref.ref(self)
 
         def checksvfs(path, mode=None):
             ret = origfunc(path, mode=mode)
             repo = rref()
             if repo is None or not util.safehasattr(repo, b'_lockref'):
                 return
             if mode in (None, b'r', b'rb'):
                 return
             if path.startswith(repo.sharedpath):
                 # truncate name relative to the repository (.hg)
                 path = path[len(repo.sharedpath) + 1 :]
             if repo._currentlock(repo._lockref) is None:
                 repo.ui.develwarn(
                     b'write with no lock: "%s"' % path, stacklevel=4
                 )
             return ret
 
         return checksvfs
 
     def close(self):
         self._writecaches()
 
     def _writecaches(self):
         if self._revbranchcache:
             self._revbranchcache.write()
 
     def _restrictcapabilities(self, caps):
         if self.ui.configbool(b'experimental', b'bundle2-advertise'):
             caps = set(caps)
             capsblob = bundle2.encodecaps(
                 bundle2.getrepocaps(self, role=b'client')
             )
             caps.add(b'bundle2=' + urlreq.quote(capsblob))
         return caps
 
     def _writerequirements(self):
         scmutil.writerequires(self.vfs, self.requirements)
 
     # Don't cache auditor/nofsauditor, or you'll end up with reference cycle:
     # self -> auditor -> self._checknested -> self
 
     @property
     def auditor(self):
         # This is only used by context.workingctx.match in order to
         # detect files in subrepos.
         return pathutil.pathauditor(self.root, callback=self._checknested)
 
     @property
     def nofsauditor(self):
         # This is only used by context.basectx.match in order to detect
         # files in subrepos.
         return pathutil.pathauditor(
             self.root, callback=self._checknested, realfs=False, cached=True
         )
 
     def _checknested(self, path):
         """Determine if path is a legal nested repository."""
         if not path.startswith(self.root):
             return False
         subpath = path[len(self.root) + 1 :]
         normsubpath = util.pconvert(subpath)
 
         # XXX: Checking against the current working copy is wrong in
         # the sense that it can reject things like
         #
         #   $ hg cat -r 10 sub/x.txt
         #
         # if sub/ is no longer a subrepository in the working copy
         # parent revision.
         #
         # However, it can of course also allow things that would have
         # been rejected before, such as the above cat command if sub/
         # is a subrepository now, but was a normal directory before.
         # The old path auditor would have rejected by mistake since it
         # panics when it sees sub/.hg/.
         #
         # All in all, checking against the working copy seems sensible
         # since we want to prevent access to nested repositories on
         # the filesystem *now*.
         ctx = self[None]
         parts = util.splitpath(subpath)
         while parts:
             prefix = b'/'.join(parts)
             if prefix in ctx.substate:
                 if prefix == normsubpath:
                     return True
                 else:
                     sub = ctx.sub(prefix)
                     return sub.checknested(subpath[len(prefix) + 1 :])
             else:
                 parts.pop()
         return False
 
     def peer(self):
         return localpeer(self)  # not cached to avoid reference cycle
 
     def unfiltered(self):
         """Return unfiltered version of the repository
 
         Intended to be overwritten by filtered repo."""
         return self
 
     def filtered(self, name, visibilityexceptions=None):
         """Return a filtered version of a repository
 
         The `name` parameter is the identifier of the requested view. This
         will return a repoview object set "exactly" to the specified view.
 
         This function does not apply recursive filtering to a repository. For
         example calling `repo.filtered("served")` will return a repoview using
         the "served" view, regardless of the initial view used by `repo`.
 
         In other word, there is always only one level of `repoview` "filtering".
         """
         if self._extrafilterid is not None and b'%' not in name:
             name = name + b'%' + self._extrafilterid
 
         cls = repoview.newtype(self.unfiltered().__class__)
         return cls(self, name, visibilityexceptions)
 
     @mixedrepostorecache(
         (b'bookmarks', b'plain'),
         (b'bookmarks.current', b'plain'),
         (b'bookmarks', b''),
         (b'00changelog.i', b''),
     )
     def _bookmarks(self):
         # Since the multiple files involved in the transaction cannot be
         # written atomically (with current repository format), there is a race
         # condition here.
         #
         # 1) changelog content A is read
         # 2) outside transaction update changelog to content B
         # 3) outside transaction update bookmark file referring to content B
         # 4) bookmarks file content is read and filtered against changelog-A
         #
         # When this happens, bookmarks against nodes missing from A are dropped.
         #
         # Having this happening during read is not great, but it become worse
         # when this happen during write because the bookmarks to the "unknown"
         # nodes will be dropped for good. However, writes happen within locks.
         # This locking makes it possible to have a race free consistent read.
         # For this purpose data read from disc before locking  are
         # "invalidated" right after the locks are taken. This invalidations are
         # "light", the `filecache` mechanism keep the data in memory and will
         # reuse them if the underlying files did not changed. Not parsing the
         # same data multiple times helps performances.
         #
         # Unfortunately in the case describe above, the files tracked by the
         # bookmarks file cache might not have changed, but the in-memory
         # content is still "wrong" because we used an older changelog content
         # to process the on-disk data. So after locking, the changelog would be
         # refreshed but `_bookmarks` would be preserved.
         # Adding `00changelog.i` to the list of tracked file is not
         # enough, because at the time we build the content for `_bookmarks` in
         # (4), the changelog file has already diverged from the content used
         # for loading `changelog` in (1)
         #
         # To prevent the issue, we force the changelog to be explicitly
         # reloaded while computing `_bookmarks`. The data race can still happen
         # without the lock (with a narrower window), but it would no longer go
         # undetected during the lock time refresh.
         #
         # The new schedule is as follow
         #
         # 1) filecache logic detect that `_bookmarks` needs to be computed
         # 2) cachestat for `bookmarks` and `changelog` are captured (for book)
         # 3) We force `changelog` filecache to be tested
         # 4) cachestat for `changelog` are captured (for changelog)
         # 5) `_bookmarks` is computed and cached
         #
         # The step in (3) ensure we have a changelog at least as recent as the
         # cache stat computed in (1). As a result at locking time:
         #  * if the changelog did not changed since (1) -> we can reuse the data
         #  * otherwise -> the bookmarks get refreshed.
         self._refreshchangelog()
         return bookmarks.bmstore(self)
 
     def _refreshchangelog(self):
         """make sure the in memory changelog match the on-disk one"""
         if 'changelog' in vars(self) and self.currenttransaction() is None:
             del self.changelog
 
     @property
     def _activebookmark(self):
         return self._bookmarks.active
 
     # _phasesets depend on changelog. what we need is to call
     # _phasecache.invalidate() if '00changelog.i' was changed, but it
     # can't be easily expressed in filecache mechanism.
     @storecache(b'phaseroots', b'00changelog.i')
     def _phasecache(self):
         return phases.phasecache(self, self._phasedefaults)
 
     @storecache(b'obsstore')
     def obsstore(self):
         return obsolete.makestore(self.ui, self)
 
     @storecache(b'00changelog.i')
     def changelog(self):
         return self.store.changelog(txnutil.mayhavepending(self.root))
 
     @storecache(b'00manifest.i')
     def manifestlog(self):
         return self.store.manifestlog(self, self._storenarrowmatch)
 
     @repofilecache(b'dirstate')
     def dirstate(self):
         return self._makedirstate()
 
     def _makedirstate(self):
         """Extension point for wrapping the dirstate per-repo."""
         sparsematchfn = lambda: sparse.matcher(self)
 
         return dirstate.dirstate(
             self.vfs, self.ui, self.root, self._dirstatevalidate, sparsematchfn
         )
 
     def _dirstatevalidate(self, node):
         try:
             self.changelog.rev(node)
             return node
         except error.LookupError:
             if not self._dirstatevalidatewarned:
                 self._dirstatevalidatewarned = True
                 self.ui.warn(
                     _(b"warning: ignoring unknown working parent %s!\n")
                     % short(node)
                 )
             return nullid
 
     @storecache(narrowspec.FILENAME)
     def narrowpats(self):
         """matcher patterns for this repository's narrowspec
 
         A tuple of (includes, excludes).
         """
         return narrowspec.load(self)
 
     @storecache(narrowspec.FILENAME)
     def _storenarrowmatch(self):
         if repository.NARROW_REQUIREMENT not in self.requirements:
             return matchmod.always()
         include, exclude = self.narrowpats
         return narrowspec.match(self.root, include=include, exclude=exclude)
 
     @storecache(narrowspec.FILENAME)
     def _narrowmatch(self):
         if repository.NARROW_REQUIREMENT not in self.requirements:
             return matchmod.always()
         narrowspec.checkworkingcopynarrowspec(self)
         include, exclude = self.narrowpats
         return narrowspec.match(self.root, include=include, exclude=exclude)
 
     def narrowmatch(self, match=None, includeexact=False):
         """matcher corresponding the the repo's narrowspec
 
         If `match` is given, then that will be intersected with the narrow
         matcher.
 
         If `includeexact` is True, then any exact matches from `match` will
         be included even if they're outside the narrowspec.
         """
         if match:
             if includeexact and not self._narrowmatch.always():
                 # do not exclude explicitly-specified paths so that they can
                 # be warned later on
                 em = matchmod.exact(match.files())
                 nm = matchmod.unionmatcher([self._narrowmatch, em])
                 return matchmod.intersectmatchers(match, nm)
             return matchmod.intersectmatchers(match, self._narrowmatch)
         return self._narrowmatch
 
     def setnarrowpats(self, newincludes, newexcludes):
         narrowspec.save(self, newincludes, newexcludes)
         self.invalidate(clearfilecache=True)
 
     @unfilteredpropertycache
     def _quick_access_changeid_null(self):
         return {
             b'null': (nullrev, nullid),
             nullrev: (nullrev, nullid),
             nullid: (nullrev, nullid),
         }
 
     @unfilteredpropertycache
     def _quick_access_changeid_wc(self):
         # also fast path access to the working copy parents
         # however, only do it for filter that ensure wc is visible.
         quick = {}
         cl = self.unfiltered().changelog
         for node in self.dirstate.parents():
             if node == nullid:
                 continue
             rev = cl.index.get_rev(node)
             if rev is None:
                 # unknown working copy parent case:
                 #
                 #   skip the fast path and let higher code deal with it
                 continue
             pair = (rev, node)
             quick[rev] = pair
             quick[node] = pair
             # also add the parents of the parents
             for r in cl.parentrevs(rev):
                 if r == nullrev:
                     continue
                 n = cl.node(r)
                 pair = (r, n)
                 quick[r] = pair
                 quick[n] = pair
         p1node = self.dirstate.p1()
         if p1node != nullid:
             quick[b'.'] = quick[p1node]
         return quick
 
     @unfilteredmethod
     def _quick_access_changeid_invalidate(self):
         if '_quick_access_changeid_wc' in vars(self):
             del self.__dict__['_quick_access_changeid_wc']
 
     @property
     def _quick_access_changeid(self):
         """an helper dictionnary for __getitem__ calls
 
         This contains a list of symbol we can recognise right away without
         further processing.
         """
         mapping = self._quick_access_changeid_null
         if self.filtername in repoview.filter_has_wc:
             mapping = mapping.copy()
             mapping.update(self._quick_access_changeid_wc)
         return mapping
 
     def __getitem__(self, changeid):
         # dealing with special cases
         if changeid is None:
             return context.workingctx(self)
         if isinstance(changeid, context.basectx):
             return changeid
 
         # dealing with multiple revisions
         if isinstance(changeid, slice):
             # wdirrev isn't contiguous so the slice shouldn't include it
             return [
                 self[i]
                 for i in pycompat.xrange(*changeid.indices(len(self)))
                 if i not in self.changelog.filteredrevs
             ]
 
         # dealing with some special values
         quick_access = self._quick_access_changeid.get(changeid)
         if quick_access is not None:
             rev, node = quick_access
             return context.changectx(self, rev, node, maybe_filtered=False)
         if changeid == b'tip':
             node = self.changelog.tip()
             rev = self.changelog.rev(node)
             return context.changectx(self, rev, node)
 
         # dealing with arbitrary values
         try:
             if isinstance(changeid, int):
                 node = self.changelog.node(changeid)
                 rev = changeid
             elif changeid == b'.':
                 # this is a hack to delay/avoid loading obsmarkers
                 # when we know that '.' won't be hidden
                 node = self.dirstate.p1()
                 rev = self.unfiltered().changelog.rev(node)
             elif len(changeid) == 20:
                 try:
                     node = changeid
                     rev = self.changelog.rev(changeid)
                 except error.FilteredLookupError:
                     changeid = hex(changeid)  # for the error message
                     raise
                 except LookupError:
                     # check if it might have come from damaged dirstate
                     #
                     # XXX we could avoid the unfiltered if we had a recognizable
                     # exception for filtered changeset access
                     if (
                         self.local()
                         and changeid in self.unfiltered().dirstate.parents()
                     ):
                         msg = _(b"working directory has unknown parent '%s'!")
                         raise error.Abort(msg % short(changeid))
                     changeid = hex(changeid)  # for the error message
                     raise
 
             elif len(changeid) == 40:
                 node = bin(changeid)
                 rev = self.changelog.rev(node)
             else:
                 raise error.ProgrammingError(
                     b"unsupported changeid '%s' of type %s"
                     % (changeid, pycompat.bytestr(type(changeid)))
                 )
 
             return context.changectx(self, rev, node)
 
         except (error.FilteredIndexError, error.FilteredLookupError):
             raise error.FilteredRepoLookupError(
                 _(b"filtered revision '%s'") % pycompat.bytestr(changeid)
             )
         except (IndexError, LookupError):
             raise error.RepoLookupError(
                 _(b"unknown revision '%s'") % pycompat.bytestr(changeid)
             )
         except error.WdirUnsupported:
             return context.workingctx(self)
 
     def __contains__(self, changeid):
         """True if the given changeid exists
 
         error.AmbiguousPrefixLookupError is raised if an ambiguous node
         specified.
         """
         try:
             self[changeid]
             return True
         except error.RepoLookupError:
             return False
 
     def __nonzero__(self):
         return True
 
     __bool__ = __nonzero__
 
     def __len__(self):
         # no need to pay the cost of repoview.changelog
         unfi = self.unfiltered()
         return len(unfi.changelog)
 
     def __iter__(self):
         return iter(self.changelog)
 
     def revs(self, expr, *args):
         '''Find revisions matching a revset.
 
         The revset is specified as a string ``expr`` that may contain
         %-formatting to escape certain types. See ``revsetlang.formatspec``.
 
         Revset aliases from the configuration are not expanded. To expand
         user aliases, consider calling ``scmutil.revrange()`` or
         ``repo.anyrevs([expr], user=True)``.
 
         Returns a smartset.abstractsmartset, which is a list-like interface
         that contains integer revisions.
         '''
         tree = revsetlang.spectree(expr, *args)
         return revset.makematcher(tree)(self)
 
     def set(self, expr, *args):
         '''Find revisions matching a revset and emit changectx instances.
 
         This is a convenience wrapper around ``revs()`` that iterates the
         result and is a generator of changectx instances.
 
         Revset aliases from the configuration are not expanded. To expand
         user aliases, consider calling ``scmutil.revrange()``.
         '''
         for r in self.revs(expr, *args):
             yield self[r]
 
     def anyrevs(self, specs, user=False, localalias=None):
         '''Find revisions matching one of the given revsets.
 
         Revset aliases from the configuration are not expanded by default. To
         expand user aliases, specify ``user=True``. To provide some local
         definitions overriding user aliases, set ``localalias`` to
         ``{name: definitionstring}``.
         '''
         if specs == [b'null']:
             return revset.baseset([nullrev])
         if specs == [b'.']:
             quick_data = self._quick_access_changeid.get(b'.')
             if quick_data is not None:
                 return revset.baseset([quick_data[0]])
         if user:
             m = revset.matchany(
                 self.ui,
                 specs,
                 lookup=revset.lookupfn(self),
                 localalias=localalias,
             )
         else:
             m = revset.matchany(None, specs, localalias=localalias)
         return m(self)
 
     def url(self):
         return b'file:' + self.root
 
     def hook(self, name, throw=False, **args):
         """Call a hook, passing this repo instance.
 
         This a convenience method to aid invoking hooks. Extensions likely
         won't call this unless they have registered a custom hook or are
         replacing code that is expected to call a hook.
         """
         return hook.hook(self.ui, self, name, throw, **args)
 
     @filteredpropertycache
     def _tagscache(self):
         '''Returns a tagscache object that contains various tags related
         caches.'''
 
         # This simplifies its cache management by having one decorated
         # function (this one) and the rest simply fetch things from it.
         class tagscache(object):
             def __init__(self):
                 # These two define the set of tags for this repository. tags
                 # maps tag name to node; tagtypes maps tag name to 'global' or
                 # 'local'. (Global tags are defined by .hgtags across all
                 # heads, and local tags are defined in .hg/localtags.)
                 # They constitute the in-memory cache of tags.
                 self.tags = self.tagtypes = None
 
                 self.nodetagscache = self.tagslist = None
 
         cache = tagscache()
         cache.tags, cache.tagtypes = self._findtags()
 
         return cache
 
     def tags(self):
         '''return a mapping of tag to node'''
         t = {}
         if self.changelog.filteredrevs:
             tags, tt = self._findtags()
         else:
             tags = self._tagscache.tags
         rev = self.changelog.rev
         for k, v in pycompat.iteritems(tags):
             try:
                 # ignore tags to unknown nodes
                 rev(v)
                 t[k] = v
             except (error.LookupError, ValueError):
                 pass
         return t
 
     def _findtags(self):
         '''Do the hard work of finding tags.  Return a pair of dicts
         (tags, tagtypes) where tags maps tag name to node, and tagtypes
         maps tag name to a string like \'global\' or \'local\'.
         Subclasses or extensions are free to add their own tags, but
         should be aware that the returned dicts will be retained for the
         duration of the localrepo object.'''
 
         # XXX what tagtype should subclasses/extensions use?  Currently
         # mq and bookmarks add tags, but do not set the tagtype at all.
         # Should each extension invent its own tag type?  Should there
         # be one tagtype for all such "virtual" tags?  Or is the status
         # quo fine?
 
         # map tag name to (node, hist)
         alltags = tagsmod.findglobaltags(self.ui, self)
         # map tag name to tag type
         tagtypes = {tag: b'global' for tag in alltags}
 
         tagsmod.readlocaltags(self.ui, self, alltags, tagtypes)
 
         # Build the return dicts.  Have to re-encode tag names because
         # the tags module always uses UTF-8 (in order not to lose info
         # writing to the cache), but the rest of Mercurial wants them in
         # local encoding.
         tags = {}
         for (name, (node, hist)) in pycompat.iteritems(alltags):
             if node != nullid:
                 tags[encoding.tolocal(name)] = node
         tags[b'tip'] = self.changelog.tip()
         tagtypes = {
             encoding.tolocal(name): value
             for (name, value) in pycompat.iteritems(tagtypes)
         }
         return (tags, tagtypes)
 
     def tagtype(self, tagname):
         '''
         return the type of the given tag. result can be:
 
         'local'  : a local tag
         'global' : a global tag
         None     : tag does not exist
         '''
 
         return self._tagscache.tagtypes.get(tagname)
 
     def tagslist(self):
         '''return a list of tags ordered by revision'''
         if not self._tagscache.tagslist:
             l = []
             for t, n in pycompat.iteritems(self.tags()):
                 l.append((self.changelog.rev(n), t, n))
             self._tagscache.tagslist = [(t, n) for r, t, n in sorted(l)]
 
         return self._tagscache.tagslist
 
     def nodetags(self, node):
         '''return the tags associated with a node'''
         if not self._tagscache.nodetagscache:
             nodetagscache = {}
             for t, n in pycompat.iteritems(self._tagscache.tags):
                 nodetagscache.setdefault(n, []).append(t)
             for tags in pycompat.itervalues(nodetagscache):
                 tags.sort()
             self._tagscache.nodetagscache = nodetagscache
         return self._tagscache.nodetagscache.get(node, [])
 
     def nodebookmarks(self, node):
         """return the list of bookmarks pointing to the specified node"""
         return self._bookmarks.names(node)
 
     def branchmap(self):
         '''returns a dictionary {branch: [branchheads]} with branchheads
         ordered by increasing revision number'''
         return self._branchcaches[self]
 
     @unfilteredmethod
     def revbranchcache(self):
         if not self._revbranchcache:
             self._revbranchcache = branchmap.revbranchcache(self.unfiltered())
         return self._revbranchcache
 
     def branchtip(self, branch, ignoremissing=False):
         '''return the tip node for a given branch
 
         If ignoremissing is True, then this method will not raise an error.
         This is helpful for callers that only expect None for a missing branch
         (e.g. namespace).
 
         '''
         try:
             return self.branchmap().branchtip(branch)
         except KeyError:
             if not ignoremissing:
                 raise error.RepoLookupError(_(b"unknown branch '%s'") % branch)
             else:
                 pass
 
     def lookup(self, key):
         node = scmutil.revsymbol(self, key).node()
         if node is None:
             raise error.RepoLookupError(_(b"unknown revision '%s'") % key)
         return node
 
     def lookupbranch(self, key):
         if self.branchmap().hasbranch(key):
             return key
 
         return scmutil.revsymbol(self, key).branch()
 
     def known(self, nodes):
         cl = self.changelog
         get_rev = cl.index.get_rev
         filtered = cl.filteredrevs
         result = []
         for n in nodes:
             r = get_rev(n)
             resp = not (r is None or r in filtered)
             result.append(resp)
         return result
 
     def local(self):
         return self
 
     def publishing(self):
         # it's safe (and desirable) to trust the publish flag unconditionally
         # so that we don't finalize changes shared between users via ssh or nfs
         return self.ui.configbool(b'phases', b'publish', untrusted=True)
 
     def cancopy(self):
         # so statichttprepo's override of local() works
         if not self.local():
             return False
         if not self.publishing():
             return True
         # if publishing we can't copy if there is filtered content
         return not self.filtered(b'visible').changelog.filteredrevs
 
     def shared(self):
         '''the type of shared repository (None if not shared)'''
         if self.sharedpath != self.path:
             return b'store'
         return None
 
     def wjoin(self, f, *insidef):
         return self.vfs.reljoin(self.root, f, *insidef)
 
     def setparents(self, p1, p2=nullid):
         self[None].setparents(p1, p2)
         self._quick_access_changeid_invalidate()
 
     def filectx(self, path, changeid=None, fileid=None, changectx=None):
         """changeid must be a changeset revision, if specified.
            fileid can be a file revision or node."""
         return context.filectx(
             self, path, changeid, fileid, changectx=changectx
         )
 
     def getcwd(self):
         return self.dirstate.getcwd()
 
     def pathto(self, f, cwd=None):
         return self.dirstate.pathto(f, cwd)
 
     def _loadfilter(self, filter):
         if filter not in self._filterpats:
             l = []
             for pat, cmd in self.ui.configitems(filter):
                 if cmd == b'!':
                     continue
                 mf = matchmod.match(self.root, b'', [pat])
                 fn = None
                 params = cmd
                 for name, filterfn in pycompat.iteritems(self._datafilters):
                     if cmd.startswith(name):
                         fn = filterfn
                         params = cmd[len(name) :].lstrip()
                         break
                 if not fn:
                     fn = lambda s, c, **kwargs: procutil.filter(s, c)
                     fn.__name__ = 'commandfilter'
                 # Wrap old filters not supporting keyword arguments
                 if not pycompat.getargspec(fn)[2]:
                     oldfn = fn
                     fn = lambda s, c, oldfn=oldfn, **kwargs: oldfn(s, c)
                     fn.__name__ = 'compat-' + oldfn.__name__
                 l.append((mf, fn, params))
             self._filterpats[filter] = l
         return self._filterpats[filter]
 
     def _filter(self, filterpats, filename, data):
         for mf, fn, cmd in filterpats:
             if mf(filename):
                 self.ui.debug(
                     b"filtering %s through %s\n"
                     % (filename, cmd or pycompat.sysbytes(fn.__name__))
                 )
                 data = fn(data, cmd, ui=self.ui, repo=self, filename=filename)
                 break
 
         return data
 
     @unfilteredpropertycache
     def _encodefilterpats(self):
         return self._loadfilter(b'encode')
 
     @unfilteredpropertycache
     def _decodefilterpats(self):
         return self._loadfilter(b'decode')
 
     def adddatafilter(self, name, filter):
         self._datafilters[name] = filter
 
     def wread(self, filename):
         if self.wvfs.islink(filename):
             data = self.wvfs.readlink(filename)
         else:
             data = self.wvfs.read(filename)
         return self._filter(self._encodefilterpats, filename, data)
 
     def wwrite(self, filename, data, flags, backgroundclose=False, **kwargs):
         """write ``data`` into ``filename`` in the working directory
 
         This returns length of written (maybe decoded) data.
         """
         data = self._filter(self._decodefilterpats, filename, data)
         if b'l' in flags:
             self.wvfs.symlink(data, filename)
         else:
             self.wvfs.write(
                 filename, data, backgroundclose=backgroundclose, **kwargs
             )
             if b'x' in flags:
                 self.wvfs.setflags(filename, False, True)
             else:
                 self.wvfs.setflags(filename, False, False)
         return len(data)
 
     def wwritedata(self, filename, data):
         return self._filter(self._decodefilterpats, filename, data)
 
     def currenttransaction(self):
         """return the current transaction or None if non exists"""
         if self._transref:
             tr = self._transref()
         else:
             tr = None
 
         if tr and tr.running():
             return tr
         return None
 
     def transaction(self, desc, report=None):
         if self.ui.configbool(b'devel', b'all-warnings') or self.ui.configbool(
             b'devel', b'check-locks'
         ):
             if self._currentlock(self._lockref) is None:
                 raise error.ProgrammingError(b'transaction requires locking')
         tr = self.currenttransaction()
         if tr is not None:
             return tr.nest(name=desc)
 
         # abort here if the journal already exists
         if self.svfs.exists(b"journal"):
             raise error.RepoError(
                 _(b"abandoned transaction found"),
                 hint=_(b"run 'hg recover' to clean up transaction"),
             )
 
         idbase = b"%.40f#%f" % (random.random(), time.time())
         ha = hex(hashutil.sha1(idbase).digest())
         txnid = b'TXN:' + ha
         self.hook(b'pretxnopen', throw=True, txnname=desc, txnid=txnid)
 
         self._writejournal(desc)
         renames = [(vfs, x, undoname(x)) for vfs, x in self._journalfiles()]
         if report:
             rp = report
         else:
             rp = self.ui.warn
         vfsmap = {b'plain': self.vfs, b'store': self.svfs}  # root of .hg/
         # we must avoid cyclic reference between repo and transaction.
         reporef = weakref.ref(self)
         # Code to track tag movement
         #
         # Since tags are all handled as file content, it is actually quite hard
         # to track these movement from a code perspective. So we fallback to a
         # tracking at the repository level. One could envision to track changes
         # to the '.hgtags' file through changegroup apply but that fails to
         # cope with case where transaction expose new heads without changegroup
         # being involved (eg: phase movement).
         #
         # For now, We gate the feature behind a flag since this likely comes
         # with performance impacts. The current code run more often than needed
         # and do not use caches as much as it could.  The current focus is on
         # the behavior of the feature so we disable it by default. The flag
         # will be removed when we are happy with the performance impact.
         #
         # Once this feature is no longer experimental move the following
         # documentation to the appropriate help section:
         #
         # The ``HG_TAG_MOVED`` variable will be set if the transaction touched
         # tags (new or changed or deleted tags). In addition the details of
         # these changes are made available in a file at:
         #     ``REPOROOT/.hg/changes/tags.changes``.
         # Make sure you check for HG_TAG_MOVED before reading that file as it
         # might exist from a previous transaction even if no tag were touched
         # in this one. Changes are recorded in a line base format::
         #
         #     <action> <hex-node> <tag-name>\n
         #
         # Actions are defined as follow:
         #   "-R": tag is removed,
         #   "+A": tag is added,
         #   "-M": tag is moved (old value),
         #   "+M": tag is moved (new value),
         tracktags = lambda x: None
         # experimental config: experimental.hook-track-tags
         shouldtracktags = self.ui.configbool(
             b'experimental', b'hook-track-tags'
         )
         if desc != b'strip' and shouldtracktags:
             oldheads = self.changelog.headrevs()
 
             def tracktags(tr2):
                 repo = reporef()
                 oldfnodes = tagsmod.fnoderevs(repo.ui, repo, oldheads)
                 newheads = repo.changelog.headrevs()
                 newfnodes = tagsmod.fnoderevs(repo.ui, repo, newheads)
                 # notes: we compare lists here.
                 # As we do it only once buiding set would not be cheaper
                 changes = tagsmod.difftags(repo.ui, repo, oldfnodes, newfnodes)
                 if changes:
                     tr2.hookargs[b'tag_moved'] = b'1'
                     with repo.vfs(
                         b'changes/tags.changes', b'w', atomictemp=True
                     ) as changesfile:
                         # note: we do not register the file to the transaction
                         # because we needs it to still exist on the transaction
                         # is close (for txnclose hooks)
                         tagsmod.writediff(changesfile, changes)
 
         def validate(tr2):
             """will run pre-closing hooks"""
             # XXX the transaction API is a bit lacking here so we take a hacky
             # path for now
             #
             # We cannot add this as a "pending" hooks since the 'tr.hookargs'
             # dict is copied before these run. In addition we needs the data
             # available to in memory hooks too.
             #
             # Moreover, we also need to make sure this runs before txnclose
             # hooks and there is no "pending" mechanism that would execute
             # logic only if hooks are about to run.
             #
             # Fixing this limitation of the transaction is also needed to track
             # other families of changes (bookmarks, phases, obsolescence).
             #
             # This will have to be fixed before we remove the experimental
             # gating.
             tracktags(tr2)
             repo = reporef()
 
             singleheadopt = (b'experimental', b'single-head-per-branch')
             singlehead = repo.ui.configbool(*singleheadopt)
             if singlehead:
                 singleheadsub = repo.ui.configsuboptions(*singleheadopt)[1]
                 accountclosed = singleheadsub.get(
                     b"account-closed-heads", False
                 )
                 scmutil.enforcesinglehead(repo, tr2, desc, accountclosed)
             if hook.hashook(repo.ui, b'pretxnclose-bookmark'):
                 for name, (old, new) in sorted(
                     tr.changes[b'bookmarks'].items()
                 ):
                     args = tr.hookargs.copy()
                     args.update(bookmarks.preparehookargs(name, old, new))
                     repo.hook(
                         b'pretxnclose-bookmark',
                         throw=True,
                         **pycompat.strkwargs(args)
                     )
             if hook.hashook(repo.ui, b'pretxnclose-phase'):
                 cl = repo.unfiltered().changelog
                 for revs, (old, new) in tr.changes[b'phases']:
                     for rev in revs:
                         args = tr.hookargs.copy()
                         node = hex(cl.node(rev))
                         args.update(phases.preparehookargs(node, old, new))
                         repo.hook(
                             b'pretxnclose-phase',
                             throw=True,
                             **pycompat.strkwargs(args)
                         )
 
             repo.hook(
                 b'pretxnclose', throw=True, **pycompat.strkwargs(tr.hookargs)
             )
 
         def releasefn(tr, success):
             repo = reporef()
             if repo is None:
                 # If the repo has been GC'd (and this release function is being
                 # called from transaction.__del__), there's not much we can do,
                 # so just leave the unfinished transaction there and let the
                 # user run `hg recover`.
                 return
             if success:
                 # this should be explicitly invoked here, because
                 # in-memory changes aren't written out at closing
                 # transaction, if tr.addfilegenerator (via
                 # dirstate.write or so) isn't invoked while
                 # transaction running
                 repo.dirstate.write(None)
             else:
                 # discard all changes (including ones already written
                 # out) in this transaction
                 narrowspec.restorebackup(self, b'journal.narrowspec')
                 narrowspec.restorewcbackup(self, b'journal.narrowspec.dirstate')
                 repo.dirstate.restorebackup(None, b'journal.dirstate')
 
                 repo.invalidate(clearfilecache=True)
 
         tr = transaction.transaction(
             rp,
             self.svfs,
             vfsmap,
             b"journal",
             b"undo",
             aftertrans(renames),
             self.store.createmode,
             validator=validate,
             releasefn=releasefn,
             checkambigfiles=_cachedfiles,
             name=desc,
         )
         tr.changes[b'origrepolen'] = len(self)
         tr.changes[b'obsmarkers'] = set()
         tr.changes[b'phases'] = []
         tr.changes[b'bookmarks'] = {}
 
         tr.hookargs[b'txnid'] = txnid
         tr.hookargs[b'txnname'] = desc
         # note: writing the fncache only during finalize mean that the file is
         # outdated when running hooks. As fncache is used for streaming clone,
         # this is not expected to break anything that happen during the hooks.
         tr.addfinalize(b'flush-fncache', self.store.write)
 
         def txnclosehook(tr2):
             """To be run if transaction is successful, will schedule a hook run
             """
             # Don't reference tr2 in hook() so we don't hold a reference.
             # This reduces memory consumption when there are multiple
             # transactions per lock. This can likely go away if issue5045
             # fixes the function accumulation.
             hookargs = tr2.hookargs
 
             def hookfunc(unused_success):
                 repo = reporef()
                 if hook.hashook(repo.ui, b'txnclose-bookmark'):
                     bmchanges = sorted(tr.changes[b'bookmarks'].items())
                     for name, (old, new) in bmchanges:
                         args = tr.hookargs.copy()
                         args.update(bookmarks.preparehookargs(name, old, new))
                         repo.hook(
                             b'txnclose-bookmark',
                             throw=False,
                             **pycompat.strkwargs(args)
                         )
 
                 if hook.hashook(repo.ui, b'txnclose-phase'):
                     cl = repo.unfiltered().changelog
                     phasemv = sorted(
                         tr.changes[b'phases'], key=lambda r: r[0][0]
                     )
                     for revs, (old, new) in phasemv:
                         for rev in revs:
                             args = tr.hookargs.copy()
                             node = hex(cl.node(rev))
                             args.update(phases.preparehookargs(node, old, new))
                             repo.hook(
                                 b'txnclose-phase',
                                 throw=False,
                                 **pycompat.strkwargs(args)
                             )
 
                 repo.hook(
                     b'txnclose', throw=False, **pycompat.strkwargs(hookargs)
                 )
 
             reporef()._afterlock(hookfunc)
 
         tr.addfinalize(b'txnclose-hook', txnclosehook)
         # Include a leading "-" to make it happen before the transaction summary
         # reports registered via scmutil.registersummarycallback() whose names
         # are 00-txnreport etc. That way, the caches will be warm when the
         # callbacks run.
         tr.addpostclose(b'-warm-cache', self._buildcacheupdater(tr))
 
         def txnaborthook(tr2):
             """To be run if transaction is aborted
             """
             reporef().hook(
                 b'txnabort', throw=False, **pycompat.strkwargs(tr2.hookargs)
             )
 
         tr.addabort(b'txnabort-hook', txnaborthook)
         # avoid eager cache invalidation. in-memory data should be identical
         # to stored data if transaction has no error.
         tr.addpostclose(b'refresh-filecachestats', self._refreshfilecachestats)
         self._transref = weakref.ref(tr)
         scmutil.registersummarycallback(self, tr, desc)
         return tr
 
     def _journalfiles(self):
         return (
             (self.svfs, b'journal'),
             (self.svfs, b'journal.narrowspec'),
             (self.vfs, b'journal.narrowspec.dirstate'),
             (self.vfs, b'journal.dirstate'),
             (self.vfs, b'journal.branch'),
             (self.vfs, b'journal.desc'),
             (bookmarks.bookmarksvfs(self), b'journal.bookmarks'),
             (self.svfs, b'journal.phaseroots'),
         )
 
     def undofiles(self):
         return [(vfs, undoname(x)) for vfs, x in self._journalfiles()]
 
     @unfilteredmethod
     def _writejournal(self, desc):
         self.dirstate.savebackup(None, b'journal.dirstate')
         narrowspec.savewcbackup(self, b'journal.narrowspec.dirstate')
         narrowspec.savebackup(self, b'journal.narrowspec')
         self.vfs.write(
             b"journal.branch", encoding.fromlocal(self.dirstate.branch())
         )
         self.vfs.write(b"journal.desc", b"%d\n%s\n" % (len(self), desc))
         bookmarksvfs = bookmarks.bookmarksvfs(self)
         bookmarksvfs.write(
             b"journal.bookmarks", bookmarksvfs.tryread(b"bookmarks")
         )
         self.svfs.write(b"journal.phaseroots", self.svfs.tryread(b"phaseroots"))
 
     def recover(self):
         with self.lock():
             if self.svfs.exists(b"journal"):
                 self.ui.status(_(b"rolling back interrupted transaction\n"))
                 vfsmap = {
                     b'': self.svfs,
                     b'plain': self.vfs,
                 }
                 transaction.rollback(
                     self.svfs,
                     vfsmap,
                     b"journal",
                     self.ui.warn,
                     checkambigfiles=_cachedfiles,
                 )
                 self.invalidate()
                 return True
             else:
                 self.ui.warn(_(b"no interrupted transaction available\n"))
                 return False
 
     def rollback(self, dryrun=False, force=False):
         wlock = lock = dsguard = None
         try:
             wlock = self.wlock()
             lock = self.lock()
             if self.svfs.exists(b"undo"):
                 dsguard = dirstateguard.dirstateguard(self, b'rollback')
 
                 return self._rollback(dryrun, force, dsguard)
             else:
                 self.ui.warn(_(b"no rollback information available\n"))
                 return 1
         finally:
             release(dsguard, lock, wlock)
 
     @unfilteredmethod  # Until we get smarter cache management
     def _rollback(self, dryrun, force, dsguard):
         ui = self.ui
         try:
             args = self.vfs.read(b'undo.desc').splitlines()
             (oldlen, desc, detail) = (int(args[0]), args[1], None)
             if len(args) >= 3:
                 detail = args[2]
             oldtip = oldlen - 1
 
             if detail and ui.verbose:
                 msg = _(
                     b'repository tip rolled back to revision %d'
                     b' (undo %s: %s)\n'
                 ) % (oldtip, desc, detail)
             else:
                 msg = _(
                     b'repository tip rolled back to revision %d (undo %s)\n'
                 ) % (oldtip, desc)
         except IOError:
             msg = _(b'rolling back unknown transaction\n')
             desc = None
 
         if not force and self[b'.'] != self[b'tip'] and desc == b'commit':
             raise error.Abort(
                 _(
                     b'rollback of last commit while not checked out '
                     b'may lose data'
                 ),
                 hint=_(b'use -f to force'),
             )
 
         ui.status(msg)
         if dryrun:
             return 0
 
         parents = self.dirstate.parents()
         self.destroying()
         vfsmap = {b'plain': self.vfs, b'': self.svfs}
         transaction.rollback(
             self.svfs, vfsmap, b'undo', ui.warn, checkambigfiles=_cachedfiles
         )
         bookmarksvfs = bookmarks.bookmarksvfs(self)
         if bookmarksvfs.exists(b'undo.bookmarks'):
             bookmarksvfs.rename(
                 b'undo.bookmarks', b'bookmarks', checkambig=True
             )
         if self.svfs.exists(b'undo.phaseroots'):
             self.svfs.rename(b'undo.phaseroots', b'phaseroots', checkambig=True)
         self.invalidate()
 
         has_node = self.changelog.index.has_node
         parentgone = any(not has_node(p) for p in parents)
         if parentgone:
             # prevent dirstateguard from overwriting already restored one
             dsguard.close()
 
             narrowspec.restorebackup(self, b'undo.narrowspec')
             narrowspec.restorewcbackup(self, b'undo.narrowspec.dirstate')
             self.dirstate.restorebackup(None, b'undo.dirstate')
             try:
                 branch = self.vfs.read(b'undo.branch')
                 self.dirstate.setbranch(encoding.tolocal(branch))
             except IOError:
                 ui.warn(
                     _(
                         b'named branch could not be reset: '
                         b'current branch is still \'%s\'\n'
                     )
                     % self.dirstate.branch()
                 )
 
             parents = tuple([p.rev() for p in self[None].parents()])
             if len(parents) > 1:
                 ui.status(
                     _(
                         b'working directory now based on '
                         b'revisions %d and %d\n'
                     )
                     % parents
                 )
             else:
                 ui.status(
                     _(b'working directory now based on revision %d\n') % parents
                 )
             mergemod.mergestate.clean(self, self[b'.'].node())
 
         # TODO: if we know which new heads may result from this rollback, pass
         # them to destroy(), which will prevent the branchhead cache from being
         # invalidated.
         self.destroyed()
         return 0
 
     def _buildcacheupdater(self, newtransaction):
         """called during transaction to build the callback updating cache
 
         Lives on the repository to help extension who might want to augment
         this logic. For this purpose, the created transaction is passed to the
         method.
         """
         # we must avoid cyclic reference between repo and transaction.
         reporef = weakref.ref(self)
 
         def updater(tr):
             repo = reporef()
             repo.updatecaches(tr)
 
         return updater
 
     @unfilteredmethod
     def updatecaches(self, tr=None, full=False):
         """warm appropriate caches
 
         If this function is called after a transaction closed. The transaction
         will be available in the 'tr' argument. This can be used to selectively
         update caches relevant to the changes in that transaction.
 
         If 'full' is set, make sure all caches the function knows about have
         up-to-date data. Even the ones usually loaded more lazily.
         """
         if tr is not None and tr.hookargs.get(b'source') == b'strip':
             # During strip, many caches are invalid but
             # later call to `destroyed` will refresh them.
             return
 
         if tr is None or tr.changes[b'origrepolen'] < len(self):
             # accessing the 'ser ved' branchmap should refresh all the others,
             self.ui.debug(b'updating the branch cache\n')
             self.filtered(b'served').branchmap()
             self.filtered(b'served.hidden').branchmap()
 
         if full:
             unfi = self.unfiltered()
 
             self.changelog.update_caches(transaction=tr)
 
             rbc = unfi.revbranchcache()
             for r in unfi.changelog:
                 rbc.branchinfo(r)
             rbc.write()
 
             # ensure the working copy parents are in the manifestfulltextcache
             for ctx in self[b'.'].parents():
                 ctx.manifest()  # accessing the manifest is enough
 
             # accessing fnode cache warms the cache
             tagsmod.fnoderevs(self.ui, unfi, unfi.changelog.revs())
             # accessing tags warm the cache
             self.tags()
             self.filtered(b'served').tags()
 
             # The `full` arg is documented as updating even the lazily-loaded
             # caches immediately, so we're forcing a write to cause these caches
             # to be warmed up even if they haven't explicitly been requested
             # yet (if they've never been used by hg, they won't ever have been
             # written, even if they're a subset of another kind of cache that
             # *has* been used).
             for filt in repoview.filtertable.keys():
                 filtered = self.filtered(filt)
                 filtered.branchmap().write(filtered)
 
     def invalidatecaches(self):
 
         if '_tagscache' in vars(self):
             # can't use delattr on proxy
             del self.__dict__['_tagscache']
 
         self._branchcaches.clear()
         self.invalidatevolatilesets()
         self._sparsesignaturecache.clear()
 
     def invalidatevolatilesets(self):
         self.filteredrevcache.clear()
         obsolete.clearobscaches(self)
         self._quick_access_changeid_invalidate()
 
     def invalidatedirstate(self):
         '''Invalidates the dirstate, causing the next call to dirstate
         to check if it was modified since the last time it was read,
         rereading it if it has.
 
         This is different to dirstate.invalidate() that it doesn't always
         rereads the dirstate. Use dirstate.invalidate() if you want to
         explicitly read the dirstate again (i.e. restoring it to a previous
         known good state).'''
         if hasunfilteredcache(self, 'dirstate'):
             for k in self.dirstate._filecache:
                 try:
                     delattr(self.dirstate, k)
                 except AttributeError:
                     pass
             delattr(self.unfiltered(), 'dirstate')
 
     def invalidate(self, clearfilecache=False):
         '''Invalidates both store and non-store parts other than dirstate
 
         If a transaction is running, invalidation of store is omitted,
         because discarding in-memory changes might cause inconsistency
         (e.g. incomplete fncache causes unintentional failure, but
         redundant one doesn't).
         '''
         unfiltered = self.unfiltered()  # all file caches are stored unfiltered
         for k in list(self._filecache.keys()):
             # dirstate is invalidated separately in invalidatedirstate()
             if k == b'dirstate':
                 continue
             if (
                 k == b'changelog'
                 and self.currenttransaction()
                 and self.changelog._delayed
             ):
                 # The changelog object may store unwritten revisions. We don't
                 # want to lose them.
                 # TODO: Solve the problem instead of working around it.
                 continue
 
             if clearfilecache:
                 del self._filecache[k]
             try:
                 delattr(unfiltered, k)
             except AttributeError:
                 pass
         self.invalidatecaches()
         if not self.currenttransaction():
             # TODO: Changing contents of store outside transaction
             # causes inconsistency. We should make in-memory store
             # changes detectable, and abort if changed.
             self.store.invalidatecaches()
 
     def invalidateall(self):
         '''Fully invalidates both store and non-store parts, causing the
         subsequent operation to reread any outside changes.'''
         # extension should hook this to invalidate its caches
         self.invalidate()
         self.invalidatedirstate()
 
     @unfilteredmethod
     def _refreshfilecachestats(self, tr):
         """Reload stats of cached files so that they are flagged as valid"""
         for k, ce in self._filecache.items():
             k = pycompat.sysstr(k)
             if k == 'dirstate' or k not in self.__dict__:
                 continue
             ce.refresh()
 
     def _lock(
         self,
         vfs,
         lockname,
         wait,
         releasefn,
         acquirefn,
         desc,
         inheritchecker=None,
         parentenvvar=None,
     ):
         parentlock = None
         # the contents of parentenvvar are used by the underlying lock to
         # determine whether it can be inherited
         if parentenvvar is not None:
             parentlock = encoding.environ.get(parentenvvar)
 
         timeout = 0
         warntimeout = 0
         if wait:
             timeout = self.ui.configint(b"ui", b"timeout")
             warntimeout = self.ui.configint(b"ui", b"timeout.warn")
         # internal config: ui.signal-safe-lock
         signalsafe = self.ui.configbool(b'ui', b'signal-safe-lock')
 
         l = lockmod.trylock(
             self.ui,
             vfs,
             lockname,
             timeout,
             warntimeout,
             releasefn=releasefn,
             acquirefn=acquirefn,
             desc=desc,
             inheritchecker=inheritchecker,
             parentlock=parentlock,
             signalsafe=signalsafe,
         )
         return l
 
     def _afterlock(self, callback):
         """add a callback to be run when the repository is fully unlocked
 
         The callback will be executed when the outermost lock is released
         (with wlock being higher level than 'lock')."""
         for ref in (self._wlockref, self._lockref):
             l = ref and ref()
             if l and l.held:
                 l.postrelease.append(callback)
                 break
         else:  # no lock have been found.
             callback(True)
 
     def lock(self, wait=True):
         '''Lock the repository store (.hg/store) and return a weak reference
         to the lock. Use this before modifying the store (e.g. committing or
         stripping). If you are opening a transaction, get a lock as well.)
 
         If both 'lock' and 'wlock' must be acquired, ensure you always acquires
         'wlock' first to avoid a dead-lock hazard.'''
         l = self._currentlock(self._lockref)
         if l is not None:
             l.lock()
             return l
 
         l = self._lock(
             vfs=self.svfs,
             lockname=b"lock",
             wait=wait,
             releasefn=None,
             acquirefn=self.invalidate,
             desc=_(b'repository %s') % self.origroot,
         )
         self._lockref = weakref.ref(l)
         return l
 
     def _wlockchecktransaction(self):
         if self.currenttransaction() is not None:
             raise error.LockInheritanceContractViolation(
                 b'wlock cannot be inherited in the middle of a transaction'
             )
 
     def wlock(self, wait=True):
         '''Lock the non-store parts of the repository (everything under
         .hg except .hg/store) and return a weak reference to the lock.
 
         Use this before modifying files in .hg.
 
         If both 'lock' and 'wlock' must be acquired, ensure you always acquires
         'wlock' first to avoid a dead-lock hazard.'''
         l = self._wlockref and self._wlockref()
         if l is not None and l.held:
             l.lock()
             return l
 
         # We do not need to check for non-waiting lock acquisition.  Such
         # acquisition would not cause dead-lock as they would just fail.
         if wait and (
             self.ui.configbool(b'devel', b'all-warnings')
             or self.ui.configbool(b'devel', b'check-locks')
         ):
             if self._currentlock(self._lockref) is not None:
                 self.ui.develwarn(b'"wlock" acquired after "lock"')
 
         def unlock():
             if self.dirstate.pendingparentchange():
                 self.dirstate.invalidate()
             else:
                 self.dirstate.write(None)
 
             self._filecache[b'dirstate'].refresh()
 
         l = self._lock(
             self.vfs,
             b"wlock",
             wait,
             unlock,
             self.invalidatedirstate,
             _(b'working directory of %s') % self.origroot,
             inheritchecker=self._wlockchecktransaction,
             parentenvvar=b'HG_WLOCK_LOCKER',
         )
         self._wlockref = weakref.ref(l)
         return l
 
     def _currentlock(self, lockref):
         """Returns the lock if it's held, or None if it's not."""
         if lockref is None:
             return None
         l = lockref()
         if l is None or not l.held:
             return None
         return l
 
     def currentwlock(self):
         """Returns the wlock if it's held, or None if it's not."""
         return self._currentlock(self._wlockref)
 
     def _filecommit(
         self,
         fctx,
         manifest1,
         manifest2,
         linkrev,
         tr,
         changelist,
         includecopymeta,
     ):
         """
         commit an individual file as part of a larger transaction
         """
 
         fname = fctx.path()
         fparent1 = manifest1.get(fname, nullid)
         fparent2 = manifest2.get(fname, nullid)
         if isinstance(fctx, context.filectx):
             node = fctx.filenode()
             if node in [fparent1, fparent2]:
                 self.ui.debug(b'reusing %s filelog entry\n' % fname)
                 if (
                     fparent1 != nullid
                     and manifest1.flags(fname) != fctx.flags()
                 ) or (
                     fparent2 != nullid
                     and manifest2.flags(fname) != fctx.flags()
                 ):
                     changelist.append(fname)
                 return node
 
         flog = self.file(fname)
         meta = {}
         cfname = fctx.copysource()
         if cfname and cfname != fname:
             # Mark the new revision of this file as a copy of another
             # file.  This copy data will effectively act as a parent
             # of this new revision.  If this is a merge, the first
             # parent will be the nullid (meaning "look up the copy data")
             # and the second one will be the other parent.  For example:
             #
             # 0 --- 1 --- 3   rev1 changes file foo
             #   \       /     rev2 renames foo to bar and changes it
             #    \- 2 -/      rev3 should have bar with all changes and
             #                      should record that bar descends from
             #                      bar in rev2 and foo in rev1
             #
             # this allows this merge to succeed:
             #
             # 0 --- 1 --- 3   rev4 reverts the content change from rev2
             #   \       /     merging rev3 and rev4 should use bar@rev2
             #    \- 2 --- 4        as the merge base
             #
 
             cnode = manifest1.get(cfname)
             newfparent = fparent2
 
             if manifest2:  # branch merge
                 if fparent2 == nullid or cnode is None:  # copied on remote side
                     if cfname in manifest2:
                         cnode = manifest2[cfname]
                         newfparent = fparent1
 
             # Here, we used to search backwards through history to try to find
             # where the file copy came from if the source of a copy was not in
             # the parent directory. However, this doesn't actually make sense to
             # do (what does a copy from something not in your working copy even
             # mean?) and it causes bugs (eg, issue4476). Instead, we will warn
             # the user that copy information was dropped, so if they didn't
             # expect this outcome it can be fixed, but this is the correct
             # behavior in this circumstance.
 
             if cnode:
                 self.ui.debug(
                     b" %s: copy %s:%s\n" % (fname, cfname, hex(cnode))
                 )
                 if includecopymeta:
                     meta[b"copy"] = cfname
                     meta[b"copyrev"] = hex(cnode)
                 fparent1, fparent2 = nullid, newfparent
             else:
                 self.ui.warn(
                     _(
                         b"warning: can't find ancestor for '%s' "
                         b"copied from '%s'!\n"
                     )
                     % (fname, cfname)
                 )
 
         elif fparent1 == nullid:
             fparent1, fparent2 = fparent2, nullid
         elif fparent2 != nullid:
             # is one parent an ancestor of the other?
             fparentancestors = flog.commonancestorsheads(fparent1, fparent2)
             if fparent1 in fparentancestors:
                 fparent1, fparent2 = fparent2, nullid
             elif fparent2 in fparentancestors:
                 fparent2 = nullid
+            elif not fparentancestors:
+                # TODO: this whole if-else might be simplified much more
+                ms = mergemod.mergestate.read(self)
+                if (
+                    fname in ms
+                    and ms[fname] == mergemod.MERGE_RECORD_MERGED_OTHER
+                ):
+                    fparent1, fparent2 = fparent2, nullid
 
         # is the file changed?
         text = fctx.data()
         if fparent2 != nullid or flog.cmp(fparent1, text) or meta:
             changelist.append(fname)
             return flog.add(text, meta, tr, linkrev, fparent1, fparent2)
         # are just the flags changed during merge?
         elif fname in manifest1 and manifest1.flags(fname) != fctx.flags():
             changelist.append(fname)
 
         return fparent1
 
     def checkcommitpatterns(self, wctx, match, status, fail):
         """check for commit arguments that aren't committable"""
         if match.isexact() or match.prefix():
             matched = set(status.modified + status.added + status.removed)
 
             for f in match.files():
                 f = self.dirstate.normalize(f)
                 if f == b'.' or f in matched or f in wctx.substate:
                     continue
                 if f in status.deleted:
                     fail(f, _(b'file not found!'))
                 # Is it a directory that exists or used to exist?
                 if self.wvfs.isdir(f) or wctx.p1().hasdir(f):
                     d = f + b'/'
                     for mf in matched:
                         if mf.startswith(d):
                             break
                     else:
                         fail(f, _(b"no match under directory!"))
                 elif f not in self.dirstate:
                     fail(f, _(b"file not tracked!"))
 
     @unfilteredmethod
     def commit(
         self,
         text=b"",
         user=None,
         date=None,
         match=None,
         force=False,
         editor=None,
         extra=None,
     ):
         """Add a new revision to current repository.
 
         Revision information is gathered from the working directory,
         match can be used to filter the committed files. If editor is
         supplied, it is called to get a commit message.
         """
         if extra is None:
             extra = {}
 
         def fail(f, msg):
             raise error.Abort(b'%s: %s' % (f, msg))
 
         if not match:
             match = matchmod.always()
 
         if not force:
             match.bad = fail
 
         # lock() for recent changelog (see issue4368)
         with self.wlock(), self.lock():
             wctx = self[None]
             merge = len(wctx.parents()) > 1
 
             if not force and merge and not match.always():
                 raise error.Abort(
                     _(
                         b'cannot partially commit a merge '
                         b'(do not specify files or patterns)'
                     )
                 )
 
             status = self.status(match=match, clean=force)
             if force:
                 status.modified.extend(
                     status.clean
                 )  # mq may commit clean files
 
             # check subrepos
             subs, commitsubs, newstate = subrepoutil.precommit(
                 self.ui, wctx, status, match, force=force
             )
 
             # make sure all explicit patterns are matched
             if not force:
                 self.checkcommitpatterns(wctx, match, status, fail)
 
             cctx = context.workingcommitctx(
                 self, status, text, user, date, extra
             )
 
             ms = mergemod.mergestate.read(self)
             mergeutil.checkunresolved(ms)
 
             # internal config: ui.allowemptycommit
             allowemptycommit = (
                 wctx.branch() != wctx.p1().branch()
                 or extra.get(b'close')
                 or merge
                 or cctx.files()
                 or self.ui.configbool(b'ui', b'allowemptycommit')
             )
             if not allowemptycommit:
                 self.ui.debug(b'nothing to commit, clearing merge state\n')
                 ms.reset()
                 return None
 
             if merge and cctx.deleted():
                 raise error.Abort(_(b"cannot commit merge with missing files"))
 
             if editor:
                 cctx._text = editor(self, cctx, subs)
             edited = text != cctx._text
 
             # Save commit message in case this transaction gets rolled back
             # (e.g. by a pretxncommit hook).  Leave the content alone on
             # the assumption that the user will use the same editor again.
             msgfn = self.savecommitmessage(cctx._text)
 
             # commit subs and write new state
             if subs:
                 uipathfn = scmutil.getuipathfn(self)
                 for s in sorted(commitsubs):
                     sub = wctx.sub(s)
                     self.ui.status(
                         _(b'committing subrepository %s\n')
                         % uipathfn(subrepoutil.subrelpath(sub))
                     )
                     sr = sub.commit(cctx._text, user, date)
                     newstate[s] = (newstate[s][0], sr)
                 subrepoutil.writestate(self, newstate)
 
             p1, p2 = self.dirstate.parents()
             hookp1, hookp2 = hex(p1), (p2 != nullid and hex(p2) or b'')
             try:
                 self.hook(
                     b"precommit", throw=True, parent1=hookp1, parent2=hookp2
                 )
                 with self.transaction(b'commit'):
                     ret = self.commitctx(cctx, True)
                     # update bookmarks, dirstate and mergestate
                     bookmarks.update(self, [p1, p2], ret)
                     cctx.markcommitted(ret)
                     ms.reset()
             except:  # re-raises
                 if edited:
                     self.ui.write(
                         _(b'note: commit message saved in %s\n') % msgfn
                     )
                 raise
 
         def commithook(unused_success):
             # hack for command that use a temporary commit (eg: histedit)
             # temporary commit got stripped before hook release
             if self.changelog.hasnode(ret):
                 self.hook(
                     b"commit", node=hex(ret), parent1=hookp1, parent2=hookp2
                 )
 
         self._afterlock(commithook)
         return ret
 
     @unfilteredmethod
     def commitctx(self, ctx, error=False, origctx=None):
         """Add a new revision to current repository.
         Revision information is passed via the context argument.
 
         ctx.files() should list all files involved in this commit, i.e.
         modified/added/removed files. On merge, it may be wider than the
         ctx.files() to be committed, since any file nodes derived directly
         from p1 or p2 are excluded from the committed ctx.files().
 
         origctx is for convert to work around the problem that bug
         fixes to the files list in changesets change hashes. For
         convert to be the identity, it can pass an origctx and this
         function will use the same files list when it makes sense to
         do so.
         """
 
         p1, p2 = ctx.p1(), ctx.p2()
         user = ctx.user()
 
         if self.filecopiesmode == b'changeset-sidedata':
             writechangesetcopy = True
             writefilecopymeta = True
             writecopiesto = None
         else:
             writecopiesto = self.ui.config(b'experimental', b'copies.write-to')
             writefilecopymeta = writecopiesto != b'changeset-only'
             writechangesetcopy = writecopiesto in (
                 b'changeset-only',
                 b'compatibility',
             )
         p1copies, p2copies = None, None
         if writechangesetcopy:
             p1copies = ctx.p1copies()
             p2copies = ctx.p2copies()
         filesadded, filesremoved = None, None
         with self.lock(), self.transaction(b"commit") as tr:
             trp = weakref.proxy(tr)
 
             if ctx.manifestnode():
                 # reuse an existing manifest revision
                 self.ui.debug(b'reusing known manifest\n')
                 mn = ctx.manifestnode()
                 files = ctx.files()
                 if writechangesetcopy:
                     filesadded = ctx.filesadded()
                     filesremoved = ctx.filesremoved()
             elif ctx.files():
                 m1ctx = p1.manifestctx()
                 m2ctx = p2.manifestctx()
                 mctx = m1ctx.copy()
 
                 m = mctx.read()
                 m1 = m1ctx.read()
                 m2 = m2ctx.read()
 
                 # check in files
                 added = []
                 changed = []
                 removed = list(ctx.removed())
                 linkrev = len(self)
                 self.ui.note(_(b"committing files:\n"))
                 uipathfn = scmutil.getuipathfn(self)
                 for f in sorted(ctx.modified() + ctx.added()):
                     self.ui.note(uipathfn(f) + b"\n")
                     try:
                         fctx = ctx[f]
                         if fctx is None:
                             removed.append(f)
                         else:
                             added.append(f)
                             m[f] = self._filecommit(
                                 fctx,
                                 m1,
                                 m2,
                                 linkrev,
                                 trp,
                                 changed,
                                 writefilecopymeta,
                             )
                             m.setflag(f, fctx.flags())
                     except OSError:
                         self.ui.warn(
                             _(b"trouble committing %s!\n") % uipathfn(f)
                         )
                         raise
                     except IOError as inst:
                         errcode = getattr(inst, 'errno', errno.ENOENT)
                         if error or errcode and errcode != errno.ENOENT:
                             self.ui.warn(
                                 _(b"trouble committing %s!\n") % uipathfn(f)
                             )
                         raise
 
                 # update manifest
                 removed = [f for f in removed if f in m1 or f in m2]
                 drop = sorted([f for f in removed if f in m])
                 for f in drop:
                     del m[f]
                 if p2.rev() != nullrev:
 
                     @util.cachefunc
                     def mas():
                         p1n = p1.node()
                         p2n = p2.node()
                         cahs = self.changelog.commonancestorsheads(p1n, p2n)
                         if not cahs:
                             cahs = [nullrev]
                         return [self[r].manifest() for r in cahs]
 
                     def deletionfromparent(f):
                         # When a file is removed relative to p1 in a merge, this
                         # function determines whether the absence is due to a
                         # deletion from a parent, or whether the merge commit
                         # itself deletes the file. We decide this by doing a
                         # simplified three way merge of the manifest entry for
                         # the file. There are two ways we decide the merge
                         # itself didn't delete a file:
                         # - neither parent (nor the merge) contain the file
                         # - exactly one parent contains the file, and that
                         #   parent has the same filelog entry as the merge
                         #   ancestor (or all of them if there two). In other
                         #   words, that parent left the file unchanged while the
                         #   other one deleted it.
                         # One way to think about this is that deleting a file is
                         # similar to emptying it, so the list of changed files
                         # should be similar either way. The computation
                         # described above is not done directly in _filecommit
                         # when creating the list of changed files, however
                         # it does something very similar by comparing filelog
                         # nodes.
                         if f in m1:
                             return f not in m2 and all(
                                 f in ma and ma.find(f) == m1.find(f)
                                 for ma in mas()
                             )
                         elif f in m2:
                             return all(
                                 f in ma and ma.find(f) == m2.find(f)
                                 for ma in mas()
                             )
                         else:
                             return True
 
                     removed = [f for f in removed if not deletionfromparent(f)]
 
                 files = changed + removed
                 md = None
                 if not files:
                     # if no "files" actually changed in terms of the changelog,
                     # try hard to detect unmodified manifest entry so that the
                     # exact same commit can be reproduced later on convert.
                     md = m1.diff(m, scmutil.matchfiles(self, ctx.files()))
                 if not files and md:
                     self.ui.debug(
                         b'not reusing manifest (no file change in '
                         b'changelog, but manifest differs)\n'
                     )
                 if files or md:
                     self.ui.note(_(b"committing manifest\n"))
                     # we're using narrowmatch here since it's already applied at
                     # other stages (such as dirstate.walk), so we're already
                     # ignoring things outside of narrowspec in most cases. The
                     # one case where we might have files outside the narrowspec
                     # at this point is merges, and we already error out in the
                     # case where the merge has files outside of the narrowspec,
                     # so this is safe.
                     mn = mctx.write(
                         trp,
                         linkrev,
                         p1.manifestnode(),
                         p2.manifestnode(),
                         added,
                         drop,
                         match=self.narrowmatch(),
                     )
 
                     if writechangesetcopy:
                         filesadded = [
                             f for f in changed if not (f in m1 or f in m2)
                         ]
                         filesremoved = removed
                 else:
                     self.ui.debug(
                         b'reusing manifest from p1 (listed files '
                         b'actually unchanged)\n'
                     )
                     mn = p1.manifestnode()
             else:
                 self.ui.debug(b'reusing manifest from p1 (no file change)\n')
                 mn = p1.manifestnode()
                 files = []
 
             if writecopiesto == b'changeset-only':
                 # If writing only to changeset extras, use None to indicate that
                 # no entry should be written. If writing to both, write an empty
                 # entry to prevent the reader from falling back to reading
                 # filelogs.
                 p1copies = p1copies or None
                 p2copies = p2copies or None
                 filesadded = filesadded or None
                 filesremoved = filesremoved or None
 
             if origctx and origctx.manifestnode() == mn:
                 files = origctx.files()
 
             # update changelog
             self.ui.note(_(b"committing changelog\n"))
             self.changelog.delayupdate(tr)
             n = self.changelog.add(
                 mn,
                 files,
                 ctx.description(),
                 trp,
                 p1.node(),
                 p2.node(),
                 user,
                 ctx.date(),
                 ctx.extra().copy(),
                 p1copies,
                 p2copies,
                 filesadded,
                 filesremoved,
             )
             xp1, xp2 = p1.hex(), p2 and p2.hex() or b''
             self.hook(
                 b'pretxncommit',
                 throw=True,
                 node=hex(n),
                 parent1=xp1,
                 parent2=xp2,
             )
             # set the new commit is proper phase
             targetphase = subrepoutil.newcommitphase(self.ui, ctx)
             if targetphase:
                 # retract boundary do not alter parent changeset.
                 # if a parent have higher the resulting phase will
                 # be compliant anyway
                 #
                 # if minimal phase was 0 we don't need to retract anything
                 phases.registernew(self, tr, targetphase, [n])
             return n
 
     @unfilteredmethod
     def destroying(self):
         '''Inform the repository that nodes are about to be destroyed.
         Intended for use by strip and rollback, so there's a common
         place for anything that has to be done before destroying history.
 
         This is mostly useful for saving state that is in memory and waiting
         to be flushed when the current lock is released. Because a call to
         destroyed is imminent, the repo will be invalidated causing those
         changes to stay in memory (waiting for the next unlock), or vanish
         completely.
         '''
         # When using the same lock to commit and strip, the phasecache is left
         # dirty after committing. Then when we strip, the repo is invalidated,
         # causing those changes to disappear.
         if '_phasecache' in vars(self):
             self._phasecache.write()
 
     @unfilteredmethod
     def destroyed(self):
         '''Inform the repository that nodes have been destroyed.
         Intended for use by strip and rollback, so there's a common
         place for anything that has to be done after destroying history.
         '''
         # When one tries to:
         # 1) destroy nodes thus calling this method (e.g. strip)
         # 2) use phasecache somewhere (e.g. commit)
         #
         # then 2) will fail because the phasecache contains nodes that were
         # removed. We can either remove phasecache from the filecache,
         # causing it to reload next time it is accessed, or simply filter
         # the removed nodes now and write the updated cache.
         self._phasecache.filterunknown(self)
         self._phasecache.write()
 
         # refresh all repository caches
         self.updatecaches()
 
         # Ensure the persistent tag cache is updated.  Doing it now
         # means that the tag cache only has to worry about destroyed
         # heads immediately after a strip/rollback.  That in turn
         # guarantees that "cachetip == currenttip" (comparing both rev
         # and node) always means no nodes have been added or destroyed.
 
         # XXX this is suboptimal when qrefresh'ing: we strip the current
         # head, refresh the tag cache, then immediately add a new head.
         # But I think doing it this way is necessary for the "instant
         # tag cache retrieval" case to work.
         self.invalidate()
 
     def status(
         self,
         node1=b'.',
         node2=None,
         match=None,
         ignored=False,
         clean=False,
         unknown=False,
         listsubrepos=False,
     ):
         '''a convenience method that calls node1.status(node2)'''
         return self[node1].status(
             node2, match, ignored, clean, unknown, listsubrepos
         )
 
     def addpostdsstatus(self, ps):
         """Add a callback to run within the wlock, at the point at which status
         fixups happen.
 
         On status completion, callback(wctx, status) will be called with the
         wlock held, unless the dirstate has changed from underneath or the wlock
         couldn't be grabbed.
 
         Callbacks should not capture and use a cached copy of the dirstate --
         it might change in the meanwhile. Instead, they should access the
         dirstate via wctx.repo().dirstate.
 
         This list is emptied out after each status run -- extensions should
         make sure it adds to this list each time dirstate.status is called.
         Extensions should also make sure they don't call this for statuses
         that don't involve the dirstate.
         """
 
         # The list is located here for uniqueness reasons -- it is actually
         # managed by the workingctx, but that isn't unique per-repo.
         self._postdsstatus.append(ps)
 
     def postdsstatus(self):
         """Used by workingctx to get the list of post-dirstate-status hooks."""
         return self._postdsstatus
 
     def clearpostdsstatus(self):
         """Used by workingctx to clear post-dirstate-status hooks."""
         del self._postdsstatus[:]
 
     def heads(self, start=None):
         if start is None:
             cl = self.changelog
             headrevs = reversed(cl.headrevs())
             return [cl.node(rev) for rev in headrevs]
 
         heads = self.changelog.heads(start)
         # sort the output in rev descending order
         return sorted(heads, key=self.changelog.rev, reverse=True)
 
     def branchheads(self, branch=None, start=None, closed=False):
         '''return a (possibly filtered) list of heads for the given branch
 
         Heads are returned in topological order, from newest to oldest.
         If branch is None, use the dirstate branch.
         If start is not None, return only heads reachable from start.
         If closed is True, return heads that are marked as closed as well.
         '''
         if branch is None:
             branch = self[None].branch()
         branches = self.branchmap()
         if not branches.hasbranch(branch):
             return []
         # the cache returns heads ordered lowest to highest
         bheads = list(reversed(branches.branchheads(branch, closed=closed)))
         if start is not None:
             # filter out the heads that cannot be reached from startrev
             fbheads = set(self.changelog.nodesbetween([start], bheads)[2])
             bheads = [h for h in bheads if h in fbheads]
         return bheads
 
     def branches(self, nodes):
         if not nodes:
             nodes = [self.changelog.tip()]
         b = []
         for n in nodes:
             t = n
             while True:
                 p = self.changelog.parents(n)
                 if p[1] != nullid or p[0] == nullid:
                     b.append((t, n, p[0], p[1]))
                     break
                 n = p[0]
         return b
 
     def between(self, pairs):
         r = []
 
         for top, bottom in pairs:
             n, l, i = top, [], 0
             f = 1
 
             while n != bottom and n != nullid:
                 p = self.changelog.parents(n)[0]
                 if i == f:
                     l.append(n)
                     f = f * 2
                 n = p
                 i += 1
 
             r.append(l)
 
         return r
 
     def checkpush(self, pushop):
         """Extensions can override this function if additional checks have
         to be performed before pushing, or call it if they override push
         command.
         """
 
     @unfilteredpropertycache
     def prepushoutgoinghooks(self):
         """Return util.hooks consists of a pushop with repo, remote, outgoing
         methods, which are called before pushing changesets.
         """
         return util.hooks()
 
     def pushkey(self, namespace, key, old, new):
         try:
             tr = self.currenttransaction()
             hookargs = {}
             if tr is not None:
                 hookargs.update(tr.hookargs)
             hookargs = pycompat.strkwargs(hookargs)
             hookargs['namespace'] = namespace
             hookargs['key'] = key
             hookargs['old'] = old
             hookargs['new'] = new
             self.hook(b'prepushkey', throw=True, **hookargs)
         except error.HookAbort as exc:
             self.ui.write_err(_(b"pushkey-abort: %s\n") % exc)
             if exc.hint:
                 self.ui.write_err(_(b"(%s)\n") % exc.hint)
             return False
         self.ui.debug(b'pushing key for "%s:%s"\n' % (namespace, key))
         ret = pushkey.push(self, namespace, key, old, new)
 
         def runhook(unused_success):
             self.hook(
                 b'pushkey',
                 namespace=namespace,
                 key=key,
                 old=old,
                 new=new,
                 ret=ret,
             )
 
         self._afterlock(runhook)
         return ret
 
     def listkeys(self, namespace):
         self.hook(b'prelistkeys', throw=True, namespace=namespace)
         self.ui.debug(b'listing keys for "%s"\n' % namespace)
         values = pushkey.list(self, namespace)
         self.hook(b'listkeys', namespace=namespace, values=values)
         return values
 
     def debugwireargs(self, one, two, three=None, four=None, five=None):
         '''used to test argument passing over the wire'''
         return b"%s %s %s %s %s" % (
             one,
             two,
             pycompat.bytestr(three),
             pycompat.bytestr(four),
             pycompat.bytestr(five),
         )
 
     def savecommitmessage(self, text):
         fp = self.vfs(b'last-message.txt', b'wb')
         try:
             fp.write(text)
         finally:
             fp.close()
         return self.pathto(fp.name[len(self.root) + 1 :])
 
 
 # used to avoid circular references so destructors work
 def aftertrans(files):
     renamefiles = [tuple(t) for t in files]
 
     def a():
         for vfs, src, dest in renamefiles:
             # if src and dest refer to a same file, vfs.rename is a no-op,
             # leaving both src and dest on disk. delete dest to make sure
             # the rename couldn't be such a no-op.
             vfs.tryunlink(dest)
             try:
                 vfs.rename(src, dest)
             except OSError:  # journal file does not yet exist
                 pass
 
     return a
 
 
 def undoname(fn):
     base, name = os.path.split(fn)
     assert name.startswith(b'journal')
     return os.path.join(base, name.replace(b'journal', b'undo', 1))
 
 
 def instance(ui, path, create, intents=None, createopts=None):
     localpath = util.urllocalpath(path)
     if create:
         createrepository(ui, localpath, createopts=createopts)
 
     return makelocalrepository(ui, localpath, intents=intents)
 
 
 def islocal(path):
     return True
 
 
 def defaultcreateopts(ui, createopts=None):
     """Populate the default creation options for a repository.
 
     A dictionary of explicitly requested creation options can be passed
     in. Missing keys will be populated.
     """
     createopts = dict(createopts or {})
 
     if b'backend' not in createopts:
         # experimental config: storage.new-repo-backend
         createopts[b'backend'] = ui.config(b'storage', b'new-repo-backend')
 
     return createopts
 
 
 def newreporequirements(ui, createopts):
     """Determine the set of requirements for a new local repository.
 
     Extensions can wrap this function to specify custom requirements for
     new repositories.
     """
     # If the repo is being created from a shared repository, we copy
     # its requirements.
     if b'sharedrepo' in createopts:
         requirements = set(createopts[b'sharedrepo'].requirements)
         if createopts.get(b'sharedrelative'):
             requirements.add(b'relshared')
         else:
             requirements.add(b'shared')
 
         return requirements
 
     if b'backend' not in createopts:
         raise error.ProgrammingError(
             b'backend key not present in createopts; '
             b'was defaultcreateopts() called?'
         )
 
     if createopts[b'backend'] != b'revlogv1':
         raise error.Abort(
             _(
                 b'unable to determine repository requirements for '
                 b'storage backend: %s'
             )
             % createopts[b'backend']
         )
 
     requirements = {b'revlogv1'}
     if ui.configbool(b'format', b'usestore'):
         requirements.add(b'store')
         if ui.configbool(b'format', b'usefncache'):
             requirements.add(b'fncache')
             if ui.configbool(b'format', b'dotencode'):
                 requirements.add(b'dotencode')
 
     compengines = ui.configlist(b'format', b'revlog-compression')
     for compengine in compengines:
         if compengine in util.compengines:
             break
     else:
         raise error.Abort(
             _(
                 b'compression engines %s defined by '
                 b'format.revlog-compression not available'
             )
             % b', '.join(b'"%s"' % e for e in compengines),
             hint=_(
                 b'run "hg debuginstall" to list available '
                 b'compression engines'
             ),
         )
 
     # zlib is the historical default and doesn't need an explicit requirement.
     if compengine == b'zstd':
         requirements.add(b'revlog-compression-zstd')
     elif compengine != b'zlib':
         requirements.add(b'exp-compression-%s' % compengine)
 
     if scmutil.gdinitconfig(ui):
         requirements.add(b'generaldelta')
         if ui.configbool(b'format', b'sparse-revlog'):
             requirements.add(SPARSEREVLOG_REQUIREMENT)
 
     # experimental config: format.exp-use-side-data
     if ui.configbool(b'format', b'exp-use-side-data'):
         requirements.add(SIDEDATA_REQUIREMENT)
     # experimental config: format.exp-use-copies-side-data-changeset
     if ui.configbool(b'format', b'exp-use-copies-side-data-changeset'):
         requirements.add(SIDEDATA_REQUIREMENT)
         requirements.add(COPIESSDC_REQUIREMENT)
     if ui.configbool(b'experimental', b'treemanifest'):
         requirements.add(b'treemanifest')
 
     revlogv2 = ui.config(b'experimental', b'revlogv2')
     if revlogv2 == b'enable-unstable-format-and-corrupt-my-data':
         requirements.remove(b'revlogv1')
         # generaldelta is implied by revlogv2.
         requirements.discard(b'generaldelta')
         requirements.add(REVLOGV2_REQUIREMENT)
     # experimental config: format.internal-phase
     if ui.configbool(b'format', b'internal-phase'):
         requirements.add(b'internal-phase')
 
     if createopts.get(b'narrowfiles'):
         requirements.add(repository.NARROW_REQUIREMENT)
 
     if createopts.get(b'lfs'):
         requirements.add(b'lfs')
 
     if ui.configbool(b'format', b'bookmarks-in-store'):
         requirements.add(bookmarks.BOOKMARKS_IN_STORE_REQUIREMENT)
 
     return requirements
 
 
 def filterknowncreateopts(ui, createopts):
     """Filters a dict of repo creation options against options that are known.
 
     Receives a dict of repo creation options and returns a dict of those
     options that we don't know how to handle.
 
     This function is called as part of repository creation. If the
     returned dict contains any items, repository creation will not
     be allowed, as it means there was a request to create a repository
     with options not recognized by loaded code.
 
     Extensions can wrap this function to filter out creation options
     they know how to handle.
     """
     known = {
         b'backend',
         b'lfs',
         b'narrowfiles',
         b'sharedrepo',
         b'sharedrelative',
         b'shareditems',
         b'shallowfilestore',
     }
 
     return {k: v for k, v in createopts.items() if k not in known}
 
 
 def createrepository(ui, path, createopts=None):
     """Create a new repository in a vfs.
 
     ``path`` path to the new repo's working directory.
     ``createopts`` options for the new repository.
 
     The following keys for ``createopts`` are recognized:
 
     backend
        The storage backend to use.
     lfs
        Repository will be created with ``lfs`` requirement. The lfs extension
        will automatically be loaded when the repository is accessed.
     narrowfiles
        Set up repository to support narrow file storage.
     sharedrepo
        Repository object from which storage should be shared.
     sharedrelative
        Boolean indicating if the path to the shared repo should be
        stored as relative. By default, the pointer to the "parent" repo
        is stored as an absolute path.
     shareditems
        Set of items to share to the new repository (in addition to storage).
     shallowfilestore
        Indicates that storage for files should be shallow (not all ancestor
        revisions are known).
     """
     createopts = defaultcreateopts(ui, createopts=createopts)
 
     unknownopts = filterknowncreateopts(ui, createopts)
 
     if not isinstance(unknownopts, dict):
         raise error.ProgrammingError(
             b'filterknowncreateopts() did not return a dict'
         )
 
     if unknownopts:
         raise error.Abort(
             _(
                 b'unable to create repository because of unknown '
                 b'creation option: %s'
             )
             % b', '.join(sorted(unknownopts)),
             hint=_(b'is a required extension not loaded?'),
         )
 
     requirements = newreporequirements(ui, createopts=createopts)
 
     wdirvfs = vfsmod.vfs(path, expandpath=True, realpath=True)
 
     hgvfs = vfsmod.vfs(wdirvfs.join(b'.hg'))
     if hgvfs.exists():
         raise error.RepoError(_(b'repository %s already exists') % path)
 
     if b'sharedrepo' in createopts:
         sharedpath = createopts[b'sharedrepo'].sharedpath
 
         if createopts.get(b'sharedrelative'):
             try:
                 sharedpath = os.path.relpath(sharedpath, hgvfs.base)
             except (IOError, ValueError) as e:
                 # ValueError is raised on Windows if the drive letters differ
                 # on each path.
                 raise error.Abort(
                     _(b'cannot calculate relative path'),
                     hint=stringutil.forcebytestr(e),
                 )
 
     if not wdirvfs.exists():
         wdirvfs.makedirs()
 
     hgvfs.makedir(notindexed=True)
     if b'sharedrepo' not in createopts:
         hgvfs.mkdir(b'cache')
     hgvfs.mkdir(b'wcache')
 
     if b'store' in requirements and b'sharedrepo' not in createopts:
         hgvfs.mkdir(b'store')
 
         # We create an invalid changelog outside the store so very old
         # Mercurial versions (which didn't know about the requirements
         # file) encounter an error on reading the changelog. This
         # effectively locks out old clients and prevents them from
         # mucking with a repo in an unknown format.
         #
         # The revlog header has version 2, which won't be recognized by
         # such old clients.
         hgvfs.append(
             b'00changelog.i',
             b'\0\0\0\2 dummy changelog to prevent using the old repo '
             b'layout',
         )
 
     scmutil.writerequires(hgvfs, requirements)
 
     # Write out file telling readers where to find the shared store.
     if b'sharedrepo' in createopts:
         hgvfs.write(b'sharedpath', sharedpath)
 
     if createopts.get(b'shareditems'):
         shared = b'\n'.join(sorted(createopts[b'shareditems'])) + b'\n'
         hgvfs.write(b'shared', shared)
 
 
 def poisonrepository(repo):
     """Poison a repository instance so it can no longer be used."""
     # Perform any cleanup on the instance.
     repo.close()
 
     # Our strategy is to replace the type of the object with one that
     # has all attribute lookups result in error.
     #
     # But we have to allow the close() method because some constructors
     # of repos call close() on repo references.
     class poisonedrepository(object):
         def __getattribute__(self, item):
             if item == 'close':
                 return object.__getattribute__(self, item)
 
             raise error.ProgrammingError(
                 b'repo instances should not be used after unshare'
             )
 
         def close(self):
             pass
 
     # We may have a repoview, which intercepts __setattr__. So be sure
     # we operate at the lowest level possible.
     object.__setattr__(repo, '__class__', poisonedrepository)