exthelper: reintroduce the ability to register filesets

Same mechanism as revsets earlier in this series.  The LFS extension is updated
to provide test coverage.

hgext/lfs/__init__.py

@@ -1,381 +1,380 b''
 # lfs - hash-preserving large file support using Git-LFS protocol
 #
 # Copyright 2017 Facebook, Inc.
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 """lfs - large file support (EXPERIMENTAL)
 
 This extension allows large files to be tracked outside of the normal
 repository storage and stored on a centralized server, similar to the
 ``largefiles`` extension.  The ``git-lfs`` protocol is used when
 communicating with the server, so existing git infrastructure can be
 harnessed.  Even though the files are stored outside of the repository,
 they are still integrity checked in the same manner as normal files.
 
 The files stored outside of the repository are downloaded on demand,
 which reduces the time to clone, and possibly the local disk usage.
 This changes fundamental workflows in a DVCS, so careful thought
 should be given before deploying it.  :hg:`convert` can be used to
 convert LFS repositories to normal repositories that no longer
 require this extension, and do so without changing the commit hashes.
 This allows the extension to be disabled if the centralized workflow
 becomes burdensome.  However, the pre and post convert clones will
 not be able to communicate with each other unless the extension is
 enabled on both.
 
 To start a new repository, or to add LFS files to an existing one, just
 create an ``.hglfs`` file as described below in the root directory of
 the repository.  Typically, this file should be put under version
 control, so that the settings will propagate to other repositories with
 push and pull.  During any commit, Mercurial will consult this file to
 determine if an added or modified file should be stored externally.  The
 type of storage depends on the characteristics of the file at each
 commit.  A file that is near a size threshold may switch back and forth
 between LFS and normal storage, as needed.
 
 Alternately, both normal repositories and largefile controlled
 repositories can be converted to LFS by using :hg:`convert` and the
 ``lfs.track`` config option described below.  The ``.hglfs`` file
 should then be created and added, to control subsequent LFS selection.
 The hashes are also unchanged in this case.  The LFS and non-LFS
 repositories can be distinguished because the LFS repository will
 abort any command if this extension is disabled.
 
 Committed LFS files are held locally, until the repository is pushed.
 Prior to pushing the normal repository data, the LFS files that are
 tracked by the outgoing commits are automatically uploaded to the
 configured central server.  No LFS files are transferred on
 :hg:`pull` or :hg:`clone`.  Instead, the files are downloaded on
 demand as they need to be read, if a cached copy cannot be found
 locally.  Both committing and downloading an LFS file will link the
 file to a usercache, to speed up future access.  See the `usercache`
 config setting described below.
 
 .hglfs::
 
     The extension reads its configuration from a versioned ``.hglfs``
     configuration file found in the root of the working directory. The
     ``.hglfs`` file uses the same syntax as all other Mercurial
     configuration files. It uses a single section, ``[track]``.
 
     The ``[track]`` section specifies which files are stored as LFS (or
     not). Each line is keyed by a file pattern, with a predicate value.
     The first file pattern match is used, so put more specific patterns
     first.  The available predicates are ``all()``, ``none()``, and
     ``size()``. See "hg help filesets.size" for the latter.
 
     Example versioned ``.hglfs`` file::
 
       [track]
       # No Makefile or python file, anywhere, will be LFS
       **Makefile = none()
       **.py = none()
 
       **.zip = all()
       **.exe = size(">1MB")
 
       # Catchall for everything not matched above
       ** = size(">10MB")
 
 Configs::
 
     [lfs]
     # Remote endpoint. Multiple protocols are supported:
     # - http(s)://user:[e-mail]/path
     #   git-lfs endpoint
     # - file:///tmp/path
     #   local filesystem, usually for testing
     # if unset, lfs will assume the remote repository also handles blob storage
     # for http(s) URLs.  Otherwise, lfs will prompt to set this when it must
     # use this value.
     # (default: unset)
     url = https://example.com/repo.git/info/lfs
 
     # Which files to track in LFS.  Path tests are "**.extname" for file
     # extensions, and "path:under/some/directory" for path prefix.  Both
     # are relative to the repository root.
     # File size can be tested with the "size()" fileset, and tests can be
     # joined with fileset operators.  (See "hg help filesets.operators".)
     #
     # Some examples:
     # - all()                       # everything
     # - none()                      # nothing
     # - size(">20MB")               # larger than 20MB
     # - !**.txt                     # anything not a *.txt file
     # - **.zip | **.tar.gz | **.7z  # some types of compressed files
     # - path:bin                    # files under "bin" in the project root
     # - (**.php & size(">2MB")) | (**.js & size(">5MB")) | **.tar.gz
     #     | (path:bin & !path:/bin/README) | size(">1GB")
     # (default: none())
     #
     # This is ignored if there is a tracked '.hglfs' file, and this setting
     # will eventually be deprecated and removed.
     track = size(">10M")
 
     # how many times to retry before giving up on transferring an object
     retry = 5
 
     # the local directory to store lfs files for sharing across local clones.
     # If not set, the cache is located in an OS specific cache location.
     usercache = /path/to/global/cache
 """
 
 from __future__ import absolute_import
 
 import sys
 
 from mercurial.i18n import _
 
 from mercurial import (
     config,
     error,
     exchange,
     extensions,
     exthelper,
     filelog,
     filesetlang,
     localrepo,
     minifileset,
     node,
     pycompat,
-    registrar,
     repository,
     revlog,
     scmutil,
     templateutil,
     util,
 )
 
 from . import (
     blobstore,
     wireprotolfsserver,
     wrapper,
 )
 
 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
 testedwith = 'ships-with-hg-core'
 
 eh = exthelper.exthelper()
 eh.merge(wrapper.eh)
 eh.merge(wireprotolfsserver.eh)
 
 cmdtable = eh.cmdtable
 configtable = eh.configtable
 extsetup = eh.finalextsetup
 uisetup = eh.finaluisetup
+filesetpredicate = eh.filesetpredicate
 reposetup = eh.finalreposetup
 templatekeyword = eh.templatekeyword
 
 eh.configitem('experimental', 'lfs.serve',
     default=True,
 )
 eh.configitem('experimental', 'lfs.user-agent',
     default=None,
 )
 eh.configitem('experimental', 'lfs.disableusercache',
     default=False,
 )
 eh.configitem('experimental', 'lfs.worker-enable',
     default=False,
 )
 
 eh.configitem('lfs', 'url',
     default=None,
 )
 eh.configitem('lfs', 'usercache',
     default=None,
 )
 # Deprecated
 eh.configitem('lfs', 'threshold',
     default=None,
 )
 eh.configitem('lfs', 'track',
     default='none()',
 )
 eh.configitem('lfs', 'retry',
     default=5,
 )
-filesetpredicate = registrar.filesetpredicate()
 
 lfsprocessor = (
     wrapper.readfromstore,
     wrapper.writetostore,
     wrapper.bypasscheckhash,
 )
 
 def featuresetup(ui, supported):
     # don't die on seeing a repo with the lfs requirement
     supported |= {'lfs'}
 
 @eh.uisetup
 def _uisetup(ui):
     localrepo.featuresetupfuncs.add(featuresetup)
 
 @eh.reposetup
 def _reposetup(ui, repo):
     # Nothing to do with a remote repo
     if not repo.local():
         return
 
     repo.svfs.lfslocalblobstore = blobstore.local(repo)
     repo.svfs.lfsremoteblobstore = blobstore.remote(repo)
 
     class lfsrepo(repo.__class__):
         @localrepo.unfilteredmethod
         def commitctx(self, ctx, error=False):
             repo.svfs.options['lfstrack'] = _trackedmatcher(self)
             return super(lfsrepo, self).commitctx(ctx, error)
 
     repo.__class__ = lfsrepo
 
     if 'lfs' not in repo.requirements:
         def checkrequireslfs(ui, repo, **kwargs):
             if 'lfs' in repo.requirements:
                 return 0
 
             last = kwargs.get(r'node_last')
             _bin = node.bin
             if last:
                 s = repo.set('%n:%n', _bin(kwargs[r'node']), _bin(last))
             else:
                 s = repo.set('%n', _bin(kwargs[r'node']))
             match = repo.narrowmatch()
             for ctx in s:
                 # TODO: is there a way to just walk the files in the commit?
                 if any(ctx[f].islfs() for f in ctx.files()
                        if f in ctx and match(f)):
                     repo.requirements.add('lfs')
                     repo.features.add(repository.REPO_FEATURE_LFS)
                     repo._writerequirements()
                     repo.prepushoutgoinghooks.add('lfs', wrapper.prepush)
                     break
 
         ui.setconfig('hooks', 'commit.lfs', checkrequireslfs, 'lfs')
         ui.setconfig('hooks', 'pretxnchangegroup.lfs', checkrequireslfs, 'lfs')
     else:
         repo.prepushoutgoinghooks.add('lfs', wrapper.prepush)
 
 def _trackedmatcher(repo):
     """Return a function (path, size) -> bool indicating whether or not to
     track a given file with lfs."""
     if not repo.wvfs.exists('.hglfs'):
         # No '.hglfs' in wdir.  Fallback to config for now.
         trackspec = repo.ui.config('lfs', 'track')
 
         # deprecated config: lfs.threshold
         threshold = repo.ui.configbytes('lfs', 'threshold')
         if threshold:
             filesetlang.parse(trackspec)  # make sure syntax errors are confined
             trackspec = "(%s) | size('>%d')" % (trackspec, threshold)
 
         return minifileset.compile(trackspec)
 
     data = repo.wvfs.tryread('.hglfs')
     if not data:
         return lambda p, s: False
 
     # Parse errors here will abort with a message that points to the .hglfs file
     # and line number.
     cfg = config.config()
     cfg.parse('.hglfs', data)
 
     try:
         rules = [(minifileset.compile(pattern), minifileset.compile(rule))
                  for pattern, rule in cfg.items('track')]
     except error.ParseError as e:
         # The original exception gives no indicator that the error is in the
         # .hglfs file, so add that.
 
         # TODO: See if the line number of the file can be made available.
         raise error.Abort(_('parse error in .hglfs: %s') % e)
 
     def _match(path, size):
         for pat, rule in rules:
             if pat(path, size):
                 return rule(path, size)
 
         return False
 
     return _match
 
 # Called by remotefilelog
 def wrapfilelog(filelog):
     wrapfunction = extensions.wrapfunction
 
     wrapfunction(filelog, 'addrevision', wrapper.filelogaddrevision)
     wrapfunction(filelog, 'renamed', wrapper.filelogrenamed)
     wrapfunction(filelog, 'size', wrapper.filelogsize)
 
 @eh.wrapfunction(localrepo, 'resolverevlogstorevfsoptions')
 def _resolverevlogstorevfsoptions(orig, ui, requirements, features):
     opts = orig(ui, requirements, features)
     for name, module in extensions.extensions(ui):
         if module is sys.modules[__name__]:
             if revlog.REVIDX_EXTSTORED in opts[b'flagprocessors']:
                 msg = (_(b"cannot register multiple processors on flag '%#x'.")
                        % revlog.REVIDX_EXTSTORED)
                 raise error.Abort(msg)
 
             opts[b'flagprocessors'][revlog.REVIDX_EXTSTORED] = lfsprocessor
             break
 
     return opts
 
 @eh.extsetup
 def _extsetup(ui):
     wrapfilelog(filelog.filelog)
 
     scmutil.fileprefetchhooks.add('lfs', wrapper._prefetchfiles)
 
     # Make bundle choose changegroup3 instead of changegroup2. This affects
     # "hg bundle" command. Note: it does not cover all bundle formats like
     # "packed1". Using "packed1" with lfs will likely cause trouble.
     exchange._bundlespeccontentopts["v2"]["cg.version"] = "03"
 
-@filesetpredicate('lfs()')
[e-mail]('lfs()')
 def lfsfileset(mctx, x):
     """File that uses LFS storage."""
     # i18n: "lfs" is a keyword
     filesetlang.getargs(x, 0, 0, _("lfs takes no arguments"))
     ctx = mctx.ctx
     def lfsfilep(f):
         return wrapper.pointerfromctx(ctx, f, removed=True) is not None
     return mctx.predicate(lfsfilep, predrepr='<lfs>')
 
 @eh.templatekeyword('lfs_files', requires={'ctx'})
 def lfsfiles(context, mapping):
     """List of strings. All files modified, added, or removed by this
     changeset."""
     ctx = context.resource(mapping, 'ctx')
 
     pointers = wrapper.pointersfromctx(ctx, removed=True) # {path: pointer}
     files = sorted(pointers.keys())
 
     def pointer(v):
         # In the file spec, version is first and the other keys are sorted.
         sortkeyfunc = lambda x: (x[0] != 'version', x)
         items = sorted(pointers[v].iteritems(), key=sortkeyfunc)
         return util.sortdict(items)
 
     makemap = lambda v: {
         'file': v,
         'lfsoid': pointers[v].oid() if pointers[v] else None,
         'lfspointer': templateutil.hybriddict(pointer(v)),
     }
 
     # TODO: make the separator ', '?
     f = templateutil._showcompatlist(context, mapping, 'lfs_file', files)
     return templateutil.hybrid(f, files, makemap, pycompat.identity)
 
 @eh.command('debuglfsupload',
             [('r', 'rev', [], _('upload large files introduced by REV'))])
 def debuglfsupload(ui, repo, **opts):
     """upload lfs blobs added by the working copy parent or given revisions"""
     revs = opts.get(r'rev', [])
     pointers = wrapper.extractpointers(repo, scmutil.revrange(repo, revs))
     wrapper.uploadblobs(repo, pointers)

mercurial/exthelper.py

@@ -1,281 +1,283 b''
 # Copyright 2012 Logilab SA        <[e-mail]>
 #                Pierre-Yves David <[e-mail]>
 #                Octobus <[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.
 
 #####################################################################
 ### Extension helper                                              ###
 #####################################################################
 
 from __future__ import absolute_import
 
 from . import (
     commands,
     error,
     extensions,
     registrar,
 )
 
 class exthelper(object):
     """Helper for modular extension setup
 
     A single helper should be instantiated for each extension. Helper
     methods are then used as decorators for various purpose.
 
     All decorators return the original function and may be chained.
     """
 
     def __init__(self):
         self._uipopulatecallables = []
         self._uicallables = []
         self._extcallables = []
         self._repocallables = []
         self._commandwrappers = []
         self._extcommandwrappers = []
         self._functionwrappers = []
         self._duckpunchers = []
         self.cmdtable = {}
         self.command = registrar.command(self.cmdtable)
         self.configtable = {}
         self.configitem = registrar.configitem(self.configtable)
+        self.filesetpredicate = registrar.filesetpredicate()
         self.revsetpredicate = registrar.revsetpredicate()
         self.templatekeyword = registrar.templatekeyword()
 
     def merge(self, other):
         self._uicallables.extend(other._uicallables)
         self._uipopulatecallables.extend(other._uipopulatecallables)
         self._extcallables.extend(other._extcallables)
         self._repocallables.extend(other._repocallables)
+        self.filesetpredicate._table.update(other.filesetpredicate._table)
         self.revsetpredicate._table.update(other.revsetpredicate._table)
         self.templatekeyword._table.update(other.templatekeyword._table)
         self._commandwrappers.extend(other._commandwrappers)
         self._extcommandwrappers.extend(other._extcommandwrappers)
         self._functionwrappers.extend(other._functionwrappers)
         self._duckpunchers.extend(other._duckpunchers)
         self.cmdtable.update(other.cmdtable)
         for section, items in other.configtable.iteritems():
             if section in self.configtable:
                 self.configtable[section].update(items)
             else:
                 self.configtable[section] = items
 
     def finaluisetup(self, ui):
         """Method to be used as the extension uisetup
 
         The following operations belong here:
 
         - Changes to ui.__class__ . The ui object that will be used to run the
           command has not yet been created. Changes made here will affect ui
           objects created after this, and in particular the ui that will be
           passed to runcommand
         - Command wraps (extensions.wrapcommand)
         - Changes that need to be visible to other extensions: because
           initialization occurs in phases (all extensions run uisetup, then all
           run extsetup), a change made here will be visible to other extensions
           during extsetup
         - Monkeypatch or wrap function (extensions.wrapfunction) of dispatch
           module members
         - Setup of pre-* and post-* hooks
         - pushkey setup
         """
         for cont, funcname, func in self._duckpunchers:
             setattr(cont, funcname, func)
         for command, wrapper, opts in self._commandwrappers:
             entry = extensions.wrapcommand(commands.table, command, wrapper)
             if opts:
                 for opt in opts:
                     entry[1].append(opt)
         for cont, funcname, wrapper in self._functionwrappers:
             extensions.wrapfunction(cont, funcname, wrapper)
         for c in self._uicallables:
             c(ui)
 
     def finaluipopulate(self, ui):
         """Method to be used as the extension uipopulate
 
         This is called once per ui instance to:
 
         - Set up additional ui members
         - Update configuration by ``ui.setconfig()``
         - Extend the class dynamically
         """
         for c in self._uipopulatecallables:
             c(ui)
 
     def finalextsetup(self, ui):
         """Method to be used as a the extension extsetup
 
         The following operations belong here:
 
         - Changes depending on the status of other extensions. (if
           extensions.find('mq'))
         - Add a global option to all commands
         """
         knownexts = {}
 
         for ext, command, wrapper, opts in self._extcommandwrappers:
             if ext not in knownexts:
                 try:
                     e = extensions.find(ext)
                 except KeyError:
                     # Extension isn't enabled, so don't bother trying to wrap
                     # it.
                     continue
                 knownexts[ext] = e.cmdtable
             entry = extensions.wrapcommand(knownexts[ext], command, wrapper)
             if opts:
                 for opt in opts:
                     entry[1].append(opt)
 
         for c in self._extcallables:
             c(ui)
 
     def finalreposetup(self, ui, repo):
         """Method to be used as the extension reposetup
 
         The following operations belong here:
 
         - All hooks but pre-* and post-*
         - Modify configuration variables
         - Changes to repo.__class__, repo.dirstate.__class__
         """
         for c in self._repocallables:
             c(ui, repo)
 
     def uisetup(self, call):
         """Decorated function will be executed during uisetup
 
         example::
 
             @eh.uisetup
             def setupbabar(ui):
                 print 'this is uisetup!'
         """
         self._uicallables.append(call)
         return call
 
     def uipopulate(self, call):
         """Decorated function will be executed during uipopulate
 
         example::
 
             @eh.uipopulate
             def setupfoo(ui):
                 print 'this is uipopulate!'
         """
         self._uipopulatecallables.append(call)
         return call
 
     def extsetup(self, call):
         """Decorated function will be executed during extsetup
 
         example::
 
             @eh.extsetup
             def setupcelestine(ui):
                 print 'this is extsetup!'
         """
         self._extcallables.append(call)
         return call
 
     def reposetup(self, call):
         """Decorated function will be executed during reposetup
 
         example::
 
             @eh.reposetup
             def setupzephir(ui, repo):
                 print 'this is reposetup!'
         """
         self._repocallables.append(call)
         return call
 
     def wrapcommand(self, command, extension=None, opts=None):
         """Decorated function is a command wrapper
 
         The name of the command must be given as the decorator argument.
         The wrapping is installed during `uisetup`.
 
         If the second option `extension` argument is provided, the wrapping
         will be applied in the extension commandtable. This argument must be a
         string that will be searched using `extension.find` if not found and
         Abort error is raised. If the wrapping applies to an extension, it is
         installed during `extsetup`.
 
         example::
 
             @eh.wrapcommand('summary')
             def wrapsummary(orig, ui, repo, *args, **kwargs):
                 ui.note('Barry!')
                 return orig(ui, repo, *args, **kwargs)
 
         The `opts` argument allows specifying a list of tuples for additional
         arguments for the command.  See ``mercurial.fancyopts.fancyopts()`` for
         the format of the tuple.
 
         """
         if opts is None:
             opts = []
         else:
             for opt in opts:
                 if not isinstance(opt, tuple):
                     raise error.ProgrammingError('opts must be list of tuples')
                 if len(opt) not in (4, 5):
                     msg = 'each opt tuple must contain 4 or 5 values'
                     raise error.ProgrammingError(msg)
 
         def dec(wrapper):
             if extension is None:
                 self._commandwrappers.append((command, wrapper, opts))
             else:
                 self._extcommandwrappers.append((extension, command, wrapper,
                                                  opts))
             return wrapper
         return dec
 
     def wrapfunction(self, container, funcname):
         """Decorated function is a function wrapper
 
         This function takes two arguments, the container and the name of the
         function to wrap. The wrapping is performed during `uisetup`.
         (there is no extension support)
 
         example::
 
             @eh.function(discovery, 'checkheads')
             def wrapfunction(orig, *args, **kwargs):
                 ui.note('His head smashed in and his heart cut out')
                 return orig(*args, **kwargs)
         """
         def dec(wrapper):
             self._functionwrappers.append((container, funcname, wrapper))
             return wrapper
         return dec
 
     def addattr(self, container, funcname):
         """Decorated function is to be added to the container
 
         This function takes two arguments, the container and the name of the
         function to wrap. The wrapping is performed during `uisetup`.
 
         Adding attributes to a container like this is discouraged, because the
         container modification is visible even in repositories that do not
         have the extension loaded.  Therefore, care must be taken that the
         function doesn't make assumptions that the extension was loaded for the
         current repository.  For `ui` and `repo` instances, a better option is
         to subclass the instance in `uipopulate` and `reposetup` respectively.
 
         https://www.mercurial-scm.org/wiki/WritingExtensions
 
         example::
 
             @eh.addattr(context.changectx, 'babar')
             def babar(ctx):
                 return 'babar' in ctx.description
         """
         def dec(func):
             self._duckpunchers.append((container, funcname, func))
             return func
         return dec