convert: change hg.saverev default to False

This needlessly breaks changeset identifiers for the common case (cleaning
history), which is sad.

hgext/convert/__init__.py

@@ -1,233 +1,233 b''
 # convert.py Foreign SCM converter
 #
 # Copyright 2005-2007 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 '''converting foreign VCS repositories to Mercurial'''
 
 import convcmd
 import cvsps
 from mercurial import commands
 from mercurial.i18n import _
 
 # Commands definition was moved elsewhere to ease demandload job.
 
 def convert(ui, src, dest=None, revmapfile=None, **opts):
     """convert a foreign SCM repository to a Mercurial one.
 
     Accepted source formats [identifiers]:
     - Mercurial [hg]
     - CVS [cvs]
     - Darcs [darcs]
     - git [git]
     - Subversion [svn]
     - Monotone [mtn]
     - GNU Arch [gnuarch]
     - Bazaar [bzr]
 
     Accepted destination formats [identifiers]:
     - Mercurial [hg]
     - Subversion [svn] (history on branches is not preserved)
 
     If no revision is given, all revisions will be converted. Otherwise,
     convert will only import up to the named revision (given in a format
     understood by the source).
 
     If no destination directory name is specified, it defaults to the
     basename of the source with '-hg' appended.  If the destination
     repository doesn't exist, it will be created.
 
     If <REVMAP> isn't given, it will be put in a default location
     (<dest>/.hg/shamap by default).  The <REVMAP> is a simple text
     file that maps each source commit ID to the destination ID for
     that revision, like so:
     <source ID> <destination ID>
 
     If the file doesn't exist, it's automatically created.  It's updated
     on each commit copied, so convert-repo can be interrupted and can
     be run repeatedly to copy new commits.
 
     The [username mapping] file is a simple text file that maps each source
     commit author to a destination commit author. It is handy for source SCMs
     that use unix logins to identify authors (eg: CVS). One line per author
     mapping and the line format is:
     srcauthor=whatever string you want
 
     The filemap is a file that allows filtering and remapping of files
     and directories.  Comment lines start with '#'.  Each line can
     contain one of the following directives:
 
       include path/to/file
 
       exclude path/to/file
 
       rename from/file to/file
 
     The 'include' directive causes a file, or all files under a
     directory, to be included in the destination repository, and the
     exclusion of all other files and dirs not explicitely included.
     The 'exclude' directive causes files or directories to be omitted.
     The 'rename' directive renames a file or directory.  To rename from a
     subdirectory into the root of the repository, use '.' as the path to
     rename to.
 
     The splicemap is a file that allows insertion of synthetic
     history, letting you specify the parents of a revision.  This is
     useful if you want to e.g. give a Subversion merge two parents, or
     graft two disconnected series of history together.  Each entry
     contains a key, followed by a space, followed by one or two
     values, separated by spaces.  The key is the revision ID in the
     source revision control system whose parents should be modified
     (same format as a key in .hg/shamap).  The values are the revision
     IDs (in either the source or destination revision control system)
     that should be used as the new parents for that node.
 
     Mercurial Source
     -----------------
 
     --config convert.hg.ignoreerrors=False (boolean)
         ignore integrity errors when reading. Use it to fix Mercurial
         repositories with missing revlogs, by converting from and to
         Mercurial.
-    --config convert.hg.saverev=True          (boolean)
-        allow target to preserve source revision ID
+    --config convert.hg.saverev=False          (boolean)
+        store original revision ID in changeset (forces target IDs to change)
     --config convert.hg.startrev=0            (hg revision identifier)
         convert start revision and its descendants
 
     CVS Source
     ----------
 
     CVS source will use a sandbox (i.e. a checked-out copy) from CVS
     to indicate the starting point of what will be converted. Direct
     access to the repository files is not needed, unless of course
     the repository is :local:. The conversion uses the top level
     directory in the sandbox to find the CVS repository, and then uses
     CVS rlog commands to find files to convert. This means that unless
     a filemap is given, all files under the starting directory will be
     converted, and that any directory reorganisation in the CVS
     sandbox is ignored.
 
     Because CVS does not have changesets, it is necessary to collect
     individual commits to CVS and merge them into changesets. CVS
     source uses its internal changeset merging code by default but can
     be configured to call the external 'cvsps' program by setting:
         --config convert.cvsps='cvsps -A -u --cvs-direct -q'
     This is a legacy option and may be removed in future.
 
     The options shown are the defaults.
 
     Internal cvsps is selected by setting
         --config convert.cvsps=builtin
     and has a few more configurable options:
         --config convert.cvsps.fuzz=60   (integer)
             Specify the maximum time (in seconds) that is allowed between
             commits with identical user and log message in a single
             changeset. When very large files were checked in as part
             of a changeset then the default may not be long enough.
         --config convert.cvsps.mergeto='{{mergetobranch ([-\w]+)}}'
             Specify a regular expression to which commit log messages are
             matched. If a match occurs, then the conversion process will
             insert a dummy revision merging the branch on which this log
             message occurs to the branch indicated in the regex.
         --config convert.cvsps.mergefrom='{{mergefrombranch ([-\w]+)}}'
             Specify a regular expression to which commit log messages are
             matched. If a match occurs, then the conversion process will
             add the most recent revision on the branch indicated in the
             regex as the second parent of the changeset.
 
     The hgext/convert/cvsps wrapper script allows the builtin changeset
     merging code to be run without doing a conversion. Its parameters and
     output are similar to that of cvsps 2.1.
 
     Subversion Source
     -----------------
 
     Subversion source detects classical trunk/branches/tags layouts.
     By default, the supplied "svn://repo/path/" source URL is
     converted as a single branch. If "svn://repo/path/trunk" exists
     it replaces the default branch. If "svn://repo/path/branches"
     exists, its subdirectories are listed as possible branches. If
     "svn://repo/path/tags" exists, it is looked for tags referencing
     converted branches. Default "trunk", "branches" and "tags" values
     can be overriden with following options. Set them to paths
     relative to the source URL, or leave them blank to disable
     autodetection.
 
     --config convert.svn.branches=branches    (directory name)
         specify the directory containing branches
     --config convert.svn.tags=tags            (directory name)
         specify the directory containing tags
     --config convert.svn.trunk=trunk          (directory name)
         specify the name of the trunk branch
 
     Source history can be retrieved starting at a specific revision,
     instead of being integrally converted. Only single branch
     conversions are supported.
 
     --config convert.svn.startrev=0           (svn revision number)
         specify start Subversion revision.
 
     Mercurial Destination
     ---------------------
 
     --config convert.hg.clonebranches=False   (boolean)
         dispatch source branches in separate clones.
     --config convert.hg.tagsbranch=default    (branch name)
         tag revisions branch name
     --config convert.hg.usebranchnames=True   (boolean)
         preserve branch names
 
     """
     return convcmd.convert(ui, src, dest, revmapfile, **opts)
 
 def debugsvnlog(ui, **opts):
     return convcmd.debugsvnlog(ui, **opts)
 
 def debugcvsps(ui, *args, **opts):
     '''create changeset information from CVS
 
     This command is intended as a debugging tool for the CVS to Mercurial
     converter, and can be used as a direct replacement for cvsps.
 
     Hg debugcvsps reads the CVS rlog for current directory (or any named
     directory) in the CVS repository, and converts the log to a series of
     changesets based on matching commit log entries and dates.'''
     return cvsps.debugcvsps(ui, *args, **opts)
 
 commands.norepo += " convert debugsvnlog debugcvsps"
 
 cmdtable = {
     "convert":
         (convert,
          [('A', 'authors', '', _('username mapping filename')),
           ('d', 'dest-type', '', _('destination repository type')),
           ('', 'filemap', '', _('remap file names using contents of file')),
           ('r', 'rev', '', _('import up to target revision REV')),
           ('s', 'source-type', '', _('source repository type')),
           ('', 'splicemap', '', _('splice synthesized history into place')),
           ('', 'datesort', None, _('try to sort changesets by date'))],
          _('hg convert [OPTION]... SOURCE [DEST [REVMAP]]')),
     "debugsvnlog":
         (debugsvnlog,
          [],
          'hg debugsvnlog'),
     "debugcvsps":
         (debugcvsps,
          [
           # Main options shared with cvsps-2.1
           ('b', 'branches', [], _('only return changes on specified branches')),
           ('p', 'prefix', '', _('prefix to remove from file names')),
           ('r', 'revisions', [], _('only return changes after or between specified tags')),
           ('u', 'update-cache', None, _("update cvs log cache")),
           ('x', 'new-cache', None, _("create new cvs log cache")),
           ('z', 'fuzz', 60, _('set commit time fuzz in seconds')),
           ('', 'root', '', _('specify cvsroot')),
           # Options specific to builtin cvsps
           ('', 'parents', '', _('show parent changesets')),
           ('', 'ancestors', '', _('show current changeset in ancestor branches')),
           # Options that are ignored for compatibility with cvsps-2.1
           ('A', 'cvs-direct', None, _('ignored for compatibility')),
          ],
          _('hg debugcvsps [OPTION]... [PATH]...')),
 }

hgext/convert/hg.py

@@ -1,335 +1,335 b''
 # hg backend for convert extension
 
 # Notes for hg->hg conversion:
 #
 # * Old versions of Mercurial didn't trim the whitespace from the ends
 #   of commit messages, but new versions do.  Changesets created by
 #   those older versions, then converted, may thus have different
 #   hashes for changesets that are otherwise identical.
 #
 # * By default, the source revision is stored in the converted
 #   revision.  This will cause the converted revision to have a
 #   different identity than the source.  To avoid this, use the
 #   following option: "--config convert.hg.saverev=false"
 
 
 import os, time
 from mercurial.i18n import _
 from mercurial.node import bin, hex, nullid
 from mercurial import hg, util, context, error
 
 from common import NoRepo, commit, converter_source, converter_sink
 
 class mercurial_sink(converter_sink):
     def __init__(self, ui, path):
         converter_sink.__init__(self, ui, path)
         self.branchnames = ui.configbool('convert', 'hg.usebranchnames', True)
         self.clonebranches = ui.configbool('convert', 'hg.clonebranches', False)
         self.tagsbranch = ui.config('convert', 'hg.tagsbranch', 'default')
         self.lastbranch = None
         if os.path.isdir(path) and len(os.listdir(path)) > 0:
             try:
                 self.repo = hg.repository(self.ui, path)
                 if not self.repo.local():
                     raise NoRepo(_('%s is not a local Mercurial repo') % path)
             except error.RepoError, err:
                 ui.print_exc()
                 raise NoRepo(err.args[0])
         else:
             try:
                 ui.status(_('initializing destination %s repository\n') % path)
                 self.repo = hg.repository(self.ui, path, create=True)
                 if not self.repo.local():
                     raise NoRepo(_('%s is not a local Mercurial repo') % path)
                 self.created.append(path)
             except error.RepoError, err:
                 ui.print_exc()
                 raise NoRepo("could not create hg repo %s as sink" % path)
         self.lock = None
         self.wlock = None
         self.filemapmode = False
 
     def before(self):
         self.ui.debug(_('run hg sink pre-conversion action\n'))
         self.wlock = self.repo.wlock()
         self.lock = self.repo.lock()
 
     def after(self):
         self.ui.debug(_('run hg sink post-conversion action\n'))
         self.lock = None
         self.wlock = None
 
     def revmapfile(self):
         return os.path.join(self.path, ".hg", "shamap")
 
     def authorfile(self):
         return os.path.join(self.path, ".hg", "authormap")
 
     def getheads(self):
         h = self.repo.changelog.heads()
         return [ hex(x) for x in h ]
 
     def setbranch(self, branch, pbranches):
         if not self.clonebranches:
             return
 
         setbranch = (branch != self.lastbranch)
         self.lastbranch = branch
         if not branch:
             branch = 'default'
         pbranches = [(b[0], b[1] and b[1] or 'default') for b in pbranches]
         pbranch = pbranches and pbranches[0][1] or 'default'
 
         branchpath = os.path.join(self.path, branch)
         if setbranch:
             self.after()
             try:
                 self.repo = hg.repository(self.ui, branchpath)
             except:
                 self.repo = hg.repository(self.ui, branchpath, create=True)
             self.before()
 
         # pbranches may bring revisions from other branches (merge parents)
         # Make sure we have them, or pull them.
         missings = {}
         for b in pbranches:
             try:
                 self.repo.lookup(b[0])
             except:
                 missings.setdefault(b[1], []).append(b[0])
 
         if missings:
             self.after()
             for pbranch, heads in missings.iteritems():
                 pbranchpath = os.path.join(self.path, pbranch)
                 prepo = hg.repository(self.ui, pbranchpath)
                 self.ui.note(_('pulling from %s into %s\n') % (pbranch, branch))
                 self.repo.pull(prepo, [prepo.lookup(h) for h in heads])
             self.before()
 
     def putcommit(self, files, copies, parents, commit, source):
 
         files = dict(files)
         def getfilectx(repo, memctx, f):
             v = files[f]
             data = source.getfile(f, v)
             e = source.getmode(f, v)
             return context.memfilectx(f, data, 'l' in e, 'x' in e, copies.get(f))
 
         pl = []
         for p in parents:
             if p not in pl:
                 pl.append(p)
         parents = pl
         nparents = len(parents)
         if self.filemapmode and nparents == 1:
             m1node = self.repo.changelog.read(bin(parents[0]))[0]
             parent = parents[0]
 
         if len(parents) < 2: parents.append("0" * 40)
         if len(parents) < 2: parents.append("0" * 40)
         p2 = parents.pop(0)
 
         text = commit.desc
         extra = commit.extra.copy()
         if self.branchnames and commit.branch:
             extra['branch'] = commit.branch
         if commit.rev:
             extra['convert_revision'] = commit.rev
 
         while parents:
             p1 = p2
             p2 = parents.pop(0)
             ctx = context.memctx(self.repo, (p1, p2), text, files.keys(), getfilectx,
                                  commit.author, commit.date, extra)
             a = self.repo.commitctx(ctx)
             text = "(octopus merge fixup)\n"
             p2 = hex(self.repo.changelog.tip())
 
         if self.filemapmode and nparents == 1:
             man = self.repo.manifest
             mnode = self.repo.changelog.read(bin(p2))[0]
             if not man.cmp(m1node, man.revision(mnode)):
                 self.repo.rollback()
                 return parent
         return p2
 
     def puttags(self, tags):
          try:
              parentctx = self.repo[self.tagsbranch]
              tagparent = parentctx.node()
          except error.RepoError, inst:
              parentctx = None
              tagparent = nullid
 
          try:
              oldlines = util.sort(parentctx['.hgtags'].data().splitlines(1))
          except:
              oldlines = []
 
          newlines = util.sort([("%s %s\n" % (tags[tag], tag)) for tag in tags])
 
          if newlines == oldlines:
              return None
          data = "".join(newlines)
 
          def getfilectx(repo, memctx, f):
             return context.memfilectx(f, data, False, False, None)
 
          self.ui.status(_("updating tags\n"))
          date = "%s 0" % int(time.mktime(time.gmtime()))
          extra = {'branch': self.tagsbranch}
          ctx = context.memctx(self.repo, (tagparent, None), "update tags",
                               [".hgtags"], getfilectx, "convert-repo", date,
                               extra)
          self.repo.commitctx(ctx)
          return hex(self.repo.changelog.tip())
 
     def setfilemapmode(self, active):
         self.filemapmode = active
 
 class mercurial_source(converter_source):
     def __init__(self, ui, path, rev=None):
         converter_source.__init__(self, ui, path, rev)
         self.ignoreerrors = ui.configbool('convert', 'hg.ignoreerrors', False)
         self.ignored = {}
-        self.saverev = ui.configbool('convert', 'hg.saverev', True)
+        self.saverev = ui.configbool('convert', 'hg.saverev', False)
         try:
             self.repo = hg.repository(self.ui, path)
             # try to provoke an exception if this isn't really a hg
             # repo, but some other bogus compatible-looking url
             if not self.repo.local():
                 raise error.RepoError()
         except error.RepoError:
             ui.print_exc()
             raise NoRepo("%s is not a local Mercurial repo" % path)
         self.lastrev = None
         self.lastctx = None
         self._changescache = None
         self.convertfp = None
         # Restrict converted revisions to startrev descendants
         startnode = ui.config('convert', 'hg.startrev')
         if startnode is not None:
             try:
                 startnode = self.repo.lookup(startnode)
             except error.RepoError:
                 raise util.Abort(_('%s is not a valid start revision')
                                  % startnode)
             startrev = self.repo.changelog.rev(startnode)
             children = {startnode: 1}
             for rev in self.repo.changelog.descendants(startrev):
                 children[self.repo.changelog.node(rev)] = 1
             self.keep = children.__contains__
         else:
             self.keep = util.always
 
     def changectx(self, rev):
         if self.lastrev != rev:
             self.lastctx = self.repo[rev]
             self.lastrev = rev
         return self.lastctx
 
     def parents(self, ctx):
         return [p.node() for p in ctx.parents()
                 if p and self.keep(p.node())]
 
     def getheads(self):
         if self.rev:
             heads = [self.repo[self.rev].node()]
         else:
             heads = self.repo.heads()
         return [hex(h) for h in heads if self.keep(h)]
 
     def getfile(self, name, rev):
         try:
             return self.changectx(rev)[name].data()
         except error.LookupError, err:
             raise IOError(err)
 
     def getmode(self, name, rev):
         return self.changectx(rev).manifest().flags(name)
 
     def getchanges(self, rev):
         ctx = self.changectx(rev)
         parents = self.parents(ctx)
         if not parents:
             files = util.sort(ctx.manifest().keys())
             if self.ignoreerrors:
                 # calling getcopies() is a simple way to detect missing
                 # revlogs and populate self.ignored
                 self.getcopies(ctx, files)
             return [(f, rev) for f in files if f not in self.ignored], {}
         if self._changescache and self._changescache[0] == rev:
             m, a, r = self._changescache[1]
         else:
             m, a, r = self.repo.status(parents[0], ctx.node())[:3]
         # getcopies() detects missing revlogs early, run it before
         # filtering the changes.
         copies = self.getcopies(ctx, m + a)
         changes = [(name, rev) for name in m + a + r
                    if name not in self.ignored]
         return util.sort(changes), copies
 
     def getcopies(self, ctx, files):
         copies = {}
         for name in files:
             if name in self.ignored:
                 continue
             try:
                 copysource, copynode = ctx.filectx(name).renamed()
                 if copysource in self.ignored or not self.keep(copynode):
                     continue
                 copies[name] = copysource
             except TypeError:
                 pass
             except error.LookupError, e:
                 if not self.ignoreerrors:
                     raise
                 self.ignored[name] = 1
                 self.ui.warn(_('ignoring: %s\n') % e)
         return copies
 
     def getcommit(self, rev):
         ctx = self.changectx(rev)
         parents = [hex(p) for p in self.parents(ctx)]
         if self.saverev:
             crev = rev
         else:
             crev = None
         return commit(author=ctx.user(), date=util.datestr(ctx.date()),
                       desc=ctx.description(), rev=crev, parents=parents,
                       branch=ctx.branch(), extra=ctx.extra())
 
     def gettags(self):
         tags = [t for t in self.repo.tagslist() if t[0] != 'tip']
         return dict([(name, hex(node)) for name, node in tags
                      if self.keep(node)])
 
     def getchangedfiles(self, rev, i):
         ctx = self.changectx(rev)
         parents = self.parents(ctx)
         if not parents and i is None:
             i = 0
             changes = [], ctx.manifest().keys(), []
         else:
             i = i or 0
             changes = self.repo.status(parents[i], ctx.node())[:3]
         changes = [[f for f in l if f not in self.ignored] for l in changes]
 
         if i == 0:
             self._changescache = (rev, changes)
 
         return changes[0] + changes[1] + changes[2]
 
     def converted(self, rev, destrev):
         if self.convertfp is None:
             self.convertfp = open(os.path.join(self.path, '.hg', 'shamap'),
                                   'a')
         self.convertfp.write('%s %s\n' % (destrev, rev))
         self.convertfp.flush()
 
     def before(self):
         self.ui.debug(_('run hg source pre-conversion action\n'))
 
     def after(self):
         self.ui.debug(_('run hg source post-conversion action\n'))

tests/test-convert-hg-startrev.out

@@ -1,88 +1,88 b''
 1 files updated, 0 files merged, 2 files removed, 0 files unresolved
 merging a and e to e
 2 files updated, 1 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 % convert from null revision
 initializing destination empty repository
 scanning source...
 sorting...
 converting...
 % convert from zero revision
 initializing destination full repository
 scanning source...
 sorting...
 converting...
 5 0: add a b
 4 1: add c
 3 2: copy e from a, change b
 2 3: change a
 1 4: merge 2 and 3, copy d from b
 0 5: change a
 o  5 "5: change a" files: a
 |
 o    4 "4: merge 2 and 3, copy d from b" files: d e
 |\
 | o  3 "3: change a" files: a
 | |
 o |  2 "2: copy e from a, change b" files: b e
 | |
 o |  1 "1: add c" files: c
 |/
 o  0 "0: add a b" files: a b
 
 % convert from merge parent
 initializing destination conv1 repository
 scanning source...
 sorting...
 converting...
 3 1: add c
 2 2: copy e from a, change b
 1 4: merge 2 and 3, copy d from b
 0 5: change a
 o  3 "5: change a" files: a
 |
 o  2 "4: merge 2 and 3, copy d from b" files: a d e
 |
 o  1 "2: copy e from a, change b" files: b e
 |
 o  0 "1: add c" files: a b c
 
 % check copy preservation
-changeset:   2:cb71f8e79b45
+changeset:   2:d67b1d48a835
 user:        test
 date:        Thu Jan 01 00:00:04 1970 +0000
 summary:     4: merge 2 and 3, copy d from b
 
-changeset:   1:3334790240a8
+changeset:   1:462c431cf47d
 user:        test
 date:        Thu Jan 01 00:00:02 1970 +0000
 summary:     2: copy e from a, change b
 
 % check copy removal on missing parent
-changeset:   2:cb71f8e79b45
+changeset:   2:d67b1d48a835
 user:        test
 date:        Thu Jan 01 00:00:04 1970 +0000
 summary:     4: merge 2 and 3, copy d from b
 
 a
 a
 a
 b
 b
 % convert from merge
 initializing destination conv4 repository
 scanning source...
 sorting...
 converting...
 1 4: merge 2 and 3, copy d from b
 0 5: change a
 o  1 "5: change a" files: a
 |
 o  0 "4: merge 2 and 3, copy d from b" files: a b c d e
 
 5 files updated, 0 files merged, 0 files removed, 0 files unresolved
 a
 a
 a
 b
 b

tests/test-convert.out

@@ -1,211 +1,211 b''
 hg convert [OPTION]... SOURCE [DEST [REVMAP]]
 
 convert a foreign SCM repository to a Mercurial one.
 
     Accepted source formats [identifiers]:
     - Mercurial [hg]
     - CVS [cvs]
     - Darcs [darcs]
     - git [git]
     - Subversion [svn]
     - Monotone [mtn]
     - GNU Arch [gnuarch]
     - Bazaar [bzr]
 
     Accepted destination formats [identifiers]:
     - Mercurial [hg]
     - Subversion [svn] (history on branches is not preserved)
 
     If no revision is given, all revisions will be converted. Otherwise,
     convert will only import up to the named revision (given in a format
     understood by the source).
 
     If no destination directory name is specified, it defaults to the
     basename of the source with '-hg' appended.  If the destination
     repository doesn't exist, it will be created.
 
     If <REVMAP> isn't given, it will be put in a default location
     (<dest>/.hg/shamap by default).  The <REVMAP> is a simple text
     file that maps each source commit ID to the destination ID for
     that revision, like so:
     <source ID> <destination ID>
 
     If the file doesn't exist, it's automatically created.  It's updated
     on each commit copied, so convert-repo can be interrupted and can
     be run repeatedly to copy new commits.
 
     The [username mapping] file is a simple text file that maps each source
     commit author to a destination commit author. It is handy for source SCMs
     that use unix logins to identify authors (eg: CVS). One line per author
     mapping and the line format is:
     srcauthor=whatever string you want
 
     The filemap is a file that allows filtering and remapping of files
     and directories.  Comment lines start with '#'.  Each line can
     contain one of the following directives:
 
       include path/to/file
 
       exclude path/to/file
 
       rename from/file to/file
 
     The 'include' directive causes a file, or all files under a
     directory, to be included in the destination repository, and the
     exclusion of all other files and dirs not explicitely included.
     The 'exclude' directive causes files or directories to be omitted.
     The 'rename' directive renames a file or directory.  To rename from a
     subdirectory into the root of the repository, use '.' as the path to
     rename to.
 
     The splicemap is a file that allows insertion of synthetic
     history, letting you specify the parents of a revision.  This is
     useful if you want to e.g. give a Subversion merge two parents, or
     graft two disconnected series of history together.  Each entry
     contains a key, followed by a space, followed by one or two
     values, separated by spaces.  The key is the revision ID in the
     source revision control system whose parents should be modified
     (same format as a key in .hg/shamap).  The values are the revision
     IDs (in either the source or destination revision control system)
     that should be used as the new parents for that node.
 
     Mercurial Source
     -----------------
 
     --config convert.hg.ignoreerrors=False (boolean)
         ignore integrity errors when reading. Use it to fix Mercurial
         repositories with missing revlogs, by converting from and to
         Mercurial.
-    --config convert.hg.saverev=True          (boolean)
-        allow target to preserve source revision ID
+    --config convert.hg.saverev=False          (boolean)
+        store original revision ID in changeset (forces target IDs to change)
     --config convert.hg.startrev=0            (hg revision identifier)
         convert start revision and its descendants
 
     CVS Source
     ----------
 
     CVS source will use a sandbox (i.e. a checked-out copy) from CVS
     to indicate the starting point of what will be converted. Direct
     access to the repository files is not needed, unless of course
     the repository is :local:. The conversion uses the top level
     directory in the sandbox to find the CVS repository, and then uses
     CVS rlog commands to find files to convert. This means that unless
     a filemap is given, all files under the starting directory will be
     converted, and that any directory reorganisation in the CVS
     sandbox is ignored.
 
     Because CVS does not have changesets, it is necessary to collect
     individual commits to CVS and merge them into changesets. CVS
     source uses its internal changeset merging code by default but can
     be configured to call the external 'cvsps' program by setting:
         --config convert.cvsps='cvsps -A -u --cvs-direct -q'
     This is a legacy option and may be removed in future.
 
     The options shown are the defaults.
 
     Internal cvsps is selected by setting
         --config convert.cvsps=builtin
     and has a few more configurable options:
         --config convert.cvsps.fuzz=60   (integer)
             Specify the maximum time (in seconds) that is allowed between
             commits with identical user and log message in a single
             changeset. When very large files were checked in as part
             of a changeset then the default may not be long enough.
         --config convert.cvsps.mergeto='{{mergetobranch ([-\w]+)}}'
             Specify a regular expression to which commit log messages are
             matched. If a match occurs, then the conversion process will
             insert a dummy revision merging the branch on which this log
             message occurs to the branch indicated in the regex.
         --config convert.cvsps.mergefrom='{{mergefrombranch ([-\w]+)}}'
             Specify a regular expression to which commit log messages are
             matched. If a match occurs, then the conversion process will
             add the most recent revision on the branch indicated in the
             regex as the second parent of the changeset.
 
     The hgext/convert/cvsps wrapper script allows the builtin changeset
     merging code to be run without doing a conversion. Its parameters and
     output are similar to that of cvsps 2.1.
 
     Subversion Source
     -----------------
 
     Subversion source detects classical trunk/branches/tags layouts.
     By default, the supplied "svn://repo/path/" source URL is
     converted as a single branch. If "svn://repo/path/trunk" exists
     it replaces the default branch. If "svn://repo/path/branches"
     exists, its subdirectories are listed as possible branches. If
     "svn://repo/path/tags" exists, it is looked for tags referencing
     converted branches. Default "trunk", "branches" and "tags" values
     can be overriden with following options. Set them to paths
     relative to the source URL, or leave them blank to disable
     autodetection.
 
     --config convert.svn.branches=branches    (directory name)
         specify the directory containing branches
     --config convert.svn.tags=tags            (directory name)
         specify the directory containing tags
     --config convert.svn.trunk=trunk          (directory name)
         specify the name of the trunk branch
 
     Source history can be retrieved starting at a specific revision,
     instead of being integrally converted. Only single branch
     conversions are supported.
 
     --config convert.svn.startrev=0           (svn revision number)
         specify start Subversion revision.
 
     Mercurial Destination
     ---------------------
 
     --config convert.hg.clonebranches=False   (boolean)
         dispatch source branches in separate clones.
     --config convert.hg.tagsbranch=default    (branch name)
         tag revisions branch name
     --config convert.hg.usebranchnames=True   (boolean)
         preserve branch names
 
 options:
 
  -A --authors      username mapping filename
  -d --dest-type    destination repository type
     --filemap      remap file names using contents of file
  -r --rev          import up to target revision REV
  -s --source-type  source repository type
     --splicemap    splice synthesized history into place
     --datesort     try to sort changesets by date
 
 use "hg -v help convert" to show global options
 adding a
 assuming destination a-hg
 initializing destination a-hg repository
 scanning source...
 sorting...
 converting...
 4 a
 3 b
 2 c
 1 d
 0 e
 pulling from ../a
 searching for changes
 no changes found
 % should fail
 initializing destination bogusfile repository
 abort: cannot create new bundle repository
 % should fail
 abort: Permission denied: bogusdir
 % should succeed
 initializing destination bogusdir repository
 scanning source...
 sorting...
 converting...
 4 a
 3 b
 2 c
 1 d
 0 e
 % test pre and post conversion actions
 run hg source pre-conversion action
 run hg sink pre-conversion action
 run hg sink post-conversion action
 run hg source post-conversion action