rebase: clean up rebasestate from active transaction

Previously, rebase assumes the following pattern:

    rebase:
        with transaction as tr: # top-level
            ...
        tr.__close__ writes rebasestate
        unlink('rebasestate')

However it's possible that "rebase" was called inside a transaction:

    with transaction as tr1:
        rebase:
            with transaction as tr2: # not top-level
                ...
            tr2.__close__ does not write rebasestate
            unlink('rebasestate')
    tr1.__close__ writes rebasestate

That leaves a rebasestate on disk incorrectly.

This patch adds "removefilegenerator" to notify transaction code that the
state file is no longer needed therefore fixes the issue.

hgext/rebase.py

@@ -1,1528 +1,1532
 # rebase.py - rebasing feature for mercurial
 #
 # Copyright 2008 Stefano Tortarolo <stefano.tortarolo at gmail dot com>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 '''command to move sets of revisions to a different ancestor
 
 This extension lets you rebase changesets in an existing Mercurial
 repository.
 
 For more information:
 https://mercurial-scm.org/wiki/RebaseExtension
 '''
 
 from __future__ import absolute_import
 
 import errno
 import os
 
 from mercurial.i18n import _
 from mercurial.node import (
     hex,
     nullid,
     nullrev,
     short,
 )
 from mercurial import (
     bookmarks,
     cmdutil,
     commands,
     copies,
     destutil,
     dirstateguard,
     error,
     extensions,
     hg,
     lock,
     merge as mergemod,
     mergeutil,
     obsolete,
     patch,
     phases,
     registrar,
     repair,
     repoview,
     revset,
     scmutil,
     smartset,
     util,
 )
 
 release = lock.release
 templateopts = cmdutil.templateopts
 
 # The following constants are used throughout the rebase module. The ordering of
 # their values must be maintained.
 
 # Indicates that a revision needs to be rebased
 revtodo = -1
 nullmerge = -2
 revignored = -3
 # successor in rebase destination
 revprecursor = -4
 # plain prune (no successor)
 revpruned = -5
 revskipped = (revignored, revprecursor, revpruned)
 
 cmdtable = {}
 command = registrar.command(cmdtable)
 # 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'
 
 def _nothingtorebase():
     return 1
 
 def _savegraft(ctx, extra):
     s = ctx.extra().get('source', None)
     if s is not None:
         extra['source'] = s
     s = ctx.extra().get('intermediate-source', None)
     if s is not None:
         extra['intermediate-source'] = s
 
 def _savebranch(ctx, extra):
     extra['branch'] = ctx.branch()
 
 def _makeextrafn(copiers):
     """make an extrafn out of the given copy-functions.
 
     A copy function takes a context and an extra dict, and mutates the
     extra dict as needed based on the given context.
     """
     def extrafn(ctx, extra):
         for c in copiers:
             c(ctx, extra)
     return extrafn
 
 def _destrebase(repo, sourceset, destspace=None):
     """small wrapper around destmerge to pass the right extra args
 
     Please wrap destutil.destmerge instead."""
     return destutil.destmerge(repo, action='rebase', sourceset=sourceset,
                               onheadcheck=False, destspace=destspace)
 
 revsetpredicate = registrar.revsetpredicate()
 
 @revsetpredicate('_destrebase')
 def _revsetdestrebase(repo, subset, x):
     # ``_rebasedefaultdest()``
 
     # default destination for rebase.
     # # XXX: Currently private because I expect the signature to change.
     # # XXX: - bailing out in case of ambiguity vs returning all data.
     # i18n: "_rebasedefaultdest" is a keyword
     sourceset = None
     if x is not None:
         sourceset = revset.getset(repo, smartset.fullreposet(repo), x)
     return subset & smartset.baseset([_destrebase(repo, sourceset)])
 
 class rebaseruntime(object):
     """This class is a container for rebase runtime state"""
     def __init__(self, repo, ui, opts=None):
         if opts is None:
             opts = {}
 
         self.repo = repo
         self.ui = ui
         self.opts = opts
         self.originalwd = None
         self.external = nullrev
         # Mapping between the old revision id and either what is the new rebased
         # revision or what needs to be done with the old revision. The state
         # dict will be what contains most of the rebase progress state.
         self.state = {}
         self.activebookmark = None
         self.currentbookmarks = None
         self.dest = None
         self.skipped = set()
         self.destancestors = set()
 
         self.collapsef = opts.get('collapse', False)
         self.collapsemsg = cmdutil.logmessage(ui, opts)
         self.date = opts.get('date', None)
 
         e = opts.get('extrafn') # internal, used by e.g. hgsubversion
         self.extrafns = [_savegraft]
         if e:
             self.extrafns = [e]
 
         self.keepf = opts.get('keep', False)
         self.keepbranchesf = opts.get('keepbranches', False)
         # keepopen is not meant for use on the command line, but by
         # other extensions
         self.keepopen = opts.get('keepopen', False)
         self.obsoletenotrebased = {}
 
     def storestatus(self, tr=None):
         """Store the current status to allow recovery"""
         if tr:
             tr.addfilegenerator('rebasestate', ('rebasestate',),
                                 self._writestatus, location='plain')
         else:
             with self.repo.vfs("rebasestate", "w") as f:
                 self._writestatus(f)
 
     def _writestatus(self, f):
         repo = self.repo.unfiltered()
         f.write(repo[self.originalwd].hex() + '\n')
         f.write(repo[self.dest].hex() + '\n')
         f.write(repo[self.external].hex() + '\n')
         f.write('%d\n' % int(self.collapsef))
         f.write('%d\n' % int(self.keepf))
         f.write('%d\n' % int(self.keepbranchesf))
         f.write('%s\n' % (self.activebookmark or ''))
         for d, v in self.state.iteritems():
             oldrev = repo[d].hex()
             if v >= 0:
                 newrev = repo[v].hex()
             elif v == revtodo:
                 # To maintain format compatibility, we have to use nullid.
                 # Please do remove this special case when upgrading the format.
                 newrev = hex(nullid)
             else:
                 newrev = v
             f.write("%s:%s\n" % (oldrev, newrev))
         repo.ui.debug('rebase status stored\n')
 
     def restorestatus(self):
         """Restore a previously stored status"""
         repo = self.repo
         keepbranches = None
         dest = None
         collapse = False
         external = nullrev
         activebookmark = None
         state = {}
 
         try:
             f = repo.vfs("rebasestate")
             for i, l in enumerate(f.read().splitlines()):
                 if i == 0:
                     originalwd = repo[l].rev()
                 elif i == 1:
                     dest = repo[l].rev()
                 elif i == 2:
                     external = repo[l].rev()
                 elif i == 3:
                     collapse = bool(int(l))
                 elif i == 4:
                     keep = bool(int(l))
                 elif i == 5:
                     keepbranches = bool(int(l))
                 elif i == 6 and not (len(l) == 81 and ':' in l):
                     # line 6 is a recent addition, so for backwards
                     # compatibility check that the line doesn't look like the
                     # oldrev:newrev lines
                     activebookmark = l
                 else:
                     oldrev, newrev = l.split(':')
                     if newrev in (str(nullmerge), str(revignored),
                                   str(revprecursor), str(revpruned)):
                         state[repo[oldrev].rev()] = int(newrev)
                     elif newrev == nullid:
                         state[repo[oldrev].rev()] = revtodo
                         # Legacy compat special case
                     else:
                         state[repo[oldrev].rev()] = repo[newrev].rev()
 
         except IOError as err:
             if err.errno != errno.ENOENT:
                 raise
             cmdutil.wrongtooltocontinue(repo, _('rebase'))
 
         if keepbranches is None:
             raise error.Abort(_('.hg/rebasestate is incomplete'))
 
         skipped = set()
         # recompute the set of skipped revs
         if not collapse:
             seen = {dest}
             for old, new in sorted(state.items()):
                 if new != revtodo and new in seen:
                     skipped.add(old)
                 seen.add(new)
         repo.ui.debug('computed skipped revs: %s\n' %
                         (' '.join(str(r) for r in sorted(skipped)) or None))
         repo.ui.debug('rebase status resumed\n')
         _setrebasesetvisibility(repo, set(state.keys()) | {originalwd})
 
         self.originalwd = originalwd
         self.dest = dest
         self.state = state
         self.skipped = skipped
         self.collapsef = collapse
         self.keepf = keep
         self.keepbranchesf = keepbranches
         self.external = external
         self.activebookmark = activebookmark
 
     def _handleskippingobsolete(self, rebaserevs, obsoleterevs, dest):
         """Compute structures necessary for skipping obsolete revisions
 
         rebaserevs:     iterable of all revisions that are to be rebased
         obsoleterevs:   iterable of all obsolete revisions in rebaseset
         dest:           a destination revision for the rebase operation
         """
         self.obsoletenotrebased = {}
         if not self.ui.configbool('experimental', 'rebaseskipobsolete',
                                   default=True):
             return
         rebaseset = set(rebaserevs)
         obsoleteset = set(obsoleterevs)
         self.obsoletenotrebased = _computeobsoletenotrebased(self.repo,
                                     obsoleteset, dest)
         skippedset = set(self.obsoletenotrebased)
         _checkobsrebase(self.repo, self.ui, obsoleteset, rebaseset, skippedset)
 
     def _prepareabortorcontinue(self, isabort):
         try:
             self.restorestatus()
             self.collapsemsg = restorecollapsemsg(self.repo, isabort)
         except error.RepoLookupError:
             if isabort:
                 clearstatus(self.repo)
                 clearcollapsemsg(self.repo)
                 self.repo.ui.warn(_('rebase aborted (no revision is removed,'
                                     ' only broken state is cleared)\n'))
                 return 0
             else:
                 msg = _('cannot continue inconsistent rebase')
                 hint = _('use "hg rebase --abort" to clear broken state')
                 raise error.Abort(msg, hint=hint)
         if isabort:
             return abort(self.repo, self.originalwd, self.dest,
                          self.state, activebookmark=self.activebookmark)
 
         obsrevs = (r for r, st in self.state.items() if st == revprecursor)
         self._handleskippingobsolete(self.state.keys(), obsrevs, self.dest)
 
     def _preparenewrebase(self, dest, rebaseset):
         if dest is None:
             return _nothingtorebase()
 
         allowunstable = obsolete.isenabled(self.repo, obsolete.allowunstableopt)
         if (not (self.keepf or allowunstable)
               and self.repo.revs('first(children(%ld) - %ld)',
                                  rebaseset, rebaseset)):
             raise error.Abort(
                 _("can't remove original changesets with"
                   " unrebased descendants"),
                 hint=_('use --keep to keep original changesets'))
 
         obsrevs = _filterobsoleterevs(self.repo, set(rebaseset))
         self._handleskippingobsolete(rebaseset, obsrevs, dest)
 
         result = buildstate(self.repo, dest, rebaseset, self.collapsef,
                             self.obsoletenotrebased)
 
         if not result:
             # Empty state built, nothing to rebase
             self.ui.status(_('nothing to rebase\n'))
             return _nothingtorebase()
 
         for root in self.repo.set('roots(%ld)', rebaseset):
             if not self.keepf and not root.mutable():
                 raise error.Abort(_("can't rebase public changeset %s")
                                   % root,
                                   hint=_("see 'hg help phases' for details"))
 
         (self.originalwd, self.dest, self.state) = result
         if self.collapsef:
             self.destancestors = self.repo.changelog.ancestors(
                                         [self.dest],
                                         inclusive=True)
             self.external = externalparent(self.repo, self.state,
                                               self.destancestors)
 
         if dest.closesbranch() and not self.keepbranchesf:
             self.ui.status(_('reopening closed branch head %s\n') % dest)
 
     def _performrebase(self, tr):
         repo, ui, opts = self.repo, self.ui, self.opts
         if self.keepbranchesf:
             # insert _savebranch at the start of extrafns so if
             # there's a user-provided extrafn it can clobber branch if
             # desired
             self.extrafns.insert(0, _savebranch)
             if self.collapsef:
                 branches = set()
                 for rev in self.state:
                     branches.add(repo[rev].branch())
                     if len(branches) > 1:
                         raise error.Abort(_('cannot collapse multiple named '
                             'branches'))
 
         # Rebase
         if not self.destancestors:
             self.destancestors = repo.changelog.ancestors([self.dest],
                                                           inclusive=True)
 
         # Keep track of the current bookmarks in order to reset them later
         self.currentbookmarks = repo._bookmarks.copy()
         self.activebookmark = self.activebookmark or repo._activebookmark
         if self.activebookmark:
             bookmarks.deactivate(repo)
 
         # Store the state before we begin so users can run 'hg rebase --abort'
         # if we fail before the transaction closes.
         self.storestatus()
 
         sortedrevs = repo.revs('sort(%ld, -topo)', self.state)
         cands = [k for k, v in self.state.iteritems() if v == revtodo]
         total = len(cands)
         pos = 0
         for rev in sortedrevs:
             ctx = repo[rev]
             desc = '%d:%s "%s"' % (ctx.rev(), ctx,
                                    ctx.description().split('\n', 1)[0])
             names = repo.nodetags(ctx.node()) + repo.nodebookmarks(ctx.node())
             if names:
                 desc += ' (%s)' % ' '.join(names)
             if self.state[rev] == rev:
                 ui.status(_('already rebased %s\n') % desc)
             elif self.state[rev] == revtodo:
                 pos += 1
                 ui.status(_('rebasing %s\n') % desc)
                 ui.progress(_("rebasing"), pos, ("%d:%s" % (rev, ctx)),
                             _('changesets'), total)
                 p1, p2, base = defineparents(repo, rev, self.dest,
                                              self.state,
                                              self.destancestors,
                                              self.obsoletenotrebased)
                 self.storestatus(tr=tr)
                 storecollapsemsg(repo, self.collapsemsg)
                 if len(repo[None].parents()) == 2:
                     repo.ui.debug('resuming interrupted rebase\n')
                 else:
                     try:
                         ui.setconfig('ui', 'forcemerge', opts.get('tool', ''),
                                      'rebase')
                         stats = rebasenode(repo, rev, p1, base, self.state,
                                            self.collapsef, self.dest)
                         if stats and stats[3] > 0:
                             raise error.InterventionRequired(
                                 _('unresolved conflicts (see hg '
                                   'resolve, then hg rebase --continue)'))
                     finally:
                         ui.setconfig('ui', 'forcemerge', '', 'rebase')
                 if not self.collapsef:
                     merging = p2 != nullrev
                     editform = cmdutil.mergeeditform(merging, 'rebase')
                     editor = cmdutil.getcommiteditor(editform=editform, **opts)
                     newnode = concludenode(repo, rev, p1, p2,
                                            extrafn=_makeextrafn(self.extrafns),
                                            editor=editor,
                                            keepbranches=self.keepbranchesf,
                                            date=self.date)
                     if newnode is None:
                         # If it ended up being a no-op commit, then the normal
                         # merge state clean-up path doesn't happen, so do it
                         # here. Fix issue5494
                         mergemod.mergestate.clean(repo)
                 else:
                     # Skip commit if we are collapsing
                     repo.setparents(repo[p1].node())
                     newnode = None
                 # Update the state
                 if newnode is not None:
                     self.state[rev] = repo[newnode].rev()
                     ui.debug('rebased as %s\n' % short(newnode))
                 else:
                     if not self.collapsef:
                         ui.warn(_('note: rebase of %d:%s created no changes '
                                   'to commit\n') % (rev, ctx))
                         self.skipped.add(rev)
                     self.state[rev] = p1
                     ui.debug('next revision set to %s\n' % p1)
             elif self.state[rev] == nullmerge:
                 ui.debug('ignoring null merge rebase of %s\n' % rev)
             elif self.state[rev] == revignored:
                 ui.status(_('not rebasing ignored %s\n') % desc)
             elif self.state[rev] == revprecursor:
                 destctx = repo[self.obsoletenotrebased[rev]]
                 descdest = '%d:%s "%s"' % (destctx.rev(), destctx,
                            destctx.description().split('\n', 1)[0])
                 msg = _('note: not rebasing %s, already in destination as %s\n')
                 ui.status(msg % (desc, descdest))
             elif self.state[rev] == revpruned:
                 msg = _('note: not rebasing %s, it has no successor\n')
                 ui.status(msg % desc)
             else:
                 ui.status(_('already rebased %s as %s\n') %
                           (desc, repo[self.state[rev]]))
 
         ui.progress(_('rebasing'), None)
         ui.note(_('rebase merging completed\n'))
 
     def _finishrebase(self):
         repo, ui, opts = self.repo, self.ui, self.opts
         if self.collapsef and not self.keepopen:
             p1, p2, _base = defineparents(repo, min(self.state),
                                           self.dest, self.state,
                                           self.destancestors,
                                           self.obsoletenotrebased)
             editopt = opts.get('edit')
             editform = 'rebase.collapse'
             if self.collapsemsg:
                 commitmsg = self.collapsemsg
             else:
                 commitmsg = 'Collapsed revision'
                 for rebased in self.state:
                     if rebased not in self.skipped and\
                        self.state[rebased] > nullmerge:
                         commitmsg += '\n* %s' % repo[rebased].description()
                 editopt = True
             editor = cmdutil.getcommiteditor(edit=editopt, editform=editform)
             revtoreuse = max(self.state)
             dsguard = dirstateguard.dirstateguard(repo, 'rebase')
             try:
                 newnode = concludenode(repo, revtoreuse, p1, self.external,
                                        commitmsg=commitmsg,
                                        extrafn=_makeextrafn(self.extrafns),
                                        editor=editor,
                                        keepbranches=self.keepbranchesf,
                                        date=self.date)
                 dsguard.close()
                 release(dsguard)
             except error.InterventionRequired:
                 dsguard.close()
                 release(dsguard)
                 raise
             except Exception:
                 release(dsguard)
                 raise
 
             if newnode is None:
                 newrev = self.dest
             else:
                 newrev = repo[newnode].rev()
             for oldrev in self.state.iterkeys():
                 if self.state[oldrev] > nullmerge:
                     self.state[oldrev] = newrev
 
         if 'qtip' in repo.tags():
             updatemq(repo, self.state, self.skipped, **opts)
 
         if self.currentbookmarks:
             # Nodeids are needed to reset bookmarks
             nstate = {}
             for k, v in self.state.iteritems():
                 if v > nullmerge and v != k:
                     nstate[repo[k].node()] = repo[v].node()
                 elif v == revprecursor:
                     succ = self.obsoletenotrebased[k]
                     nstate[repo[k].node()] = repo[succ].node()
             # XXX this is the same as dest.node() for the non-continue path --
             # this should probably be cleaned up
             destnode = repo[self.dest].node()
 
         # restore original working directory
         # (we do this before stripping)
         newwd = self.state.get(self.originalwd, self.originalwd)
         if newwd == revprecursor:
             newwd = self.obsoletenotrebased[self.originalwd]
         elif newwd < 0:
             # original directory is a parent of rebase set root or ignored
             newwd = self.originalwd
         if newwd not in [c.rev() for c in repo[None].parents()]:
             ui.note(_("update back to initial working directory parent\n"))
             hg.updaterepo(repo, newwd, False)
 
         if self.currentbookmarks:
             with repo.transaction('bookmark') as tr:
                 updatebookmarks(repo, destnode, nstate,
                                 self.currentbookmarks, tr)
                 if self.activebookmark not in repo._bookmarks:
                     # active bookmark was divergent one and has been deleted
                     self.activebookmark = None
 
         if not self.keepf:
             collapsedas = None
             if self.collapsef:
                 collapsedas = newnode
             clearrebased(ui, repo, self.state, self.skipped, collapsedas)
 
         clearstatus(repo)
         clearcollapsemsg(repo)
 
         ui.note(_("rebase completed\n"))
         util.unlinkpath(repo.sjoin('undo'), ignoremissing=True)
         if self.skipped:
             skippedlen = len(self.skipped)
             ui.note(_("%d revisions have been skipped\n") % skippedlen)
 
         if (self.activebookmark and
             repo['.'].node() == repo._bookmarks[self.activebookmark]):
                 bookmarks.activate(repo, self.activebookmark)
 
 @command('rebase',
     [('s', 'source', '',
      _('rebase the specified changeset and descendants'), _('REV')),
     ('b', 'base', '',
      _('rebase everything from branching point of specified changeset'),
      _('REV')),
     ('r', 'rev', [],
      _('rebase these revisions'),
      _('REV')),
     ('d', 'dest', '',
      _('rebase onto the specified changeset'), _('REV')),
     ('', 'collapse', False, _('collapse the rebased changesets')),
     ('m', 'message', '',
      _('use text as collapse commit message'), _('TEXT')),
     ('e', 'edit', False, _('invoke editor on commit messages')),
     ('l', 'logfile', '',
      _('read collapse commit message from file'), _('FILE')),
     ('k', 'keep', False, _('keep original changesets')),
     ('', 'keepbranches', False, _('keep original branch names')),
     ('D', 'detach', False, _('(DEPRECATED)')),
     ('i', 'interactive', False, _('(DEPRECATED)')),
     ('t', 'tool', '', _('specify merge tool')),
     ('c', 'continue', False, _('continue an interrupted rebase')),
     ('a', 'abort', False, _('abort an interrupted rebase'))] +
      templateopts,
     _('[-s REV | -b REV] [-d REV] [OPTION]'))
 def rebase(ui, repo, **opts):
     """move changeset (and descendants) to a different branch
 
     Rebase uses repeated merging to graft changesets from one part of
     history (the source) onto another (the destination). This can be
     useful for linearizing *local* changes relative to a master
     development tree.
 
     Published commits cannot be rebased (see :hg:`help phases`).
     To copy commits, see :hg:`help graft`.
 
     If you don't specify a destination changeset (``-d/--dest``), rebase
     will use the same logic as :hg:`merge` to pick a destination.  if
     the current branch contains exactly one other head, the other head
     is merged with by default.  Otherwise, an explicit revision with
     which to merge with must be provided.  (destination changeset is not
     modified by rebasing, but new changesets are added as its
     descendants.)
 
     Here are the ways to select changesets:
 
       1. Explicitly select them using ``--rev``.
 
       2. Use ``--source`` to select a root changeset and include all of its
          descendants.
 
       3. Use ``--base`` to select a changeset; rebase will find ancestors
          and their descendants which are not also ancestors of the destination.
 
       4. If you do not specify any of ``--rev``, ``source``, or ``--base``,
          rebase will use ``--base .`` as above.
 
     Rebase will destroy original changesets unless you use ``--keep``.
     It will also move your bookmarks (even if you do).
 
     Some changesets may be dropped if they do not contribute changes
     (e.g. merges from the destination branch).
 
     Unlike ``merge``, rebase will do nothing if you are at the branch tip of
     a named branch with two heads. You will need to explicitly specify source
     and/or destination.
 
     If you need to use a tool to automate merge/conflict decisions, you
     can specify one with ``--tool``, see :hg:`help merge-tools`.
     As a caveat: the tool will not be used to mediate when a file was
     deleted, there is no hook presently available for this.
 
     If a rebase is interrupted to manually resolve a conflict, it can be
     continued with --continue/-c or aborted with --abort/-a.
 
     .. container:: verbose
 
       Examples:
 
       - move "local changes" (current commit back to branching point)
         to the current branch tip after a pull::
 
           hg rebase
 
       - move a single changeset to the stable branch::
 
           hg rebase -r 5f493448 -d stable
 
       - splice a commit and all its descendants onto another part of history::
 
           hg rebase --source c0c3 --dest 4cf9
 
       - rebase everything on a branch marked by a bookmark onto the
         default branch::
 
           hg rebase --base myfeature --dest default
 
       - collapse a sequence of changes into a single commit::
 
           hg rebase --collapse -r 1520:1525 -d .
 
       - move a named branch while preserving its name::
 
           hg rebase -r "branch(featureX)" -d 1.3 --keepbranches
 
     Configuration Options:
 
     You can make rebase require a destination if you set the following config
     option::
 
       [commands]
       rebase.requiredest = True
 
     Return Values:
 
     Returns 0 on success, 1 if nothing to rebase or there are
     unresolved conflicts.
 
     """
     rbsrt = rebaseruntime(repo, ui, opts)
 
     with repo.wlock(), repo.lock():
         # Validate input and define rebasing points
         destf = opts.get('dest', None)
         srcf = opts.get('source', None)
         basef = opts.get('base', None)
         revf = opts.get('rev', [])
         # search default destination in this space
         # used in the 'hg pull --rebase' case, see issue 5214.
         destspace = opts.get('_destspace')
         contf = opts.get('continue')
         abortf = opts.get('abort')
         if opts.get('interactive'):
             try:
                 if extensions.find('histedit'):
                     enablehistedit = ''
             except KeyError:
                 enablehistedit = " --config extensions.histedit="
             help = "hg%s help -e histedit" % enablehistedit
             msg = _("interactive history editing is supported by the "
                     "'histedit' extension (see \"%s\")") % help
             raise error.Abort(msg)
 
         if rbsrt.collapsemsg and not rbsrt.collapsef:
             raise error.Abort(
                 _('message can only be specified with collapse'))
 
         if contf or abortf:
             if contf and abortf:
                 raise error.Abort(_('cannot use both abort and continue'))
             if rbsrt.collapsef:
                 raise error.Abort(
                     _('cannot use collapse with continue or abort'))
             if srcf or basef or destf:
                 raise error.Abort(
                     _('abort and continue do not allow specifying revisions'))
             if abortf and opts.get('tool', False):
                 ui.warn(_('tool option will be ignored\n'))
             if contf:
                 ms = mergemod.mergestate.read(repo)
                 mergeutil.checkunresolved(ms)
 
             retcode = rbsrt._prepareabortorcontinue(abortf)
             if retcode is not None:
                 return retcode
         else:
             dest, rebaseset = _definesets(ui, repo, destf, srcf, basef, revf,
                                           destspace=destspace)
             retcode = rbsrt._preparenewrebase(dest, rebaseset)
             if retcode is not None:
                 return retcode
 
         with repo.transaction('rebase') as tr:
             dsguard = dirstateguard.dirstateguard(repo, 'rebase')
             try:
                 rbsrt._performrebase(tr)
                 dsguard.close()
                 release(dsguard)
             except error.InterventionRequired:
                 dsguard.close()
                 release(dsguard)
                 tr.close()
                 raise
             except Exception:
                 release(dsguard)
                 raise
         rbsrt._finishrebase()
 
 def _definesets(ui, repo, destf=None, srcf=None, basef=None, revf=None,
                 destspace=None):
     """use revisions argument to define destination and rebase set
     """
     if revf is None:
         revf = []
 
     # destspace is here to work around issues with `hg pull --rebase` see
     # issue5214 for details
     if srcf and basef:
         raise error.Abort(_('cannot specify both a source and a base'))
     if revf and basef:
         raise error.Abort(_('cannot specify both a revision and a base'))
     if revf and srcf:
         raise error.Abort(_('cannot specify both a revision and a source'))
 
     cmdutil.checkunfinished(repo)
     cmdutil.bailifchanged(repo)
 
     if ui.configbool('commands', 'rebase.requiredest') and not destf:
         raise error.Abort(_('you must specify a destination'),
                           hint=_('use: hg rebase -d REV'))
 
     if destf:
         dest = scmutil.revsingle(repo, destf)
 
     if revf:
         rebaseset = scmutil.revrange(repo, revf)
         if not rebaseset:
             ui.status(_('empty "rev" revision set - nothing to rebase\n'))
             return None, None
     elif srcf:
         src = scmutil.revrange(repo, [srcf])
         if not src:
             ui.status(_('empty "source" revision set - nothing to rebase\n'))
             return None, None
         rebaseset = repo.revs('(%ld)::', src)
         assert rebaseset
     else:
         base = scmutil.revrange(repo, [basef or '.'])
         if not base:
             ui.status(_('empty "base" revision set - '
                         "can't compute rebase set\n"))
             return None, None
         if not destf:
             dest = repo[_destrebase(repo, base, destspace=destspace)]
             destf = str(dest)
 
         roots = [] # selected children of branching points
         bpbase = {} # {branchingpoint: [origbase]}
         for b in base: # group bases by branching points
             bp = repo.revs('ancestor(%d, %d)', b, dest).first()
             bpbase[bp] = bpbase.get(bp, []) + [b]
         if None in bpbase:
             # emulate the old behavior, showing "nothing to rebase" (a better
             # behavior may be abort with "cannot find branching point" error)
             bpbase.clear()
         for bp, bs in bpbase.iteritems(): # calculate roots
             roots += list(repo.revs('children(%d) & ancestors(%ld)', bp, bs))
 
         rebaseset = repo.revs('%ld::', roots)
 
         if not rebaseset:
             # transform to list because smartsets are not comparable to
             # lists. This should be improved to honor laziness of
             # smartset.
             if list(base) == [dest.rev()]:
                 if basef:
                     ui.status(_('nothing to rebase - %s is both "base"'
                                 ' and destination\n') % dest)
                 else:
                     ui.status(_('nothing to rebase - working directory '
                                 'parent is also destination\n'))
             elif not repo.revs('%ld - ::%d', base, dest):
                 if basef:
                     ui.status(_('nothing to rebase - "base" %s is '
                                 'already an ancestor of destination '
                                 '%s\n') %
                               ('+'.join(str(repo[r]) for r in base),
                                dest))
                 else:
                     ui.status(_('nothing to rebase - working '
                                 'directory parent is already an '
                                 'ancestor of destination %s\n') % dest)
             else: # can it happen?
                 ui.status(_('nothing to rebase from %s to %s\n') %
                           ('+'.join(str(repo[r]) for r in base), dest))
             return None, None
 
     if not destf:
         dest = repo[_destrebase(repo, rebaseset, destspace=destspace)]
         destf = str(dest)
 
     return dest, rebaseset
 
 def externalparent(repo, state, destancestors):
     """Return the revision that should be used as the second parent
     when the revisions in state is collapsed on top of destancestors.
     Abort if there is more than one parent.
     """
     parents = set()
     source = min(state)
     for rev in state:
         if rev == source:
             continue
         for p in repo[rev].parents():
             if (p.rev() not in state
                         and p.rev() not in destancestors):
                 parents.add(p.rev())
     if not parents:
         return nullrev
     if len(parents) == 1:
         return parents.pop()
     raise error.Abort(_('unable to collapse on top of %s, there is more '
                        'than one external parent: %s') %
                      (max(destancestors),
                       ', '.join(str(p) for p in sorted(parents))))
 
 def concludenode(repo, rev, p1, p2, commitmsg=None, editor=None, extrafn=None,
                  keepbranches=False, date=None):
     '''Commit the wd changes with parents p1 and p2. Reuse commit info from rev
     but also store useful information in extra.
     Return node of committed revision.'''
     repo.setparents(repo[p1].node(), repo[p2].node())
     ctx = repo[rev]
     if commitmsg is None:
         commitmsg = ctx.description()
     keepbranch = keepbranches and repo[p1].branch() != ctx.branch()
     extra = {'rebase_source': ctx.hex()}
     if extrafn:
         extrafn(ctx, extra)
 
     destphase = max(ctx.phase(), phases.draft)
     overrides = {('phases', 'new-commit'): destphase}
     with repo.ui.configoverride(overrides, 'rebase'):
         if keepbranch:
             repo.ui.setconfig('ui', 'allowemptycommit', True)
         # Commit might fail if unresolved files exist
         if date is None:
             date = ctx.date()
         newnode = repo.commit(text=commitmsg, user=ctx.user(),
                               date=date, extra=extra, editor=editor)
 
     repo.dirstate.setbranch(repo[newnode].branch())
     return newnode
 
 def rebasenode(repo, rev, p1, base, state, collapse, dest):
     'Rebase a single revision rev on top of p1 using base as merge ancestor'
     # Merge phase
     # Update to destination and merge it with local
     if repo['.'].rev() != p1:
         repo.ui.debug(" update to %d:%s\n" % (p1, repo[p1]))
         mergemod.update(repo, p1, False, True)
     else:
         repo.ui.debug(" already in destination\n")
     repo.dirstate.write(repo.currenttransaction())
     repo.ui.debug(" merge against %d:%s\n" % (rev, repo[rev]))
     if base is not None:
         repo.ui.debug("   detach base %d:%s\n" % (base, repo[base]))
     # When collapsing in-place, the parent is the common ancestor, we
     # have to allow merging with it.
     stats = mergemod.update(repo, rev, True, True, base, collapse,
                             labels=['dest', 'source'])
     if collapse:
         copies.duplicatecopies(repo, rev, dest)
     else:
         # If we're not using --collapse, we need to
         # duplicate copies between the revision we're
         # rebasing and its first parent, but *not*
         # duplicate any copies that have already been
         # performed in the destination.
         p1rev = repo[rev].p1().rev()
         copies.duplicatecopies(repo, rev, p1rev, skiprev=dest)
     return stats
 
 def nearestrebased(repo, rev, state):
     """return the nearest ancestors of rev in the rebase result"""
     rebased = [r for r in state if state[r] > nullmerge]
     candidates = repo.revs('max(%ld  and (::%d))', rebased, rev)
     if candidates:
         return state[candidates.first()]
     else:
         return None
 
 def _checkobsrebase(repo, ui, rebaseobsrevs, rebasesetrevs, rebaseobsskipped):
     """
     Abort if rebase will create divergence or rebase is noop because of markers
 
     `rebaseobsrevs`: set of obsolete revision in source
     `rebasesetrevs`: set of revisions to be rebased from source
     `rebaseobsskipped`: set of revisions from source skipped because they have
     successors in destination
     """
     # Obsolete node with successors not in dest leads to divergence
     divergenceok = ui.configbool('experimental',
                                  'allowdivergence')
     divergencebasecandidates = rebaseobsrevs - rebaseobsskipped
 
     if divergencebasecandidates and not divergenceok:
         divhashes = (str(repo[r])
                      for r in divergencebasecandidates)
         msg = _("this rebase will cause "
                 "divergences from: %s")
         h = _("to force the rebase please set "
               "experimental.allowdivergence=True")
         raise error.Abort(msg % (",".join(divhashes),), hint=h)
 
 def defineparents(repo, rev, dest, state, destancestors,
                   obsoletenotrebased):
     'Return the new parent relationship of the revision that will be rebased'
     parents = repo[rev].parents()
     p1 = p2 = nullrev
     rp1 = None
 
     p1n = parents[0].rev()
     if p1n in destancestors:
         p1 = dest
     elif p1n in state:
         if state[p1n] == nullmerge:
             p1 = dest
         elif state[p1n] in revskipped:
             p1 = nearestrebased(repo, p1n, state)
             if p1 is None:
                 p1 = dest
         else:
             p1 = state[p1n]
     else: # p1n external
         p1 = dest
         p2 = p1n
 
     if len(parents) == 2 and parents[1].rev() not in destancestors:
         p2n = parents[1].rev()
         # interesting second parent
         if p2n in state:
             if p1 == dest: # p1n in destancestors or external
                 p1 = state[p2n]
                 if p1 == revprecursor:
                     rp1 = obsoletenotrebased[p2n]
             elif state[p2n] in revskipped:
                 p2 = nearestrebased(repo, p2n, state)
                 if p2 is None:
                     # no ancestors rebased yet, detach
                     p2 = dest
             else:
                 p2 = state[p2n]
         else: # p2n external
             if p2 != nullrev: # p1n external too => rev is a merged revision
                 raise error.Abort(_('cannot use revision %d as base, result '
                         'would have 3 parents') % rev)
             p2 = p2n
     repo.ui.debug(" future parents are %d and %d\n" %
                             (repo[rp1 or p1].rev(), repo[p2].rev()))
 
     if not any(p.rev() in state for p in parents):
         # Case (1) root changeset of a non-detaching rebase set.
         # Let the merge mechanism find the base itself.
         base = None
     elif not repo[rev].p2():
         # Case (2) detaching the node with a single parent, use this parent
         base = repo[rev].p1().rev()
     else:
         # Assuming there is a p1, this is the case where there also is a p2.
         # We are thus rebasing a merge and need to pick the right merge base.
         #
         # Imagine we have:
         # - M: current rebase revision in this step
         # - A: one parent of M
         # - B: other parent of M
         # - D: destination of this merge step (p1 var)
         #
         # Consider the case where D is a descendant of A or B and the other is
         # 'outside'. In this case, the right merge base is the D ancestor.
         #
         # An informal proof, assuming A is 'outside' and B is the D ancestor:
         #
         # If we pick B as the base, the merge involves:
         # - changes from B to M (actual changeset payload)
         # - changes from B to D (induced by rebase) as D is a rebased
         #   version of B)
         # Which exactly represent the rebase operation.
         #
         # If we pick A as the base, the merge involves:
         # - changes from A to M (actual changeset payload)
         # - changes from A to D (with include changes between unrelated A and B
         #   plus changes induced by rebase)
         # Which does not represent anything sensible and creates a lot of
         # conflicts. A is thus not the right choice - B is.
         #
         # Note: The base found in this 'proof' is only correct in the specified
         # case. This base does not make sense if is not D a descendant of A or B
         # or if the other is not parent 'outside' (especially not if the other
         # parent has been rebased). The current implementation does not
         # make it feasible to consider different cases separately. In these
         # other cases we currently just leave it to the user to correctly
         # resolve an impossible merge using a wrong ancestor.
         #
         # xx, p1 could be -4, and both parents could probably be -4...
         for p in repo[rev].parents():
             if state.get(p.rev()) == p1:
                 base = p.rev()
                 break
         else: # fallback when base not found
             base = None
 
             # Raise because this function is called wrong (see issue 4106)
             raise AssertionError('no base found to rebase on '
                                  '(defineparents called wrong)')
     return rp1 or p1, p2, base
 
 def isagitpatch(repo, patchname):
     'Return true if the given patch is in git format'
     mqpatch = os.path.join(repo.mq.path, patchname)
     for line in patch.linereader(file(mqpatch, 'rb')):
         if line.startswith('diff --git'):
             return True
     return False
 
 def updatemq(repo, state, skipped, **opts):
     'Update rebased mq patches - finalize and then import them'
     mqrebase = {}
     mq = repo.mq
     original_series = mq.fullseries[:]
     skippedpatches = set()
 
     for p in mq.applied:
         rev = repo[p.node].rev()
         if rev in state:
             repo.ui.debug('revision %d is an mq patch (%s), finalize it.\n' %
                                         (rev, p.name))
             mqrebase[rev] = (p.name, isagitpatch(repo, p.name))
         else:
             # Applied but not rebased, not sure this should happen
             skippedpatches.add(p.name)
 
     if mqrebase:
         mq.finish(repo, mqrebase.keys())
 
         # We must start import from the newest revision
         for rev in sorted(mqrebase, reverse=True):
             if rev not in skipped:
                 name, isgit = mqrebase[rev]
                 repo.ui.note(_('updating mq patch %s to %s:%s\n') %
                              (name, state[rev], repo[state[rev]]))
                 mq.qimport(repo, (), patchname=name, git=isgit,
                                 rev=[str(state[rev])])
             else:
                 # Rebased and skipped
                 skippedpatches.add(mqrebase[rev][0])
 
         # Patches were either applied and rebased and imported in
         # order, applied and removed or unapplied. Discard the removed
         # ones while preserving the original series order and guards.
         newseries = [s for s in original_series
                      if mq.guard_re.split(s, 1)[0] not in skippedpatches]
         mq.fullseries[:] = newseries
         mq.seriesdirty = True
         mq.savedirty()
 
 def updatebookmarks(repo, destnode, nstate, originalbookmarks, tr):
     'Move bookmarks to their correct changesets, and delete divergent ones'
     marks = repo._bookmarks
     for k, v in originalbookmarks.iteritems():
         if v in nstate:
             # update the bookmarks for revs that have moved
             marks[k] = nstate[v]
             bookmarks.deletedivergent(repo, [destnode], k)
     marks.recordchange(tr)
 
 def storecollapsemsg(repo, collapsemsg):
     'Store the collapse message to allow recovery'
     collapsemsg = collapsemsg or ''
     f = repo.vfs("last-message.txt", "w")
     f.write("%s\n" % collapsemsg)
     f.close()
 
 def clearcollapsemsg(repo):
     'Remove collapse message file'
     repo.vfs.unlinkpath("last-message.txt", ignoremissing=True)
 
 def restorecollapsemsg(repo, isabort):
     'Restore previously stored collapse message'
     try:
         f = repo.vfs("last-message.txt")
         collapsemsg = f.readline().strip()
         f.close()
     except IOError as err:
         if err.errno != errno.ENOENT:
             raise
         if isabort:
             # Oh well, just abort like normal
             collapsemsg = ''
         else:
             raise error.Abort(_('missing .hg/last-message.txt for rebase'))
     return collapsemsg
 
 def clearstatus(repo):
     'Remove the status files'
     _clearrebasesetvisibiliy(repo)
+    # Make sure the active transaction won't write the state file
+    tr = repo.currenttransaction()
+    if tr:
+        tr.removefilegenerator('rebasestate')
     repo.vfs.unlinkpath("rebasestate", ignoremissing=True)
 
 def needupdate(repo, state):
     '''check whether we should `update --clean` away from a merge, or if
     somehow the working dir got forcibly updated, e.g. by older hg'''
     parents = [p.rev() for p in repo[None].parents()]
 
     # Are we in a merge state at all?
     if len(parents) < 2:
         return False
 
     # We should be standing on the first as-of-yet unrebased commit.
     firstunrebased = min([old for old, new in state.iteritems()
                           if new == nullrev])
     if firstunrebased in parents:
         return True
 
     return False
 
 def abort(repo, originalwd, dest, state, activebookmark=None):
     '''Restore the repository to its original state.  Additional args:
 
     activebookmark: the name of the bookmark that should be active after the
         restore'''
 
     try:
         # If the first commits in the rebased set get skipped during the rebase,
         # their values within the state mapping will be the dest rev id. The
         # dstates list must must not contain the dest rev (issue4896)
         dstates = [s for s in state.values() if s >= 0 and s != dest]
         immutable = [d for d in dstates if not repo[d].mutable()]
         cleanup = True
         if immutable:
             repo.ui.warn(_("warning: can't clean up public changesets %s\n")
                         % ', '.join(str(repo[r]) for r in immutable),
                         hint=_("see 'hg help phases' for details"))
             cleanup = False
 
         descendants = set()
         if dstates:
             descendants = set(repo.changelog.descendants(dstates))
         if descendants - set(dstates):
             repo.ui.warn(_("warning: new changesets detected on destination "
                            "branch, can't strip\n"))
             cleanup = False
 
         if cleanup:
             shouldupdate = False
             rebased = filter(lambda x: x >= 0 and x != dest, state.values())
             if rebased:
                 strippoints = [
                         c.node() for c in repo.set('roots(%ld)', rebased)]
 
             updateifonnodes = set(rebased)
             updateifonnodes.add(dest)
             updateifonnodes.add(originalwd)
             shouldupdate = repo['.'].rev() in updateifonnodes
 
             # Update away from the rebase if necessary
             if shouldupdate or needupdate(repo, state):
                 mergemod.update(repo, originalwd, False, True)
 
             # Strip from the first rebased revision
             if rebased:
                 # no backup of rebased cset versions needed
                 repair.strip(repo.ui, repo, strippoints)
 
         if activebookmark and activebookmark in repo._bookmarks:
             bookmarks.activate(repo, activebookmark)
 
     finally:
         clearstatus(repo)
         clearcollapsemsg(repo)
         repo.ui.warn(_('rebase aborted\n'))
     return 0
 
 def buildstate(repo, dest, rebaseset, collapse, obsoletenotrebased):
     '''Define which revisions are going to be rebased and where
 
     repo: repo
     dest: context
     rebaseset: set of rev
     '''
     originalwd = repo['.'].rev()
     _setrebasesetvisibility(repo, set(rebaseset) | {originalwd})
 
     # This check isn't strictly necessary, since mq detects commits over an
     # applied patch. But it prevents messing up the working directory when
     # a partially completed rebase is blocked by mq.
     if 'qtip' in repo.tags() and (dest.node() in
                             [s.node for s in repo.mq.applied]):
         raise error.Abort(_('cannot rebase onto an applied mq patch'))
 
     roots = list(repo.set('roots(%ld)', rebaseset))
     if not roots:
         raise error.Abort(_('no matching revisions'))
     roots.sort()
     state = dict.fromkeys(rebaseset, revtodo)
     detachset = set()
     emptyrebase = True
     for root in roots:
         commonbase = root.ancestor(dest)
         if commonbase == root:
             raise error.Abort(_('source is ancestor of destination'))
         if commonbase == dest:
             wctx = repo[None]
             if dest == wctx.p1():
                 # when rebasing to '.', it will use the current wd branch name
                 samebranch = root.branch() == wctx.branch()
             else:
                 samebranch = root.branch() == dest.branch()
             if not collapse and samebranch and dest in root.parents():
                 # mark the revision as done by setting its new revision
                 # equal to its old (current) revisions
                 state[root.rev()] = root.rev()
                 repo.ui.debug('source is a child of destination\n')
                 continue
 
         emptyrebase = False
         repo.ui.debug('rebase onto %s starting from %s\n' % (dest, root))
         # Rebase tries to turn <dest> into a parent of <root> while
         # preserving the number of parents of rebased changesets:
         #
         # - A changeset with a single parent will always be rebased as a
         #   changeset with a single parent.
         #
         # - A merge will be rebased as merge unless its parents are both
         #   ancestors of <dest> or are themselves in the rebased set and
         #   pruned while rebased.
         #
         # If one parent of <root> is an ancestor of <dest>, the rebased
         # version of this parent will be <dest>. This is always true with
         # --base option.
         #
         # Otherwise, we need to *replace* the original parents with
         # <dest>. This "detaches" the rebased set from its former location
         # and rebases it onto <dest>. Changes introduced by ancestors of
         # <root> not common with <dest> (the detachset, marked as
         # nullmerge) are "removed" from the rebased changesets.
         #
         # - If <root> has a single parent, set it to <dest>.
         #
         # - If <root> is a merge, we cannot decide which parent to
         #   replace, the rebase operation is not clearly defined.
         #
         # The table below sums up this behavior:
         #
         # +------------------+----------------------+-------------------------+
         # |                  |     one parent       |  merge                  |
         # +------------------+----------------------+-------------------------+
         # | parent in        | new parent is <dest> | parents in ::<dest> are |
         # | ::<dest>         |                      | remapped to <dest>      |
         # +------------------+----------------------+-------------------------+
         # | unrelated source | new parent is <dest> | ambiguous, abort        |
         # +------------------+----------------------+-------------------------+
         #
         # The actual abort is handled by `defineparents`
         if len(root.parents()) <= 1:
             # ancestors of <root> not ancestors of <dest>
             detachset.update(repo.changelog.findmissingrevs([commonbase.rev()],
                                                             [root.rev()]))
     if emptyrebase:
         return None
     for rev in sorted(state):
         parents = [p for p in repo.changelog.parentrevs(rev) if p != nullrev]
         # if all parents of this revision are done, then so is this revision
         if parents and all((state.get(p) == p for p in parents)):
             state[rev] = rev
     for r in detachset:
         if r not in state:
             state[r] = nullmerge
     if len(roots) > 1:
         # If we have multiple roots, we may have "hole" in the rebase set.
         # Rebase roots that descend from those "hole" should not be detached as
         # other root are. We use the special `revignored` to inform rebase that
         # the revision should be ignored but that `defineparents` should search
         # a rebase destination that make sense regarding rebased topology.
         rebasedomain = set(repo.revs('%ld::%ld', rebaseset, rebaseset))
         for ignored in set(rebasedomain) - set(rebaseset):
             state[ignored] = revignored
     for r in obsoletenotrebased:
         if obsoletenotrebased[r] is None:
             state[r] = revpruned
         else:
             state[r] = revprecursor
     return originalwd, dest.rev(), state
 
 def clearrebased(ui, repo, state, skipped, collapsedas=None):
     """dispose of rebased revision at the end of the rebase
 
     If `collapsedas` is not None, the rebase was a collapse whose result if the
     `collapsedas` node."""
     if obsolete.isenabled(repo, obsolete.createmarkersopt):
         markers = []
         for rev, newrev in sorted(state.items()):
             if newrev >= 0 and newrev != rev:
                 if rev in skipped:
                     succs = ()
                 elif collapsedas is not None:
                     succs = (repo[collapsedas],)
                 else:
                     succs = (repo[newrev],)
                 markers.append((repo[rev], succs))
         if markers:
             obsolete.createmarkers(repo, markers, operation='rebase')
     else:
         rebased = [rev for rev in state
                    if state[rev] > nullmerge and state[rev] != rev]
         if rebased:
             stripped = []
             for root in repo.set('roots(%ld)', rebased):
                 if set(repo.changelog.descendants([root.rev()])) - set(state):
                     ui.warn(_("warning: new changesets detected "
                               "on source branch, not stripping\n"))
                 else:
                     stripped.append(root.node())
             if stripped:
                 # backup the old csets by default
                 repair.strip(ui, repo, stripped, "all")
 
 
 def pullrebase(orig, ui, repo, *args, **opts):
     'Call rebase after pull if the latter has been invoked with --rebase'
     ret = None
     if opts.get('rebase'):
         if ui.configbool('commands', 'rebase.requiredest'):
             msg = _('rebase destination required by configuration')
             hint = _('use hg pull followed by hg rebase -d DEST')
             raise error.Abort(msg, hint=hint)
 
         with repo.wlock(), repo.lock():
             if opts.get('update'):
                 del opts['update']
                 ui.debug('--update and --rebase are not compatible, ignoring '
                          'the update flag\n')
 
             cmdutil.checkunfinished(repo)
             cmdutil.bailifchanged(repo, hint=_('cannot pull with rebase: '
                 'please commit or shelve your changes first'))
 
             revsprepull = len(repo)
             origpostincoming = commands.postincoming
             def _dummy(*args, **kwargs):
                 pass
             commands.postincoming = _dummy
             try:
                 ret = orig(ui, repo, *args, **opts)
             finally:
                 commands.postincoming = origpostincoming
             revspostpull = len(repo)
             if revspostpull > revsprepull:
                 # --rev option from pull conflict with rebase own --rev
                 # dropping it
                 if 'rev' in opts:
                     del opts['rev']
                 # positional argument from pull conflicts with rebase's own
                 # --source.
                 if 'source' in opts:
                     del opts['source']
                 # revsprepull is the len of the repo, not revnum of tip.
                 destspace = list(repo.changelog.revs(start=revsprepull))
                 opts['_destspace'] = destspace
                 try:
                     rebase(ui, repo, **opts)
                 except error.NoMergeDestAbort:
                     # we can maybe update instead
                     rev, _a, _b = destutil.destupdate(repo)
                     if rev == repo['.'].rev():
                         ui.status(_('nothing to rebase\n'))
                     else:
                         ui.status(_('nothing to rebase - updating instead\n'))
                         # not passing argument to get the bare update behavior
                         # with warning and trumpets
                         commands.update(ui, repo)
     else:
         if opts.get('tool'):
             raise error.Abort(_('--tool can only be used with --rebase'))
         ret = orig(ui, repo, *args, **opts)
 
     return ret
 
 def _setrebasesetvisibility(repo, revs):
     """store the currently rebased set on the repo object
 
     This is used by another function to prevent rebased revision to because
     hidden (see issue4504)"""
     repo = repo.unfiltered()
     repo._rebaseset = revs
     # invalidate cache if visibility changes
     hiddens = repo.filteredrevcache.get('visible', set())
     if revs & hiddens:
         repo.invalidatevolatilesets()
 
 def _clearrebasesetvisibiliy(repo):
     """remove rebaseset data from the repo"""
     repo = repo.unfiltered()
     if '_rebaseset' in vars(repo):
         del repo._rebaseset
 
 def _rebasedvisible(orig, repo):
     """ensure rebased revs stay visible (see issue4504)"""
     blockers = orig(repo)
     blockers.update(getattr(repo, '_rebaseset', ()))
     return blockers
 
 def _filterobsoleterevs(repo, revs):
     """returns a set of the obsolete revisions in revs"""
     return set(r for r in revs if repo[r].obsolete())
 
 def _computeobsoletenotrebased(repo, rebaseobsrevs, dest):
     """return a mapping obsolete => successor for all obsolete nodes to be
     rebased that have a successors in the destination
 
     obsolete => None entries in the mapping indicate nodes with no successor"""
     obsoletenotrebased = {}
 
     # Build a mapping successor => obsolete nodes for the obsolete
     # nodes to be rebased
     allsuccessors = {}
     cl = repo.changelog
     for r in rebaseobsrevs:
         node = cl.node(r)
         for s in obsolete.allsuccessors(repo.obsstore, [node]):
             try:
                 allsuccessors[cl.rev(s)] = cl.rev(node)
             except LookupError:
                 pass
 
     if allsuccessors:
         # Look for successors of obsolete nodes to be rebased among
         # the ancestors of dest
         ancs = cl.ancestors([repo[dest].rev()],
                             stoprev=min(allsuccessors),
                             inclusive=True)
         for s in allsuccessors:
             if s in ancs:
                 obsoletenotrebased[allsuccessors[s]] = s
             elif (s == allsuccessors[s] and
                   allsuccessors.values().count(s) == 1):
                 # plain prune
                 obsoletenotrebased[s] = None
 
     return obsoletenotrebased
 
 def summaryhook(ui, repo):
     if not repo.vfs.exists('rebasestate'):
         return
     try:
         rbsrt = rebaseruntime(repo, ui, {})
         rbsrt.restorestatus()
         state = rbsrt.state
     except error.RepoLookupError:
         # i18n: column positioning for "hg summary"
         msg = _('rebase: (use "hg rebase --abort" to clear broken state)\n')
         ui.write(msg)
         return
     numrebased = len([i for i in state.itervalues() if i >= 0])
     # i18n: column positioning for "hg summary"
     ui.write(_('rebase: %s, %s (rebase --continue)\n') %
              (ui.label(_('%d rebased'), 'rebase.rebased') % numrebased,
               ui.label(_('%d remaining'), 'rebase.remaining') %
               (len(state) - numrebased)))
 
 def uisetup(ui):
     #Replace pull with a decorator to provide --rebase option
     entry = extensions.wrapcommand(commands.table, 'pull', pullrebase)
     entry[1].append(('', 'rebase', None,
                      _("rebase working directory to branch head")))
     entry[1].append(('t', 'tool', '',
                      _("specify merge tool for rebase")))
     cmdutil.summaryhooks.add('rebase', summaryhook)
     cmdutil.unfinishedstates.append(
         ['rebasestate', False, False, _('rebase in progress'),
          _("use 'hg rebase --continue' or 'hg rebase --abort'")])
     cmdutil.afterresolvedstates.append(
         ['rebasestate', _('hg rebase --continue')])
     # ensure rebased rev are not hidden
     extensions.wrapfunction(repoview, 'pinnedrevs', _rebasedvisible)

mercurial/transaction.py

@@ -1,607 +1,613
 # transaction.py - simple journaling scheme for mercurial
 #
 # This transaction scheme is intended to gracefully handle program
 # errors and interruptions. More serious failures like system crashes
 # can be recovered with an fsck-like tool. As the whole repository is
 # effectively log-structured, this should amount to simply truncating
 # anything that isn't referenced in the changelog.
 #
 # Copyright 2005, 2006 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
 
 from .i18n import _
 from . import (
     error,
     util,
 )
 
 version = 2
 
 # These are the file generators that should only be executed after the
 # finalizers are done, since they rely on the output of the finalizers (like
 # the changelog having been written).
 postfinalizegenerators = {
     'bookmarks',
     'dirstate'
 }
 
 gengroupall='all'
 gengroupprefinalize='prefinalize'
 gengrouppostfinalize='postfinalize'
 
 def active(func):
     def _active(self, *args, **kwds):
         if self.count == 0:
             raise error.Abort(_(
                 'cannot use transaction when it is already committed/aborted'))
         return func(self, *args, **kwds)
     return _active
 
 def _playback(journal, report, opener, vfsmap, entries, backupentries,
               unlink=True):
     for f, o, _ignore in entries:
         if o or not unlink:
             try:
                 fp = opener(f, 'a', checkambig=True)
                 fp.truncate(o)
                 fp.close()
             except IOError:
                 report(_("failed to truncate %s\n") % f)
                 raise
         else:
             try:
                 opener.unlink(f)
             except (IOError, OSError) as inst:
                 if inst.errno != errno.ENOENT:
                     raise
 
     backupfiles = []
     for l, f, b, c in backupentries:
         if l not in vfsmap and c:
             report("couldn't handle %s: unknown cache location %s\n"
                         % (b, l))
         vfs = vfsmap[l]
         try:
             if f and b:
                 filepath = vfs.join(f)
                 backuppath = vfs.join(b)
                 try:
                     util.copyfile(backuppath, filepath, checkambig=True)
                     backupfiles.append(b)
                 except IOError:
                     report(_("failed to recover %s\n") % f)
             else:
                 target = f or b
                 try:
                     vfs.unlink(target)
                 except (IOError, OSError) as inst:
                     if inst.errno != errno.ENOENT:
                         raise
         except (IOError, OSError, error.Abort) as inst:
             if not c:
                 raise
 
     backuppath = "%s.backupfiles" % journal
     if opener.exists(backuppath):
         opener.unlink(backuppath)
     opener.unlink(journal)
     try:
         for f in backupfiles:
             if opener.exists(f):
                 opener.unlink(f)
     except (IOError, OSError, error.Abort) as inst:
         # only pure backup file remains, it is sage to ignore any error
         pass
 
 class transaction(object):
     def __init__(self, report, opener, vfsmap, journalname, undoname=None,
                  after=None, createmode=None, validator=None, releasefn=None):
         """Begin a new transaction
 
         Begins a new transaction that allows rolling back writes in the event of
         an exception.
 
         * `after`: called after the transaction has been committed
         * `createmode`: the mode of the journal file that will be created
         * `releasefn`: called after releasing (with transaction and result)
         """
         self.count = 1
         self.usages = 1
         self.report = report
         # a vfs to the store content
         self.opener = opener
         # a map to access file in various {location -> vfs}
         vfsmap = vfsmap.copy()
         vfsmap[''] = opener  # set default value
         self._vfsmap = vfsmap
         self.after = after
         self.entries = []
         self.map = {}
         self.journal = journalname
         self.undoname = undoname
         self._queue = []
         # A callback to validate transaction content before closing it.
         # should raise exception is anything is wrong.
         # target user is repository hooks.
         if validator is None:
             validator = lambda tr: None
         self.validator = validator
         # A callback to do something just after releasing transaction.
         if releasefn is None:
             releasefn = lambda tr, success: None
         self.releasefn = releasefn
 
         # A dict dedicated to precisely tracking the changes introduced in the
         # transaction.
         self.changes = {}
 
         # a dict of arguments to be passed to hooks
         self.hookargs = {}
         self.file = opener.open(self.journal, "w")
 
         # a list of ('location', 'path', 'backuppath', cache) entries.
         # - if 'backuppath' is empty, no file existed at backup time
         # - if 'path' is empty, this is a temporary transaction file
         # - if 'location' is not empty, the path is outside main opener reach.
         #   use 'location' value as a key in a vfsmap to find the right 'vfs'
         # (cache is currently unused)
         self._backupentries = []
         self._backupmap = {}
         self._backupjournal = "%s.backupfiles" % self.journal
         self._backupsfile = opener.open(self._backupjournal, 'w')
         self._backupsfile.write('%d\n' % version)
 
         if createmode is not None:
             opener.chmod(self.journal, createmode & 0o666)
             opener.chmod(self._backupjournal, createmode & 0o666)
 
         # hold file generations to be performed on commit
         self._filegenerators = {}
         # hold callback to write pending data for hooks
         self._pendingcallback = {}
         # True is any pending data have been written ever
         self._anypending = False
         # holds callback to call when writing the transaction
         self._finalizecallback = {}
         # hold callback for post transaction close
         self._postclosecallback = {}
         # holds callbacks to call during abort
         self._abortcallback = {}
 
     def __del__(self):
         if self.journal:
             self._abort()
 
     @active
     def startgroup(self):
         """delay registration of file entry
 
         This is used by strip to delay vision of strip offset. The transaction
         sees either none or all of the strip actions to be done."""
         self._queue.append([])
 
     @active
     def endgroup(self):
         """apply delayed registration of file entry.
 
         This is used by strip to delay vision of strip offset. The transaction
         sees either none or all of the strip actions to be done."""
         q = self._queue.pop()
         for f, o, data in q:
             self._addentry(f, o, data)
 
     @active
     def add(self, file, offset, data=None):
         """record the state of an append-only file before update"""
         if file in self.map or file in self._backupmap:
             return
         if self._queue:
             self._queue[-1].append((file, offset, data))
             return
 
         self._addentry(file, offset, data)
 
     def _addentry(self, file, offset, data):
         """add a append-only entry to memory and on-disk state"""
         if file in self.map or file in self._backupmap:
             return
         self.entries.append((file, offset, data))
         self.map[file] = len(self.entries) - 1
         # add enough data to the journal to do the truncate
         self.file.write("%s\0%d\n" % (file, offset))
         self.file.flush()
 
     @active
     def addbackup(self, file, hardlink=True, location=''):
         """Adds a backup of the file to the transaction
 
         Calling addbackup() creates a hardlink backup of the specified file
         that is used to recover the file in the event of the transaction
         aborting.
 
         * `file`: the file path, relative to .hg/store
         * `hardlink`: use a hardlink to quickly create the backup
         """
         if self._queue:
             msg = 'cannot use transaction.addbackup inside "group"'
             raise error.ProgrammingError(msg)
 
         if file in self.map or file in self._backupmap:
             return
         vfs = self._vfsmap[location]
         dirname, filename = vfs.split(file)
         backupfilename = "%s.backup.%s" % (self.journal, filename)
         backupfile = vfs.reljoin(dirname, backupfilename)
         if vfs.exists(file):
             filepath = vfs.join(file)
             backuppath = vfs.join(backupfile)
             util.copyfile(filepath, backuppath, hardlink=hardlink)
         else:
             backupfile = ''
 
         self._addbackupentry((location, file, backupfile, False))
 
     def _addbackupentry(self, entry):
         """register a new backup entry and write it to disk"""
         self._backupentries.append(entry)
         self._backupmap[entry[1]] = len(self._backupentries) - 1
         self._backupsfile.write("%s\0%s\0%s\0%d\n" % entry)
         self._backupsfile.flush()
 
     @active
     def registertmp(self, tmpfile, location=''):
         """register a temporary transaction file
 
         Such files will be deleted when the transaction exits (on both
         failure and success).
         """
         self._addbackupentry((location, '', tmpfile, False))
 
     @active
     def addfilegenerator(self, genid, filenames, genfunc, order=0,
                          location=''):
         """add a function to generates some files at transaction commit
 
         The `genfunc` argument is a function capable of generating proper
         content of each entry in the `filename` tuple.
 
         At transaction close time, `genfunc` will be called with one file
         object argument per entries in `filenames`.
 
         The transaction itself is responsible for the backup, creation and
         final write of such file.
 
         The `genid` argument is used to ensure the same set of file is only
         generated once. Call to `addfilegenerator` for a `genid` already
         present will overwrite the old entry.
 
         The `order` argument may be used to control the order in which multiple
         generator will be executed.
 
         The `location` arguments may be used to indicate the files are located
         outside of the the standard directory for transaction. It should match
         one of the key of the `transaction.vfsmap` dictionary.
         """
         # For now, we are unable to do proper backup and restore of custom vfs
         # but for bookmarks that are handled outside this mechanism.
         self._filegenerators[genid] = (order, filenames, genfunc, location)
 
+    @active
+    def removefilegenerator(self, genid):
+        """reverse of addfilegenerator, remove a file generator function"""
+        if genid in self._filegenerators:
+            del self._filegenerators[genid]
+
     def _generatefiles(self, suffix='', group=gengroupall):
         # write files registered for generation
         any = False
         for id, entry in sorted(self._filegenerators.iteritems()):
             any = True
             order, filenames, genfunc, location = entry
 
             # for generation at closing, check if it's before or after finalize
             postfinalize = group == gengrouppostfinalize
             if (group != gengroupall and
                 (id in postfinalizegenerators) != (postfinalize)):
                 continue
 
             vfs = self._vfsmap[location]
             files = []
             try:
                 for name in filenames:
                     name += suffix
                     if suffix:
                         self.registertmp(name, location=location)
                     else:
                         self.addbackup(name, location=location)
                     files.append(vfs(name, 'w', atomictemp=True,
                                      checkambig=not suffix))
                 genfunc(*files)
             finally:
                 for f in files:
                     f.close()
         return any
 
     @active
     def find(self, file):
         if file in self.map:
             return self.entries[self.map[file]]
         if file in self._backupmap:
             return self._backupentries[self._backupmap[file]]
         return None
 
     @active
     def replace(self, file, offset, data=None):
         '''
         replace can only replace already committed entries
         that are not pending in the queue
         '''
 
         if file not in self.map:
             raise KeyError(file)
         index = self.map[file]
         self.entries[index] = (file, offset, data)
         self.file.write("%s\0%d\n" % (file, offset))
         self.file.flush()
 
     @active
     def nest(self):
         self.count += 1
         self.usages += 1
         return self
 
     def release(self):
         if self.count > 0:
             self.usages -= 1
         # if the transaction scopes are left without being closed, fail
         if self.count > 0 and self.usages == 0:
             self._abort()
 
     def __enter__(self):
         return self
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         try:
             if exc_type is None:
                 self.close()
         finally:
             self.release()
 
     def running(self):
         return self.count > 0
 
     def addpending(self, category, callback):
         """add a callback to be called when the transaction is pending
 
         The transaction will be given as callback's first argument.
 
         Category is a unique identifier to allow overwriting an old callback
         with a newer callback.
         """
         self._pendingcallback[category] = callback
 
     @active
     def writepending(self):
         '''write pending file to temporary version
 
         This is used to allow hooks to view a transaction before commit'''
         categories = sorted(self._pendingcallback)
         for cat in categories:
             # remove callback since the data will have been flushed
             any = self._pendingcallback.pop(cat)(self)
             self._anypending = self._anypending or any
         self._anypending |= self._generatefiles(suffix='.pending')
         return self._anypending
 
     @active
     def addfinalize(self, category, callback):
         """add a callback to be called when the transaction is closed
 
         The transaction will be given as callback's first argument.
 
         Category is a unique identifier to allow overwriting old callbacks with
         newer callbacks.
         """
         self._finalizecallback[category] = callback
 
     @active
     def addpostclose(self, category, callback):
         """add a callback to be called after the transaction is closed
 
         The transaction will be given as callback's first argument.
 
         Category is a unique identifier to allow overwriting an old callback
         with a newer callback.
         """
         self._postclosecallback[category] = callback
 
     @active
     def addabort(self, category, callback):
         """add a callback to be called when the transaction is aborted.
 
         The transaction will be given as the first argument to the callback.
 
         Category is a unique identifier to allow overwriting an old callback
         with a newer callback.
         """
         self._abortcallback[category] = callback
 
     @active
     def close(self):
         '''commit the transaction'''
         if self.count == 1:
             self.validator(self)  # will raise exception if needed
             self.validator = None # Help prevent cycles.
             self._generatefiles(group=gengroupprefinalize)
             categories = sorted(self._finalizecallback)
             for cat in categories:
                 self._finalizecallback[cat](self)
             # Prevent double usage and help clear cycles.
             self._finalizecallback = None
             self._generatefiles(group=gengrouppostfinalize)
 
         self.count -= 1
         if self.count != 0:
             return
         self.file.close()
         self._backupsfile.close()
         # cleanup temporary files
         for l, f, b, c in self._backupentries:
             if l not in self._vfsmap and c:
                 self.report("couldn't remove %s: unknown cache location %s\n"
                             % (b, l))
                 continue
             vfs = self._vfsmap[l]
             if not f and b and vfs.exists(b):
                 try:
                     vfs.unlink(b)
                 except (IOError, OSError, error.Abort) as inst:
                     if not c:
                         raise
                     # Abort may be raise by read only opener
                     self.report("couldn't remove %s: %s\n"
                                 % (vfs.join(b), inst))
         self.entries = []
         self._writeundo()
         if self.after:
             self.after()
             self.after = None # Help prevent cycles.
         if self.opener.isfile(self._backupjournal):
             self.opener.unlink(self._backupjournal)
         if self.opener.isfile(self.journal):
             self.opener.unlink(self.journal)
         for l, _f, b, c in self._backupentries:
             if l not in self._vfsmap and c:
                 self.report("couldn't remove %s: unknown cache location"
                             "%s\n" % (b, l))
                 continue
             vfs = self._vfsmap[l]
             if b and vfs.exists(b):
                 try:
                     vfs.unlink(b)
                 except (IOError, OSError, error.Abort) as inst:
                     if not c:
                         raise
                     # Abort may be raise by read only opener
                     self.report("couldn't remove %s: %s\n"
                                 % (vfs.join(b), inst))
         self._backupentries = []
         self.journal = None
 
         self.releasefn(self, True) # notify success of closing transaction
         self.releasefn = None # Help prevent cycles.
 
         # run post close action
         categories = sorted(self._postclosecallback)
         for cat in categories:
             self._postclosecallback[cat](self)
         # Prevent double usage and help clear cycles.
         self._postclosecallback = None
 
     @active
     def abort(self):
         '''abort the transaction (generally called on error, or when the
         transaction is not explicitly committed before going out of
         scope)'''
         self._abort()
 
     def _writeundo(self):
         """write transaction data for possible future undo call"""
         if self.undoname is None:
             return
         undobackupfile = self.opener.open("%s.backupfiles" % self.undoname, 'w')
         undobackupfile.write('%d\n' % version)
         for l, f, b, c in self._backupentries:
             if not f:  # temporary file
                 continue
             if not b:
                 u = ''
             else:
                 if l not in self._vfsmap and c:
                     self.report("couldn't remove %s: unknown cache location"
                                 "%s\n" % (b, l))
                     continue
                 vfs = self._vfsmap[l]
                 base, name = vfs.split(b)
                 assert name.startswith(self.journal), name
                 uname = name.replace(self.journal, self.undoname, 1)
                 u = vfs.reljoin(base, uname)
                 util.copyfile(vfs.join(b), vfs.join(u), hardlink=True)
             undobackupfile.write("%s\0%s\0%s\0%d\n" % (l, f, u, c))
         undobackupfile.close()
 
 
     def _abort(self):
         self.count = 0
         self.usages = 0
         self.file.close()
         self._backupsfile.close()
 
         try:
             if not self.entries and not self._backupentries:
                 if self._backupjournal:
                     self.opener.unlink(self._backupjournal)
                 if self.journal:
                     self.opener.unlink(self.journal)
                 return
 
             self.report(_("transaction abort!\n"))
 
             try:
                 for cat in sorted(self._abortcallback):
                     self._abortcallback[cat](self)
                 # Prevent double usage and help clear cycles.
                 self._abortcallback = None
                 _playback(self.journal, self.report, self.opener, self._vfsmap,
                           self.entries, self._backupentries, False)
                 self.report(_("rollback completed\n"))
             except BaseException:
                 self.report(_("rollback failed - please run hg recover\n"))
         finally:
             self.journal = None
             self.releasefn(self, False) # notify failure of transaction
             self.releasefn = None # Help prevent cycles.
 
 def rollback(opener, vfsmap, file, report):
     """Rolls back the transaction contained in the given file
 
     Reads the entries in the specified file, and the corresponding
     '*.backupfiles' file, to recover from an incomplete transaction.
 
     * `file`: a file containing a list of entries, specifying where
     to truncate each file.  The file should contain a list of
     file\0offset pairs, delimited by newlines. The corresponding
     '*.backupfiles' file should contain a list of file\0backupfile
     pairs, delimited by \0.
     """
     entries = []
     backupentries = []
 
     fp = opener.open(file)
     lines = fp.readlines()
     fp.close()
     for l in lines:
         try:
             f, o = l.split('\0')
             entries.append((f, int(o), None))
         except ValueError:
             report(_("couldn't read journal entry %r!\n") % l)
 
     backupjournal = "%s.backupfiles" % file
     if opener.exists(backupjournal):
         fp = opener.open(backupjournal)
         lines = fp.readlines()
         if lines:
             ver = lines[0][:-1]
             if ver == str(version):
                 for line in lines[1:]:
                     if line:
                         # Shave off the trailing newline
                         line = line[:-1]
                         l, f, b, c = line.split('\0')
                         backupentries.append((l, f, b, bool(c)))
             else:
                 report(_("journal was created by a different version of "
                          "Mercurial\n"))
 
     _playback(file, report, opener, vfsmap, entries, backupentries)

tests/test-rebase-scenario-global.t

@@ -1,957 +1,957
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > rebase=
   > drawdag=$TESTDIR/drawdag.py
   > 
   > [phases]
   > publish=False
   > 
   > [alias]
   > tglog = log -G --template "{rev}: '{desc}' {branches}\n"
   > EOF
 
 
   $ hg init a
   $ cd a
   $ hg unbundle "$TESTDIR/bundles/rebase.hg"
   adding changesets
   adding manifests
   adding file changes
   added 8 changesets with 7 changes to 7 files (+2 heads)
   (run 'hg heads' to see heads, 'hg merge' to merge)
   $ hg up tip
   3 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd ..
 
 
 Rebasing
 D onto H - simple rebase:
 (this also tests that editor is invoked if '--edit' is specified, and that we
 can abort or warn for colliding untracked files)
 
   $ hg clone -q -u . a a1
   $ cd a1
 
   $ hg tglog
   @  7: 'H'
   |
   | o  6: 'G'
   |/|
   o |  5: 'F'
   | |
   | o  4: 'E'
   |/
   | o  3: 'D'
   | |
   | o  2: 'C'
   | |
   | o  1: 'B'
   |/
   o  0: 'A'
   
 
   $ hg status --rev "3^1" --rev 3
   A D
   $ echo collide > D
   $ HGEDITOR=cat hg rebase -s 3 -d 7 --edit --config merge.checkunknown=warn
   rebasing 3:32af7686d403 "D"
   D: replacing untracked file
   D
   
   
   HG: Enter commit message.  Lines beginning with 'HG:' are removed.
   HG: Leave message empty to abort commit.
   HG: --
   HG: user: Nicolas Dumazet <[e-mail]>
   HG: branch 'default'
   HG: added D
   saved backup bundle to $TESTTMP/a1/.hg/strip-backup/32af7686d403-6f7dface-backup.hg (glob)
   $ cat D.orig
   collide
   $ rm D.orig
 
   $ hg tglog
   o  7: 'D'
   |
   @  6: 'H'
   |
   | o  5: 'G'
   |/|
   o |  4: 'F'
   | |
   | o  3: 'E'
   |/
   | o  2: 'C'
   | |
   | o  1: 'B'
   |/
   o  0: 'A'
   
   $ cd ..
 
 
 D onto F - intermediate point:
 (this also tests that editor is not invoked if '--edit' is not specified, and
 that we can ignore for colliding untracked files)
 
   $ hg clone -q -u . a a2
   $ cd a2
   $ echo collide > D
 
   $ HGEDITOR=cat hg rebase -s 3 -d 5 --config merge.checkunknown=ignore
   rebasing 3:32af7686d403 "D"
   saved backup bundle to $TESTTMP/a2/.hg/strip-backup/32af7686d403-6f7dface-backup.hg (glob)
   $ cat D.orig
   collide
   $ rm D.orig
 
   $ hg tglog
   o  7: 'D'
   |
   | @  6: 'H'
   |/
   | o  5: 'G'
   |/|
   o |  4: 'F'
   | |
   | o  3: 'E'
   |/
   | o  2: 'C'
   | |
   | o  1: 'B'
   |/
   o  0: 'A'
   
   $ cd ..
 
 
 E onto H - skip of G:
 (this also tests that we can overwrite untracked files and don't create backups
 if they have the same contents)
 
   $ hg clone -q -u . a a3
   $ cd a3
   $ hg cat -r 4 E | tee E
   E
 
   $ hg rebase -s 4 -d 7
   rebasing 4:9520eea781bc "E"
   rebasing 6:eea13746799a "G"
   note: rebase of 6:eea13746799a created no changes to commit
   saved backup bundle to $TESTTMP/a3/.hg/strip-backup/9520eea781bc-fcd8edd4-backup.hg (glob)
   $ f E.orig
   E.orig: file not found
 
   $ hg tglog
   o  6: 'E'
   |
   @  5: 'H'
   |
   o  4: 'F'
   |
   | o  3: 'D'
   | |
   | o  2: 'C'
   | |
   | o  1: 'B'
   |/
   o  0: 'A'
   
   $ cd ..
 
 
 F onto E - rebase of a branching point (skip G):
 
   $ hg clone -q -u . a a4
   $ cd a4
 
   $ hg rebase -s 5 -d 4
   rebasing 5:24b6387c8c8c "F"
   rebasing 6:eea13746799a "G"
   note: rebase of 6:eea13746799a created no changes to commit
   rebasing 7:02de42196ebe "H" (tip)
   saved backup bundle to $TESTTMP/a4/.hg/strip-backup/24b6387c8c8c-c3fe765d-backup.hg (glob)
 
   $ hg tglog
   @  6: 'H'
   |
   o  5: 'F'
   |
   o  4: 'E'
   |
   | o  3: 'D'
   | |
   | o  2: 'C'
   | |
   | o  1: 'B'
   |/
   o  0: 'A'
   
   $ cd ..
 
 
 G onto H - merged revision having a parent in ancestors of target:
 
   $ hg clone -q -u . a a5
   $ cd a5
 
   $ hg rebase -s 6 -d 7
   rebasing 6:eea13746799a "G"
   saved backup bundle to $TESTTMP/a5/.hg/strip-backup/eea13746799a-883828ed-backup.hg (glob)
 
   $ hg tglog
   o    7: 'G'
   |\
   | @  6: 'H'
   | |
   | o  5: 'F'
   | |
   o |  4: 'E'
   |/
   | o  3: 'D'
   | |
   | o  2: 'C'
   | |
   | o  1: 'B'
   |/
   o  0: 'A'
   
   $ cd ..
 
 
 F onto B - G maintains E as parent:
 
   $ hg clone -q -u . a a6
   $ cd a6
 
   $ hg rebase -s 5 -d 1
   rebasing 5:24b6387c8c8c "F"
   rebasing 6:eea13746799a "G"
   rebasing 7:02de42196ebe "H" (tip)
   saved backup bundle to $TESTTMP/a6/.hg/strip-backup/24b6387c8c8c-c3fe765d-backup.hg (glob)
 
   $ hg tglog
   @  7: 'H'
   |
   | o  6: 'G'
   |/|
   o |  5: 'F'
   | |
   | o  4: 'E'
   | |
   | | o  3: 'D'
   | | |
   +---o  2: 'C'
   | |
   o |  1: 'B'
   |/
   o  0: 'A'
   
   $ cd ..
 
 
 These will fail (using --source):
 
 G onto F - rebase onto an ancestor:
 
   $ hg clone -q -u . a a7
   $ cd a7
 
   $ hg rebase -s 6 -d 5
   nothing to rebase
   [1]
 
 F onto G - rebase onto a descendant:
 
   $ hg rebase -s 5 -d 6
   abort: source is ancestor of destination
   [255]
 
 G onto B - merge revision with both parents not in ancestors of target:
 
   $ hg rebase -s 6 -d 1
   rebasing 6:eea13746799a "G"
   transaction abort!
   rollback completed
   abort: cannot use revision 6 as base, result would have 3 parents
   [255]
   $ hg rebase --abort
   rebase aborted
 
 These will abort gracefully (using --base):
 
 G onto G - rebase onto same changeset:
 
   $ hg rebase -b 6 -d 6
   nothing to rebase - eea13746799a is both "base" and destination
   [1]
 
 G onto F - rebase onto an ancestor:
 
   $ hg rebase -b 6 -d 5
   nothing to rebase
   [1]
 
 F onto G - rebase onto a descendant:
 
   $ hg rebase -b 5 -d 6
   nothing to rebase - "base" 24b6387c8c8c is already an ancestor of destination eea13746799a
   [1]
 
 C onto A - rebase onto an ancestor:
 
   $ hg rebase -d 0 -s 2
   rebasing 2:5fddd98957c8 "C"
   rebasing 3:32af7686d403 "D"
   saved backup bundle to $TESTTMP/a7/.hg/strip-backup/5fddd98957c8-f9244fa1-backup.hg (glob)
   $ hg tglog
   o  7: 'D'
   |
   o  6: 'C'
   |
   | @  5: 'H'
   | |
   | | o  4: 'G'
   | |/|
   | o |  3: 'F'
   |/ /
   | o  2: 'E'
   |/
   | o  1: 'B'
   |/
   o  0: 'A'
   
 
 Check rebasing public changeset
 
   $ hg pull --config phases.publish=True -q -r 6 . # update phase of 6
   $ hg rebase -d 0 -b 6
   nothing to rebase
   [1]
   $ hg rebase -d 5 -b 6
   abort: can't rebase public changeset e1c4361dd923
   (see 'hg help phases' for details)
   [255]
   $ hg rebase -d 5 -r '1 + (6::)'
   abort: can't rebase public changeset e1c4361dd923
   (see 'hg help phases' for details)
   [255]
 
   $ hg rebase -d 5 -b 6 --keep
   rebasing 6:e1c4361dd923 "C"
   rebasing 7:c9659aac0000 "D" (tip)
 
 Check rebasing mutable changeset
 Source phase greater or equal to destination phase: new changeset get the phase of source:
   $ hg id -n
   5
   $ hg rebase -s9 -d0
   rebasing 9:2b23e52411f4 "D" (tip)
   saved backup bundle to $TESTTMP/a7/.hg/strip-backup/2b23e52411f4-f942decf-backup.hg (glob)
   $ hg id -n # check we updated back to parent
   5
   $ hg log --template "{phase}\n" -r 9
   draft
   $ hg rebase -s9 -d1
   rebasing 9:2cb10d0cfc6c "D" (tip)
   saved backup bundle to $TESTTMP/a7/.hg/strip-backup/2cb10d0cfc6c-ddb0f256-backup.hg (glob)
   $ hg log --template "{phase}\n" -r 9
   draft
   $ hg phase --force --secret 9
   $ hg rebase -s9 -d0
   rebasing 9:c5b12b67163a "D" (tip)
   saved backup bundle to $TESTTMP/a7/.hg/strip-backup/c5b12b67163a-4e372053-backup.hg (glob)
   $ hg log --template "{phase}\n" -r 9
   secret
   $ hg rebase -s9 -d1
   rebasing 9:2a0524f868ac "D" (tip)
   saved backup bundle to $TESTTMP/a7/.hg/strip-backup/2a0524f868ac-cefd8574-backup.hg (glob)
   $ hg log --template "{phase}\n" -r 9
   secret
 Source phase lower than destination phase: new changeset get the phase of destination:
   $ hg rebase -s8 -d9
   rebasing 8:6d4f22462821 "C"
   saved backup bundle to $TESTTMP/a7/.hg/strip-backup/6d4f22462821-3441f70b-backup.hg (glob)
   $ hg log --template "{phase}\n" -r 'rev(9)'
   secret
 
   $ cd ..
 
 Test for revset
 
 We need a bit different graph
 All destination are B
 
   $ hg init ah
   $ cd ah
   $ hg unbundle "$TESTDIR/bundles/rebase-revset.hg"
   adding changesets
   adding manifests
   adding file changes
   added 9 changesets with 9 changes to 9 files (+2 heads)
   (run 'hg heads' to see heads, 'hg merge' to merge)
   $ hg tglog
   o  8: 'I'
   |
   o  7: 'H'
   |
   o  6: 'G'
   |
   | o  5: 'F'
   | |
   | o  4: 'E'
   |/
   o  3: 'D'
   |
   o  2: 'C'
   |
   | o  1: 'B'
   |/
   o  0: 'A'
   
   $ cd ..
 
 
 Simple case with keep:
 
 Source on have two descendant heads but ask for one
 
   $ hg clone -q -u . ah ah1
   $ cd ah1
   $ hg rebase -r '2::8' -d 1
   abort: can't remove original changesets with unrebased descendants
   (use --keep to keep original changesets)
   [255]
   $ hg rebase -r '2::8' -d 1 -k
   rebasing 2:c9e50f6cdc55 "C"
   rebasing 3:ffd453c31098 "D"
   rebasing 6:3d8a618087a7 "G"
   rebasing 7:72434a4e60b0 "H"
   rebasing 8:479ddb54a924 "I" (tip)
   $ hg tglog
   o  13: 'I'
   |
   o  12: 'H'
   |
   o  11: 'G'
   |
   o  10: 'D'
   |
   o  9: 'C'
   |
   | o  8: 'I'
   | |
   | o  7: 'H'
   | |
   | o  6: 'G'
   | |
   | | o  5: 'F'
   | | |
   | | o  4: 'E'
   | |/
   | o  3: 'D'
   | |
   | o  2: 'C'
   | |
   o |  1: 'B'
   |/
   o  0: 'A'
   
 
   $ cd ..
 
 Base on have one descendant heads we ask for but common ancestor have two
 
   $ hg clone -q -u . ah ah2
   $ cd ah2
   $ hg rebase -r '3::8' -d 1
   abort: can't remove original changesets with unrebased descendants
   (use --keep to keep original changesets)
   [255]
   $ hg rebase -r '3::8' -d 1 --keep
   rebasing 3:ffd453c31098 "D"
   rebasing 6:3d8a618087a7 "G"
   rebasing 7:72434a4e60b0 "H"
   rebasing 8:479ddb54a924 "I" (tip)
   $ hg tglog
   o  12: 'I'
   |
   o  11: 'H'
   |
   o  10: 'G'
   |
   o  9: 'D'
   |
   | o  8: 'I'
   | |
   | o  7: 'H'
   | |
   | o  6: 'G'
   | |
   | | o  5: 'F'
   | | |
   | | o  4: 'E'
   | |/
   | o  3: 'D'
   | |
   | o  2: 'C'
   | |
   o |  1: 'B'
   |/
   o  0: 'A'
   
 
   $ cd ..
 
 rebase subset
 
   $ hg clone -q -u . ah ah3
   $ cd ah3
   $ hg rebase -r '3::7' -d 1
   abort: can't remove original changesets with unrebased descendants
   (use --keep to keep original changesets)
   [255]
   $ hg rebase -r '3::7' -d 1 --keep
   rebasing 3:ffd453c31098 "D"
   rebasing 6:3d8a618087a7 "G"
   rebasing 7:72434a4e60b0 "H"
   $ hg tglog
   o  11: 'H'
   |
   o  10: 'G'
   |
   o  9: 'D'
   |
   | o  8: 'I'
   | |
   | o  7: 'H'
   | |
   | o  6: 'G'
   | |
   | | o  5: 'F'
   | | |
   | | o  4: 'E'
   | |/
   | o  3: 'D'
   | |
   | o  2: 'C'
   | |
   o |  1: 'B'
   |/
   o  0: 'A'
   
 
   $ cd ..
 
 rebase subset with multiple head
 
   $ hg clone -q -u . ah ah4
   $ cd ah4
   $ hg rebase -r '3::(7+5)' -d 1
   abort: can't remove original changesets with unrebased descendants
   (use --keep to keep original changesets)
   [255]
   $ hg rebase -r '3::(7+5)' -d 1 --keep
   rebasing 3:ffd453c31098 "D"
   rebasing 4:c01897464e7f "E"
   rebasing 5:41bfcc75ed73 "F"
   rebasing 6:3d8a618087a7 "G"
   rebasing 7:72434a4e60b0 "H"
   $ hg tglog
   o  13: 'H'
   |
   o  12: 'G'
   |
   | o  11: 'F'
   | |
   | o  10: 'E'
   |/
   o  9: 'D'
   |
   | o  8: 'I'
   | |
   | o  7: 'H'
   | |
   | o  6: 'G'
   | |
   | | o  5: 'F'
   | | |
   | | o  4: 'E'
   | |/
   | o  3: 'D'
   | |
   | o  2: 'C'
   | |
   o |  1: 'B'
   |/
   o  0: 'A'
   
 
   $ cd ..
 
 More advanced tests
 
 rebase on ancestor with revset
 
   $ hg clone -q -u . ah ah5
   $ cd ah5
   $ hg rebase -r '6::' -d 2
   rebasing 6:3d8a618087a7 "G"
   rebasing 7:72434a4e60b0 "H"
   rebasing 8:479ddb54a924 "I" (tip)
   saved backup bundle to $TESTTMP/ah5/.hg/strip-backup/3d8a618087a7-b4f73f31-backup.hg (glob)
   $ hg tglog
   o  8: 'I'
   |
   o  7: 'H'
   |
   o  6: 'G'
   |
   | o  5: 'F'
   | |
   | o  4: 'E'
   | |
   | o  3: 'D'
   |/
   o  2: 'C'
   |
   | o  1: 'B'
   |/
   o  0: 'A'
   
   $ cd ..
 
 
 rebase with multiple root.
 We rebase E and G on B
 We would expect heads are I, F if it was supported
 
   $ hg clone -q -u . ah ah6
   $ cd ah6
   $ hg rebase -r '(4+6)::' -d 1
   rebasing 4:c01897464e7f "E"
   rebasing 5:41bfcc75ed73 "F"
   rebasing 6:3d8a618087a7 "G"
   rebasing 7:72434a4e60b0 "H"
   rebasing 8:479ddb54a924 "I" (tip)
   saved backup bundle to $TESTTMP/ah6/.hg/strip-backup/3d8a618087a7-aae93a24-backup.hg (glob)
   $ hg tglog
   o  8: 'I'
   |
   o  7: 'H'
   |
   o  6: 'G'
   |
   | o  5: 'F'
   | |
   | o  4: 'E'
   |/
   | o  3: 'D'
   | |
   | o  2: 'C'
   | |
   o |  1: 'B'
   |/
   o  0: 'A'
   
   $ cd ..
 
 More complex rebase with multiple roots
 each root have a different common ancestor with the destination and this is a detach
 
 (setup)
 
   $ hg clone -q -u . a a8
   $ cd a8
   $ echo I > I
   $ hg add I
   $ hg commit -m I
   $ hg up 4
   1 files updated, 0 files merged, 3 files removed, 0 files unresolved
   $ echo I > J
   $ hg add J
   $ hg commit -m J
   created new head
   $ echo I > K
   $ hg add K
   $ hg commit -m K
   $ hg tglog
   @  10: 'K'
   |
   o  9: 'J'
   |
   | o  8: 'I'
   | |
   | o  7: 'H'
   | |
   +---o  6: 'G'
   | |/
   | o  5: 'F'
   | |
   o |  4: 'E'
   |/
   | o  3: 'D'
   | |
   | o  2: 'C'
   | |
   | o  1: 'B'
   |/
   o  0: 'A'
   
 (actual test)
 
   $ hg rebase --dest 'desc(G)' --rev 'desc(K) + desc(I)'
   rebasing 8:e7ec4e813ba6 "I"
   rebasing 10:23a4ace37988 "K" (tip)
   saved backup bundle to $TESTTMP/a8/.hg/strip-backup/23a4ace37988-b06984b3-backup.hg (glob)
   $ hg log --rev 'children(desc(G))'
   changeset:   9:adb617877056
   parent:      6:eea13746799a
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     I
   
   changeset:   10:882431a34a0e
   tag:         tip
   parent:      6:eea13746799a
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     K
   
   $ hg tglog
   @  10: 'K'
   |
   | o  9: 'I'
   |/
   | o  8: 'J'
   | |
   | | o  7: 'H'
   | | |
   o---+  6: 'G'
   |/ /
   | o  5: 'F'
   | |
   o |  4: 'E'
   |/
   | o  3: 'D'
   | |
   | o  2: 'C'
   | |
   | o  1: 'B'
   |/
   o  0: 'A'
   
 
 Test that rebase is not confused by $CWD disappearing during rebase (issue4121)
 
   $ cd ..
   $ hg init cwd-vanish
   $ cd cwd-vanish
   $ touch initial-file
   $ hg add initial-file
   $ hg commit -m 'initial commit'
   $ touch dest-file
   $ hg add dest-file
   $ hg commit -m 'dest commit'
   $ hg up 0
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ touch other-file
   $ hg add other-file
   $ hg commit -m 'first source commit'
   created new head
   $ mkdir subdir
   $ cd subdir
   $ touch subfile
   $ hg add subfile
   $ hg commit -m 'second source with subdir'
 #if rmcwd
   $ hg rebase -b . -d 1 --traceback
   rebasing 2:779a07b1b7a0 "first source commit"
   current directory was removed
   (consider changing to repo root: $TESTTMP/cwd-vanish)
   rebasing 3:a7d6f3a00bf3 "second source with subdir" (tip)
   saved backup bundle to $TESTTMP/cwd-vanish/.hg/strip-backup/779a07b1b7a0-853e0073-backup.hg (glob)
 #else
   $ hg rebase -b . -d 1 --traceback
   rebasing 2:779a07b1b7a0 "first source commit"
   rebasing 3:a7d6f3a00bf3 "second source with subdir" (tip)
   saved backup bundle to $TESTTMP/cwd-vanish/.hg/strip-backup/779a07b1b7a0-853e0073-backup.hg (glob)
 #endif
 
 Get back to the root of cwd-vanish. Note that even though `cd ..`
 works on most systems, it does not work on FreeBSD 10, so we use an
 absolute path to get back to the repository.
   $ cd $TESTTMP
 
 Test that rebase is done in topo order (issue5370)
 
   $ hg init order
   $ cd order
   $ touch a && hg add a && hg ci -m A
   $ touch b && hg add b && hg ci -m B
   $ touch c && hg add c && hg ci -m C
   $ hg up 1
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ touch d && hg add d && hg ci -m D
   created new head
   $ hg up 2
   1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ touch e && hg add e && hg ci -m E
   $ hg up 3
   1 files updated, 0 files merged, 2 files removed, 0 files unresolved
   $ touch f && hg add f && hg ci -m F
   $ hg up 0
   0 files updated, 0 files merged, 3 files removed, 0 files unresolved
   $ touch g && hg add g && hg ci -m G
   created new head
 
   $ hg tglog
   @  6: 'G'
   |
   | o  5: 'F'
   | |
   | | o  4: 'E'
   | | |
   | o |  3: 'D'
   | | |
   | | o  2: 'C'
   | |/
   | o  1: 'B'
   |/
   o  0: 'A'
   
 
   $ hg rebase -s 1 -d 6
   rebasing 1:76035bbd54bd "B"
   rebasing 2:d84f5cfaaf14 "C"
   rebasing 4:82ae8dc7a9b7 "E"
   rebasing 3:ab709c9f7171 "D"
   rebasing 5:412b391de760 "F"
   saved backup bundle to $TESTTMP/order/.hg/strip-backup/76035bbd54bd-e341bc99-backup.hg (glob)
 
   $ hg tglog
   o  6: 'F'
   |
   o  5: 'D'
   |
   | o  4: 'E'
   | |
   | o  3: 'C'
   |/
   o  2: 'B'
   |
   @  1: 'G'
   |
   o  0: 'A'
   
 
 Test experimental revset
 ========================
 
   $ cd ../cwd-vanish
 
 Make the repo a bit more interesting
 
   $ hg up 1
   0 files updated, 0 files merged, 2 files removed, 0 files unresolved
   $ echo aaa > aaa
   $ hg add aaa
   $ hg commit -m aaa
   created new head
   $ hg log -G
   @  changeset:   4:5f7bc9025ed2
   |  tag:         tip
   |  parent:      1:58d79cc1cf43
   |  user:        test
   |  date:        Thu Jan 01 00:00:00 1970 +0000
   |  summary:     aaa
   |
   | o  changeset:   3:1910d5ff34ea
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     second source with subdir
   | |
   | o  changeset:   2:82901330b6ef
   |/   user:        test
   |    date:        Thu Jan 01 00:00:00 1970 +0000
   |    summary:     first source commit
   |
   o  changeset:   1:58d79cc1cf43
   |  user:        test
   |  date:        Thu Jan 01 00:00:00 1970 +0000
   |  summary:     dest commit
   |
   o  changeset:   0:e94b687f7da3
      user:        test
      date:        Thu Jan 01 00:00:00 1970 +0000
      summary:     initial commit
   
 
 Testing from lower head
 
   $ hg up 3
   2 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ hg log -r '_destrebase()'
   changeset:   4:5f7bc9025ed2
   tag:         tip
   parent:      1:58d79cc1cf43
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     aaa
   
 
 Testing from upper head
 
   $ hg log -r '_destrebase(4)'
   changeset:   3:1910d5ff34ea
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     second source with subdir
   
   $ hg up 4
   1 files updated, 0 files merged, 2 files removed, 0 files unresolved
   $ hg log -r '_destrebase()'
   changeset:   3:1910d5ff34ea
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     second source with subdir
   
 Testing rebase being called inside another transaction
 
   $ cd $TESTTMP
   $ hg init tr-state
   $ cd tr-state
   $ cat > $TESTTMP/wraprebase.py <<EOF
   > from __future__ import absolute_import
   > from mercurial import extensions
   > def _rebase(orig, ui, repo, *args, **kwargs):
   >     with repo.wlock():
   >         with repo.lock():
   >             with repo.transaction('wrappedrebase'):
   >                 return orig(ui, repo, *args, **kwargs)
   > def wraprebase(loaded):
   >     assert loaded
   >     rebasemod = extensions.find('rebase')
   >     extensions.wrapcommand(rebasemod.cmdtable, 'rebase', _rebase)
   > def extsetup(ui):
   >     extensions.afterloaded('rebase', wraprebase)
   > EOF
 
   $ cat >> .hg/hgrc <<EOF
   > [extensions]
   > wraprebase=$TESTTMP/wraprebase.py
   > [experimental]
   > evolution=all
   > EOF
 
   $ hg debugdrawdag <<'EOS'
   > B C
   > |/
   > A
   > EOS
 
   $ hg rebase -s C -d B
   rebasing 2:dc0947a82db8 "C" (C tip)
 
   $ [ -f .hg/rebasestate ] && echo 'WRONG: rebasestate should not exist'
-  WRONG: rebasestate should not exist
+  [1]