Mercurial > hg-stable
view hgext/rebase.py @ 33864:d8d0ef5f5975
rebase: remove revprecursor and revpruned states (BC)
Those states are no longer necessary for rebase to function properly. Remove
them to make the code cleaner.
Marked as BC because in a corner case where working parent is obsoleted, and
is skipped for rebase, we no longer move working parent after rebase
completes. That is better since if working parent is obsoleted, it should be
the user moving working parent back there (after a rebase) explicitly, in
that case, we shouldn't move working parent again.
Differential Revision: https://phab.mercurial-scm.org/D24
| author | Jun Wu <quark@fb.com> |
|---|---|
| date | Sat, 08 Jul 2017 20:38:34 -0700 |
| parents | 30573b3d2ebc |
| children | 437e317d7913 |
line wrap: on
line source
# 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, obsutil, 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 # legacy revstates no longer needed in current code # -4: revprecursor, -5: revpruned legacystates = {'-4', '-5'} 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)]) def _ctxdesc(ctx): """short description for a context""" desc = '%d:%s "%s"' % (ctx.rev(), ctx, ctx.description().split('\n', 1)[0]) repo = ctx.repo() names = repo.nodetags(ctx.node()) + repo.nodebookmarks(ctx.node()) if names: desc += ' (%s)' % ' '.join(names) return desc 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.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 legacystates: continue if newrev in (str(nullmerge), str(revignored)): 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) 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.rev()) 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 active bookmarks in order to reset them later 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 = _ctxdesc(ctx) 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.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) 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) editopt = opts.get('edit') editform = 'rebase.collapse' if self.collapsemsg: commitmsg = self.collapsemsg else: commitmsg = 'Collapsed revision' for rebased in sorted(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 = None if ui.configbool('rebase', 'singletransaction'): dsguard = dirstateguard.dirstateguard(repo, 'rebase') with util.acceptintervention(dsguard): newnode = concludenode(repo, revtoreuse, p1, self.external, commitmsg=commitmsg, extrafn=_makeextrafn(self.extrafns), editor=editor, keepbranches=self.keepbranchesf, date=self.date) 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) # restore original working directory # (we do this before stripping) newwd = self.state.get(self.originalwd, self.originalwd) if 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 not self.keepf: collapsedas = None if self.collapsef: collapsedas = newnode clearrebased(ui, repo, self.dest, 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 self.activebookmark in repo._bookmarks 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 By default, rebase will close the transaction after each commit. For performance purposes, you can configure rebase to use a single transaction across the entire rebase. WARNING: This setting introduces a significant risk of losing the work you've done in a rebase if the rebase aborts unexpectedly:: [rebase] singletransaction = 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 tr = None dsguard = None singletr = ui.configbool('rebase', 'singletransaction') if singletr: tr = repo.transaction('rebase') with util.acceptintervention(tr): if singletr: dsguard = dirstateguard.dirstateguard(repo, 'rebase') with util.acceptintervention(dsguard): rbsrt._performrebase(tr) 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.''' dsguard = util.nullcontextmanager() if not repo.ui.configbool('rebase', 'singletransaction'): dsguard = dirstateguard.dirstateguard(repo, 'rebase') with dsguard: 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 adjustdest(repo, rev, dest, state): """adjust rebase destination given the current rebase state rev is what is being rebased. Return a list of two revs, which are the adjusted destinations for rev's p1 and p2, respectively. If a parent is nullrev, return dest without adjustment for it. For example, when doing rebase -r B+E -d F, rebase will first move B to B1, and E's destination will be adjusted from F to B1. B1 <- written during rebasing B | F <- original destination of B, E | | E <- rev, which is being rebased | | | D <- prev, one parent of rev being checked | | | x <- skipped, ex. no successor or successor in (::dest) | | | C | | | B <- rebased as B1 |/ A Another example about merge changeset, rebase -r C+G+H -d K, rebase will first move C to C1, G to G1, and when it's checking H, the adjusted destinations will be [C1, G1]. H C1 G1 /| | / F G |/ K | | -> K | C D | | |/ | | B | ... |/ |/ A A """ result = [] for prev in repo.changelog.parentrevs(rev): adjusted = dest if prev != nullrev: # pick already rebased revs from state source = [s for s, d in state.items() if d > 0] candidate = repo.revs('max(%ld and (::%d))', source, prev).first() if candidate is not None: adjusted = state[candidate] result.append(adjusted) return result 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 successorrevs(repo, rev): """yield revision numbers for successors of rev""" unfi = repo.unfiltered() nodemap = unfi.changelog.nodemap for s in obsutil.allsuccessors(unfi.obsstore, [unfi[rev].node()]): if s in nodemap: yield nodemap[s] def defineparents(repo, rev, dest, state): """Return new parents and optionally a merge base for rev being rebased The destination specified by "dest" cannot always be used directly because previously rebase result could affect destination. For example, D E rebase -r C+D+E -d B |/ C will be rebased to C' B C D's new destination will be C' instead of B |/ E's new destination will be C' instead of B A The new parents of a merge is slightly more complicated. See the comment block below. """ cl = repo.changelog def isancestor(a, b): # take revision numbers instead of nodes if a == b: return True elif a > b: return False return cl.isancestor(cl.node(a), cl.node(b)) oldps = repo.changelog.parentrevs(rev) # old parents newps = [nullrev, nullrev] # new parents dests = adjustdest(repo, rev, dest, state) # adjusted destinations bases = list(oldps) # merge base candidates, initially just old parents if all(r == nullrev for r in oldps[1:]): # For non-merge changeset, just move p to adjusted dest as requested. newps[0] = dests[0] else: # For merge changeset, if we move p to dests[i] unconditionally, both # parents may change and the end result looks like "the merge loses a # parent", which is a surprise. This is a limit because "--dest" only # accepts one dest per src. # # Therefore, only move p with reasonable conditions (in this order): # 1. use dest, if dest is a descendent of (p or one of p's successors) # 2. use p's rebased result, if p is rebased (state[p] > 0) # # Comparing with adjustdest, the logic here does some additional work: # 1. decide which parents will not be moved towards dest # 2. if the above decision is "no", should a parent still be moved # because it was rebased? # # For example: # # C # "rebase -r C -d D" is an error since none of the parents # /| # can be moved. "rebase -r B+C -d D" will move C's parent # A B D # B (using rule "2."), since B will be rebased. # # The loop tries to be not rely on the fact that a Mercurial node has # at most 2 parents. for i, p in enumerate(oldps): np = p # new parent if any(isancestor(x, dests[i]) for x in successorrevs(repo, p)): np = dests[i] elif p in state and state[p] > 0: np = state[p] # "bases" only record "special" merge bases that cannot be # calculated from changelog DAG (i.e. isancestor(p, np) is False). # For example: # # B' # rebase -s B -d D, when B was rebased to B'. dest for C # | C # is B', but merge base for C is B, instead of # D | # changelog.ancestor(C, B') == A. If changelog DAG and # | B # "state" edges are merged (so there will be an edge from # |/ # B to B'), the merge base is still ancestor(C, B') in # A # the merged graph. # # Also see https://bz.mercurial-scm.org/show_bug.cgi?id=1950#c8 # which uses "virtual null merge" to explain this situation. if isancestor(p, np): bases[i] = nullrev # If one parent becomes an ancestor of the other, drop the ancestor for j, x in enumerate(newps[:i]): if x == nullrev: continue if isancestor(np, x): np = nullrev elif isancestor(x, np): newps[j] = np np = nullrev bases[j], bases[i] = bases[i], bases[j] newps[i] = np # "rebasenode" updates to new p1, and the old p1 will be used as merge # base. If only p2 changes, merging using unchanged p1 as merge base is # suboptimal. Therefore swap parents to make the merge sane. if newps[1] != nullrev and oldps[0] == newps[0]: assert len(newps) == 2 and len(oldps) == 2 newps.reverse() bases.reverse() # No parent change might be an error because we fail to make rev a # descendent of requested dest. This can happen, for example: # # C # rebase -r C -d D # /| # None of A and B will be changed to D and rebase fails. # A B D if set(newps) == set(oldps) and dest not in newps: raise error.Abort(_('cannot rebase %d:%s without ' 'moving at least one of its parents') % (rev, repo[rev])) repo.ui.debug(" future parents are %d and %d\n" % tuple(newps)) # "rebasenode" updates to new p1, use the corresponding merge base. if bases[0] != nullrev: base = bases[0] else: base = None # Check if the merge will contain unwanted changes. That may happen if # there are multiple special (non-changelog ancestor) merge bases, which # cannot be handled well by the 3-way merge algorithm. For example: # # F # /| # D E # "rebase -r D+E+F -d Z", when rebasing F, if "D" was chosen # | | # as merge base, the difference between D and F will include # B C # C, so the rebased F will contain C surprisingly. If "E" was # |/ # chosen, the rebased F will contain B. # A Z # # But our merge base candidates (D and E in above case) could still be # better than the default (ancestor(F, Z) == null). Therefore still # pick one (so choose p1 above). if sum(1 for b in bases if b != nullrev) > 1: assert base is not None # Revisions in the side (not chosen as merge base) branch that might # contain "surprising" contents siderevs = list(repo.revs('((%ld-%d) %% (%d+%d))', bases, base, base, dest)) # If those revisions are covered by rebaseset, the result is good. # A merge in rebaseset would be considered to cover its ancestors. if siderevs: rebaseset = [r for r, d in state.items() if d > 0] merges = [r for r in rebaseset if cl.parentrevs(r)[1] != nullrev] unwantedrevs = list(repo.revs('%ld - (::%ld) - %ld', siderevs, merges, rebaseset)) # For revs not covered, it is worth a warning. if unwantedrevs: repo.ui.warn( _('warning: rebasing %d:%s may include unwanted changes ' 'from %s\n') % (rev, repo[rev], ', '.join('%d:%s' % (r, repo[r]) for r in unwantedrevs))) return newps[0], newps[1], 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 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 unfi = repo.unfiltered() for r in obsoletenotrebased: desc = _ctxdesc(unfi[r]) succ = obsoletenotrebased[r] if succ is None: msg = _('note: not rebasing %s, it has no successor\n') % desc del state[r] else: destctx = unfi[succ] destdesc = '%d:%s "%s"' % (destctx.rev(), destctx, destctx.description().split('\n', 1)[0]) msg = (_('note: not rebasing %s, already in destination as %s\n') % (desc, destdesc)) del state[r] repo.ui.status(msg) return originalwd, dest.rev(), state def clearrebased(ui, repo, dest, 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.""" tonode = repo.changelog.node # Move bookmark of skipped nodes to destination. This cannot be handled # by scmutil.cleanupnodes since it will treat rev as removed (no successor) # and move bookmark backwards. bmchanges = [(name, tonode(max(adjustdest(repo, rev, dest, state)))) for rev in skipped for name in repo.nodebookmarks(tonode(rev))] if bmchanges: with repo.transaction('rebase') as tr: repo._bookmarks.applychanges(repo, tr, bmchanges) mapping = {} for rev, newrev in sorted(state.items()): if newrev >= 0 and newrev != rev: if rev in skipped: succs = () elif collapsedas is not None: succs = (collapsedas,) else: succs = (tonode(newrev),) mapping[tonode(rev)] = succs scmutil.cleanupnodes(repo, mapping, 'rebase') 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 obsutil.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([dest], 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)