Mercurial > hg
view hgext/rebase.py @ 10777:bdc3256a318e stable
schemes: add Kiln On Demand to default schemes
author | Benjamin Pollack <benjamin@bitquabit.com> |
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date | Wed, 24 Mar 2010 16:42:08 -0400 |
parents | 129e96f7a87a |
children | 68a7b9ed3c71 b5c0f6a11430 |
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# 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: http://mercurial.selenic.com/wiki/RebaseExtension ''' from mercurial import util, repair, merge, cmdutil, commands, error from mercurial import extensions, ancestor, copies, patch from mercurial.commands import templateopts from mercurial.node import nullrev from mercurial.lock import release from mercurial.i18n import _ import os, errno nullmerge = -2 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. If you don't specify a destination changeset (``-d/--dest``), rebase uses the tipmost head of the current named branch as the destination. (The destination changeset is not modified by rebasing, but new changesets are added as its descendants.) You can specify which changesets to rebase in two ways: as a "source" changeset or as a "base" changeset. Both are shorthand for a topologically related set of changesets (the "source branch"). If you specify source (``-s/--source``), rebase will rebase that changeset and all of its descendants onto dest. If you specify base (``-b/--base``), rebase will select ancestors of base back to but not including the common ancestor with dest. Thus, ``-b`` is less precise but more convenient than ``-s``: you can specify any changeset in the source branch, and rebase will select the whole branch. If you specify neither ``-s`` nor ``-b``, rebase uses the parent of the working directory as the base. By default, rebase recreates the changesets in the source branch as descendants of dest and then destroys the originals. Use ``--keep`` to preserve the original source changesets. Some changesets in the source branch (e.g. merges from the destination branch) may be dropped if they no longer contribute any change. One result of the rules for selecting the destination changeset and source branch is that, unlike ``merge``, rebase will do nothing if you are at the latest (tipmost) head of a named branch with two heads. You need to explicitly specify source and/or destination (or ``update`` to the other head, if it's the head of the intended source branch). If a rebase is interrupted to manually resolve a merge, it can be continued with --continue/-c or aborted with --abort/-a. """ originalwd = target = None external = nullrev state = {} skipped = set() targetancestors = set() lock = wlock = None try: lock = repo.lock() wlock = repo.wlock() # Validate input and define rebasing points destf = opts.get('dest', None) srcf = opts.get('source', None) basef = opts.get('base', None) contf = opts.get('continue') abortf = opts.get('abort') collapsef = opts.get('collapse', False) extrafn = opts.get('extrafn') keepf = opts.get('keep', False) keepbranchesf = opts.get('keepbranches', False) detachf = opts.get('detach', False) if contf or abortf: if contf and abortf: raise error.ParseError('rebase', _('cannot use both abort and continue')) if collapsef: raise error.ParseError( 'rebase', _('cannot use collapse with continue or abort')) if detachf: raise error.ParseError( 'rebase', _('cannot use detach with continue or abort')) if srcf or basef or destf: raise error.ParseError('rebase', _('abort and continue do not allow specifying revisions')) (originalwd, target, state, collapsef, keepf, keepbranchesf, external) = restorestatus(repo) if abortf: abort(repo, originalwd, target, state) return else: if srcf and basef: raise error.ParseError('rebase', _('cannot specify both a ' 'revision and a base')) if detachf: if not srcf: raise error.ParseError( 'rebase', _('detach requires a revision to be specified')) if basef: raise error.ParseError( 'rebase', _('cannot specify a base with detach')) cmdutil.bail_if_changed(repo) result = buildstate(repo, destf, srcf, basef, detachf) if not result: # Empty state built, nothing to rebase ui.status(_('nothing to rebase\n')) return else: originalwd, target, state = result if collapsef: targetancestors = set(repo.changelog.ancestors(target)) external = checkexternal(repo, state, targetancestors) if keepbranchesf: if extrafn: raise error.ParseError( 'rebase', _('cannot use both keepbranches and extrafn')) def extrafn(ctx, extra): extra['branch'] = ctx.branch() # Rebase if not targetancestors: targetancestors = set(repo.changelog.ancestors(target)) targetancestors.add(target) for rev in sorted(state): if state[rev] == -1: ui.debug("rebasing %d:%s\n" % (rev, repo[rev])) storestatus(repo, originalwd, target, state, collapsef, keepf, keepbranchesf, external) p1, p2 = defineparents(repo, rev, target, state, targetancestors) if len(repo.parents()) == 2: repo.ui.debug('resuming interrupted rebase\n') else: stats = rebasenode(repo, rev, p1, p2, state) if stats and stats[3] > 0: raise util.Abort(_('fix unresolved conflicts with hg ' 'resolve then run hg rebase --continue')) updatedirstate(repo, rev, target, p2) if not collapsef: newrev = concludenode(repo, rev, p1, p2, extrafn=extrafn) else: # Skip commit if we are collapsing repo.dirstate.setparents(repo[p1].node()) newrev = None # Update the state if newrev is not None: state[rev] = repo[newrev].rev() else: if not collapsef: ui.note(_('no changes, revision %d skipped\n') % rev) ui.debug('next revision set to %s\n' % p1) skipped.add(rev) state[rev] = p1 ui.note(_('rebase merging completed\n')) if collapsef: p1, p2 = defineparents(repo, min(state), target, state, targetancestors) commitmsg = 'Collapsed revision' for rebased in state: if rebased not in skipped and state[rebased] != nullmerge: commitmsg += '\n* %s' % repo[rebased].description() commitmsg = ui.edit(commitmsg, repo.ui.username()) newrev = concludenode(repo, rev, p1, external, commitmsg=commitmsg, extrafn=extrafn) if 'qtip' in repo.tags(): updatemq(repo, state, skipped, **opts) if not keepf: # Remove no more useful revisions rebased = [rev for rev in state if state[rev] != nullmerge] if rebased: if set(repo.changelog.descendants(min(rebased))) - set(state): ui.warn(_("warning: new changesets detected " "on source branch, not stripping\n")) else: repair.strip(ui, repo, repo[min(rebased)].node(), "strip") clearstatus(repo) ui.status(_("rebase completed\n")) if os.path.exists(repo.sjoin('undo')): util.unlink(repo.sjoin('undo')) if skipped: ui.note(_("%d revisions have been skipped\n") % len(skipped)) finally: release(lock, wlock) def rebasemerge(repo, rev, first=False): 'return the correct ancestor' oldancestor = ancestor.ancestor def newancestor(a, b, pfunc): if b == rev: return repo[rev].parents()[0].rev() return oldancestor(a, b, pfunc) if not first: ancestor.ancestor = newancestor else: repo.ui.debug("first revision, do not change ancestor\n") try: stats = merge.update(repo, rev, True, True, False) return stats finally: ancestor.ancestor = oldancestor def checkexternal(repo, state, targetancestors): """Check whether one or more external revisions need to be taken in consideration. In the latter case, abort. """ external = nullrev source = min(state) for rev in state: if rev == source: continue # Check externals and fail if there are more than one for p in repo[rev].parents(): if (p.rev() not in state and p.rev() not in targetancestors): if external != nullrev: raise util.Abort(_('unable to collapse, there is more ' 'than one external parent')) external = p.rev() return external def updatedirstate(repo, rev, p1, p2): """Keep track of renamed files in the revision that is going to be rebased """ # Here we simulate the copies and renames in the source changeset cop, diver = copies.copies(repo, repo[rev], repo[p1], repo[p2], True) m1 = repo[rev].manifest() m2 = repo[p1].manifest() for k, v in cop.iteritems(): if k in m1: if v in m1 or v in m2: repo.dirstate.copy(v, k) if v in m2 and v not in m1: repo.dirstate.remove(v) def concludenode(repo, rev, p1, p2, commitmsg=None, extrafn=None): 'Commit the changes and store useful information in extra' try: repo.dirstate.setparents(repo[p1].node(), repo[p2].node()) if commitmsg is None: commitmsg = repo[rev].description() ctx = repo[rev] extra = {'rebase_source': ctx.hex()} if extrafn: extrafn(ctx, extra) # Commit might fail if unresolved files exist newrev = repo.commit(text=commitmsg, user=ctx.user(), date=ctx.date(), extra=extra) repo.dirstate.setbranch(repo[newrev].branch()) return newrev except util.Abort: # Invalidate the previous setparents repo.dirstate.invalidate() raise def rebasenode(repo, rev, p1, p2, state): 'Rebase a single revision' # Merge phase # Update to target and merge it with local if repo['.'].rev() != repo[p1].rev(): repo.ui.debug(" update to %d:%s\n" % (repo[p1].rev(), repo[p1])) merge.update(repo, p1, False, True, False) else: repo.ui.debug(" already in target\n") repo.dirstate.write() repo.ui.debug(" merge against %d:%s\n" % (repo[rev].rev(), repo[rev])) first = repo[rev].rev() == repo[min(state)].rev() stats = rebasemerge(repo, rev, first) return stats def defineparents(repo, rev, target, state, targetancestors): 'Return the new parent relationship of the revision that will be rebased' parents = repo[rev].parents() p1 = p2 = nullrev P1n = parents[0].rev() if P1n in targetancestors: p1 = target elif P1n in state: if state[P1n] == nullmerge: p1 = target else: p1 = state[P1n] else: # P1n external p1 = target p2 = P1n if len(parents) == 2 and parents[1].rev() not in targetancestors: P2n = parents[1].rev() # interesting second parent if P2n in state: if p1 == target: # P1n in targetancestors or external p1 = state[P2n] else: p2 = state[P2n] else: # P2n external if p2 != nullrev: # P1n external too => rev is a merged revision raise util.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[p1].rev(), repo[p2].rev())) return p1, p2 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 = {} for p in repo.mq.applied: if repo[p.rev].rev() in state: repo.ui.debug('revision %d is an mq patch (%s), finalize it.\n' % (repo[p.rev].rev(), p.name)) mqrebase[repo[p.rev].rev()] = (p.name, isagitpatch(repo, p.name)) if mqrebase: repo.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: repo.ui.debug('import mq patch %d (%s)\n' % (state[rev], mqrebase[rev][0])) repo.mq.qimport(repo, (), patchname=mqrebase[rev][0], git=mqrebase[rev][1],rev=[str(state[rev])]) repo.mq.save_dirty() def storestatus(repo, originalwd, target, state, collapse, keep, keepbranches, external): 'Store the current status to allow recovery' f = repo.opener("rebasestate", "w") f.write(repo[originalwd].hex() + '\n') f.write(repo[target].hex() + '\n') f.write(repo[external].hex() + '\n') f.write('%d\n' % int(collapse)) f.write('%d\n' % int(keep)) f.write('%d\n' % int(keepbranches)) for d, v in state.iteritems(): oldrev = repo[d].hex() newrev = repo[v].hex() f.write("%s:%s\n" % (oldrev, newrev)) f.close() repo.ui.debug('rebase status stored\n') def clearstatus(repo): 'Remove the status files' if os.path.exists(repo.join("rebasestate")): util.unlink(repo.join("rebasestate")) def restorestatus(repo): 'Restore a previously stored status' try: target = None collapse = False external = nullrev state = {} f = repo.opener("rebasestate") for i, l in enumerate(f.read().splitlines()): if i == 0: originalwd = repo[l].rev() elif i == 1: target = 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)) else: oldrev, newrev = l.split(':') state[repo[oldrev].rev()] = repo[newrev].rev() repo.ui.debug('rebase status resumed\n') return originalwd, target, state, collapse, keep, keepbranches, external except IOError, err: if err.errno != errno.ENOENT: raise raise util.Abort(_('no rebase in progress')) def abort(repo, originalwd, target, state): 'Restore the repository to its original state' if set(repo.changelog.descendants(target)) - set(state.values()): repo.ui.warn(_("warning: new changesets detected on target branch, " "not stripping\n")) else: # Strip from the first rebased revision merge.update(repo, repo[originalwd].rev(), False, True, False) rebased = filter(lambda x: x > -1, state.values()) if rebased: strippoint = min(rebased) repair.strip(repo.ui, repo, repo[strippoint].node(), "strip") clearstatus(repo) repo.ui.status(_('rebase aborted\n')) def buildstate(repo, dest, src, base, detach): 'Define which revisions are going to be rebased and where' targetancestors = set() detachset = set() if not dest: # Destination defaults to the latest revision in the current branch branch = repo[None].branch() dest = repo[branch].rev() else: dest = repo[dest].rev() # 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 (repo[dest].hex() in [s.rev for s in repo.mq.applied]): raise util.Abort(_('cannot rebase onto an applied mq patch')) if src: commonbase = repo[src].ancestor(repo[dest]) if commonbase == repo[src]: raise util.Abort(_('source is ancestor of destination')) if commonbase == repo[dest]: raise util.Abort(_('source is descendant of destination')) source = repo[src].rev() if detach: # We need to keep track of source's ancestors up to the common base srcancestors = set(repo.changelog.ancestors(source)) baseancestors = set(repo.changelog.ancestors(commonbase.rev())) detachset = srcancestors - baseancestors detachset.remove(commonbase.rev()) else: if base: cwd = repo[base].rev() else: cwd = repo['.'].rev() if cwd == dest: repo.ui.debug('source and destination are the same\n') return None targetancestors = set(repo.changelog.ancestors(dest)) if cwd in targetancestors: repo.ui.debug('source is ancestor of destination\n') return None cwdancestors = set(repo.changelog.ancestors(cwd)) if dest in cwdancestors: repo.ui.debug('source is descendant of destination\n') return None cwdancestors.add(cwd) rebasingbranch = cwdancestors - targetancestors source = min(rebasingbranch) repo.ui.debug('rebase onto %d starting from %d\n' % (dest, source)) state = dict.fromkeys(repo.changelog.descendants(source), nullrev) state.update(dict.fromkeys(detachset, nullmerge)) state[source] = nullrev return repo['.'].rev(), repo[dest].rev(), state def pullrebase(orig, ui, repo, *args, **opts): 'Call rebase after pull if the latter has been invoked with --rebase' if opts.get('rebase'): if opts.get('update'): del opts['update'] ui.debug('--update and --rebase are not compatible, ignoring ' 'the update flag\n') cmdutil.bail_if_changed(repo) revsprepull = len(repo) orig(ui, repo, *args, **opts) revspostpull = len(repo) if revspostpull > revsprepull: rebase(ui, repo, **opts) branch = repo[None].branch() dest = repo[branch].rev() if dest != repo['.'].rev(): # there was nothing to rebase we force an update merge.update(repo, dest, False, False, False) else: orig(ui, repo, *args, **opts) 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")) ) cmdtable = { "rebase": (rebase, [ ('s', 'source', '', _('rebase from the specified changeset')), ('b', 'base', '', _('rebase from the base of the specified changeset ' '(up to greatest common ancestor of base and dest)')), ('d', 'dest', '', _('rebase onto the specified changeset')), ('', 'collapse', False, _('collapse the rebased changesets')), ('', 'keep', False, _('keep original changesets')), ('', 'keepbranches', False, _('keep original branch names')), ('', 'detach', False, _('force detaching of source from its original ' 'branch')), ('c', 'continue', False, _('continue an interrupted rebase')), ('a', 'abort', False, _('abort an interrupted rebase'))] + templateopts, _('hg rebase [-s REV | -b REV] [-d REV] [options]\n' 'hg rebase {-a|-c}')) }