# merge.py - directory-level update/merge handling for Mercurial # # Copyright 2006, 2007 Matt Mackall # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from node import nullid, nullrev, hex, bin from i18n import _ import error, util, filemerge, copies, subrepo, worker, dicthelpers import errno, os, shutil class mergestate(object): '''track 3-way merge state of individual files''' def __init__(self, repo): self._repo = repo self._dirty = False self._read() def reset(self, node=None): self._state = {} if node: self._local = node shutil.rmtree(self._repo.join("merge"), True) self._dirty = False def _read(self): self._state = {} try: f = self._repo.opener("merge/state") for i, l in enumerate(f): if i == 0: self._local = bin(l[:-1]) else: bits = l[:-1].split("\0") self._state[bits[0]] = bits[1:] f.close() except IOError, err: if err.errno != errno.ENOENT: raise self._dirty = False def commit(self): if self._dirty: f = self._repo.opener("merge/state", "w") f.write(hex(self._local) + "\n") for d, v in self._state.iteritems(): f.write("\0".join([d] + v) + "\n") f.close() self._dirty = False def add(self, fcl, fco, fca, fd): hash = util.sha1(fcl.path()).hexdigest() self._repo.opener.write("merge/" + hash, fcl.data()) self._state[fd] = ['u', hash, fcl.path(), fca.path(), hex(fca.filenode()), fco.path(), fcl.flags()] self._dirty = True def __contains__(self, dfile): return dfile in self._state def __getitem__(self, dfile): return self._state[dfile][0] def __iter__(self): l = self._state.keys() l.sort() for f in l: yield f def mark(self, dfile, state): self._state[dfile][0] = state self._dirty = True def resolve(self, dfile, wctx, octx): if self[dfile] == 'r': return 0 state, hash, lfile, afile, anode, ofile, flags = self._state[dfile] fcd = wctx[dfile] fco = octx[ofile] fca = self._repo.filectx(afile, fileid=anode) # "premerge" x flags flo = fco.flags() fla = fca.flags() if 'x' in flags + flo + fla and 'l' not in flags + flo + fla: if fca.node() == nullid: self._repo.ui.warn(_('warning: cannot merge flags for %s\n') % afile) elif flags == fla: flags = flo # restore local f = self._repo.opener("merge/" + hash) self._repo.wwrite(dfile, f.read(), flags) f.close() r = filemerge.filemerge(self._repo, self._local, lfile, fcd, fco, fca) if r is None: # no real conflict del self._state[dfile] elif not r: self.mark(dfile, 'r') return r def _checkunknownfile(repo, wctx, mctx, f): return (not repo.dirstate._ignore(f) and os.path.isfile(repo.wjoin(f)) and repo.dirstate.normalize(f) not in repo.dirstate and mctx[f].cmp(wctx[f])) def _checkunknown(repo, wctx, mctx): "check for collisions between unknown files and files in mctx" error = False for f in mctx: if f not in wctx and _checkunknownfile(repo, wctx, mctx, f): error = True wctx._repo.ui.warn(_("%s: untracked file differs\n") % f) if error: raise util.Abort(_("untracked files in working directory differ " "from files in requested revision")) def _remains(f, m, ma, workingctx=False): """check whether specified file remains after merge. It is assumed that specified file is not contained in the manifest of the other context. """ if f in ma: n = m[f] if n != ma[f]: return True # because it is changed locally # even though it doesn't remain, if "remote deleted" is # chosen in manifestmerge() elif workingctx and n[20:] == "a": return True # because it is added locally (linear merge specific) else: return False # because it is removed remotely else: return True # because it is added locally def _checkcollision(mctx, extractxs): "check for case folding collisions in the destination context" folded = {} for fn in mctx: fold = util.normcase(fn) if fold in folded: raise util.Abort(_("case-folding collision between %s and %s") % (fn, folded[fold])) folded[fold] = fn if extractxs: wctx, actx = extractxs # class to delay looking up copy mapping class pathcopies(object): @util.propertycache def map(self): # {dst@mctx: src@wctx} copy mapping return copies.pathcopies(wctx, mctx) pc = pathcopies() for fn in wctx: fold = util.normcase(fn) mfn = folded.get(fold, None) if (mfn and mfn != fn and pc.map.get(mfn) != fn and _remains(fn, wctx.manifest(), actx.manifest(), True) and _remains(mfn, mctx.manifest(), actx.manifest())): raise util.Abort(_("case-folding collision between %s and %s") % (mfn, fn)) def _forgetremoved(wctx, mctx, branchmerge): """ Forget removed files If we're jumping between revisions (as opposed to merging), and if neither the working directory nor the target rev has the file, then we need to remove it from the dirstate, to prevent the dirstate from listing the file when it is no longer in the manifest. If we're merging, and the other revision has removed a file that is not present in the working directory, we need to mark it as removed. """ actions = [] state = branchmerge and 'r' or 'f' for f in wctx.deleted(): if f not in mctx: actions.append((f, state, None, "forget deleted")) if not branchmerge: for f in wctx.removed(): if f not in mctx: actions.append((f, "f", None, "forget removed")) return actions def manifestmerge(repo, wctx, p2, pa, branchmerge, force, partial, acceptremote=False): """ Merge p1 and p2 with ancestor pa and generate merge action list branchmerge and force are as passed in to update partial = function to filter file lists acceptremote = accept the incoming changes without prompting """ overwrite = force and not branchmerge actions, copy, movewithdir = [], {}, {} followcopies = False if overwrite: pa = wctx elif pa == p2: # backwards pa = wctx.p1() elif not branchmerge and not wctx.dirty(missing=True): pass elif pa and repo.ui.configbool("merge", "followcopies", True): followcopies = True # manifests fetched in order are going to be faster, so prime the caches [x.manifest() for x in sorted(wctx.parents() + [p2, pa], key=lambda x: x.rev())] if followcopies: ret = copies.mergecopies(repo, wctx, p2, pa) copy, movewithdir, diverge, renamedelete = ret for of, fl in diverge.iteritems(): actions.append((of, "dr", (fl,), "divergent renames")) for of, fl in renamedelete.iteritems(): actions.append((of, "rd", (fl,), "rename and delete")) repo.ui.note(_("resolving manifests\n")) repo.ui.debug(" branchmerge: %s, force: %s, partial: %s\n" % (bool(branchmerge), bool(force), bool(partial))) repo.ui.debug(" ancestor: %s, local: %s, remote: %s\n" % (pa, wctx, p2)) m1, m2, ma = wctx.manifest(), p2.manifest(), pa.manifest() copied = set(copy.values()) copied.update(movewithdir.values()) if '.hgsubstate' in m1: # check whether sub state is modified for s in sorted(wctx.substate): if wctx.sub(s).dirty(): m1['.hgsubstate'] += "+" break aborts, prompts = [], [] # Compare manifests fdiff = dicthelpers.diff(m1, m2) flagsdiff = m1.flagsdiff(m2) diff12 = dicthelpers.join(fdiff, flagsdiff) for f, (n12, fl12) in diff12.iteritems(): if n12: n1, n2 = n12 else: # file contents didn't change, but flags did n1 = n2 = m1[f] if fl12: fl1, fl2 = fl12 else: # flags didn't change, file contents did fl1 = fl2 = m1.flags(f) if partial and not partial(f): continue if n1 and n2: fla = ma.flags(f) nol = 'l' not in fl1 + fl2 + fla a = ma.get(f, nullid) if n2 == a and fl2 == fla: pass # remote unchanged - keep local elif n1 == a and fl1 == fla: # local unchanged - use remote if n1 == n2: # optimization: keep local content actions.append((f, "e", (fl2,), "update permissions")) else: actions.append((f, "g", (fl2,), "remote is newer")) elif nol and n2 == a: # remote only changed 'x' actions.append((f, "e", (fl2,), "update permissions")) elif nol and n1 == a: # local only changed 'x' actions.append((f, "g", (fl1,), "remote is newer")) else: # both changed something actions.append((f, "m", (f, f, False), "versions differ")) elif f in copied: # files we'll deal with on m2 side pass elif n1 and f in movewithdir: # directory rename f2 = movewithdir[f] actions.append((f, "d", (None, f2, fl1), "remote renamed directory to " + f2)) elif n1 and f in copy: f2 = copy[f] actions.append((f, "m", (f2, f, False), "local copied/moved to " + f2)) elif n1 and f in ma: # clean, a different, no remote if n1 != ma[f]: prompts.append((f, "cd")) # prompt changed/deleted elif n1[20:] == "a": # added, no remote actions.append((f, "f", None, "remote deleted")) else: actions.append((f, "r", None, "other deleted")) elif n2 and f in movewithdir: f2 = movewithdir[f] actions.append((None, "d", (f, f2, fl2), "local renamed directory to " + f2)) elif n2 and f in copy: f2 = copy[f] if f2 in m2: actions.append((f2, "m", (f, f, False), "remote copied to " + f)) else: actions.append((f2, "m", (f, f, True), "remote moved to " + f)) elif n2 and f not in ma: # local unknown, remote created: the logic is described by the # following table: # # force branchmerge different | action # n * n | get # n * y | abort # y n * | get # y y n | get # y y y | merge # # Checking whether the files are different is expensive, so we # don't do that when we can avoid it. if force and not branchmerge: actions.append((f, "g", (fl2,), "remote created")) else: different = _checkunknownfile(repo, wctx, p2, f) if force and branchmerge and different: actions.append((f, "m", (f, f, False), "remote differs from untracked local")) elif not force and different: aborts.append((f, "ud")) else: actions.append((f, "g", (fl2,), "remote created")) elif n2 and n2 != ma[f]: prompts.append((f, "dc")) # prompt deleted/changed for f, m in sorted(aborts): if m == "ud": repo.ui.warn(_("%s: untracked file differs\n") % f) else: assert False, m if aborts: raise util.Abort(_("untracked files in working directory differ " "from files in requested revision")) for f, m in sorted(prompts): if m == "cd": if acceptremote: actions.append((f, "r", None, "remote delete")) elif repo.ui.promptchoice( _("local changed %s which remote deleted\n" "use (c)hanged version or (d)elete?") % f, (_("&Changed"), _("&Delete")), 0): actions.append((f, "r", None, "prompt delete")) else: actions.append((f, "a", None, "prompt keep")) elif m == "dc": if acceptremote: actions.append((f, "g", (m2.flags(f),), "remote recreating")) elif repo.ui.promptchoice( _("remote changed %s which local deleted\n" "use (c)hanged version or leave (d)eleted?") % f, (_("&Changed"), _("&Deleted")), 0) == 0: actions.append((f, "g", (m2.flags(f),), "prompt recreating")) else: assert False, m return actions def actionkey(a): return a[1] == "r" and -1 or 0, a def getremove(repo, mctx, overwrite, args): """apply usually-non-interactive updates to the working directory mctx is the context to be merged into the working copy yields tuples for progress updates """ verbose = repo.ui.verbose unlink = util.unlinkpath wjoin = repo.wjoin fctx = mctx.filectx wwrite = repo.wwrite audit = repo.wopener.audit i = 0 for arg in args: f = arg[0] if arg[1] == 'r': if verbose: repo.ui.note(_("removing %s\n") % f) audit(f) try: unlink(wjoin(f), ignoremissing=True) except OSError, inst: repo.ui.warn(_("update failed to remove %s: %s!\n") % (f, inst.strerror)) else: if verbose: repo.ui.note(_("getting %s\n") % f) wwrite(f, fctx(f).data(), arg[2][0]) if i == 100: yield i, f i = 0 i += 1 if i > 0: yield i, f def applyupdates(repo, actions, wctx, mctx, actx, overwrite): """apply the merge action list to the working directory wctx is the working copy context mctx is the context to be merged into the working copy actx is the context of the common ancestor Return a tuple of counts (updated, merged, removed, unresolved) that describes how many files were affected by the update. """ updated, merged, removed, unresolved = 0, 0, 0, 0 ms = mergestate(repo) ms.reset(wctx.p1().node()) moves = [] actions.sort(key=actionkey) # prescan for merges for a in actions: f, m, args, msg = a repo.ui.debug(" %s: %s -> %s\n" % (f, msg, m)) if m == "m": # merge f2, fd, move = args if fd == '.hgsubstate': # merged internally continue repo.ui.debug(" preserving %s for resolve of %s\n" % (f, fd)) fcl = wctx[f] fco = mctx[f2] if mctx == actx: # backwards, use working dir parent as ancestor if fcl.parents(): fca = fcl.p1() else: fca = repo.filectx(f, fileid=nullrev) else: fca = fcl.ancestor(fco, actx) if not fca: fca = repo.filectx(f, fileid=nullrev) ms.add(fcl, fco, fca, fd) if f != fd and move: moves.append(f) audit = repo.wopener.audit # remove renamed files after safely stored for f in moves: if os.path.lexists(repo.wjoin(f)): repo.ui.debug("removing %s\n" % f) audit(f) util.unlinkpath(repo.wjoin(f)) numupdates = len(actions) workeractions = [a for a in actions if a[1] in 'gr'] updated = len([a for a in workeractions if a[1] == 'g']) removed = len([a for a in workeractions if a[1] == 'r']) actions = [a for a in actions if a[1] not in 'gr'] hgsub = [a[1] for a in workeractions if a[0] == '.hgsubstate'] if hgsub and hgsub[0] == 'r': subrepo.submerge(repo, wctx, mctx, wctx, overwrite) z = 0 prog = worker.worker(repo.ui, 0.001, getremove, (repo, mctx, overwrite), workeractions) for i, item in prog: z += i repo.ui.progress(_('updating'), z, item=item, total=numupdates, unit=_('files')) if hgsub and hgsub[0] == 'g': subrepo.submerge(repo, wctx, mctx, wctx, overwrite) _updating = _('updating') _files = _('files') progress = repo.ui.progress for i, a in enumerate(actions): f, m, args, msg = a progress(_updating, z + i + 1, item=f, total=numupdates, unit=_files) if m == "m": # merge f2, fd, move = args if fd == '.hgsubstate': # subrepo states need updating subrepo.submerge(repo, wctx, mctx, wctx.ancestor(mctx), overwrite) continue audit(fd) r = ms.resolve(fd, wctx, mctx) if r is not None and r > 0: unresolved += 1 else: if r is None: updated += 1 else: merged += 1 elif m == "d": # directory rename f2, fd, flags = args if f: repo.ui.note(_("moving %s to %s\n") % (f, fd)) audit(f) repo.wwrite(fd, wctx.filectx(f).data(), flags) util.unlinkpath(repo.wjoin(f)) if f2: repo.ui.note(_("getting %s to %s\n") % (f2, fd)) repo.wwrite(fd, mctx.filectx(f2).data(), flags) updated += 1 elif m == "dr": # divergent renames fl, = args repo.ui.warn(_("note: possible conflict - %s was renamed " "multiple times to:\n") % f) for nf in fl: repo.ui.warn(" %s\n" % nf) elif m == "rd": # rename and delete fl, = args repo.ui.warn(_("note: possible conflict - %s was deleted " "and renamed to:\n") % f) for nf in fl: repo.ui.warn(" %s\n" % nf) elif m == "e": # exec flags, = args audit(f) util.setflags(repo.wjoin(f), 'l' in flags, 'x' in flags) updated += 1 ms.commit() progress(_updating, None, total=numupdates, unit=_files) return updated, merged, removed, unresolved def calculateupdates(repo, tctx, mctx, ancestor, branchmerge, force, partial, acceptremote=False): "Calculate the actions needed to merge mctx into tctx" actions = [] folding = not util.checkcase(repo.path) if folding: # collision check is not needed for clean update if (not branchmerge and (force or not tctx.dirty(missing=True, branch=False))): _checkcollision(mctx, None) else: _checkcollision(mctx, (tctx, ancestor)) actions += manifestmerge(repo, tctx, mctx, ancestor, branchmerge, force, partial, acceptremote) if tctx.rev() is None: actions += _forgetremoved(tctx, mctx, branchmerge) return actions def recordupdates(repo, actions, branchmerge): "record merge actions to the dirstate" for a in actions: f, m, args, msg = a if m == "r": # remove if branchmerge: repo.dirstate.remove(f) else: repo.dirstate.drop(f) elif m == "a": # re-add if not branchmerge: repo.dirstate.add(f) elif m == "f": # forget repo.dirstate.drop(f) elif m == "e": # exec change repo.dirstate.normallookup(f) elif m == "g": # get if branchmerge: repo.dirstate.otherparent(f) else: repo.dirstate.normal(f) elif m == "m": # merge f2, fd, move = args if branchmerge: # We've done a branch merge, mark this file as merged # so that we properly record the merger later repo.dirstate.merge(fd) if f != f2: # copy/rename if move: repo.dirstate.remove(f) if f != fd: repo.dirstate.copy(f, fd) else: repo.dirstate.copy(f2, fd) else: # We've update-merged a locally modified file, so # we set the dirstate to emulate a normal checkout # of that file some time in the past. Thus our # merge will appear as a normal local file # modification. if f2 == fd: # file not locally copied/moved repo.dirstate.normallookup(fd) if move: repo.dirstate.drop(f) elif m == "d": # directory rename f2, fd, flag = args if not f2 and f not in repo.dirstate: # untracked file moved continue if branchmerge: repo.dirstate.add(fd) if f: repo.dirstate.remove(f) repo.dirstate.copy(f, fd) if f2: repo.dirstate.copy(f2, fd) else: repo.dirstate.normal(fd) if f: repo.dirstate.drop(f) def update(repo, node, branchmerge, force, partial, ancestor=None, mergeancestor=False): """ Perform a merge between the working directory and the given node node = the node to update to, or None if unspecified branchmerge = whether to merge between branches force = whether to force branch merging or file overwriting partial = a function to filter file lists (dirstate not updated) mergeancestor = whether it is merging with an ancestor. If true, we should accept the incoming changes for any prompts that occur. If false, merging with an ancestor (fast-forward) is only allowed between different named branches. This flag is used by rebase extension as a temporary fix and should be avoided in general. The table below shows all the behaviors of the update command given the -c and -C or no options, whether the working directory is dirty, whether a revision is specified, and the relationship of the parent rev to the target rev (linear, on the same named branch, or on another named branch). This logic is tested by test-update-branches.t. -c -C dirty rev | linear same cross n n n n | ok (1) x n n n y | ok ok ok n n y * | merge (2) (2) n y * * | --- discard --- y n y * | --- (3) --- y n n * | --- ok --- y y * * | --- (4) --- x = can't happen * = don't-care 1 = abort: crosses branches (use 'hg merge' or 'hg update -c') 2 = abort: crosses branches (use 'hg merge' to merge or use 'hg update -C' to discard changes) 3 = abort: uncommitted local changes 4 = incompatible options (checked in commands.py) Return the same tuple as applyupdates(). """ onode = node wlock = repo.wlock() try: wc = repo[None] if node is None: # tip of current branch try: node = repo.branchtip(wc.branch()) except error.RepoLookupError: if wc.branch() == "default": # no default branch! node = repo.lookup("tip") # update to tip else: raise util.Abort(_("branch %s not found") % wc.branch()) overwrite = force and not branchmerge pl = wc.parents() p1, p2 = pl[0], repo[node] if ancestor: pa = repo[ancestor] else: pa = p1.ancestor(p2) fp1, fp2, xp1, xp2 = p1.node(), p2.node(), str(p1), str(p2) ### check phase if not overwrite and len(pl) > 1: raise util.Abort(_("outstanding uncommitted merges")) if branchmerge: if pa == p2: raise util.Abort(_("merging with a working directory ancestor" " has no effect")) elif pa == p1: if not mergeancestor and p1.branch() == p2.branch(): raise util.Abort(_("nothing to merge"), hint=_("use 'hg update' " "or check 'hg heads'")) if not force and (wc.files() or wc.deleted()): raise util.Abort(_("outstanding uncommitted changes"), hint=_("use 'hg status' to list changes")) for s in sorted(wc.substate): if wc.sub(s).dirty(): raise util.Abort(_("outstanding uncommitted changes in " "subrepository '%s'") % s) elif not overwrite: if pa == p1 or pa == p2: # linear pass # all good elif wc.dirty(missing=True): raise util.Abort(_("crosses branches (merge branches or use" " --clean to discard changes)")) elif onode is None: raise util.Abort(_("crosses branches (merge branches or update" " --check to force update)")) else: # Allow jumping branches if clean and specific rev given pa = p1 ### calculate phase actions = calculateupdates(repo, wc, p2, pa, branchmerge, force, partial, mergeancestor) ### apply phase if not branchmerge: # just jump to the new rev fp1, fp2, xp1, xp2 = fp2, nullid, xp2, '' if not partial: repo.hook('preupdate', throw=True, parent1=xp1, parent2=xp2) stats = applyupdates(repo, actions, wc, p2, pa, overwrite) if not partial: repo.setparents(fp1, fp2) recordupdates(repo, actions, branchmerge) if not branchmerge: repo.dirstate.setbranch(p2.branch()) finally: wlock.release() if not partial: repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3]) return stats