# 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. import struct from node import nullid, nullrev, hex, bin from i18n import _ from mercurial import obsolete import error, util, filemerge, copies, subrepo, worker, dicthelpers import errno, os, shutil _pack = struct.pack _unpack = struct.unpack def _droponode(data): # used for compatibility for v1 bits = data.split("\0") bits = bits[:-2] + bits[-1:] return "\0".join(bits) class mergestate(object): '''track 3-way merge state of individual files it is stored on disk when needed. Two file are used, one with an old format, one with a new format. Both contains similar data, but the new format can store new kind of field. Current new format is a list of arbitrary record of the form: [type][length][content] Type is a single character, length is a 4 bytes integer, content is an arbitrary suites of bytes of length `length`. Type should be a letter. Capital letter are mandatory record, Mercurial should abort if they are unknown. lower case record can be safely ignored. Currently known record: L: the node of the "local" part of the merge (hexified version) O: the node of the "other" part of the merge (hexified version) F: a file to be merged entry ''' statepathv1 = "merge/state" statepathv2 = "merge/state2" def __init__(self, repo): self._repo = repo self._dirty = False self._read() def reset(self, node=None, other=None): self._state = {} if node: self._local = node self._other = other shutil.rmtree(self._repo.join("merge"), True) self._dirty = False def _read(self): """Analyse each record content to restore a serialized state from disk This function process "record" entry produced by the de-serialization of on disk file. """ self._state = {} records = self._readrecords() for rtype, record in records: if rtype == 'L': self._local = bin(record) elif rtype == 'O': self._other = bin(record) elif rtype == "F": bits = record.split("\0") self._state[bits[0]] = bits[1:] elif not rtype.islower(): raise util.Abort(_('unsupported merge state record: %s') % rtype) self._dirty = False def _readrecords(self): """Read merge state from disk and return a list of record (TYPE, data) We read data from both V1 and Ve files decide which on to use. V1 have been used by version prior to 2.9.1 and contains less data than v2. We read both version and check if no data in v2 contradict one in v1. If there is not contradiction we can safely assume that both v1 and v2 were written at the same time and use the extract data in v2. If there is contradiction we ignore v2 content as we assume an old version of Mercurial have over written the mergstate file and left an old v2 file around. returns list of record [(TYPE, data), ...]""" v1records = self._readrecordsv1() v2records = self._readrecordsv2() oldv2 = set() # old format version of v2 record for rec in v2records: if rec[0] == 'L': oldv2.add(rec) elif rec[0] == 'F': # drop the onode data (not contained in v1) oldv2.add(('F', _droponode(rec[1]))) for rec in v1records: if rec not in oldv2: # v1 file is newer than v2 file, use it # we have to infer the "other" changeset of the merge # we cannot do better than that with v1 of the format mctx = self._repo[None].parents()[-1] v1records.append(('O', mctx.hex())) # add place holder "other" file node information # nobody is using it yet so we do no need to fetch the data # if mctx was wrong `mctx[bits[-2]]` may fails. for idx, r in enumerate(v1records): if r[0] == 'F': bits = r[1].split("\0") bits.insert(-2, '') v1records[idx] = (r[0], "\0".join(bits)) return v1records else: return v2records def _readrecordsv1(self): """read on disk merge state for version 1 file returns list of record [(TYPE, data), ...] Note: the "F" data from this file are one entry short (no "other file node" entry) """ records = [] try: f = self._repo.opener(self.statepathv1) for i, l in enumerate(f): if i == 0: records.append(('L', l[:-1])) else: records.append(('F', l[:-1])) f.close() except IOError, err: if err.errno != errno.ENOENT: raise return records def _readrecordsv2(self): """read on disk merge state for version 2 file returns list of record [(TYPE, data), ...] """ records = [] try: f = self._repo.opener(self.statepathv2) data = f.read() off = 0 end = len(data) while off < end: rtype = data[off] off += 1 length = _unpack('>I', data[off:(off + 4)])[0] off += 4 record = data[off:(off + length)] off += length records.append((rtype, record)) f.close() except IOError, err: if err.errno != errno.ENOENT: raise return records def commit(self): """Write current state on disk (if necessary)""" if self._dirty: records = [] records.append(("L", hex(self._local))) records.append(("O", hex(self._other))) for d, v in self._state.iteritems(): records.append(("F", "\0".join([d] + v))) self._writerecords(records) self._dirty = False def _writerecords(self, records): """Write current state on disk (both v1 and v2)""" self._writerecordsv1(records) self._writerecordsv2(records) def _writerecordsv1(self, records): """Write current state on disk in a version 1 file""" f = self._repo.opener(self.statepathv1, "w") irecords = iter(records) lrecords = irecords.next() assert lrecords[0] == 'L' f.write(hex(self._local) + "\n") for rtype, data in irecords: if rtype == "F": f.write("%s\n" % _droponode(data)) f.close() def _writerecordsv2(self, records): """Write current state on disk in a version 2 file""" f = self._repo.opener(self.statepathv2, "w") for key, data in records: assert len(key) == 1 format = ">sI%is" % len(data) f.write(_pack(format, key, len(data), data)) f.close() def add(self, fcl, fco, fca, fd): """add a new (potentially?) conflicting file the merge state fcl: file context for local, fco: file context for remote, fca: file context for ancestors, fd: file path of the resulting merge. note: also write the local version to the `.hg/merge` directory. """ 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(), hex(fco.filenode()), 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 files(self): return self._state.keys() def mark(self, dfile, state): self._state[dfile][0] = state self._dirty = True def resolve(self, dfile, wctx): """rerun merge process for file path `dfile`""" if self[dfile] == 'r': return 0 stateentry = self._state[dfile] state, hash, lfile, afile, anode, ofile, onode, flags = stateentry octx = self._repo[self._other] 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] self._dirty = True 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.wopener.audit.check(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 _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 _checkcollision(repo, wmf, actions): # build provisional merged manifest up pmmf = set(wmf) def addop(f, args): pmmf.add(f) def removeop(f, args): pmmf.discard(f) def nop(f, args): pass def renameop(f, args): f2, fd, flags = args if f: pmmf.discard(f) pmmf.add(fd) def mergeop(f, args): f2, fd, move = args if move: pmmf.discard(f) pmmf.add(fd) opmap = { "a": addop, "d": renameop, "dr": nop, "e": nop, "f": addop, # untracked file should be kept in working directory "g": addop, "m": mergeop, "r": removeop, "rd": nop, "cd": addop, "dc": addop, } for f, m, args, msg in actions: op = opmap.get(m) assert op, m op(f, args) # check case-folding collision in provisional merged manifest foldmap = {} for f in sorted(pmmf): fold = util.normcase(f) if fold in foldmap: raise util.Abort(_("case-folding collision between %s and %s") % (f, foldmap[fold])) foldmap[fold] = f 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 = [] # 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.get(f, None) if n1 is None: # Since n1 == n2, the file isn't present in m2 either. This # means that the file was removed or deleted locally and # removed remotely, but that residual entries remain in flags. # This can happen in manifests generated by workingctx. continue 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: fa = f a = ma.get(f, nullid) if a == nullid: fa = copy.get(f, f) # Note: f as default is wrong - we can't really make a 3-way # merge without an ancestor file. fla = ma.flags(fa) nol = 'l' not in fl1 + fl2 + fla 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]: if acceptremote: actions.append((f, "r", None, "remote delete")) else: actions.append((f, "cd", None, "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]: different = _checkunknownfile(repo, wctx, p2, f) if not force and different: aborts.append((f, "ud")) else: # if different: old untracked f may be overwritten and lost if acceptremote: actions.append((f, "g", (m2.flags(f),), "remote recreating")) else: actions.append((f, "dc", (m2.flags(f),), "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")) if not util.checkcase(repo.path): # check collision between files only in p2 for clean update if (not branchmerge and (force or not wctx.dirty(missing=True, branch=False))): _checkcollision(repo, m2, []) else: _checkcollision(repo, m1, actions) return actions def actionkey(a): return a[1] in "rf" 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(), mctx.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'] updateactions = [a for a in workeractions if a[1] == 'g'] updated = len(updateactions) removeactions = [a for a in workeractions if a[1] == 'r'] removed = len(removeactions) 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), removeactions) for i, item in prog: z += i repo.ui.progress(_('updating'), z, item=item, total=numupdates, unit=_('files')) prog = worker.worker(repo.ui, 0.001, getremove, (repo, mctx, overwrite), updateactions) 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) 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(fd) 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 = [] actions += manifestmerge(repo, tctx, mctx, ancestor, branchmerge, force, partial, acceptremote) # Filter out prompts. newactions, prompts = [], [] for a in actions: if a[1] in ("cd", "dc"): prompts.append(a) else: newactions.append(a) # Prompt and create actions. TODO: Move this towards resolve phase. for f, m, args, msg in sorted(prompts): if m == "cd": if repo.ui.promptchoice( _("local changed %s which remote deleted\n" "use (c)hanged version or (d)elete?" "$$ &Changed $$ &Delete") % f, 0): newactions.append((f, "r", None, "prompt delete")) else: newactions.append((f, "a", None, "prompt keep")) elif m == "dc": flags, = args if repo.ui.promptchoice( _("remote changed %s which local deleted\n" "use (c)hanged version or leave (d)eleted?" "$$ &Changed $$ &Deleted") % f, 0) == 0: newactions.append((f, "g", (flags,), "prompt recreating")) else: assert False, m if tctx.rev() is None: newactions += _forgetremoved(tctx, mctx, branchmerge) return newactions 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 n | merge (2) (2) n n y y | merge (3) (3) n y * * | --- discard --- y n y * | --- (4) --- y n n * | --- ok --- y y * * | --- (5) --- x = can't happen * = don't-care 1 = abort: not a linear update (merge or update --check to force update) 2 = abort: uncommitted changes (commit and merge, or update --clean to discard changes) 3 = abort: uncommitted changes (commit or update --clean to discard changes) 4 = abort: uncommitted changes (checked in commands.py) 5 = incompatible options (checked in commands.py) Return the same tuple as applyupdates(). """ onode = node wlock = repo.wlock() try: wc = repo[None] pl = wc.parents() p1 = pl[0] pa = None if ancestor: pa = repo[ancestor] if node is None: # Here is where we should consider bookmarks, divergent bookmarks, # foreground changesets (successors), and tip of current branch; # but currently we are only checking the branch tips. 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()) if p1.obsolete() and not p1.children(): # allow updating to successors successors = obsolete.successorssets(repo, p1.node()) # behavior of certain cases is as follows, # # divergent changesets: update to highest rev, similar to what # is currently done when there are more than one head # (i.e. 'tip') # # replaced changesets: same as divergent except we know there # is no conflict # # pruned changeset: no update is done; though, we could # consider updating to the first non-obsolete parent, # similar to what is current done for 'hg prune' if successors: # flatten the list here handles both divergent (len > 1) # and the usual case (len = 1) successors = [n for sub in successors for n in sub] # get the max revision for the given successors set, # i.e. the 'tip' of a set node = repo.revs("max(%ln)", successors)[0] pa = p1 overwrite = force and not branchmerge p2 = repo[node] if pa is None: 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(_("uncommitted changes"), hint=_("use 'hg status' to list changes")) for s in sorted(wc.substate): if wc.sub(s).dirty(): raise util.Abort(_("uncommitted changes in " "subrepository '%s'") % s) elif not overwrite: if p1 == p2: # no-op update # call the hooks and exit early repo.hook('preupdate', throw=True, parent1=xp2, parent2='') repo.hook('update', parent1=xp2, parent2='', error=0) return 0, 0, 0, 0 if pa not in (p1, p2): # nonlinear dirty = wc.dirty(missing=True) if dirty or onode is None: # Branching is a bit strange to ensure we do the minimal # amount of call to obsolete.background. foreground = obsolete.foreground(repo, [p1.node()]) # note: the variable contains a random identifier if repo[node].node() in foreground: pa = p1 # allow updating to successors elif dirty: msg = _("uncommitted changes") if onode is None: hint = _("commit and merge, or update --clean to" " discard changes") else: hint = _("commit or update --clean to discard" " changes") raise util.Abort(msg, hint=hint) else: # node is none msg = _("not a linear update") hint = _("merge or update --check to force update") raise util.Abort(msg, hint=hint) 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) # note that we're in the middle of an update repo.vfs.write('updatestate', p2.hex()) stats = applyupdates(repo, actions, wc, p2, pa, overwrite) if not partial: repo.setparents(fp1, fp2) recordupdates(repo, actions, branchmerge) # update completed, clear state util.unlink(repo.join('updatestate')) 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