# 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 as errormod, util, filemerge, copies, subrepo, worker 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 = {} self._local = None self._other = None 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 = {} self._local = None self._other = None 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 v2 files and decide which one to use. V1 has been used by version prior to 2.9.1 and contains less data than v2. We read both versions and check if no data in v2 contradicts 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 has overwritten the mergestate 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.vfs(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 as 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.vfs(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 as err: if err.errno != errno.ENOENT: raise return records def active(self): """Whether mergestate is active. Returns True if there appears to be mergestate. This is a rough proxy for "is a merge in progress." """ # Check local variables before looking at filesystem for performance # reasons. return bool(self._local) or bool(self._state) or \ self._repo.vfs.exists(self.statepathv1) or \ self._repo.vfs.exists(self.statepathv2) 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.vfs(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.vfs(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.vfs.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): return iter(sorted(self._state)) def files(self): return self._state.keys() def mark(self, dfile, state): self._state[dfile][0] = state self._dirty = True def unresolved(self): """Obtain the paths of unresolved files.""" for f, entry in self._state.items(): if entry[0] == 'u': yield f def resolve(self, dfile, wctx, labels=None): """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.vfs('merge/' + hash) self._repo.wwrite(dfile, f.read(), flags) f.close() r = filemerge.filemerge(self._repo, self._local, lfile, fcd, fco, fca, labels=labels) 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, f2=None): if f2 is None: f2 = f return (os.path.isfile(repo.wjoin(f)) and repo.wvfs.audit.check(f) and repo.dirstate.normalize(f) not in repo.dirstate and mctx[f2].cmp(wctx[f])) def _checkunknownfiles(repo, wctx, mctx, force, actions): """ Considers any actions that care about the presence of conflicting unknown files. For some actions, the result is to abort; for others, it is to choose a different action. """ aborts = [] if not force: for f, (m, args, msg) in actions.iteritems(): if m in ('c', 'dc'): if _checkunknownfile(repo, wctx, mctx, f): aborts.append(f) elif m == 'dg': if _checkunknownfile(repo, wctx, mctx, f, args[0]): aborts.append(f) for f in sorted(aborts): repo.ui.warn(_("%s: untracked file differs\n") % f) if aborts: raise util.Abort(_("untracked files in working directory differ " "from files in requested revision")) for f, (m, args, msg) in actions.iteritems(): if m == 'c': actions[f] = ('g', args, msg) elif m == 'cm': fl2, anc = args different = _checkunknownfile(repo, wctx, mctx, f) if different: actions[f] = ('m', (f, f, None, False, anc), "remote differs from untracked local") else: actions[f] = ('g', (fl2,), "remote created") 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 = {} m = 'f' if branchmerge: m = 'r' for f in wctx.deleted(): if f not in mctx: actions[f] = m, None, "forget deleted" if not branchmerge: for f in wctx.removed(): if f not in mctx: actions[f] = 'f', None, "forget removed" return actions def _checkcollision(repo, wmf, actions): # build provisional merged manifest up pmmf = set(wmf) if actions: # k, dr, e and rd are no-op for m in 'a', 'f', 'g', 'cd', 'dc': for f, args, msg in actions[m]: pmmf.add(f) for f, args, msg in actions['r']: pmmf.discard(f) for f, args, msg in actions['dm']: f2, flags = args pmmf.discard(f2) pmmf.add(f) for f, args, msg in actions['dg']: pmmf.add(f) for f, args, msg in actions['m']: f1, f2, fa, move, anc = args if move: pmmf.discard(f1) pmmf.add(f) # 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, followcopies): """ 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 """ copy, movewithdir, diverge, renamedelete = {}, {}, {}, {} # 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 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 # Compare manifests diff = m1.diff(m2) actions = {} for f, ((n1, fl1), (n2, fl2)) in diff.iteritems(): if partial and not partial(f): continue if n1 and n2: # file exists on both local and remote side if f not in ma: fa = copy.get(f, None) if fa is not None: actions[f] = ('m', (f, f, fa, False, pa.node()), "both renamed from " + fa) else: actions[f] = ('m', (f, f, None, False, pa.node()), "both created") else: a = ma[f] fla = ma.flags(f) nol = 'l' not in fl1 + fl2 + fla if n2 == a and fl2 == fla: actions[f] = ('k' , (), "remote unchanged") elif n1 == a and fl1 == fla: # local unchanged - use remote if n1 == n2: # optimization: keep local content actions[f] = ('e', (fl2,), "update permissions") else: actions[f] = ('g', (fl2,), "remote is newer") elif nol and n2 == a: # remote only changed 'x' actions[f] = ('e', (fl2,), "update permissions") elif nol and n1 == a: # local only changed 'x' actions[f] = ('g', (fl1,), "remote is newer") else: # both changed something actions[f] = ('m', (f, f, f, False, pa.node()), "versions differ") elif n1: # file exists only on local side if f in copied: pass # we'll deal with it on m2 side elif f in movewithdir: # directory rename, move local f2 = movewithdir[f] if f2 in m2: actions[f2] = ('m', (f, f2, None, True, pa.node()), "remote directory rename, both created") else: actions[f2] = ('dm', (f, fl1), "remote directory rename - move from " + f) elif f in copy: f2 = copy[f] actions[f] = ('m', (f, f2, f2, False, pa.node()), "local copied/moved from " + f2) elif f in ma: # clean, a different, no remote if n1 != ma[f]: if acceptremote: actions[f] = ('r', None, "remote delete") else: actions[f] = ('cd', None, "prompt changed/deleted") elif n1[20:] == 'a': # This extra 'a' is added by working copy manifest to mark # the file as locally added. We should forget it instead of # deleting it. actions[f] = ('f', None, "remote deleted") else: actions[f] = ('r', None, "other deleted") elif n2: # file exists only on remote side if f in copied: pass # we'll deal with it on m1 side elif f in movewithdir: f2 = movewithdir[f] if f2 in m1: actions[f2] = ('m', (f2, f, None, False, pa.node()), "local directory rename, both created") else: actions[f2] = ('dg', (f, fl2), "local directory rename - get from " + f) elif f in copy: f2 = copy[f] if f2 in m2: actions[f] = ('m', (f2, f, f2, False, pa.node()), "remote copied from " + f2) else: actions[f] = ('m', (f2, f, f2, True, pa.node()), "remote moved from " + f2) elif f not in ma: # local unknown, remote created: the logic is described by the # following table: # # force branchmerge different | action # n * * | create # y n * | create # y y n | create # y y y | merge # # Checking whether the files are different is expensive, so we # don't do that when we can avoid it. if not force: actions[f] = ('c', (fl2,), "remote created") elif not branchmerge: actions[f] = ('c', (fl2,), "remote created") else: actions[f] = ('cm', (fl2, pa.node()), "remote created, get or merge") elif n2 != ma[f]: if acceptremote: actions[f] = ('c', (fl2,), "remote recreating") else: actions[f] = ('dc', (fl2,), "prompt deleted/changed") return actions, diverge, renamedelete def _resolvetrivial(repo, wctx, mctx, ancestor, actions): """Resolves false conflicts where the nodeid changed but the content remained the same.""" for f, (m, args, msg) in actions.items(): if m == 'cd' and f in ancestor and not wctx[f].cmp(ancestor[f]): # local did change but ended up with same content actions[f] = 'r', None, "prompt same" elif m == 'dc' and f in ancestor and not mctx[f].cmp(ancestor[f]): # remote did change but ended up with same content del actions[f] # don't get = keep local deleted def calculateupdates(repo, wctx, mctx, ancestors, branchmerge, force, partial, acceptremote, followcopies): "Calculate the actions needed to merge mctx into wctx using ancestors" if len(ancestors) == 1: # default actions, diverge, renamedelete = manifestmerge( repo, wctx, mctx, ancestors[0], branchmerge, force, partial, acceptremote, followcopies) _checkunknownfiles(repo, wctx, mctx, force, actions) else: # only when merge.preferancestor=* - the default repo.ui.note( _("note: merging %s and %s using bids from ancestors %s\n") % (wctx, mctx, _(' and ').join(str(anc) for anc in ancestors))) # Call for bids fbids = {} # mapping filename to bids (action method to list af actions) diverge, renamedelete = None, None for ancestor in ancestors: repo.ui.note(_('\ncalculating bids for ancestor %s\n') % ancestor) actions, diverge1, renamedelete1 = manifestmerge( repo, wctx, mctx, ancestor, branchmerge, force, partial, acceptremote, followcopies) _checkunknownfiles(repo, wctx, mctx, force, actions) if diverge is None: # and renamedelete is None. # Arbitrarily pick warnings from first iteration diverge = diverge1 renamedelete = renamedelete1 for f, a in sorted(actions.iteritems()): m, args, msg = a repo.ui.debug(' %s: %s -> %s\n' % (f, msg, m)) if f in fbids: d = fbids[f] if m in d: d[m].append(a) else: d[m] = [a] else: fbids[f] = {m: [a]} # Pick the best bid for each file repo.ui.note(_('\nauction for merging merge bids\n')) actions = {} for f, bids in sorted(fbids.items()): # bids is a mapping from action method to list af actions # Consensus? if len(bids) == 1: # all bids are the same kind of method m, l = bids.items()[0] if all(a == l[0] for a in l[1:]): # len(bids) is > 1 repo.ui.note(" %s: consensus for %s\n" % (f, m)) actions[f] = l[0] continue # If keep is an option, just do it. if 'k' in bids: repo.ui.note(" %s: picking 'keep' action\n" % f) actions[f] = bids['k'][0] continue # If there are gets and they all agree [how could they not?], do it. if 'g' in bids: ga0 = bids['g'][0] if all(a == ga0 for a in bids['g'][1:]): repo.ui.note(" %s: picking 'get' action\n" % f) actions[f] = ga0 continue # TODO: Consider other simple actions such as mode changes # Handle inefficient democrazy. repo.ui.note(_(' %s: multiple bids for merge action:\n') % f) for m, l in sorted(bids.items()): for _f, args, msg in l: repo.ui.note(' %s -> %s\n' % (msg, m)) # Pick random action. TODO: Instead, prompt user when resolving m, l = bids.items()[0] repo.ui.warn(_(' %s: ambiguous merge - picked %s action\n') % (f, m)) actions[f] = l[0] continue repo.ui.note(_('end of auction\n\n')) _resolvetrivial(repo, wctx, mctx, ancestors[0], actions) if wctx.rev() is None: fractions = _forgetremoved(wctx, mctx, branchmerge) actions.update(fractions) return actions, diverge, renamedelete def batchremove(repo, actions): """apply removes to the working directory yields tuples for progress updates """ verbose = repo.ui.verbose unlink = util.unlinkpath wjoin = repo.wjoin audit = repo.wvfs.audit i = 0 for f, args, msg in actions: repo.ui.debug(" %s: %s -> r\n" % (f, msg)) if verbose: repo.ui.note(_("removing %s\n") % f) audit(f) try: unlink(wjoin(f), ignoremissing=True) except OSError as inst: repo.ui.warn(_("update failed to remove %s: %s!\n") % (f, inst.strerror)) if i == 100: yield i, f i = 0 i += 1 if i > 0: yield i, f def batchget(repo, mctx, actions): """apply gets to the working directory mctx is the context to get from yields tuples for progress updates """ verbose = repo.ui.verbose fctx = mctx.filectx wwrite = repo.wwrite i = 0 for f, args, msg in actions: repo.ui.debug(" %s: %s -> g\n" % (f, msg)) if verbose: repo.ui.note(_("getting %s\n") % f) wwrite(f, fctx(f).data(), args[0]) if i == 100: yield i, f i = 0 i += 1 if i > 0: yield i, f def applyupdates(repo, actions, wctx, mctx, overwrite, labels=None): """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 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 = [] for m, l in actions.items(): l.sort() # prescan for merges for f, args, msg in actions['m']: f1, f2, fa, move, anc = args if f == '.hgsubstate': # merged internally continue repo.ui.debug(" preserving %s for resolve of %s\n" % (f1, f)) fcl = wctx[f1] fco = mctx[f2] actx = repo[anc] if fa in actx: fca = actx[fa] else: fca = repo.filectx(f1, fileid=nullrev) ms.add(fcl, fco, fca, f) if f1 != f and move: moves.append(f1) audit = repo.wvfs.audit _updating = _('updating') _files = _('files') progress = repo.ui.progress # 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 = sum(len(l) for m, l in actions.items() if m != 'k') if [a for a in actions['r'] if a[0] == '.hgsubstate']: subrepo.submerge(repo, wctx, mctx, wctx, overwrite) # remove in parallel (must come first) z = 0 prog = worker.worker(repo.ui, 0.001, batchremove, (repo,), actions['r']) for i, item in prog: z += i progress(_updating, z, item=item, total=numupdates, unit=_files) removed = len(actions['r']) # get in parallel prog = worker.worker(repo.ui, 0.001, batchget, (repo, mctx), actions['g']) for i, item in prog: z += i progress(_updating, z, item=item, total=numupdates, unit=_files) updated = len(actions['g']) if [a for a in actions['g'] if a[0] == '.hgsubstate']: subrepo.submerge(repo, wctx, mctx, wctx, overwrite) # forget (manifest only, just log it) (must come first) for f, args, msg in actions['f']: repo.ui.debug(" %s: %s -> f\n" % (f, msg)) z += 1 progress(_updating, z, item=f, total=numupdates, unit=_files) # re-add (manifest only, just log it) for f, args, msg in actions['a']: repo.ui.debug(" %s: %s -> a\n" % (f, msg)) z += 1 progress(_updating, z, item=f, total=numupdates, unit=_files) # keep (noop, just log it) for f, args, msg in actions['k']: repo.ui.debug(" %s: %s -> k\n" % (f, msg)) # no progress # merge for f, args, msg in actions['m']: repo.ui.debug(" %s: %s -> m\n" % (f, msg)) z += 1 progress(_updating, z, item=f, total=numupdates, unit=_files) if f == '.hgsubstate': # subrepo states need updating subrepo.submerge(repo, wctx, mctx, wctx.ancestor(mctx), overwrite) continue audit(f) r = ms.resolve(f, wctx, labels=labels) if r is not None and r > 0: unresolved += 1 else: if r is None: updated += 1 else: merged += 1 # directory rename, move local for f, args, msg in actions['dm']: repo.ui.debug(" %s: %s -> dm\n" % (f, msg)) z += 1 progress(_updating, z, item=f, total=numupdates, unit=_files) f0, flags = args repo.ui.note(_("moving %s to %s\n") % (f0, f)) audit(f) repo.wwrite(f, wctx.filectx(f0).data(), flags) util.unlinkpath(repo.wjoin(f0)) updated += 1 # local directory rename, get for f, args, msg in actions['dg']: repo.ui.debug(" %s: %s -> dg\n" % (f, msg)) z += 1 progress(_updating, z, item=f, total=numupdates, unit=_files) f0, flags = args repo.ui.note(_("getting %s to %s\n") % (f0, f)) repo.wwrite(f, mctx.filectx(f0).data(), flags) updated += 1 # exec for f, args, msg in actions['e']: repo.ui.debug(" %s: %s -> e\n" % (f, msg)) z += 1 progress(_updating, z, item=f, total=numupdates, unit=_files) 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 recordupdates(repo, actions, branchmerge): "record merge actions to the dirstate" # remove (must come first) for f, args, msg in actions['r']: if branchmerge: repo.dirstate.remove(f) else: repo.dirstate.drop(f) # forget (must come first) for f, args, msg in actions['f']: repo.dirstate.drop(f) # re-add for f, args, msg in actions['a']: if not branchmerge: repo.dirstate.add(f) # exec change for f, args, msg in actions['e']: repo.dirstate.normallookup(f) # keep for f, args, msg in actions['k']: pass # get for f, args, msg in actions['g']: if branchmerge: repo.dirstate.otherparent(f) else: repo.dirstate.normal(f) # merge for f, args, msg in actions['m']: f1, f2, fa, move, anc = 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(f) if f1 != f2: # copy/rename if move: repo.dirstate.remove(f1) if f1 != f: repo.dirstate.copy(f1, f) else: repo.dirstate.copy(f2, f) 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 == f: # file not locally copied/moved repo.dirstate.normallookup(f) if move: repo.dirstate.drop(f1) # directory rename, move local for f, args, msg in actions['dm']: f0, flag = args if branchmerge: repo.dirstate.add(f) repo.dirstate.remove(f0) repo.dirstate.copy(f0, f) else: repo.dirstate.normal(f) repo.dirstate.drop(f0) # directory rename, get for f, args, msg in actions['dg']: f0, flag = args if branchmerge: repo.dirstate.add(f) repo.dirstate.copy(f0, f) else: repo.dirstate.normal(f) def update(repo, node, branchmerge, force, partial, ancestor=None, mergeancestor=False, labels=None): """ 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] pas = [None] if ancestor is not None: pas = [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 errormod.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).first() pas = [p1] overwrite = force and not branchmerge p2 = repo[node] if pas[0] is None: if repo.ui.configlist('merge', 'preferancestor', ['*']) == ['*']: cahs = repo.changelog.commonancestorsheads(p1.node(), p2.node()) pas = [repo[anc] for anc in (sorted(cahs) or [nullid])] else: pas = [p1.ancestor(p2, warn=branchmerge)] 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 merge")) if branchmerge: if pas == [p2]: raise util.Abort(_("merging with a working directory ancestor" " has no effect")) elif pas == [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): wc.sub(s).bailifchanged() 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 pas 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: pas = [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 pas = [p1] # deprecated config: merge.followcopies followcopies = False if overwrite: pas = [wc] elif pas == [p2]: # backwards pas = [wc.p1()] elif not branchmerge and not wc.dirty(missing=True): pass elif pas[0] and repo.ui.configbool('merge', 'followcopies', True): followcopies = True ### calculate phase actionbyfile, diverge, renamedelete = calculateupdates( repo, wc, p2, pas, branchmerge, force, partial, mergeancestor, followcopies) # Convert to dictionary-of-lists format actions = dict((m, []) for m in 'a f g cd dc r dm dg m e k'.split()) for f, (m, args, msg) in actionbyfile.iteritems(): if m not in actions: actions[m] = [] actions[m].append((f, args, msg)) if not util.checkcase(repo.path): # check collision between files only in p2 for clean update if (not branchmerge and (force or not wc.dirty(missing=True, branch=False))): _checkcollision(repo, p2.manifest(), None) else: _checkcollision(repo, wc.manifest(), actions) # Prompt and create actions. TODO: Move this towards resolve phase. for f, args, msg in sorted(actions['cd']): if repo.ui.promptchoice( _("local changed %s which remote deleted\n" "use (c)hanged version or (d)elete?" "$$ &Changed $$ &Delete") % f, 0): actions['r'].append((f, None, "prompt delete")) else: actions['a'].append((f, None, "prompt keep")) del actions['cd'][:] for f, args, msg in sorted(actions['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: actions['g'].append((f, (flags,), "prompt recreating")) del actions['dc'][:] ### 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, overwrite, labels=labels) # divergent renames for f, fl in sorted(diverge.iteritems()): repo.ui.warn(_("note: possible conflict - %s was renamed " "multiple times to:\n") % f) for nf in fl: repo.ui.warn(" %s\n" % nf) # rename and delete for f, fl in sorted(renamedelete.iteritems()): repo.ui.warn(_("note: possible conflict - %s was deleted " "and renamed to:\n") % f) for nf in fl: repo.ui.warn(" %s\n" % nf) if not partial: repo.dirstate.beginparentchange() 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()) repo.dirstate.endparentchange() finally: wlock.release() if not partial: def updatehook(parent1=xp1, parent2=xp2, error=stats[3]): repo.hook('update', parent1=parent1, parent2=parent2, error=error) repo._afterlock(updatehook) return stats def graft(repo, ctx, pctx, labels): """Do a graft-like merge. This is a merge where the merge ancestor is chosen such that one or more changesets are grafted onto the current changeset. In addition to the merge, this fixes up the dirstate to include only a single parent and tries to duplicate any renames/copies appropriately. ctx - changeset to rebase pctx - merge base, usually ctx.p1() labels - merge labels eg ['local', 'graft'] """ # If we're grafting a descendant onto an ancestor, be sure to pass # mergeancestor=True to update. This does two things: 1) allows the merge if # the destination is the same as the parent of the ctx (so we can use graft # to copy commits), and 2) informs update that the incoming changes are # newer than the destination so it doesn't prompt about "remote changed foo # which local deleted". mergeancestor = repo.changelog.isancestor(repo['.'].node(), ctx.node()) stats = update(repo, ctx.node(), True, True, False, pctx.node(), mergeancestor=mergeancestor, labels=labels) # drop the second merge parent repo.dirstate.beginparentchange() repo.setparents(repo['.'].node(), nullid) repo.dirstate.write() # fix up dirstate for copies and renames copies.duplicatecopies(repo, ctx.rev(), pctx.rev()) repo.dirstate.endparentchange() return stats