merge: indent code in batchget()
To make the next patch easier to read.
# merge.py - directory-level update/merge handling for Mercurial
#
# Copyright 2006, 2007 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import
import errno
import os
import shutil
import struct
from .i18n import _
from .node import (
bin,
hex,
nullhex,
nullid,
nullrev,
)
from . import (
copies,
destutil,
error,
filemerge,
obsolete,
scmutil,
subrepo,
util,
worker,
)
_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
The merge state is stored on disk when needed. Two files are used: one with
an old format (version 1), and one with a new format (version 2). Version 2
stores a superset of the data in version 1, including new kinds of records
in the future. For more about the new format, see the documentation for
`_readrecordsv2`.
Each record can contain arbitrary content, and has an associated type. This
`type` should be a letter. If `type` is uppercase, the record is mandatory:
versions of Mercurial that don't support it should abort. If `type` is
lowercase, the record can be safely ignored.
Currently known records:
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
C: a change/delete or delete/change conflict
D: a file that the external merge driver will merge internally
(experimental)
m: the external merge driver defined for this merge plus its run state
(experimental)
f: a (filename, dictonary) tuple of optional values for a given file
X: unsupported mandatory record type (used in tests)
x: unsupported advisory record type (used in tests)
Merge driver run states (experimental):
u: driver-resolved files unmarked -- needs to be run next time we're about
to resolve or commit
m: driver-resolved files marked -- only needs to be run before commit
s: success/skipped -- does not need to be run any more
'''
statepathv1 = 'merge/state'
statepathv2 = 'merge/state2'
@staticmethod
def clean(repo, node=None, other=None):
"""Initialize a brand new merge state, removing any existing state on
disk."""
ms = mergestate(repo)
ms.reset(node, other)
return ms
@staticmethod
def read(repo):
"""Initialize the merge state, reading it from disk."""
ms = mergestate(repo)
ms._read()
return ms
def __init__(self, repo):
"""Initialize the merge state.
Do not use this directly! Instead call read() or clean()."""
self._repo = repo
self._dirty = False
def reset(self, node=None, other=None):
self._state = {}
self._stateextras = {}
self._local = None
self._other = None
for var in ('localctx', 'otherctx'):
if var in vars(self):
delattr(self, var)
if node:
self._local = node
self._other = other
self._readmergedriver = None
if self.mergedriver:
self._mdstate = 's'
else:
self._mdstate = 'u'
shutil.rmtree(self._repo.join('merge'), True)
self._results = {}
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._stateextras = {}
self._local = None
self._other = None
for var in ('localctx', 'otherctx'):
if var in vars(self):
delattr(self, var)
self._readmergedriver = None
self._mdstate = 's'
unsupported = set()
records = self._readrecords()
for rtype, record in records:
if rtype == 'L':
self._local = bin(record)
elif rtype == 'O':
self._other = bin(record)
elif rtype == 'm':
bits = record.split('\0', 1)
mdstate = bits[1]
if len(mdstate) != 1 or mdstate not in 'ums':
# the merge driver should be idempotent, so just rerun it
mdstate = 'u'
self._readmergedriver = bits[0]
self._mdstate = mdstate
elif rtype in 'FDC':
bits = record.split('\0')
self._state[bits[0]] = bits[1:]
elif rtype == 'f':
filename, rawextras = record.split('\0', 1)
extraparts = rawextras.split('\0')
extras = {}
i = 0
while i < len(extraparts):
extras[extraparts[i]] = extraparts[i + 1]
i += 2
self._stateextras[filename] = extras
elif not rtype.islower():
unsupported.add(rtype)
self._results = {}
self._dirty = False
if unsupported:
raise error.UnsupportedMergeRecords(unsupported)
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()
if self._v1v2match(v1records, v2records):
return v2records
else:
# 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
def _v1v2match(self, v1records, v2records):
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:
return False
else:
return True
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
This format is a list of arbitrary records of the form:
[type][length][content]
`type` is a single character, `length` is a 4 byte integer, and
`content` is an arbitrary byte sequence of length `length`.
Mercurial versions prior to 3.7 have a bug where if there are
unsupported mandatory merge records, attempting to clear out the merge
state with hg update --clean or similar aborts. The 't' record type
works around that by writing out what those versions treat as an
advisory record, but later versions interpret as special: the first
character is the 'real' record type and everything onwards is the data.
Returns list of records [(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
if rtype == 't':
rtype, record = record[0], record[1:]
records.append((rtype, record))
f.close()
except IOError as err:
if err.errno != errno.ENOENT:
raise
return records
@util.propertycache
def mergedriver(self):
# protect against the following:
# - A configures a malicious merge driver in their hgrc, then
# pauses the merge
# - A edits their hgrc to remove references to the merge driver
# - A gives a copy of their entire repo, including .hg, to B
# - B inspects .hgrc and finds it to be clean
# - B then continues the merge and the malicious merge driver
# gets invoked
configmergedriver = self._repo.ui.config('experimental', 'mergedriver')
if (self._readmergedriver is not None
and self._readmergedriver != configmergedriver):
raise error.ConfigError(
_("merge driver changed since merge started"),
hint=_("revert merge driver change or abort merge"))
return configmergedriver
@util.propertycache
def localctx(self):
if self._local is None:
raise RuntimeError("localctx accessed but self._local isn't set")
return self._repo[self._local]
@util.propertycache
def otherctx(self):
if self._other is None:
raise RuntimeError("localctx accessed but self._local isn't set")
return self._repo[self._other]
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 = self._makerecords()
self._writerecords(records)
self._dirty = False
def _makerecords(self):
records = []
records.append(('L', hex(self._local)))
records.append(('O', hex(self._other)))
if self.mergedriver:
records.append(('m', '\0'.join([
self.mergedriver, self._mdstate])))
for d, v in self._state.iteritems():
if v[0] == 'd':
records.append(('D', '\0'.join([d] + v)))
# v[1] == local ('cd'), v[6] == other ('dc') -- not supported by
# older versions of Mercurial
elif v[1] == nullhex or v[6] == nullhex:
records.append(('C', '\0'.join([d] + v)))
else:
records.append(('F', '\0'.join([d] + v)))
for filename, extras in sorted(self._stateextras.iteritems()):
rawextras = '\0'.join('%s\0%s' % (k, v) for k, v in
extras.iteritems())
records.append(('f', '%s\0%s' % (filename, rawextras)))
return records
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
See the docstring for _readrecordsv2 for why we use 't'."""
# these are the records that all version 2 clients can read
whitelist = 'LOF'
f = self._repo.vfs(self.statepathv2, 'w')
for key, data in records:
assert len(key) == 1
if key not in whitelist:
key, data = 't', '%s%s' % (key, data)
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.
"""
if fcl.isabsent():
hash = nullhex
else:
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._stateextras[fd] = { 'ancestorlinknode' : hex(fca.node()) }
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 mdstate(self):
return self._mdstate
def unresolved(self):
"""Obtain the paths of unresolved files."""
for f, entry in self._state.items():
if entry[0] == 'u':
yield f
def driverresolved(self):
"""Obtain the paths of driver-resolved files."""
for f, entry in self._state.items():
if entry[0] == 'd':
yield f
def extras(self, filename):
return self._stateextras.setdefault(filename, {})
def _resolve(self, preresolve, dfile, wctx, labels=None):
"""rerun merge process for file path `dfile`"""
if self[dfile] in 'rd':
return True, 0
stateentry = self._state[dfile]
state, hash, lfile, afile, anode, ofile, onode, flags = stateentry
octx = self._repo[self._other]
extras = self.extras(dfile)
anccommitnode = extras.get('ancestorlinknode')
if anccommitnode:
actx = self._repo[anccommitnode]
else:
actx = None
fcd = self._filectxorabsent(hash, wctx, dfile)
fco = self._filectxorabsent(onode, octx, ofile)
# TODO: move this to filectxorabsent
fca = self._repo.filectx(afile, fileid=anode, changeid=actx)
# "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:
if preresolve:
self._repo.ui.warn(
_('warning: cannot merge flags for %s\n') % afile)
elif flags == fla:
flags = flo
if preresolve:
# restore local
if hash != nullhex:
f = self._repo.vfs('merge/' + hash)
self._repo.wwrite(dfile, f.read(), flags)
f.close()
else:
self._repo.wvfs.unlinkpath(dfile, ignoremissing=True)
complete, r, deleted = filemerge.premerge(self._repo, self._local,
lfile, fcd, fco, fca,
labels=labels)
else:
complete, r, deleted = filemerge.filemerge(self._repo, self._local,
lfile, fcd, fco, fca,
labels=labels)
if r is None:
# no real conflict
del self._state[dfile]
self._stateextras.pop(dfile, None)
self._dirty = True
elif not r:
self.mark(dfile, 'r')
if complete:
action = None
if deleted:
if fcd.isabsent():
# dc: local picked. Need to drop if present, which may
# happen on re-resolves.
action = 'f'
else:
# cd: remote picked (or otherwise deleted)
action = 'r'
else:
if fcd.isabsent(): # dc: remote picked
action = 'g'
elif fco.isabsent(): # cd: local picked
if dfile in self.localctx:
action = 'am'
else:
action = 'a'
# else: regular merges (no action necessary)
self._results[dfile] = r, action
return complete, r
def _filectxorabsent(self, hexnode, ctx, f):
if hexnode == nullhex:
return filemerge.absentfilectx(ctx, f)
else:
return ctx[f]
def preresolve(self, dfile, wctx, labels=None):
"""run premerge process for dfile
Returns whether the merge is complete, and the exit code."""
return self._resolve(True, dfile, wctx, labels=labels)
def resolve(self, dfile, wctx, labels=None):
"""run merge process (assuming premerge was run) for dfile
Returns the exit code of the merge."""
return self._resolve(False, dfile, wctx, labels=labels)[1]
def counts(self):
"""return counts for updated, merged and removed files in this
session"""
updated, merged, removed = 0, 0, 0
for r, action in self._results.itervalues():
if r is None:
updated += 1
elif r == 0:
if action == 'r':
removed += 1
else:
merged += 1
return updated, merged, removed
def unresolvedcount(self):
"""get unresolved count for this merge (persistent)"""
return len([True for f, entry in self._state.iteritems()
if entry[0] == 'u'])
def actions(self):
"""return lists of actions to perform on the dirstate"""
actions = {'r': [], 'f': [], 'a': [], 'am': [], 'g': []}
for f, (r, action) in self._results.iteritems():
if action is not None:
actions[action].append((f, None, "merge result"))
return actions
def recordactions(self):
"""record remove/add/get actions in the dirstate"""
branchmerge = self._repo.dirstate.p2() != nullid
recordupdates(self._repo, self.actions(), branchmerge)
def queueremove(self, f):
"""queues a file to be removed from the dirstate
Meant for use by custom merge drivers."""
self._results[f] = 0, 'r'
def queueadd(self, f):
"""queues a file to be added to the dirstate
Meant for use by custom merge drivers."""
self._results[f] = 0, 'a'
def queueget(self, f):
"""queues a file to be marked modified in the dirstate
Meant for use by custom merge drivers."""
self._results[f] = 0, 'g'
def _getcheckunknownconfig(repo, section, name):
config = repo.ui.config(section, name, default='abort')
valid = ['abort', 'ignore', 'warn']
if config not in valid:
validstr = ', '.join(["'" + v + "'" for v in valid])
raise error.ConfigError(_("%s.%s not valid "
"('%s' is none of %s)")
% (section, name, config, validstr))
return config
def _checkunknownfile(repo, wctx, mctx, f, f2=None):
if f2 is None:
f2 = f
return (repo.wvfs.audit.check(f)
and repo.wvfs.isfileorlink(f)
and repo.dirstate.normalize(f) not in repo.dirstate
and mctx[f2].cmp(wctx[f]))
def _checkunknownfiles(repo, wctx, mctx, force, actions, mergeforce):
"""
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.
"""
conflicts = set()
warnconflicts = set()
abortconflicts = set()
unknownconfig = _getcheckunknownconfig(repo, 'merge', 'checkunknown')
ignoredconfig = _getcheckunknownconfig(repo, 'merge', 'checkignored')
if not force:
def collectconflicts(conflicts, config):
if config == 'abort':
abortconflicts.update(conflicts)
elif config == 'warn':
warnconflicts.update(conflicts)
for f, (m, args, msg) in actions.iteritems():
if m in ('c', 'dc'):
if _checkunknownfile(repo, wctx, mctx, f):
conflicts.add(f)
elif m == 'dg':
if _checkunknownfile(repo, wctx, mctx, f, args[0]):
conflicts.add(f)
ignoredconflicts = set([c for c in conflicts
if repo.dirstate._ignore(c)])
unknownconflicts = conflicts - ignoredconflicts
collectconflicts(ignoredconflicts, ignoredconfig)
collectconflicts(unknownconflicts, unknownconfig)
else:
for f, (m, args, msg) in actions.iteritems():
if m == 'cm':
fl2, anc = args
different = _checkunknownfile(repo, wctx, mctx, f)
if repo.dirstate._ignore(f):
config = ignoredconfig
else:
config = unknownconfig
# The behavior when force is True is described by this table:
# config different mergeforce | action backup
# * n * | get n
# * y y | merge -
# abort y n | merge - (1)
# warn y n | warn + get y
# ignore y n | get y
#
# (1) this is probably the wrong behavior here -- we should
# probably abort, but some actions like rebases currently
# don't like an abort happening in the middle of
# merge.update.
if not different:
actions[f] = ('g', (fl2, False), "remote created")
elif mergeforce or config == 'abort':
actions[f] = ('m', (f, f, None, False, anc),
"remote differs from untracked local")
elif config == 'abort':
abortconflicts.add(f)
else:
if config == 'warn':
warnconflicts.add(f)
actions[f] = ('g', (fl2, True), "remote created")
for f in sorted(abortconflicts):
repo.ui.warn(_("%s: untracked file differs\n") % f)
if abortconflicts:
raise error.Abort(_("untracked files in working directory "
"differ from files in requested revision"))
for f in sorted(warnconflicts):
repo.ui.warn(_("%s: replacing untracked file\n") % f)
for f, (m, args, msg) in actions.iteritems():
backup = f in conflicts
if m == 'c':
flags, = args
actions[f] = ('g', (flags, backup), msg)
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', 'am', '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 error.Abort(_("case-folding collision between %s and %s")
% (f, foldmap[fold]))
foldmap[fold] = f
# check case-folding of directories
foldprefix = unfoldprefix = lastfull = ''
for fold, f in sorted(foldmap.items()):
if fold.startswith(foldprefix) and not f.startswith(unfoldprefix):
# the folded prefix matches but actual casing is different
raise error.Abort(_("case-folding collision between "
"%s and directory of %s") % (lastfull, f))
foldprefix = fold + '/'
unfoldprefix = f + '/'
lastfull = f
def driverpreprocess(repo, ms, wctx, labels=None):
"""run the preprocess step of the merge driver, if any
This is currently not implemented -- it's an extension point."""
return True
def driverconclude(repo, ms, wctx, labels=None):
"""run the conclude step of the merge driver, if any
This is currently not implemented -- it's an extension point."""
return True
def manifestmerge(repo, wctx, p2, pa, branchmerge, force, matcher,
acceptremote, followcopies):
"""
Merge p1 and p2 with ancestor pa and generate merge action list
branchmerge and force are as passed in to update
matcher = matcher to filter file lists
acceptremote = accept the incoming changes without prompting
"""
if matcher is not None and matcher.always():
matcher = None
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(matcher)))
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
if matcher is not None:
m1 = m1.matches(matcher)
m2 = m2.matches(matcher)
diff = m1.diff(m2)
actions = {}
for f, ((n1, fl1), (n2, fl2)) in diff.iteritems():
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, False), "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, False), "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', (f, None, f, False, pa.node()),
"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', (None, f, f, False, pa.node()),
"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,
acceptremote, followcopies, matcher=None,
mergeforce=False):
"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, matcher,
acceptremote, followcopies)
_checkunknownfiles(repo, wctx, mctx, force, actions, mergeforce)
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, matcher,
acceptremote, followcopies)
_checkunknownfiles(repo, wctx, mctx, force, actions, mergeforce)
# Track the shortest set of warning on the theory that bid
# merge will correctly incorporate more information
if diverge is None or len(diverge1) < len(diverge):
diverge = diverge1
if renamedelete is None or len(renamedelete) < len(renamedelete1):
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
ui = repo.ui
i = 0
if True:
for f, (flags, backup), msg in actions:
repo.ui.debug(" %s: %s -> g\n" % (f, msg))
if verbose:
repo.ui.note(_("getting %s\n") % f)
if backup:
absf = repo.wjoin(f)
orig = scmutil.origpath(ui, repo, absf)
try:
# TODO Mercurial has always aborted if an untracked
# directory is replaced by a tracked file, or generally
# with file/directory merges. This needs to be sorted out.
if repo.wvfs.isfileorlink(f):
util.rename(absf, orig)
except OSError as e:
if e.errno != errno.ENOENT:
raise
wwrite(f, fctx(f).data(), flags)
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 = 0, 0, 0
ms = mergestate.clean(repo, wctx.p1().node(), mctx.node())
moves = []
for m, l in actions.items():
l.sort()
# 'cd' and 'dc' actions are treated like other merge conflicts
mergeactions = sorted(actions['cd'])
mergeactions.extend(sorted(actions['dc']))
mergeactions.extend(actions['m'])
for f, args, msg in mergeactions:
f1, f2, fa, move, anc = args
if f == '.hgsubstate': # merged internally
continue
if f1 is None:
fcl = filemerge.absentfilectx(wctx, fa)
else:
repo.ui.debug(" preserving %s for resolve of %s\n" % (f1, f))
fcl = wctx[f1]
if f2 is None:
fco = filemerge.absentfilectx(mctx, fa)
else:
fco = mctx[f2]
actx = repo[anc]
if fa in actx:
fca = actx[fa]
else:
# TODO: move to absentfilectx
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)
# re-add/mark as modified (manifest only, just log it)
for f, args, msg in actions['am']:
repo.ui.debug(" %s: %s -> am\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
# 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
# the ordering is important here -- ms.mergedriver will raise if the merge
# driver has changed, and we want to be able to bypass it when overwrite is
# True
usemergedriver = not overwrite and mergeactions and ms.mergedriver
if usemergedriver:
ms.commit()
proceed = driverpreprocess(repo, ms, wctx, labels=labels)
# the driver might leave some files unresolved
unresolvedf = set(ms.unresolved())
if not proceed:
# XXX setting unresolved to at least 1 is a hack to make sure we
# error out
return updated, merged, removed, max(len(unresolvedf), 1)
newactions = []
for f, args, msg in mergeactions:
if f in unresolvedf:
newactions.append((f, args, msg))
mergeactions = newactions
# premerge
tocomplete = []
for f, args, msg in mergeactions:
repo.ui.debug(" %s: %s -> m (premerge)\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)
complete, r = ms.preresolve(f, wctx, labels=labels)
if not complete:
numupdates += 1
tocomplete.append((f, args, msg))
# merge
for f, args, msg in tocomplete:
repo.ui.debug(" %s: %s -> m (merge)\n" % (f, msg))
z += 1
progress(_updating, z, item=f, total=numupdates, unit=_files)
ms.resolve(f, wctx, labels=labels)
ms.commit()
unresolved = ms.unresolvedcount()
if usemergedriver and not unresolved and ms.mdstate() != 's':
if not driverconclude(repo, ms, wctx, labels=labels):
# XXX setting unresolved to at least 1 is a hack to make sure we
# error out
unresolved = max(unresolved, 1)
ms.commit()
msupdated, msmerged, msremoved = ms.counts()
updated += msupdated
merged += msmerged
removed += msremoved
extraactions = ms.actions()
for k, acts in extraactions.iteritems():
actions[k].extend(acts)
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.get('r', []):
if branchmerge:
repo.dirstate.remove(f)
else:
repo.dirstate.drop(f)
# forget (must come first)
for f, args, msg in actions.get('f', []):
repo.dirstate.drop(f)
# re-add
for f, args, msg in actions.get('a', []):
repo.dirstate.add(f)
# re-add/mark as modified
for f, args, msg in actions.get('am', []):
if branchmerge:
repo.dirstate.normallookup(f)
else:
repo.dirstate.add(f)
# exec change
for f, args, msg in actions.get('e', []):
repo.dirstate.normallookup(f)
# keep
for f, args, msg in actions.get('k', []):
pass
# get
for f, args, msg in actions.get('g', []):
if branchmerge:
repo.dirstate.otherparent(f)
else:
repo.dirstate.normal(f)
# merge
for f, args, msg in actions.get('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.get('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.get('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, ancestor=None,
mergeancestor=False, labels=None, matcher=None, mergeforce=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
matcher = a matcher 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.
labels = labels to use for base, local and other
mergeforce = whether the merge was run with 'merge --force' (deprecated): if
this is True, then 'force' should be True as well.
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 discard discard
y n y * | (4) (4) (4)
y n n * | ok ok ok
y y * * | (5) (5) (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
# If we're doing a partial update, we need to skip updating
# the dirstate, so make a note of any partial-ness to the
# update here.
if matcher is None or matcher.always():
partial = False
else:
partial = True
with repo.wlock():
wc = repo[None]
pl = wc.parents()
p1 = pl[0]
pas = [None]
if ancestor is not None:
pas = [repo[ancestor]]
if node is None:
if (repo.ui.configbool('devel', 'all-warnings')
or repo.ui.configbool('devel', 'oldapi')):
repo.ui.develwarn('update with no target')
rev, _mark, _act = destutil.destupdate(repo)
node = repo[rev].node()
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:
if len(pl) > 1:
raise error.Abort(_("outstanding uncommitted merge"))
ms = mergestate.read(repo)
if list(ms.unresolved()):
raise error.Abort(_("outstanding merge conflicts"))
if branchmerge:
if pas == [p2]:
raise error.Abort(_("merging with a working directory ancestor"
" has no effect"))
elif pas == [p1]:
if not mergeancestor and p1.branch() == p2.branch():
raise error.Abort(_("nothing to merge"),
hint=_("use 'hg update' "
"or check 'hg heads'"))
if not force and (wc.files() or wc.deleted()):
raise error.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 <node> 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 error.Abort(msg, hint=hint)
else: # node is none
msg = _("not a linear update")
hint = _("merge or update --check to force update")
raise error.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, mergeancestor,
followcopies, matcher=matcher, mergeforce=mergeforce)
# Prompt and create actions. Most of this is in the resolve phase
# already, but we can't handle .hgsubstate in filemerge or
# subrepo.submerge yet so we have to keep prompting for it.
if '.hgsubstate' in actionbyfile:
f = '.hgsubstate'
m, args, msg = actionbyfile[f]
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):
actionbyfile[f] = ('r', None, "prompt delete")
elif f in p1:
actionbyfile[f] = ('am', None, "prompt keep")
else:
actionbyfile[f] = ('a', None, "prompt keep")
elif m == 'dc':
f1, f2, fa, move, anc = args
flags = p2[f2].flags()
if repo.ui.promptchoice(
_("remote changed %s which local deleted\n"
"use (c)hanged version or leave (d)eleted?"
"$$ &Changed $$ &Deleted") % f, 0) == 0:
actionbyfile[f] = ('g', (flags, False), "prompt recreating")
else:
del actionbyfile[f]
# Convert to dictionary-of-lists format
actions = dict((m, []) for m in 'a am 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)
# 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)
### 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)
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()
if not partial:
repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3])
return stats
def graft(repo, ctx, pctx, labels, keepparent=False):
"""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 (if keepparent is False) and tries to duplicate any
renames/copies appropriately.
ctx - changeset to rebase
pctx - merge base, usually ctx.p1()
labels - merge labels eg ['local', 'graft']
keepparent - keep second parent if any
"""
# 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, pctx.node(),
mergeancestor=mergeancestor, labels=labels)
pother = nullid
parents = ctx.parents()
if keepparent and len(parents) == 2 and pctx in parents:
parents.remove(pctx)
pother = parents[0].node()
repo.dirstate.beginparentchange()
repo.setparents(repo['.'].node(), pother)
repo.dirstate.write(repo.currenttransaction())
# fix up dirstate for copies and renames
copies.duplicatecopies(repo, ctx.rev(), pctx.rev())
repo.dirstate.endparentchange()
return stats