# 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, incorporated herein by reference.
from node import nullid, nullrev, hex, bin
from i18n import _
import util, filemerge, copies
import errno, os, shutil
class mergestate(object):
'''track 3-way merge state of individual files'''
def __init__(self, repo):
self._repo = repo
self._read()
def reset(self, node=None):
self._state = {}
if node:
self._local = node
shutil.rmtree(self._repo.join("merge"), True)
def _read(self):
self._state = {}
try:
localnode = None
f = self._repo.opener("merge/state")
for i, l in enumerate(f):
if i == 0:
localnode = l[:-1]
else:
bits = l[:-1].split("\0")
self._state[bits[0]] = bits[1:]
self._local = bin(localnode)
except IOError, err:
if err.errno != errno.ENOENT:
raise
def _write(self):
f = self._repo.opener("merge/state", "w")
f.write(hex(self._local) + "\n")
for d, v in self._state.iteritems():
f.write("\0".join([d] + v) + "\n")
def add(self, fcl, fco, fca, fd, flags):
hash = util.sha1(fcl.path()).hexdigest()
self._repo.opener("merge/" + hash, "w").write(fcl.data())
self._state[fd] = ['u', hash, fcl.path(), fca.path(),
hex(fca.filenode()), fco.path(), flags]
self._write()
def __contains__(self, dfile):
return dfile in self._state
def __getitem__(self, dfile):
return self._state[dfile][0]
def __iter__(self):
l = self._state.keys()
l.sort()
for f in l:
yield f
def mark(self, dfile, state):
self._state[dfile][0] = state
self._write()
def resolve(self, dfile, wctx, octx):
if self[dfile] == 'r':
return 0
state, hash, lfile, afile, anode, ofile, flags = self._state[dfile]
f = self._repo.opener("merge/" + hash)
self._repo.wwrite(dfile, f.read(), flags)
fcd = wctx[dfile]
fco = octx[ofile]
fca = self._repo.filectx(afile, fileid=anode)
r = filemerge.filemerge(self._repo, self._local, lfile, fcd, fco, fca)
if not r:
self.mark(dfile, 'r')
return r
def _checkunknown(wctx, mctx):
"check for collisions between unknown files and files in mctx"
for f in wctx.unknown():
if f in mctx and mctx[f].cmp(wctx[f].data()):
raise util.Abort(_("untracked file in working directory differs"
" from file in requested revision: '%s'") % f)
def _checkcollision(mctx):
"check for case folding collisions in the destination context"
folded = {}
for fn in mctx:
fold = fn.lower()
if fold in folded:
raise util.Abort(_("case-folding collision between %s and %s")
% (fn, folded[fold]))
folded[fold] = fn
def _forgetremoved(wctx, mctx, branchmerge):
"""
Forget removed files
If we're jumping between revisions (as opposed to merging), and if
neither the working directory nor the target rev has the file,
then we need to remove it from the dirstate, to prevent the
dirstate from listing the file when it is no longer in the
manifest.
If we're merging, and the other revision has removed a file
that is not present in the working directory, we need to mark it
as removed.
"""
action = []
state = branchmerge and 'r' or 'f'
for f in wctx.deleted():
if f not in mctx:
action.append((f, state))
if not branchmerge:
for f in wctx.removed():
if f not in mctx:
action.append((f, "f"))
return action
def manifestmerge(repo, p1, p2, pa, overwrite, partial):
"""
Merge p1 and p2 with ancestor ma and generate merge action list
overwrite = whether we clobber working files
partial = function to filter file lists
"""
repo.ui.note(_("resolving manifests\n"))
repo.ui.debug(_(" overwrite %s partial %s\n") % (overwrite, bool(partial)))
repo.ui.debug(_(" ancestor %s local %s remote %s\n") % (pa, p1, p2))
m1 = p1.manifest()
m2 = p2.manifest()
ma = pa.manifest()
backwards = (pa == p2)
action = []
copy, copied, diverge = {}, {}, {}
def fmerge(f, f2=None, fa=None):
"""merge flags"""
if not f2:
f2 = f
fa = f
a, m, n = ma.flags(fa), m1.flags(f), m2.flags(f2)
if m == n: # flags agree
return m # unchanged
if m and n: # flags are set but don't agree
if not a: # both differ from parent
r = repo.ui.prompt(
_(" conflicting flags for %s\n"
"(n)one, e(x)ec or sym(l)ink?") % f,
(_("&None"), _("E&xec"), _("Sym&link")), _("n"))
return r != _("n") and r or ''
if m == a:
return n # changed from m to n
return m # changed from n to m
if m and m != a: # changed from a to m
return m
if n and n != a: # changed from a to n
return n
return '' # flag was cleared
def act(msg, m, f, *args):
repo.ui.debug(" %s: %s -> %s\n" % (f, msg, m))
action.append((f, m) + args)
if pa and not (backwards or overwrite):
if repo.ui.configbool("merge", "followcopies", True):
dirs = repo.ui.configbool("merge", "followdirs", True)
copy, diverge = copies.copies(repo, p1, p2, pa, dirs)
copied = set(copy.values())
for of, fl in diverge.iteritems():
act("divergent renames", "dr", of, fl)
# Compare manifests
for f, n in m1.iteritems():
if partial and not partial(f):
continue
if f in m2:
if overwrite or backwards:
rflags = m2.flags(f)
else:
rflags = fmerge(f)
# are files different?
if n != m2[f]:
a = ma.get(f, nullid)
# are we clobbering?
if overwrite:
act("clobbering", "g", f, rflags)
# or are we going back in time and clean?
elif backwards:
if not n[20:] or not p2[f].cmp(p1[f].data()):
act("reverting", "g", f, rflags)
# are both different from the ancestor?
elif n != a and m2[f] != a:
act("versions differ", "m", f, f, f, rflags, False)
# is remote's version newer?
elif m2[f] != a:
act("remote is newer", "g", f, rflags)
# local is newer, not overwrite, check mode bits
elif m1.flags(f) != rflags:
act("update permissions", "e", f, rflags)
# contents same, check mode bits
elif m1.flags(f) != rflags:
act("update permissions", "e", f, rflags)
elif f in copied:
continue
elif f in copy:
f2 = copy[f]
if f2 not in m2: # directory rename
act("remote renamed directory to " + f2, "d",
f, None, f2, m1.flags(f))
elif f2 in m1: # case 2 A,B/B/B
act("local copied to " + f2, "m",
f, f2, f, fmerge(f, f2, f2), False)
else: # case 4,21 A/B/B
act("local moved to " + f2, "m",
f, f2, f, fmerge(f, f2, f2), False)
elif f in ma:
if n != ma[f] and not overwrite:
if repo.ui.prompt(
_(" local changed %s which remote deleted\n"
"use (c)hanged version or (d)elete?") % f,
(_("&Changed"), _("&Delete")), _("c")) == _("d"):
act("prompt delete", "r", f)
act("prompt keep", "a", f)
else:
act("other deleted", "r", f)
elif overwrite and n[20:] == "a": # do not erase the working copy
act("remote deleted", "f", f)
else:
# file is created on branch or in working directory
if (overwrite and n[20:] != "u") or (backwards and not n[20:]):
act("remote deleted", "r", f)
for f, n in m2.iteritems():
if partial and not partial(f):
continue
if f in m1:
continue
if f in copied:
continue
if f in copy:
f2 = copy[f]
if f2 not in m1: # directory rename
act("local renamed directory to " + f2, "d",
None, f, f2, m2.flags(f))
elif f2 in m2: # rename case 1, A/A,B/A
act("remote copied to " + f, "m",
f2, f, f, fmerge(f2, f, f2), False)
else: # case 3,20 A/B/A
act("remote moved to " + f, "m",
f2, f, f, fmerge(f2, f, f2), True)
elif f in ma:
if overwrite or backwards:
act("recreating", "g", f, m2.flags(f))
elif n != ma[f]:
if repo.ui.prompt(
_("remote changed %s which local deleted\n"
"use (c)hanged version or leave (d)eleted?") % f,
(_("&Changed"), _("&Deleted")), _("c")) == _("c"):
act("prompt recreating", "g", f, m2.flags(f))
else:
act("remote created", "g", f, m2.flags(f))
return action
def actionkey(a):
return a[1] == 'r' and -1 or 0, a
def applyupdates(repo, action, wctx, mctx):
"apply the merge action list to the working directory"
updated, merged, removed, unresolved = 0, 0, 0, 0
ms = mergestate(repo)
ms.reset(wctx.parents()[0].node())
moves = []
action.sort(key=actionkey)
# prescan for merges
for a in action:
f, m = a[:2]
if m == 'm': # merge
f2, fd, flags, move = a[2:]
repo.ui.debug(_("preserving %s for resolve of %s\n") % (f, fd))
fcl = wctx[f]
fco = mctx[f2]
fca = fcl.ancestor(fco) or repo.filectx(f, fileid=nullrev)
ms.add(fcl, fco, fca, fd, flags)
if f != fd and move:
moves.append(f)
# remove renamed files after safely stored
for f in moves:
if util.lexists(repo.wjoin(f)):
repo.ui.debug(_("removing %s\n") % f)
os.unlink(repo.wjoin(f))
audit_path = util.path_auditor(repo.root)
for a in action:
f, m = a[:2]
if f and f[0] == "/":
continue
if m == "r": # remove
repo.ui.note(_("removing %s\n") % f)
audit_path(f)
try:
util.unlink(repo.wjoin(f))
except OSError, inst:
if inst.errno != errno.ENOENT:
repo.ui.warn(_("update failed to remove %s: %s!\n") %
(f, inst.strerror))
removed += 1
elif m == "m": # merge
f2, fd, flags, move = a[2:]
r = ms.resolve(fd, wctx, mctx)
if r > 0:
unresolved += 1
else:
if r is None:
updated += 1
else:
merged += 1
util.set_flags(repo.wjoin(fd), 'l' in flags, 'x' in flags)
if f != fd and move and util.lexists(repo.wjoin(f)):
repo.ui.debug(_("removing %s\n") % f)
os.unlink(repo.wjoin(f))
elif m == "g": # get
flags = a[2]
repo.ui.note(_("getting %s\n") % f)
t = mctx.filectx(f).data()
repo.wwrite(f, t, flags)
updated += 1
elif m == "d": # directory rename
f2, fd, flags = a[2:]
if f:
repo.ui.note(_("moving %s to %s\n") % (f, fd))
t = wctx.filectx(f).data()
repo.wwrite(fd, t, flags)
util.unlink(repo.wjoin(f))
if f2:
repo.ui.note(_("getting %s to %s\n") % (f2, fd))
t = mctx.filectx(f2).data()
repo.wwrite(fd, t, flags)
updated += 1
elif m == "dr": # divergent renames
fl = a[2]
repo.ui.warn(_("warning: detected divergent renames of %s to:\n") % f)
for nf in fl:
repo.ui.warn(" %s\n" % nf)
elif m == "e": # exec
flags = a[2]
util.set_flags(repo.wjoin(f), 'l' in flags, 'x' in flags)
return updated, merged, removed, unresolved
def recordupdates(repo, action, branchmerge):
"record merge actions to the dirstate"
for a in action:
f, m = a[:2]
if m == "r": # remove
if branchmerge:
repo.dirstate.remove(f)
else:
repo.dirstate.forget(f)
elif m == "a": # re-add
if not branchmerge:
repo.dirstate.add(f)
elif m == "f": # forget
repo.dirstate.forget(f)
elif m == "e": # exec change
repo.dirstate.normallookup(f)
elif m == "g": # get
if branchmerge:
repo.dirstate.normaldirty(f)
else:
repo.dirstate.normal(f)
elif m == "m": # merge
f2, fd, flag, move = a[2:]
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.
repo.dirstate.normallookup(fd)
if move:
repo.dirstate.forget(f)
elif m == "d": # directory rename
f2, fd, flag = a[2:]
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.forget(f)
def update(repo, node, branchmerge, force, partial):
"""
Perform a merge between the working directory and the given node
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)
"""
wlock = repo.wlock()
try:
wc = repo[None]
if node is None:
# tip of current branch
try:
node = repo.branchtags()[wc.branch()]
except KeyError:
if wc.branch() == "default": # no default branch!
node = repo.lookup("tip") # update to tip
else:
raise util.Abort(_("branch %s not found") % wc.branch())
overwrite = force and not branchmerge
pl = wc.parents()
p1, p2 = pl[0], repo[node]
pa = p1.ancestor(p2)
fp1, fp2, xp1, xp2 = p1.node(), p2.node(), str(p1), str(p2)
fastforward = False
### check phase
if not overwrite and len(pl) > 1:
raise util.Abort(_("outstanding uncommitted merges"))
if branchmerge:
if pa == p2:
raise util.Abort(_("can't merge with ancestor"))
elif pa == p1:
if p1.branch() != p2.branch():
fastforward = True
else:
raise util.Abort(_("nothing to merge (use 'hg update'"
" or check 'hg heads')"))
if not force and (wc.files() or wc.deleted()):
raise util.Abort(_("outstanding uncommitted changes "
"(use 'hg status' to list changes)"))
elif not overwrite:
if pa == p1 or pa == p2: # linear
pass # all good
elif p1.branch() == p2.branch():
if wc.files() or wc.deleted():
raise util.Abort(_("crosses branches (use 'hg merge' or "
"'hg update -C' to discard changes)"))
raise util.Abort(_("crosses branches (use 'hg merge' "
"or 'hg update -C')"))
elif wc.files() or wc.deleted():
raise util.Abort(_("crosses named branches (use "
"'hg update -C' to discard changes)"))
else:
# Allow jumping branches if there are no changes
overwrite = True
### calculate phase
action = []
if not force:
_checkunknown(wc, p2)
if not util.checkcase(repo.path):
_checkcollision(p2)
action += _forgetremoved(wc, p2, branchmerge)
action += manifestmerge(repo, wc, p2, pa, overwrite, partial)
### apply phase
if not branchmerge: # just jump to the new rev
fp1, fp2, xp1, xp2 = fp2, nullid, xp2, ''
if not partial:
repo.hook('preupdate', throw=True, parent1=xp1, parent2=xp2)
stats = applyupdates(repo, action, wc, p2)
if not partial:
recordupdates(repo, action, branchmerge)
repo.dirstate.setparents(fp1, fp2)
if not branchmerge and not fastforward:
repo.dirstate.setbranch(p2.branch())
repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3])
return stats
finally:
wlock.release()