# merge.py - directory-level update/merge handling for Mercurial
#
# Copyright 2006 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.
from node import *
from i18n import gettext as _
from demandload import *
demandload(globals(), "errno util os tempfile")
def filemerge(repo, fw, fo, wctx, mctx):
"""perform a 3-way merge in the working directory
fw = filename in the working directory
fo = filename in other parent
wctx, mctx = working and merge changecontexts
"""
def temp(prefix, ctx):
pre = "%s~%s." % (os.path.basename(ctx.path()), prefix)
(fd, name) = tempfile.mkstemp(prefix=pre)
f = os.fdopen(fd, "wb")
repo.wwrite(ctx.path(), ctx.data(), f)
f.close()
return name
fcm = wctx.filectx(fw)
fco = mctx.filectx(fo)
if not fco.cmp(fcm.data()): # files identical?
return None
fca = fcm.ancestor(fco)
if not fca:
fca = repo.filectx(fw, fileid=nullrev)
a = repo.wjoin(fw)
b = temp("base", fca)
c = temp("other", fco)
if fw != fo:
repo.ui.status(_("merging %s and %s\n") % (fw, fo))
else:
repo.ui.status(_("merging %s\n") % fw)
repo.ui.debug(_("my %s other %s ancestor %s\n") % (fcm, fco, fca))
cmd = (os.environ.get("HGMERGE") or repo.ui.config("ui", "merge")
or "hgmerge")
r = util.system('%s "%s" "%s" "%s"' % (cmd, a, b, c), cwd=repo.root,
environ={'HG_FILE': fw,
'HG_MY_NODE': str(wctx.parents()[0]),
'HG_OTHER_NODE': str(mctx)})
if r:
repo.ui.warn(_("merging %s failed!\n") % fw)
os.unlink(b)
os.unlink(c)
return r
def checkunknown(wctx, mctx):
"check for collisions between unknown files and files in mctx"
man = mctx.manifest()
for f in wctx.unknown():
if f in man:
if mctx.filectx(f).cmp(wctx.filectx(f).data()):
raise util.Abort(_("untracked local file '%s' differs"\
" from remote version") % f)
def forgetremoved(wctx, mctx):
"""
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.
"""
action = []
man = mctx.manifest()
for f in wctx.deleted() + wctx.removed():
if f not in man:
action.append((f, "f"))
return action
def nonoverlap(d1, d2, d3):
"Return list of elements in d1 not in d2 or d3"
l = []
for d in d1:
if d not in d3 and d not in d2:
l.append(d)
l.sort()
return l
def findold(fctx, limit):
"find files that path was copied from, back to linkrev limit"
old = {}
orig = fctx.path()
visit = [fctx]
while visit:
fc = visit.pop()
if fc.rev() < limit:
continue
if fc.path() != orig and fc.path() not in old:
old[fc.path()] = 1
visit += fc.parents()
old = old.keys()
old.sort()
return old
def findcopies(repo, m1, m2, ma, limit):
"""
Find moves and copies between m1 and m2 back to limit linkrev
"""
if not repo.ui.configbool("merge", "followcopies", True):
return {}
# avoid silly behavior for update from empty dir
if not m1 or not m2 or not ma:
return {}
dcopies = repo.dirstate.copies()
copy = {}
u1 = nonoverlap(m1, m2, ma)
u2 = nonoverlap(m2, m1, ma)
ctx = util.cachefunc(lambda f, n: repo.filectx(f, fileid=n[:20]))
def checkpair(c, f2, man):
''' check if an apparent pair actually matches '''
if f2 not in man:
return
c2 = ctx(f2, man[f2])
ca = c.ancestor(c2)
if not ca or c == ca or c2 == ca:
return
if ca.path() == c.path() or ca.path() == c2.path():
copy[c.path()] = f2
for f in u1:
c = ctx(dcopies.get(f, f), m1[f])
for of in findold(c, limit):
checkpair(c, of, m2)
for f in u2:
c = ctx(f, m2[f])
for of in findold(c, limit):
checkpair(c, of, m1)
return copy
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 = {}
def fmerge(f, f2=None, fa=None):
"""merge executable flags"""
if not f2:
f2 = f
fa = f
a, b, c = ma.execf(fa), m1.execf(f), m2.execf(f2)
return ((a^b) | (a^c)) ^ a
def act(msg, m, f, *args):
repo.ui.debug(" %s: %s -> %s\n" % (f, msg, m))
action.append((f, m) + args)
if not (backwards or overwrite):
copy = findcopies(repo, m1, m2, ma, pa.rev())
copied = dict.fromkeys(copy.values())
# Compare manifests
for f, n in m1.iteritems():
if partial and not partial(f):
continue
if f in m2:
# are files different?
if n != m2[f]:
a = ma.get(f, nullid)
# are both different from the ancestor?
if not overwrite and n != a and m2[f] != a:
act("versions differ", "m", f, f, f, fmerge(f), False)
# are we clobbering?
# is remote's version newer?
# or are we going back in time and clean?
elif overwrite or m2[f] != a or (backwards and not n[20:]):
act("remote is newer", "g", f, m2.execf(f))
# local is newer, not overwrite, check mode bits
elif fmerge(f) != m1.execf(f):
act("update permissions", "e", f, m2.execf(f))
# contents same, check mode bits
elif m1.execf(f) != m2.execf(f):
if overwrite or fmerge(f) != m1.execf(f):
act("update permissions", "e", f, m2.execf(f))
elif f in copied:
continue
elif f in copy:
f2 = copy[f]
if 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") % f) +
_("(k)eep or (d)elete?"), _("[kd]"), _("k")) == _("d"):
act("prompt delete", "r", f)
else:
act("other deleted", "r", 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 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.execf(f))
elif n != ma[f]:
if repo.ui.prompt(
(_("remote changed %s which local deleted\n") % f) +
_("(k)eep or (d)elete?"), _("[kd]"), _("k")) == _("k"):
act("prompt recreating", "g", f, m2.execf(f))
else:
act("remote created", "g", f, m2.execf(f))
return action
def applyupdates(repo, action, wctx, mctx):
"apply the merge action list to the working directory"
updated, merged, removed, unresolved = 0, 0, 0, 0
action.sort()
for a in action:
f, m = a[:2]
if f[0] == "/":
continue
if m == "r": # remove
repo.ui.note(_("removing %s\n") % f)
util.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, flag, move = a[2:]
r = filemerge(repo, f, f2, wctx, mctx)
if r > 0:
unresolved += 1
else:
if r is None:
updated += 1
else:
merged += 1
if f != fd:
repo.ui.debug(_("copying %s to %s\n") % (f, fd))
repo.wwrite(fd, repo.wread(f))
if move:
repo.ui.debug(_("removing %s\n") % f)
os.unlink(repo.wjoin(f))
util.set_exec(repo.wjoin(fd), flag)
elif m == "g": # get
flag = a[2]
repo.ui.note(_("getting %s\n") % f)
t = mctx.filectx(f).data()
repo.wwrite(f, t)
util.set_exec(repo.wjoin(f), flag)
updated += 1
elif m == "e": # exec
flag = a[2]
util.set_exec(repo.wjoin(f), flag)
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.update([f], 'r')
else:
repo.dirstate.forget([f])
elif m == "f": # forget
repo.dirstate.forget([f])
elif m == "g": # get
if branchmerge:
repo.dirstate.update([f], 'n', st_mtime=-1)
else:
repo.dirstate.update([f], 'n')
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.update([fd], 'm')
if f != f2: # copy/rename
if move:
repo.dirstate.update([f], 'r')
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.update([fd], 'n', st_size=-1, st_mtime=-1)
if move:
repo.dirstate.forget([f])
def update(repo, node, branchmerge, force, partial, wlock):
"""
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 = working dir lock, if already held
"""
if not wlock:
wlock = repo.wlock()
overwrite = force and not branchmerge
forcemerge = force and branchmerge
wc = repo.workingctx()
pl = wc.parents()
p1, p2 = pl[0], repo.changectx(node)
pa = p1.ancestor(p2)
fp1, fp2, xp1, xp2 = p1.node(), p2.node(), str(p1), str(p2)
### check phase
if not overwrite and len(pl) > 1:
raise util.Abort(_("outstanding uncommitted merges"))
if pa == p1 or pa == p2: # is there a linear path from p1 to p2?
if branchmerge:
raise util.Abort(_("there is nothing to merge, just use "
"'hg update' or look at 'hg heads'"))
elif not (overwrite or branchmerge):
raise util.Abort(_("update spans branches, use 'hg merge' "
"or 'hg update -C' to lose changes"))
if branchmerge and not forcemerge:
if wc.files():
raise util.Abort(_("outstanding uncommitted changes"))
### calculate phase
action = []
if not force:
checkunknown(wc, p2)
if not branchmerge:
action += forgetremoved(wc, p2)
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)
repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3])
if not branchmerge:
repo.opener("branch", "w").write(p2.branch() + "\n")
return stats