# 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(), "util os tempfile")
def fmerge(f, local, other, ancestor):
"""merge executable flags"""
a, b, c = ancestor.execf(f), local.execf(f), other.execf(f)
return ((a^b) | (a^c)) ^ a
def merge3(repo, fn, my, other, p1, p2):
"""perform a 3-way merge in the working directory"""
def temp(prefix, node):
pre = "%s~%s." % (os.path.basename(fn), prefix)
(fd, name) = tempfile.mkstemp(prefix=pre)
f = os.fdopen(fd, "wb")
repo.wwrite(fn, fl.read(node), f)
f.close()
return name
fl = repo.file(fn)
base = fl.ancestor(my, other)
a = repo.wjoin(fn)
b = temp("base", base)
c = temp("other", other)
repo.ui.note(_("resolving %s\n") % fn)
repo.ui.debug(_("file %s: my %s other %s ancestor %s\n") %
(fn, short(my), short(other), short(base)))
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': fn,
'HG_MY_NODE': p1,
'HG_OTHER_NODE': p2,
'HG_FILE_MY_NODE': hex(my),
'HG_FILE_OTHER_NODE': hex(other),
'HG_FILE_BASE_NODE': hex(base)})
if r:
repo.ui.warn(_("merging %s failed!\n") % fn)
os.unlink(b)
os.unlink(c)
return r
def update(repo, node, branchmerge=False, force=False, partial=None,
wlock=None, show_stats=True, remind=True):
overwrite = force and not branchmerge
forcemerge = force and branchmerge
if not wlock:
wlock = repo.wlock()
### check phase
pl = repo.dirstate.parents()
if not overwrite and pl[1] != nullid:
raise util.Abort(_("outstanding uncommitted merges"))
p1, p2 = pl[0], node
pa = repo.changelog.ancestor(p1, p2)
# is there a linear path from p1 to p2?
linear_path = (pa == p1 or pa == p2)
if branchmerge and linear_path:
raise util.Abort(_("there is nothing to merge, just use "
"'hg update' or look at 'hg heads'"))
if not overwrite and not linear_path and not branchmerge:
raise util.Abort(_("update spans branches, use 'hg merge' "
"or 'hg update -C' to lose changes"))
modified, added, removed, deleted, unknown = repo.status()[:5]
if branchmerge and not forcemerge:
if modified or added or removed:
raise util.Abort(_("outstanding uncommitted changes"))
m1n = repo.changelog.read(p1)[0]
m2n = repo.changelog.read(p2)[0]
man = repo.manifest.ancestor(m1n, m2n)
m1 = repo.manifest.read(m1n)
m2 = repo.manifest.read(m2n).copy()
ma = repo.manifest.read(man)
if not force:
for f in unknown:
if f in m2:
if repo.file(f).cmp(m2[f], repo.wread(f)):
raise util.Abort(_("'%s' already exists in the working"
" dir and differs from remote") % f)
# resolve the manifest to determine which files
# we care about merging
repo.ui.note(_("resolving manifests\n"))
repo.ui.debug(_(" overwrite %s branchmerge %s partial %s linear %s\n") %
(overwrite, branchmerge, bool(partial), linear_path))
repo.ui.debug(_(" ancestor %s local %s remote %s\n") %
(short(man), short(m1n), short(m2n)))
merge = {}
get = {}
remove = []
forget = []
# construct a working dir manifest
mw = m1.copy()
umap = dict.fromkeys(unknown)
for f in added + modified + unknown:
mw[f] = ""
# is the wfile new and matches m2?
if (f not in m1 and f in m2 and
not repo.file(f).cmp(m2[f], repo.wread(f))):
mw[f] = m2[f]
mw.set(f, util.is_exec(repo.wjoin(f), mw.execf(f)))
for f in deleted + removed:
if f in mw:
del mw[f]
# 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 linear_path and f not in m2:
forget.append(f)
# Compare manifests
for f, n in mw.iteritems():
if partial and not partial(f):
continue
if f in m2:
s = 0
# are files different?
if n != m2[f]:
a = ma.get(f, nullid)
# are both different from the ancestor?
if n != a and m2[f] != a:
repo.ui.debug(_(" %s versions differ, resolve\n") % f)
merge[f] = (fmerge(f, mw, m2, ma), m1.get(f, nullid), m2[f])
s = 1
# are we clobbering?
# is remote's version newer?
# or are we going back in time?
elif overwrite or m2[f] != a or (p2 == pa and mw[f] == m1[f]):
repo.ui.debug(_(" remote %s is newer, get\n") % f)
get[f] = (m2.execf(f), m2[f])
s = 1
elif f in umap or f in added:
# this unknown file is the same as the checkout
# we need to reset the dirstate if the file was added
get[f] = (m2.execf(f), m2[f])
if not s and mw.execf(f) != m2.execf(f):
if overwrite:
repo.ui.debug(_(" updating permissions for %s\n") % f)
util.set_exec(repo.wjoin(f), m2.execf(f))
else:
if fmerge(f, mw, m2, ma) != mw.execf(f):
repo.ui.debug(_(" updating permissions for %s\n")
% f)
util.set_exec(repo.wjoin(f), mode)
del m2[f]
elif f in ma:
if n != ma[f]:
r = _("d")
if not overwrite and (linear_path or branchmerge):
r = repo.ui.prompt(
(_(" local changed %s which remote deleted\n") % f) +
_("(k)eep or (d)elete?"), _("[kd]"), _("k"))
if r == _("d"):
remove.append(f)
else:
repo.ui.debug(_("other deleted %s\n") % f)
remove.append(f) # other deleted it
else:
# file is created on branch or in working directory
if overwrite and f not in umap:
repo.ui.debug(_("remote deleted %s, clobbering\n") % f)
remove.append(f)
elif n == m1.get(f, nullid): # same as parent
if p2 == pa: # going backwards?
repo.ui.debug(_("remote deleted %s\n") % f)
remove.append(f)
else:
repo.ui.debug(_("local modified %s, keeping\n") % f)
else:
repo.ui.debug(_("working dir created %s, keeping\n") % f)
for f, n in m2.iteritems():
if partial and not partial(f):
continue
if f[0] == "/":
continue
if f in ma and n != ma[f]:
r = _("k")
if not overwrite and (linear_path or branchmerge):
r = repo.ui.prompt(
(_("remote changed %s which local deleted\n") % f) +
_("(k)eep or (d)elete?"), _("[kd]"), _("k"))
if r == _("k"):
get[f] = (m2.execf(f), n)
elif f not in ma:
repo.ui.debug(_("remote created %s\n") % f)
get[f] = (m2.execf(f), n)
else:
if overwrite or p2 == pa: # going backwards?
repo.ui.debug(_("local deleted %s, recreating\n") % f)
get[f] = (m2.execf(f), n)
else:
repo.ui.debug(_("local deleted %s\n") % f)
del mw, m1, m2, ma
### apply phase
if overwrite:
for f in merge:
get[f] = merge[f][:2]
merge = {}
if linear_path or overwrite:
# we don't need to do any magic, just jump to the new rev
p1, p2 = p2, nullid
xp1 = hex(p1)
xp2 = hex(p2)
if p2 == nullid: xxp2 = ''
else: xxp2 = xp2
repo.hook('preupdate', throw=True, parent1=xp1, parent2=xxp2)
# get the files we don't need to change
files = get.keys()
files.sort()
for f in files:
flag, node = get[f]
if f[0] == "/":
continue
repo.ui.note(_("getting %s\n") % f)
t = repo.file(f).read(node)
repo.wwrite(f, t)
util.set_exec(repo.wjoin(f), flag)
# merge the tricky bits
unresolved = []
files = merge.keys()
files.sort()
for f in files:
repo.ui.status(_("merging %s\n") % f)
flag, my, other = merge[f]
ret = merge3(repo, f, my, other, xp1, xp2)
if ret:
unresolved.append(f)
util.set_exec(repo.wjoin(f), flag)
remove.sort()
for f in 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))
# update dirstate
if not partial:
repo.dirstate.setparents(p1, p2)
repo.dirstate.forget(forget)
if branchmerge:
repo.dirstate.update(remove, 'r')
else:
repo.dirstate.forget(remove)
files = get.keys()
files.sort()
for f in files:
if branchmerge:
repo.dirstate.update([f], 'n', st_mtime=-1)
else:
repo.dirstate.update([f], 'n')
files = merge.keys()
files.sort()
for f in files:
if branchmerge:
# We've done a branch merge, mark this file as merged
# so that we properly record the merger later
repo.dirstate.update([f], 'm')
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.
fl = repo.file(f)
f_len = fl.size(fl.rev(other))
repo.dirstate.update([f], 'n', st_size=f_len, st_mtime=-1)
if show_stats:
stats = ((len(get), _("updated")),
(len(merge) - len(unresolved), _("merged")),
(len(remove), _("removed")),
(len(unresolved), _("unresolved")))
note = ", ".join([_("%d files %s") % s for s in stats])
repo.ui.status("%s\n" % note)
if not partial:
if branchmerge:
if unresolved:
repo.ui.status(_("There are unresolved merges,"
" you can redo the full merge using:\n"
" hg update -C %s\n"
" hg merge %s\n"
% (repo.changelog.rev(p1),
repo.changelog.rev(p2))))
elif remind:
repo.ui.status(_("(branch merge, don't forget to commit)\n"))
elif unresolved:
repo.ui.status(_("There are unresolved merges with"
" locally modified files.\n"))
repo.hook('update', parent1=xp1, parent2=xxp2, error=len(unresolved))
return len(unresolved)