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# merge.py - directory-level update/merge handling for Mercurial
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#
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# Copyright 2006 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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from node import *
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from i18n import gettext as _
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from demandload import *
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demandload(globals(), "errno util os tempfile")
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def filemerge(repo, fw, fo, fd, my, other, p1, p2, move):
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"""perform a 3-way merge in the working directory
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fw = filename in the working directory and first parent
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fo = filename in other parent
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fd = destination filename
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my = fileid in first parent
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other = fileid in second parent
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p1, p2 = hex changeset ids for merge command
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move = whether to move or copy the file to the destination
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TODO:
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if fw is copied in the working directory, we get confused
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implement move and fd
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"""
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def temp(prefix, ctx):
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pre = "%s~%s." % (os.path.basename(ctx.path()), prefix)
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(fd, name) = tempfile.mkstemp(prefix=pre)
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f = os.fdopen(fd, "wb")
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repo.wwrite(ctx.path(), ctx.data(), f)
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f.close()
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return name
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fcm = repo.filectx(fw, fileid=my)
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fco = repo.filectx(fo, fileid=other)
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fca = fcm.ancestor(fco)
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if not fca:
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fca = repo.filectx(fw, fileid=-1)
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a = repo.wjoin(fw)
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b = temp("base", fca)
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c = temp("other", fco)
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repo.ui.note(_("resolving %s\n") % fw)
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repo.ui.debug(_("my %s other %s ancestor %s\n") % (fcm, fco, fca))
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cmd = (os.environ.get("HGMERGE") or repo.ui.config("ui", "merge")
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or "hgmerge")
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r = util.system('%s "%s" "%s" "%s"' % (cmd, a, b, c), cwd=repo.root,
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environ={'HG_FILE': fw,
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'HG_MY_NODE': p1,
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'HG_OTHER_NODE': p2})
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if r:
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repo.ui.warn(_("merging %s failed!\n") % fw)
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os.unlink(b)
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os.unlink(c)
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return r
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def checkunknown(repo, m2, wctx):
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"""
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check for collisions between unknown files and files in m2
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"""
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for f in wctx.unknown():
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if f in m2:
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if repo.file(f).cmp(m2[f], repo.wread(f)):
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raise util.Abort(_("'%s' already exists in the working"
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" dir and differs from remote") % f)
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def forgetremoved(m2, wctx):
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"""
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Forget removed files
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If we're jumping between revisions (as opposed to merging), and if
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neither the working directory nor the target rev has the file,
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then we need to remove it from the dirstate, to prevent the
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dirstate from listing the file when it is no longer in the
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manifest.
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"""
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action = []
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for f in wctx.deleted() + wctx.removed():
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if f not in m2:
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action.append((f, "f"))
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return action
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def nonoverlap(d1, d2):
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"""
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Return list of elements in d1 not in d2
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"""
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l = []
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for d in d1:
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if d not in d2:
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l.append(d)
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l.sort()
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return l
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def findold(fctx, limit):
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"""
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find files that path was copied from, back to linkrev limit
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"""
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old = {}
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orig = fctx.path()
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visit = [fctx]
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while visit:
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fc = visit.pop()
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if fc.rev() < limit:
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continue
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if fc.path() != orig and fc.path() not in old:
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old[fc.path()] = 1
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visit += fc.parents()
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old = old.keys()
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old.sort()
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return old
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def findcopies(repo, m1, m2, limit):
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"""
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Find moves and copies between m1 and m2 back to limit linkrev
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"""
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# avoid silly behavior for update from empty dir
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if not m1:
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return {}
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dcopies = repo.dirstate.copies()
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copy = {}
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match = {}
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u1 = nonoverlap(m1, m2)
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u2 = nonoverlap(m2, m1)
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ctx = util.cachefunc(lambda f,n: repo.filectx(f, fileid=n[:20]))
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def checkpair(c, f2, man):
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''' check if an apparent pair actually matches '''
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c2 = ctx(f2, man[f2])
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ca = c.ancestor(c2)
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if ca:
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copy[c.path()] = f2
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copy[f2] = c.path()
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for f in u1:
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c = ctx(dcopies.get(f, f), m1[f])
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for of in findold(c, limit):
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if of in m2:
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checkpair(c, of, m2)
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else:
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match.setdefault(of, []).append(f)
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for f in u2:
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c = ctx(f, m2[f])
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for of in findold(c, limit):
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if of in m1:
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checkpair(c, of, m1)
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elif of in match:
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for mf in match[of]:
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checkpair(c, mf, m1)
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return copy
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def filtermanifest(man, partial):
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if partial:
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for k in man.keys():
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if not partial(k): del man[k]
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def manifestmerge(ui, m1, m2, ma, overwrite, backwards):
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"""
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Merge manifest m1 with m2 using ancestor ma and generate merge action list
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"""
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def fmerge(f):
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"""merge executable flags"""
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a, b, c = ma.execf(f), m1.execf(f), m2.execf(f)
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return ((a^b) | (a^c)) ^ a
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action = []
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def act(msg, f, m, *args):
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ui.debug(" %s: %s -> %s\n" % (f, msg, m))
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action.append((f, m) + args)
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# Compare manifests
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for f, n in m1.iteritems():
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if f in m2:
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# are files different?
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if n != m2[f]:
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a = ma.get(f, nullid)
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# are both different from the ancestor?
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if not overwrite and n != a and m2[f] != a:
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act("versions differ", f, "m", fmerge(f), n[:20], m2[f])
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# are we clobbering?
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# is remote's version newer?
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# or are we going back in time and clean?
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elif overwrite or m2[f] != a or (backwards and not n[20:]):
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act("remote is newer", f, "g", m2.execf(f), m2[f])
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# local is newer, not overwrite, check mode bits
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elif fmerge(f) != m1.execf(f):
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act("update permissions", f, "e", m2.execf(f))
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# contents same, check mode bits
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elif m1.execf(f) != m2.execf(f):
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if overwrite or fmerge(f) != m1.execf(f):
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act("update permissions", f, "e", m2.execf(f))
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del m2[f]
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elif f in ma:
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if n != ma[f] and not overwrite:
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if ui.prompt(
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(_(" local changed %s which remote deleted\n") % f) +
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_("(k)eep or (d)elete?"), _("[kd]"), _("k")) == _("d"):
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act("prompt delete", f, "r")
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else:
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act("other deleted", f, "r")
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else:
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# file is created on branch or in working directory
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if (overwrite and n[20:] != "u") or (backwards and not n[20:]):
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act("remote deleted", f, "r")
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for f, n in m2.iteritems():
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if f in ma:
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if overwrite or backwards:
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act("recreating", f, "g", m2.execf(f), n)
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elif n != ma[f]:
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if ui.prompt(
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(_("remote changed %s which local deleted\n") % f) +
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_("(k)eep or (d)elete?"), _("[kd]"), _("k")) == _("k"):
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act("prompt recreating", f, "g", m2.execf(f), n)
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else:
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act("remote created", f, "g", m2.execf(f), n)
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return action
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def applyupdates(repo, action, xp1, xp2):
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updated, merged, removed, unresolved = 0, 0, 0, 0
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action.sort()
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for a in action:
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f, m = a[:2]
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if f[0] == "/":
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continue
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if m == "r": # remove
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repo.ui.note(_("removing %s\n") % f)
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util.audit_path(f)
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try:
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util.unlink(repo.wjoin(f))
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except OSError, inst:
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if inst.errno != errno.ENOENT:
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repo.ui.warn(_("update failed to remove %s: %s!\n") %
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(f, inst.strerror))
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removed +=1
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elif m == "m": # merge
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flag, my, other = a[2:]
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repo.ui.status(_("merging %s\n") % f)
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if filemerge(repo, f, f, f, my, other, xp1, xp2, False):
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unresolved += 1
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util.set_exec(repo.wjoin(f), flag)
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merged += 1
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elif m == "g": # get
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flag, node = a[2:]
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repo.ui.note(_("getting %s\n") % f)
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t = repo.file(f).read(node)
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repo.wwrite(f, t)
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util.set_exec(repo.wjoin(f), flag)
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updated += 1
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elif m == "e": # exec
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flag = a[2:]
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util.set_exec(repo.wjoin(f), flag)
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return updated, merged, removed, unresolved
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def recordupdates(repo, action, branchmerge):
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for a in action:
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f, m = a[:2]
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if m == "r": # remove
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if branchmerge:
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repo.dirstate.update([f], 'r')
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else:
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repo.dirstate.forget([f])
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elif m == "f": # forget
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repo.dirstate.forget([f])
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elif m == "g": # get
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if branchmerge:
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repo.dirstate.update([f], 'n', st_mtime=-1)
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else:
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repo.dirstate.update([f], 'n')
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elif m == "m": # merge
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flag, my, other = a[2:]
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if branchmerge:
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# We've done a branch merge, mark this file as merged
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# so that we properly record the merger later
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repo.dirstate.update([f], 'm')
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else:
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# We've update-merged a locally modified file, so
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# we set the dirstate to emulate a normal checkout
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# of that file some time in the past. Thus our
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# merge will appear as a normal local file
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# modification.
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fl = repo.file(f)
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f_len = fl.size(fl.rev(other))
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repo.dirstate.update([f], 'n', st_size=f_len, st_mtime=-1)
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def update(repo, node, branchmerge=False, force=False, partial=None,
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wlock=None, show_stats=True, remind=True):
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overwrite = force and not branchmerge
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forcemerge = force and branchmerge
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if not wlock:
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wlock = repo.wlock()
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### check phase
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wc = repo.workingctx()
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pl = wc.parents()
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if not overwrite and len(pl) > 1:
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raise util.Abort(_("outstanding uncommitted merges"))
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p1, p2 = pl[0], repo.changectx(node)
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pa = p1.ancestor(p2)
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# are we going backwards?
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backwards = (pa == p2)
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# is there a linear path from p1 to p2?
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if pa == p1 or pa == p2:
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if branchmerge:
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raise util.Abort(_("there is nothing to merge, just use "
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"'hg update' or look at 'hg heads'"))
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elif not (overwrite or branchmerge):
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raise util.Abort(_("update spans branches, use 'hg merge' "
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"or 'hg update -C' to lose changes"))
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if branchmerge and not forcemerge:
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if wc.modified() or wc.added() or wc.removed():
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raise util.Abort(_("outstanding uncommitted changes"))
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m1 = wc.manifest().copy()
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m2 = p2.manifest().copy()
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ma = pa.manifest()
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# resolve the manifest to determine which files
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# we care about merging
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repo.ui.note(_("resolving manifests\n"))
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repo.ui.debug(_(" overwrite %s branchmerge %s partial %s\n") %
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(overwrite, branchmerge, bool(partial)))
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repo.ui.debug(_(" ancestor %s local %s remote %s\n") % (p1, p2, pa))
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action = []
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copy = {}
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filtermanifest(m1, partial)
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filtermanifest(m2, partial)
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if not force:
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checkunknown(repo, m2, wc)
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if not branchmerge:
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action += forgetremoved(m2, wc)
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if not (backwards or overwrite):
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copy = findcopies(repo, m1, m2, pa.rev())
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action += manifestmerge(repo.ui, m1, m2, ma, overwrite, backwards)
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del m1, m2, ma
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### apply phase
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if not branchmerge:
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# we don't need to do any magic, just jump to the new rev
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p1, p2 = p2, repo.changectx(nullid)
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xp1, xp2 = str(p1), str(p2)
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if not p2: xp2 = ''
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repo.hook('preupdate', throw=True, parent1=xp1, parent2=xp2)
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updated, merged, removed, unresolved = applyupdates(repo, action, xp1, xp2)
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# update dirstate
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if not partial:
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recordupdates(repo, action, branchmerge)
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repo.dirstate.setparents(p1.node(), p2.node())
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if show_stats:
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stats = ((updated, _("updated")),
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(merged - unresolved, _("merged")),
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(removed, _("removed")),
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(unresolved, _("unresolved")))
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note = ", ".join([_("%d files %s") % s for s in stats])
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repo.ui.status("%s\n" % note)
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if not partial:
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if branchmerge:
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if unresolved:
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repo.ui.status(_("There are unresolved merges,"
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" you can redo the full merge using:\n"
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" hg update -C %s\n"
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" hg merge %s\n"
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% (p1.rev(), p2.rev())))
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elif remind:
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repo.ui.status(_("(branch merge, don't forget to commit)\n"))
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elif unresolved:
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repo.ui.status(_("There are unresolved merges with"
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" locally modified files.\n"))
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repo.hook('update', parent1=xp1, parent2=xp2, error=unresolved)
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return unresolved
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