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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 fmerge(f, local, other, ancestor):
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"""merge executable flags"""
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a, b, c = ancestor.execf(f), local.execf(f), other.execf(f)
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return ((a^b) | (a^c)) ^ a
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def merge3(repo, fn, my, other, p1, p2):
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"""perform a 3-way merge in the working directory"""
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def temp(prefix, node):
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pre = "%s~%s." % (os.path.basename(fn), 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(fn, fl.read(node), f)
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f.close()
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return name
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fl = repo.file(fn)
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base = fl.ancestor(my, other)
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a = repo.wjoin(fn)
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b = temp("base", base)
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c = temp("other", other)
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repo.ui.note(_("resolving %s\n") % fn)
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repo.ui.debug(_("file %s: my %s other %s ancestor %s\n") %
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(fn, short(my), short(other), short(base)))
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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': fn,
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'HG_MY_NODE': p1,
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'HG_OTHER_NODE': p2,
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'HG_FILE_MY_NODE': hex(my),
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'HG_FILE_OTHER_NODE': hex(other),
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'HG_FILE_BASE_NODE': hex(base)})
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if r:
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repo.ui.warn(_("merging %s failed!\n") % fn)
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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, status):
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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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modified, added, removed, deleted, unknown = status[:5]
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for f in 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 workingmanifest(repo, man, status):
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"""
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Update manifest to correspond to the working directory
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"""
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modified, added, removed, deleted, unknown = status[:5]
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for i,l in (("a", added), ("m", modified), ("u", unknown)):
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for f in l:
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man[f] = man.get(f, nullid) + i
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man.set(f, util.is_exec(repo.wjoin(f), man.execf(f)))
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for f in deleted + removed:
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del man[f]
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return man
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def forgetremoved(m2, status):
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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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modified, added, removed, deleted, unknown = status[:5]
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action = []
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for f in deleted + 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 manifestmerge(ui, m1, m2, ma, overwrite, backwards, partial):
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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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action = []
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# Filter manifests
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if partial:
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for f in m1.keys():
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if not partial(f): del m1[f]
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for f in m2.keys():
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if not partial(f): del m2[f]
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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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queued = 0
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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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ui.debug(_(" %s versions differ, resolve\n") % f)
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action.append((f, "m", fmerge(f, m1, m2, ma), n[:20], m2[f]))
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queued = 1
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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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ui.debug(_(" remote %s is newer, get\n") % f)
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action.append((f, "g", m2.execf(f), m2[f]))
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queued = 1
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elif n[20:] in ("u","a"):
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# this unknown file is the same as the checkout
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# we need to reset the dirstate if the file was added
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action.append((f, "g", m2.execf(f), m2[f]))
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# do we still need to look at mode bits?
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if not queued and m1.execf(f) != m2.execf(f):
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if overwrite:
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ui.debug(_(" updating permissions for %s\n") % f)
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action.append((f, "e", m2.execf(f)))
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else:
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mode = fmerge(f, m1, m2, ma)
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if mode != m1.execf(f):
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ui.debug(_(" updating permissions for %s\n")
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% f)
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action.append((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]:
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r = _("d")
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if not overwrite:
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r = 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"))
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if r == _("d"):
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action.append((f, "r"))
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else:
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ui.debug(_("other deleted %s\n") % f)
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action.append((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":
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ui.debug(_("remote deleted %s, clobbering\n") % f)
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action.append((f, "r"))
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elif not n[20:]: # same as parent
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if backwards:
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ui.debug(_("remote deleted %s\n") % f)
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action.append((f, "r"))
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else:
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ui.debug(_("local modified %s, keeping\n") % f)
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else:
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ui.debug(_("working dir created %s, keeping\n") % f)
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for f, n in m2.iteritems():
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if f[0] == "/":
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continue
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if f in ma and n != ma[f]:
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r = _("k")
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if not overwrite:
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r = 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"))
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if r == _("k"):
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action.append((f, "g", m2.execf(f), n))
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elif f not in ma:
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ui.debug(_("remote created %s\n") % f)
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action.append((f, "g", m2.execf(f), n))
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else:
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if overwrite or backwards:
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ui.debug(_("local deleted %s, recreating\n") % f)
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action.append((f, "g", m2.execf(f), n))
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else:
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ui.debug(_("local deleted %s\n") % f)
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return action
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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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pl = repo.dirstate.parents()
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if not overwrite and pl[1] != nullid:
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raise util.Abort(_("outstanding uncommitted merges"))
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p1, p2 = pl[0], node
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pa = repo.changelog.ancestor(p1, 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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linear_path = (pa == p1 or pa == p2)
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if branchmerge and linear_path:
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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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if not linear_path and 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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status = repo.status()
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modified, added, removed, deleted, unknown = status[:5]
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if branchmerge and not forcemerge:
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if modified or added or removed:
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raise util.Abort(_("outstanding uncommitted changes"))
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m1 = repo.changectx(p1).manifest().copy()
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m2 = repo.changectx(p2).manifest().copy()
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ma = repo.changectx(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 linear %s\n") %
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(overwrite, branchmerge, bool(partial), linear_path))
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repo.ui.debug(_(" ancestor %s local %s remote %s\n") %
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(short(p1), short(p2), short(pa)))
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action = []
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m1 = workingmanifest(repo, m1, status)
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if not force:
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checkunknown(repo, m2, status)
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if linear_path:
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action += forgetremoved(m2, status)
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action += manifestmerge(repo.ui, m1, m2, ma, overwrite, backwards, partial)
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del m1, m2, ma
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### apply phase
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if linear_path or overwrite:
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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, nullid
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xp1 = hex(p1)
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xp2 = hex(p2)
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if p2 == nullid: xxp2 = ''
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else: xxp2 = xp2
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repo.hook('preupdate', throw=True, parent1=xp1, parent2=xxp2)
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# update files
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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 merge3(repo, f, my, other, xp1, xp2):
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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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# update dirstate
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if not partial:
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repo.dirstate.setparents(p1, p2)
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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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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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% (repo.changelog.rev(p1),
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repo.changelog.rev(p2))))
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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=xxp2, error=unresolved)
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return unresolved
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