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# merge.py - directory-level update/merge handling for Mercurial
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#
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# Copyright 2006, 2007 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 nullid, nullrev
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from i18n import _
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import errno, util, os, filemerge, copies
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def _checkunknown(wctx, mctx):
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"check for collisions between unknown files and files in mctx"
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for f in wctx.unknown():
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if f in mctx and mctx[f].cmp(wctx[f].data()):
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raise util.Abort(_("untracked file in working directory differs"
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" from file in requested revision: '%s'") % f)
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def _checkcollision(mctx):
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"check for case folding collisions in the destination context"
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folded = {}
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for fn in mctx:
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fold = fn.lower()
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if fold in folded:
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raise util.Abort(_("case-folding collision between %s and %s")
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% (fn, folded[fold]))
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folded[fold] = fn
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def _forgetremoved(wctx, mctx, branchmerge):
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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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If we're merging, and the other revision has removed a file
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that is not present in the working directory, we need to mark it
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as removed.
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"""
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action = []
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state = branchmerge and 'r' or 'f'
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for f in wctx.deleted():
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if f not in mctx:
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action.append((f, state))
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if not branchmerge:
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for f in wctx.removed():
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if f not in mctx:
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action.append((f, "f"))
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return action
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def manifestmerge(repo, p1, p2, pa, overwrite, partial):
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"""
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Merge p1 and p2 with ancestor ma and generate merge action list
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overwrite = whether we clobber working files
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partial = function to filter file lists
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"""
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repo.ui.note(_("resolving manifests\n"))
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repo.ui.debug(_(" overwrite %s partial %s\n") % (overwrite, bool(partial)))
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repo.ui.debug(_(" ancestor %s local %s remote %s\n") % (pa, p1, p2))
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m1 = p1.manifest()
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m2 = p2.manifest()
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ma = pa.manifest()
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backwards = (pa == p2)
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action = []
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copy, copied, diverge = {}, {}, {}
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def fmerge(f, f2=None, fa=None):
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"""merge flags"""
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if not f2:
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f2 = f
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fa = f
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a, m, n = ma.flags(fa), m1.flags(f), m2.flags(f2)
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if m == n: # flags agree
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return m # unchanged
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if m and n: # flags are set but don't agree
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if not a: # both differ from parent
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r = repo.ui.prompt(
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_(" conflicting flags for %s\n"
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"(n)one, e(x)ec or sym(l)ink?") % f, "[nxl]", "n")
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return r != "n" and r or ''
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if m == a:
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return n # changed from m to n
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return m # changed from n to m
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if m and m != a: # changed from a to m
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return m
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if n and n != a: # changed from a to n
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return n
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return '' # flag was cleared
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def act(msg, m, f, *args):
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repo.ui.debug(" %s: %s -> %s\n" % (f, msg, m))
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action.append((f, m) + args)
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if pa and not (backwards or overwrite):
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copy, diverge = copies.copies(repo, p1, p2, pa)
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copied = dict.fromkeys(copy.values())
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for of, fl in diverge.items():
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act("divergent renames", "dr", of, fl)
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# Compare manifests
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for f, n in m1.iteritems():
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if partial and not partial(f):
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continue
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if f in m2:
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if overwrite or backwards:
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rflags = m2.flags(f)
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else:
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rflags = fmerge(f)
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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 we clobbering?
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if overwrite:
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act("clobbering", "g", f, rflags)
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# or are we going back in time and clean?
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elif backwards and not n[20:]:
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act("reverting", "g", f, rflags)
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# are both different from the ancestor?
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elif n != a and m2[f] != a:
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act("versions differ", "m", f, f, f, rflags, False)
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# is remote's version newer?
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elif m2[f] != a:
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act("remote is newer", "g", f, rflags)
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# local is newer, not overwrite, check mode bits
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elif m1.flags(f) != rflags:
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act("update permissions", "e", f, rflags)
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# contents same, check mode bits
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elif m1.flags(f) != rflags:
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act("update permissions", "e", f, rflags)
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elif f in copied:
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continue
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elif f in copy:
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f2 = copy[f]
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if f2 not in m2: # directory rename
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act("remote renamed directory to " + f2, "d",
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f, None, f2, m1.flags(f))
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elif f2 in m1: # case 2 A,B/B/B
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act("local copied to " + f2, "m",
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f, f2, f, fmerge(f, f2, f2), False)
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else: # case 4,21 A/B/B
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act("local moved to " + f2, "m",
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f, f2, f, fmerge(f, f2, f2), False)
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elif f in ma:
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if n != ma[f] and not overwrite:
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if repo.ui.prompt(
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_(" local changed %s which remote deleted\n"
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"use (c)hanged version or (d)elete?") % f,
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_("[cd]"), _("c")) == _("d"):
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act("prompt delete", "r", f)
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else:
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act("other deleted", "r", f)
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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", "r", f)
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for f, n in m2.iteritems():
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if partial and not partial(f):
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continue
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if f in m1:
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continue
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if f in copied:
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continue
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if f in copy:
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f2 = copy[f]
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if f2 not in m1: # directory rename
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act("local renamed directory to " + f2, "d",
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None, f, f2, m2.flags(f))
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elif f2 in m2: # rename case 1, A/A,B/A
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act("remote copied to " + f, "m",
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f2, f, f, fmerge(f2, f, f2), False)
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else: # case 3,20 A/B/A
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act("remote moved to " + f, "m",
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f2, f, f, fmerge(f2, f, f2), True)
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elif f in ma:
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if overwrite or backwards:
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act("recreating", "g", f, m2.flags(f))
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elif n != ma[f]:
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if repo.ui.prompt(
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_("remote changed %s which local deleted\n"
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"use (c)hanged version or leave (d)eleted?") % f,
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_("[cd]"), _("c")) == _("c"):
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act("prompt recreating", "g", f, m2.flags(f))
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else:
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act("remote created", "g", f, m2.flags(f))
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return action
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def applyupdates(repo, action, wctx, mctx):
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"apply the merge action list to the working directory"
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updated, merged, removed, unresolved = 0, 0, 0, 0
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action.sort()
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# prescan for copy/renames
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for a in action:
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f, m = a[:2]
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if m == 'm': # merge
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f2, fd, flags, move = a[2:]
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if f != fd:
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repo.ui.debug(_("copying %s to %s\n") % (f, fd))
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repo.wwrite(fd, repo.wread(f), flags)
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audit_path = util.path_auditor(repo.root)
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for a in action:
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f, m = a[:2]
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if f and 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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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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f2, fd, flags, move = a[2:]
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r = filemerge.filemerge(repo, f, fd, f2, wctx, mctx)
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if r > 0:
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unresolved += 1
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else:
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if r is None:
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updated += 1
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else:
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merged += 1
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util.set_flags(repo.wjoin(fd), flags)
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if f != fd and move and util.lexists(repo.wjoin(f)):
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repo.ui.debug(_("removing %s\n") % f)
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os.unlink(repo.wjoin(f))
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elif m == "g": # get
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flags = a[2]
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repo.ui.note(_("getting %s\n") % f)
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t = mctx.filectx(f).data()
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repo.wwrite(f, t, flags)
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updated += 1
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elif m == "d": # directory rename
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f2, fd, flags = a[2:]
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if f:
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repo.ui.note(_("moving %s to %s\n") % (f, fd))
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t = wctx.filectx(f).data()
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repo.wwrite(fd, t, flags)
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util.unlink(repo.wjoin(f))
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if f2:
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repo.ui.note(_("getting %s to %s\n") % (f2, fd))
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t = mctx.filectx(f2).data()
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repo.wwrite(fd, t, flags)
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updated += 1
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elif m == "dr": # divergent renames
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fl = a[2]
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repo.ui.warn("warning: detected divergent renames of %s to:\n" % f)
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for nf in fl:
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repo.ui.warn(" %s\n" % nf)
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elif m == "e": # exec
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flags = a[2]
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util.set_flags(repo.wjoin(f), flags)
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return updated, merged, removed, unresolved
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def recordupdates(repo, action, branchmerge):
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"record merge actions to the dirstate"
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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.remove(f)
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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 in "ge": # get or exec change
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if branchmerge:
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repo.dirstate.normaldirty(f)
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else:
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repo.dirstate.normal(f)
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elif m == "m": # merge
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f2, fd, flag, move = 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.merge(fd)
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if f != f2: # copy/rename
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if move:
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repo.dirstate.remove(f)
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if f != fd:
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repo.dirstate.copy(f, fd)
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else:
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repo.dirstate.copy(f2, fd)
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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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repo.dirstate.normallookup(fd)
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if move:
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repo.dirstate.forget(f)
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elif m == "d": # directory rename
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f2, fd, flag = a[2:]
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if not f2 and f not in repo.dirstate:
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# untracked file moved
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continue
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if branchmerge:
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repo.dirstate.add(fd)
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if f:
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repo.dirstate.remove(f)
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repo.dirstate.copy(f, fd)
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if f2:
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repo.dirstate.copy(f2, fd)
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else:
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repo.dirstate.normal(fd)
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if f:
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repo.dirstate.forget(f)
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def update(repo, node, branchmerge, force, partial):
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"""
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Perform a merge between the working directory and the given node
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branchmerge = whether to merge between branches
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force = whether to force branch merging or file overwriting
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partial = a function to filter file lists (dirstate not updated)
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"""
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wlock = repo.wlock()
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try:
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wc = repo.workingctx()
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if node is None:
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# tip of current branch
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try:
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node = repo.branchtags()[wc.branch()]
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except KeyError:
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if wc.branch() == "default": # no default branch!
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node = repo.lookup("tip") # update to tip
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else:
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raise util.Abort(_("branch %s not found") % wc.branch())
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overwrite = force and not branchmerge
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pl = wc.parents()
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p1, p2 = pl[0], repo.changectx(node)
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pa = p1.ancestor(p2)
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fp1, fp2, xp1, xp2 = p1.node(), p2.node(), str(p1), str(p2)
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fastforward = False
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### check phase
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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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if branchmerge:
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if pa == p2:
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raise util.Abort(_("can't merge with ancestor"))
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elif pa == p1:
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if p1.branch() != p2.branch():
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fastforward = True
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else:
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raise util.Abort(_("nothing to merge (use 'hg update'"
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" or check 'hg heads')"))
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if not force and (wc.files() or wc.deleted()):
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raise util.Abort(_("outstanding uncommitted changes"))
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elif not overwrite:
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if pa == p1 or pa == p2: # linear
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pass # all good
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elif p1.branch() == p2.branch():
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if wc.files() or wc.deleted():
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raise util.Abort(_("crosses branches (use 'hg merge' or "
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"'hg update -C' to discard changes)"))
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raise util.Abort(_("crosses branches (use 'hg merge' "
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"or 'hg update -C')"))
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elif wc.files() or wc.deleted():
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raise util.Abort(_("crosses named branches (use "
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"'hg update -C' to discard changes)"))
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else:
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# Allow jumping branches if there are no changes
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overwrite = True
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### calculate phase
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action = []
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if not force:
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_checkunknown(wc, p2)
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if not util.checkfolding(repo.path):
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_checkcollision(p2)
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action += _forgetremoved(wc, p2, branchmerge)
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action += manifestmerge(repo, wc, p2, pa, overwrite, partial)
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### apply phase
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if not branchmerge: # just jump to the new rev
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fp1, fp2, xp1, xp2 = fp2, nullid, xp2, ''
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if not partial:
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repo.hook('preupdate', throw=True, parent1=xp1, parent2=xp2)
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stats = applyupdates(repo, action, wc, p2)
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if not partial:
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recordupdates(repo, action, branchmerge)
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repo.dirstate.setparents(fp1, fp2)
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if not branchmerge and not fastforward:
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repo.dirstate.setbranch(p2.branch())
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repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3])
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return stats
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finally:
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del wlock
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