Mercurial > hg
view mercurial/merge.py @ 17488:eabb9a047502
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author | timeless@mozdev.org |
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date | Fri, 17 Aug 2012 13:58:18 -0700 |
parents | 98687cdddcb1 |
children | ce7bc04d863b |
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# merge.py - directory-level update/merge handling for Mercurial # # Copyright 2006, 2007 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from node import nullid, nullrev, hex, bin from i18n import _ import error, scmutil, util, filemerge, copies, subrepo import errno, os, shutil class mergestate(object): '''track 3-way merge state of individual files''' def __init__(self, repo): self._repo = repo self._dirty = False self._read() def reset(self, node=None): self._state = {} if node: self._local = node shutil.rmtree(self._repo.join("merge"), True) self._dirty = False def _read(self): self._state = {} try: f = self._repo.opener("merge/state") for i, l in enumerate(f): if i == 0: self._local = bin(l[:-1]) else: bits = l[:-1].split("\0") self._state[bits[0]] = bits[1:] f.close() except IOError, err: if err.errno != errno.ENOENT: raise self._dirty = False def commit(self): if self._dirty: f = self._repo.opener("merge/state", "w") f.write(hex(self._local) + "\n") for d, v in self._state.iteritems(): f.write("\0".join([d] + v) + "\n") f.close() self._dirty = False def add(self, fcl, fco, fca, fd, flags): hash = util.sha1(fcl.path()).hexdigest() self._repo.opener.write("merge/" + hash, fcl.data()) self._state[fd] = ['u', hash, fcl.path(), fca.path(), hex(fca.filenode()), fco.path(), flags] self._dirty = True def __contains__(self, dfile): return dfile in self._state def __getitem__(self, dfile): return self._state[dfile][0] def __iter__(self): l = self._state.keys() l.sort() for f in l: yield f def mark(self, dfile, state): self._state[dfile][0] = state self._dirty = True def resolve(self, dfile, wctx, octx): if self[dfile] == 'r': return 0 state, hash, lfile, afile, anode, ofile, flags = self._state[dfile] f = self._repo.opener("merge/" + hash) self._repo.wwrite(dfile, f.read(), flags) f.close() fcd = wctx[dfile] fco = octx[ofile] fca = self._repo.filectx(afile, fileid=anode) r = filemerge.filemerge(self._repo, self._local, lfile, fcd, fco, fca) if r is None: # no real conflict del self._state[dfile] elif not r: self.mark(dfile, 'r') return r def _checkunknownfile(repo, wctx, mctx, f): return (not repo.dirstate._ignore(f) and os.path.isfile(repo.wjoin(f)) and repo.dirstate.normalize(f) not in repo.dirstate and mctx[f].cmp(wctx[f])) def _checkunknown(repo, wctx, mctx): "check for collisions between unknown files and files in mctx" error = False for f in mctx: if f not in wctx and _checkunknownfile(repo, wctx, mctx, f): error = True wctx._repo.ui.warn(_("%s: untracked file differs\n") % f) if error: raise util.Abort(_("untracked files in working directory differ " "from files in requested revision")) def _checkcollision(mctx, wctx): "check for case folding collisions in the destination context" folded = {} for fn in mctx: fold = util.normcase(fn) if fold in folded: raise util.Abort(_("case-folding collision between %s and %s") % (fn, folded[fold])) folded[fold] = fn if wctx: # class to delay looking up copy mapping class pathcopies(object): @util.propertycache def map(self): # {dst@mctx: src@wctx} copy mapping return copies.pathcopies(wctx, mctx) pc = pathcopies() for fn in wctx: fold = util.normcase(fn) mfn = folded.get(fold, None) if mfn and mfn != fn and pc.map.get(mfn) != fn: raise util.Abort(_("case-folding collision between %s and %s") % (mfn, fn)) def _forgetremoved(wctx, mctx, branchmerge): """ Forget removed files If we're jumping between revisions (as opposed to merging), and if neither the working directory nor the target rev has the file, then we need to remove it from the dirstate, to prevent the dirstate from listing the file when it is no longer in the manifest. If we're merging, and the other revision has removed a file that is not present in the working directory, we need to mark it as removed. """ action = [] state = branchmerge and 'r' or 'f' for f in wctx.deleted(): if f not in mctx: action.append((f, state)) if not branchmerge: for f in wctx.removed(): if f not in mctx: action.append((f, "f")) return action def manifestmerge(repo, p1, p2, pa, overwrite, partial): """ Merge p1 and p2 with ancestor pa and generate merge action list overwrite = whether we clobber working files partial = function to filter file lists """ def fmerge(f, f2, fa): """merge flags""" a, m, n = ma.flags(fa), m1.flags(f), m2.flags(f2) if m == n: # flags agree return m # unchanged if m and n and not a: # flags set, don't agree, differ from parent r = repo.ui.promptchoice( _(" conflicting flags for %s\n" "(n)one, e(x)ec or sym(l)ink?") % f, (_("&None"), _("E&xec"), _("Sym&link")), 0) if r == 1: return "x" # Exec if r == 2: return "l" # Symlink return "" if m and m != a: # changed from a to m return m if n and n != a: # changed from a to n if (n == 'l' or a == 'l') and m1.get(f) != ma.get(f): # can't automatically merge symlink flag when there # are file-level conflicts here, let filemerge take # care of it return m return n return '' # flag was cleared def act(msg, m, f, *args): repo.ui.debug(" %s: %s -> %s\n" % (f, msg, m)) action.append((f, m) + args) action, copy = [], {} if overwrite: pa = p1 elif pa == p2: # backwards pa = p1.p1() elif pa and repo.ui.configbool("merge", "followcopies", True): copy, diverge, renamedelete = copies.mergecopies(repo, p1, p2, pa) for of, fl in diverge.iteritems(): act("divergent renames", "dr", of, fl) for of, fl in renamedelete.iteritems(): act("rename and delete", "rd", of, fl) repo.ui.note(_("resolving manifests\n")) repo.ui.debug(" overwrite: %s, partial: %s\n" % (bool(overwrite), bool(partial))) repo.ui.debug(" ancestor: %s, local: %s, remote: %s\n" % (pa, p1, p2)) m1, m2, ma = p1.manifest(), p2.manifest(), pa.manifest() copied = set(copy.values()) if '.hgsubstate' in m1: # check whether sub state is modified for s in p1.substate: if p1.sub(s).dirty(): m1['.hgsubstate'] += "+" break # Compare manifests for f, n in m1.iteritems(): if partial and not partial(f): continue if f in m2: rflags = fmerge(f, f, f) a = ma.get(f, nullid) if n == m2[f] or m2[f] == a: # same or local newer # is file locally modified or flags need changing? # dirstate flags may need to be made current if m1.flags(f) != rflags or n[20:]: act("update permissions", "e", f, rflags) elif n == a: # remote newer act("remote is newer", "g", f, rflags) else: # both changed act("versions differ", "m", f, f, f, rflags, False) elif f in copied: # files we'll deal with on m2 side pass elif f in copy: f2 = copy[f] if f2 not in m2: # directory rename act("remote renamed directory to " + f2, "d", f, None, f2, m1.flags(f)) else: # case 2 A,B/B/B or case 4,21 A/B/B act("local copied/moved to " + f2, "m", f, f2, f, fmerge(f, f2, f2), False) elif f in ma: # clean, a different, no remote if n != ma[f]: if repo.ui.promptchoice( _(" local changed %s which remote deleted\n" "use (c)hanged version or (d)elete?") % f, (_("&Changed"), _("&Delete")), 0): act("prompt delete", "r", f) else: act("prompt keep", "a", f) elif n[20:] == "a": # added, no remote act("remote deleted", "f", f) else: act("other deleted", "r", f) for f, n in m2.iteritems(): if partial and not partial(f): continue if f in m1 or f in copied: # files already visited continue if f in copy: f2 = copy[f] if f2 not in m1: # directory rename act("local renamed directory to " + f2, "d", None, f, f2, m2.flags(f)) elif f2 in m2: # rename case 1, A/A,B/A act("remote copied to " + f, "m", f2, f, f, fmerge(f2, f, f2), False) else: # case 3,20 A/B/A act("remote moved to " + f, "m", f2, f, f, fmerge(f2, f, f2), True) elif f not in ma: if (not overwrite and _checkunknownfile(repo, p1, p2, f)): rflags = fmerge(f, f, f) act("remote differs from untracked local", "m", f, f, f, rflags, False) else: act("remote created", "g", f, m2.flags(f)) elif n != ma[f]: if repo.ui.promptchoice( _("remote changed %s which local deleted\n" "use (c)hanged version or leave (d)eleted?") % f, (_("&Changed"), _("&Deleted")), 0) == 0: act("prompt recreating", "g", f, m2.flags(f)) return action def actionkey(a): return a[1] == 'r' and -1 or 0, a def applyupdates(repo, action, wctx, mctx, actx, overwrite): """apply the merge action list to the working directory wctx is the working copy context mctx is the context to be merged into the working copy actx is the context of the common ancestor Return a tuple of counts (updated, merged, removed, unresolved) that describes how many files were affected by the update. """ updated, merged, removed, unresolved = 0, 0, 0, 0 ms = mergestate(repo) ms.reset(wctx.p1().node()) moves = [] action.sort(key=actionkey) # prescan for merges for a in action: f, m = a[:2] if m == 'm': # merge f2, fd, flags, move = a[2:] if f == '.hgsubstate': # merged internally continue repo.ui.debug("preserving %s for resolve of %s\n" % (f, fd)) fcl = wctx[f] fco = mctx[f2] if mctx == actx: # backwards, use working dir parent as ancestor if fcl.parents(): fca = fcl.p1() else: fca = repo.filectx(f, fileid=nullrev) else: fca = fcl.ancestor(fco, actx) if not fca: fca = repo.filectx(f, fileid=nullrev) ms.add(fcl, fco, fca, fd, flags) if f != fd and move: moves.append(f) audit = scmutil.pathauditor(repo.root) # remove renamed files after safely stored for f in moves: if os.path.lexists(repo.wjoin(f)): repo.ui.debug("removing %s\n" % f) audit(f) os.unlink(repo.wjoin(f)) numupdates = len(action) for i, a in enumerate(action): f, m = a[:2] repo.ui.progress(_('updating'), i + 1, item=f, total=numupdates, unit=_('files')) if f and f[0] == "/": continue if m == "r": # remove repo.ui.note(_("removing %s\n") % f) audit(f) if f == '.hgsubstate': # subrepo states need updating subrepo.submerge(repo, wctx, mctx, wctx, overwrite) try: util.unlinkpath(repo.wjoin(f)) except OSError, inst: if inst.errno != errno.ENOENT: repo.ui.warn(_("update failed to remove %s: %s!\n") % (f, inst.strerror)) removed += 1 elif m == "m": # merge if f == '.hgsubstate': # subrepo states need updating subrepo.submerge(repo, wctx, mctx, wctx.ancestor(mctx), overwrite) continue f2, fd, flags, move = a[2:] repo.wopener.audit(fd) r = ms.resolve(fd, wctx, mctx) if r is not None and r > 0: unresolved += 1 else: if r is None: updated += 1 else: merged += 1 if (move and repo.dirstate.normalize(fd) != f and os.path.lexists(repo.wjoin(f))): repo.ui.debug("removing %s\n" % f) audit(f) os.unlink(repo.wjoin(f)) elif m == "g": # get flags = a[2] repo.ui.note(_("getting %s\n") % f) t = mctx.filectx(f).data() repo.wwrite(f, t, flags) t = None updated += 1 if f == '.hgsubstate': # subrepo states need updating subrepo.submerge(repo, wctx, mctx, wctx, overwrite) elif m == "d": # directory rename f2, fd, flags = a[2:] if f: repo.ui.note(_("moving %s to %s\n") % (f, fd)) audit(f) t = wctx.filectx(f).data() repo.wwrite(fd, t, flags) util.unlinkpath(repo.wjoin(f)) if f2: repo.ui.note(_("getting %s to %s\n") % (f2, fd)) t = mctx.filectx(f2).data() repo.wwrite(fd, t, flags) updated += 1 elif m == "dr": # divergent renames fl = a[2] repo.ui.warn(_("note: possible conflict - %s was renamed " "multiple times to:\n") % f) for nf in fl: repo.ui.warn(" %s\n" % nf) elif m == "rd": # rename and delete fl = a[2] repo.ui.warn(_("note: possible conflict - %s was deleted " "and renamed to:\n") % f) for nf in fl: repo.ui.warn(" %s\n" % nf) elif m == "e": # exec flags = a[2] repo.wopener.audit(f) util.setflags(repo.wjoin(f), 'l' in flags, 'x' in flags) ms.commit() repo.ui.progress(_('updating'), None, total=numupdates, unit=_('files')) return updated, merged, removed, unresolved def recordupdates(repo, action, branchmerge): "record merge actions to the dirstate" for a in action: f, m = a[:2] if m == "r": # remove if branchmerge: repo.dirstate.remove(f) else: repo.dirstate.drop(f) elif m == "a": # re-add if not branchmerge: repo.dirstate.add(f) elif m == "f": # forget repo.dirstate.drop(f) elif m == "e": # exec change repo.dirstate.normallookup(f) elif m == "g": # get if branchmerge: repo.dirstate.otherparent(f) else: repo.dirstate.normal(f) elif m == "m": # merge f2, fd, flag, move = a[2:] if branchmerge: # We've done a branch merge, mark this file as merged # so that we properly record the merger later repo.dirstate.merge(fd) if f != f2: # copy/rename if move: repo.dirstate.remove(f) if f != fd: repo.dirstate.copy(f, fd) else: repo.dirstate.copy(f2, fd) else: # We've update-merged a locally modified file, so # we set the dirstate to emulate a normal checkout # of that file some time in the past. Thus our # merge will appear as a normal local file # modification. if f2 == fd: # file not locally copied/moved repo.dirstate.normallookup(fd) if move: repo.dirstate.drop(f) elif m == "d": # directory rename f2, fd, flag = a[2:] if not f2 and f not in repo.dirstate: # untracked file moved continue if branchmerge: repo.dirstate.add(fd) if f: repo.dirstate.remove(f) repo.dirstate.copy(f, fd) if f2: repo.dirstate.copy(f2, fd) else: repo.dirstate.normal(fd) if f: repo.dirstate.drop(f) def update(repo, node, branchmerge, force, partial, ancestor=None, mergeancestor=False): """ Perform a merge between the working directory and the given node node = the node to update to, or None if unspecified branchmerge = whether to merge between branches force = whether to force branch merging or file overwriting partial = a function to filter file lists (dirstate not updated) mergeancestor = if false, merging with an ancestor (fast-forward) is only allowed between different named branches. This flag is used by rebase extension as a temporary fix and should be avoided in general. The table below shows all the behaviors of the update command given the -c and -C or no options, whether the working directory is dirty, whether a revision is specified, and the relationship of the parent rev to the target rev (linear, on the same named branch, or on another named branch). This logic is tested by test-update-branches.t. -c -C dirty rev | linear same cross n n n n | ok (1) x n n n y | ok ok ok n n y * | merge (2) (2) n y * * | --- discard --- y n y * | --- (3) --- y n n * | --- ok --- y y * * | --- (4) --- x = can't happen * = don't-care 1 = abort: crosses branches (use 'hg merge' or 'hg update -c') 2 = abort: crosses branches (use 'hg merge' to merge or use 'hg update -C' to discard changes) 3 = abort: uncommitted local changes 4 = incompatible options (checked in commands.py) Return the same tuple as applyupdates(). """ onode = node wlock = repo.wlock() try: wc = repo[None] if node is None: # tip of current branch try: node = repo.branchtip(wc.branch()) except error.RepoLookupError: if wc.branch() == "default": # no default branch! node = repo.lookup("tip") # update to tip else: raise util.Abort(_("branch %s not found") % wc.branch()) overwrite = force and not branchmerge pl = wc.parents() p1, p2 = pl[0], repo[node] if ancestor: pa = repo[ancestor] else: pa = p1.ancestor(p2) fp1, fp2, xp1, xp2 = p1.node(), p2.node(), str(p1), str(p2) ### check phase if not overwrite and len(pl) > 1: raise util.Abort(_("outstanding uncommitted merges")) if branchmerge: if pa == p2: raise util.Abort(_("merging with a working directory ancestor" " has no effect")) elif pa == p1: if not mergeancestor and p1.branch() == p2.branch(): raise util.Abort(_("nothing to merge"), hint=_("use 'hg update' " "or check 'hg heads'")) if not force and (wc.files() or wc.deleted()): raise util.Abort(_("outstanding uncommitted changes"), hint=_("use 'hg status' to list changes")) for s in wc.substate: if wc.sub(s).dirty(): raise util.Abort(_("outstanding uncommitted changes in " "subrepository '%s'") % s) elif not overwrite: if pa == p1 or pa == p2: # linear pass # all good elif wc.dirty(missing=True): raise util.Abort(_("crosses branches (merge branches or use" " --clean to discard changes)")) elif onode is None: raise util.Abort(_("crosses branches (merge branches or update" " --check to force update)")) else: # Allow jumping branches if clean and specific rev given pa = p1 ### calculate phase action = [] folding = not util.checkcase(repo.path) if folding: # collision check is not needed for clean update if (not branchmerge and (force or not wc.dirty(missing=True, branch=False))): _checkcollision(p2, None) else: _checkcollision(p2, wc) if not force: _checkunknown(repo, wc, p2) action += _forgetremoved(wc, p2, branchmerge) action += manifestmerge(repo, wc, p2, pa, overwrite, partial) ### apply phase if not branchmerge: # just jump to the new rev fp1, fp2, xp1, xp2 = fp2, nullid, xp2, '' if not partial: repo.hook('preupdate', throw=True, parent1=xp1, parent2=xp2) stats = applyupdates(repo, action, wc, p2, pa, overwrite) if not partial: repo.setparents(fp1, fp2) recordupdates(repo, action, branchmerge) if not branchmerge: repo.dirstate.setbranch(p2.branch()) finally: wlock.release() if not partial: repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3]) return stats