ref: 4088f72903121c5b39cd5ce9445b2fdb2783c4c1
dir: /sys/lib/python/mercurial/merge.py/
# merge.py - directory-level update/merge handling for Mercurial # # Copyright 2006, 2007 Matt Mackall <[email protected]> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2, incorporated herein by reference. from node import nullid, nullrev, hex, bin from i18n import _ import 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._read() def reset(self, node=None): self._state = {} if node: self._local = node shutil.rmtree(self._repo.join("merge"), True) def _read(self): self._state = {} try: localnode = None f = self._repo.opener("merge/state") for i, l in enumerate(f): if i == 0: localnode = l[:-1] else: bits = l[:-1].split("\0") self._state[bits[0]] = bits[1:] self._local = bin(localnode) except IOError, err: if err.errno != errno.ENOENT: raise def _write(self): 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") def add(self, fcl, fco, fca, fd, flags): hash = util.sha1(fcl.path()).hexdigest() self._repo.opener("merge/" + hash, "w").write(fcl.data()) self._state[fd] = ['u', hash, fcl.path(), fca.path(), hex(fca.filenode()), fco.path(), flags] self._write() 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._write() 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) 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 not r: self.mark(dfile, 'r') return r def _checkunknown(wctx, mctx): "check for collisions between unknown files and files in mctx" for f in wctx.unknown(): if f in mctx and mctx[f].cmp(wctx[f].data()): raise util.Abort(_("untracked file in working directory differs" " from file in requested revision: '%s'") % f) def _checkcollision(mctx): "check for case folding collisions in the destination context" folded = {} for fn in mctx: fold = fn.lower() if fold in folded: raise util.Abort(_("case-folding collision between %s and %s") % (fn, folded[fold])) folded[fold] = 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 ma 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 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): dirs = repo.ui.configbool("merge", "followdirs", True) copy, diverge = copies.copies(repo, p1, p2, pa, dirs) for of, fl in diverge.iteritems(): act("divergent renames", "dr", of, fl) repo.ui.note(_("resolving manifests\n")) repo.ui.debug(_(" overwrite %s partial %s\n") % (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()) # 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 if m1.flags(f) != rflags: 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) elif n[20:] != "u": 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: 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): "apply the merge action list to the working directory" updated, merged, removed, unresolved = 0, 0, 0, 0 ms = mergestate(repo) ms.reset(wctx.parents()[0].node()) moves = [] action.sort(key=actionkey) substate = wctx.substate # prime # 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] fca = fcl.ancestor(fco) or repo.filectx(f, fileid=nullrev) ms.add(fcl, fco, fca, fd, flags) if f != fd and move: moves.append(f) # remove renamed files after safely stored for f in moves: if util.lexists(repo.wjoin(f)): repo.ui.debug(_("removing %s\n") % f) os.unlink(repo.wjoin(f)) audit_path = util.path_auditor(repo.root) for a in action: f, m = a[:2] if f and f[0] == "/": continue if m == "r": # remove repo.ui.note(_("removing %s\n") % f) audit_path(f) if f == '.hgsubstate': # subrepo states need updating subrepo.submerge(repo, wctx, mctx, wctx) try: util.unlink(repo.wjoin(f)) except OSError, inst: if inst.errno != errno.ENOENT: repo.ui.warn(_("update failed to remove %s: %s!\n") % (f, inst.strerror)) removed += 1 elif m == "m": # merge if f == '.hgsubstate': # subrepo states need updating subrepo.submerge(repo, wctx, mctx, wctx.ancestor(mctx)) continue f2, fd, flags, move = a[2:] 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 util.set_flags(repo.wjoin(fd), 'l' in flags, 'x' in flags) if f != fd and move and util.lexists(repo.wjoin(f)): repo.ui.debug(_("removing %s\n") % 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) updated += 1 if f == '.hgsubstate': # subrepo states need updating subrepo.submerge(repo, wctx, mctx, wctx) elif m == "d": # directory rename f2, fd, flags = a[2:] if f: repo.ui.note(_("moving %s to %s\n") % (f, fd)) t = wctx.filectx(f).data() repo.wwrite(fd, t, flags) util.unlink(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(_("warning: detected divergent renames of %s to:\n") % f) for nf in fl: repo.ui.warn(" %s\n" % nf) elif m == "e": # exec flags = a[2] util.set_flags(repo.wjoin(f), 'l' in flags, 'x' in flags) 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.forget(f) elif m == "a": # re-add if not branchmerge: repo.dirstate.add(f) elif m == "f": # forget repo.dirstate.forget(f) elif m == "e": # exec change repo.dirstate.normallookup(f) elif m == "g": # get if branchmerge: repo.dirstate.normaldirty(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. repo.dirstate.normallookup(fd) if move: repo.dirstate.forget(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.forget(f) def update(repo, node, branchmerge, force, partial): """ Perform a merge between the working directory and the given node 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) """ wlock = repo.wlock() try: wc = repo[None] if node is None: # tip of current branch try: node = repo.branchtags()[wc.branch()] except KeyError: 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] pa = p1.ancestor(p2) fp1, fp2, xp1, xp2 = p1.node(), p2.node(), str(p1), str(p2) fastforward = False ### check phase if not overwrite and len(pl) > 1: raise util.Abort(_("outstanding uncommitted merges")) if branchmerge: if pa == p2: raise util.Abort(_("can't merge with ancestor")) elif pa == p1: if p1.branch() != p2.branch(): fastforward = True else: raise util.Abort(_("nothing to merge (use 'hg update'" " or check 'hg heads')")) if not force and (wc.files() or wc.deleted()): raise util.Abort(_("outstanding uncommitted changes " "(use 'hg status' to list changes)")) elif not overwrite: if pa == p1 or pa == p2: # linear pass # all good elif p1.branch() == p2.branch(): if wc.files() or wc.deleted(): raise util.Abort(_("crosses branches (use 'hg merge' or " "'hg update -C' to discard changes)")) raise util.Abort(_("crosses branches (use 'hg merge' " "or 'hg update -C')")) elif wc.files() or wc.deleted(): raise util.Abort(_("crosses named branches (use " "'hg update -C' to discard changes)")) else: # Allow jumping branches if there are no changes overwrite = True ### calculate phase action = [] if not force: _checkunknown(wc, p2) if not util.checkcase(repo.path): _checkcollision(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) if not partial: recordupdates(repo, action, branchmerge) repo.dirstate.setparents(fp1, fp2) if not branchmerge and not fastforward: repo.dirstate.setbranch(p2.branch()) repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3]) return stats finally: wlock.release()