# merge.py - directory-level update/merge handling for Mercurial # # Copyright 2006 Matt Mackall # # This software may be used and distributed according to the terms # of the GNU General Public License, incorporated herein by reference. from node import * from i18n import gettext as _ from demandload import * demandload(globals(), "errno util os tempfile") def filemerge(repo, fw, fo, wctx, mctx): """perform a 3-way merge in the working directory fw = filename in the working directory fo = filename in other parent wctx, mctx = working and merge changecontexts """ def temp(prefix, ctx): pre = "%s~%s." % (os.path.basename(ctx.path()), prefix) (fd, name) = tempfile.mkstemp(prefix=pre) f = os.fdopen(fd, "wb") repo.wwrite(ctx.path(), ctx.data(), f) f.close() return name fcm = wctx.filectx(fw) fco = mctx.filectx(fo) if not fco.cmp(fcm.data()): # files identical? return None fca = fcm.ancestor(fco) if not fca: fca = repo.filectx(fw, fileid=nullrev) a = repo.wjoin(fw) b = temp("base", fca) c = temp("other", fco) if fw != fo: repo.ui.status(_("merging %s and %s\n") % (fw, fo)) else: repo.ui.status(_("merging %s\n") % fw) repo.ui.debug(_("my %s other %s ancestor %s\n") % (fcm, fco, fca)) cmd = (os.environ.get("HGMERGE") or repo.ui.config("ui", "merge") or "hgmerge") r = util.system('%s "%s" "%s" "%s"' % (cmd, a, b, c), cwd=repo.root, environ={'HG_FILE': fw, 'HG_MY_NODE': str(wctx.parents()[0]), 'HG_OTHER_NODE': str(mctx)}) if r: repo.ui.warn(_("merging %s failed!\n") % fw) os.unlink(b) os.unlink(c) return r def checkunknown(wctx, mctx): "check for collisions between unknown files and files in mctx" man = mctx.manifest() for f in wctx.unknown(): if f in man: if mctx.filectx(f).cmp(wctx.filectx(f).data()): raise util.Abort(_("untracked local file '%s' differs"\ " from remote version") % f) def forgetremoved(wctx, mctx): """ 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. """ action = [] man = mctx.manifest() for f in wctx.deleted() + wctx.removed(): if f not in man: action.append((f, "f")) return action def findcopies(repo, m1, m2, ma, limit): """ Find moves and copies between m1 and m2 back to limit linkrev """ def findold(fctx): "find files that path was copied from, back to linkrev limit" old = {} orig = fctx.path() visit = [fctx] while visit: fc = visit.pop() if fc.rev() < limit: continue if fc.path() != orig and fc.path() not in old: old[fc.path()] = 1 visit += fc.parents() old = old.keys() old.sort() return old def nonoverlap(d1, d2, d3): "Return list of elements in d1 not in d2 or d3" l = [d for d in d1 if d not in d3 and d not in d2] l.sort() return l def checkcopies(c, man): '''check possible copies for filectx c''' for of in findold(c): if of not in man: return c2 = ctx(of, man[of]) ca = c.ancestor(c2) if not ca: # unrelated return if ca.path() == c.path() or ca.path() == c2.path(): fullcopy[c.path()] = of if c == ca or c2 == ca: # no merge needed, ignore copy return copy[c.path()] = of def dirs(files): d = {} for f in files: d[os.path.dirname(f)] = True return d if not repo.ui.configbool("merge", "followcopies", True): return {} # avoid silly behavior for update from empty dir if not m1 or not m2 or not ma: return {} dcopies = repo.dirstate.copies() copy = {} fullcopy = {} u1 = nonoverlap(m1, m2, ma) u2 = nonoverlap(m2, m1, ma) ctx = util.cachefunc(lambda f, n: repo.filectx(f, fileid=n[:20])) for f in u1: checkcopies(ctx(dcopies.get(f, f), m1[f]), m2) for f in u2: checkcopies(ctx(f, m2[f]), m1) if not fullcopy or not repo.ui.configbool("merge", "followdirs", True): return copy # generate a directory move map d1, d2 = dirs(m1), dirs(m2) invalid = {} dirmove = {} for dst, src in fullcopy.items(): dsrc, ddst = os.path.dirname(src), os.path.dirname(dst) if dsrc in invalid: continue elif (dsrc in d1 and ddst in d1) or (dsrc in d2 and ddst in d2): invalid[dsrc] = True elif dsrc in dirmove and dirmove[dsrc] != ddst: invalid[dsrc] = True del dirmove[dsrc] else: dirmove[dsrc] = ddst del d1, d2, invalid if not dirmove: return copy # check unaccounted nonoverlapping files for f in u1 + u2: if f not in fullcopy: d = os.path.dirname(f) if d in dirmove: copy[f] = dirmove[d] + "/" + os.path.basename(f) return copy 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 """ 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 = p1.manifest() m2 = p2.manifest() ma = pa.manifest() backwards = (pa == p2) action = [] copy = {} def fmerge(f, f2=None, fa=None): """merge executable flags""" if not f2: f2 = f fa = f a, b, c = ma.execf(fa), m1.execf(f), m2.execf(f2) return ((a^b) | (a^c)) ^ a def act(msg, m, f, *args): repo.ui.debug(" %s: %s -> %s\n" % (f, msg, m)) action.append((f, m) + args) if not (backwards or overwrite): copy = findcopies(repo, m1, m2, ma, pa.rev()) copied = dict.fromkeys(copy.values()) # Compare manifests for f, n in m1.iteritems(): if partial and not partial(f): continue if f in m2: # are files different? if n != m2[f]: a = ma.get(f, nullid) # are both different from the ancestor? if not overwrite and n != a and m2[f] != a: act("versions differ", "m", f, f, f, fmerge(f), False) # are we clobbering? # is remote's version newer? # or are we going back in time and clean? elif overwrite or m2[f] != a or (backwards and not n[20:]): act("remote is newer", "g", f, m2.execf(f)) # local is newer, not overwrite, check mode bits elif fmerge(f) != m1.execf(f): act("update permissions", "e", f, m2.execf(f)) # contents same, check mode bits elif m1.execf(f) != m2.execf(f): if overwrite or fmerge(f) != m1.execf(f): act("update permissions", "e", f, m2.execf(f)) elif f in copied: continue 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.execf(f)) elif f2 in m1: # case 2 A,B/B/B act("local copied to " + f2, "m", f, f2, f, fmerge(f, f2, f2), False) else: # case 4,21 A/B/B act("local moved to " + f2, "m", f, f2, f, fmerge(f, f2, f2), False) elif f in ma: if n != ma[f] and not overwrite: if repo.ui.prompt( (_(" local changed %s which remote deleted\n") % f) + _("(k)eep or (d)elete?"), _("[kd]"), _("k")) == _("d"): act("prompt delete", "r", f) else: act("other deleted", "r", f) else: # file is created on branch or in working directory if (overwrite and n[20:] != "u") or (backwards and not n[20:]): act("remote deleted", "r", f) for f, n in m2.iteritems(): if partial and not partial(f): continue if f in m1: continue if f in copied: 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.execf(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 in ma: if overwrite or backwards: act("recreating", "g", f, m2.execf(f)) elif n != ma[f]: if repo.ui.prompt( (_("remote changed %s which local deleted\n") % f) + _("(k)eep or (d)elete?"), _("[kd]"), _("k")) == _("k"): act("prompt recreating", "g", f, m2.execf(f)) else: act("remote created", "g", f, m2.execf(f)) return action def applyupdates(repo, action, wctx, mctx): "apply the merge action list to the working directory" updated, merged, removed, unresolved = 0, 0, 0, 0 action.sort() 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) util.audit_path(f) 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 f2, fd, flag, move = a[2:] r = filemerge(repo, f, f2, wctx, mctx) if r > 0: unresolved += 1 else: if r is None: updated += 1 else: merged += 1 if f != fd: repo.ui.debug(_("copying %s to %s\n") % (f, fd)) repo.wwrite(fd, repo.wread(f)) if move: repo.ui.debug(_("removing %s\n") % f) os.unlink(repo.wjoin(f)) util.set_exec(repo.wjoin(fd), flag) elif m == "g": # get flag = a[2] repo.ui.note(_("getting %s\n") % f) t = mctx.filectx(f).data() repo.wwrite(f, t) util.set_exec(repo.wjoin(f), flag) updated += 1 elif m == "d": # directory rename f2, fd, flag = a[2:] if f: repo.ui.note(_("moving %s to %s\n") % (f, fd)) t = wctx.filectx(f).data() repo.wwrite(fd, t) util.set_exec(repo.wjoin(fd), flag) 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) util.set_exec(repo.wjoin(fd), flag) updated += 1 elif m == "e": # exec flag = a[2] util.set_exec(repo.wjoin(f), flag) 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.update([f], 'r') else: repo.dirstate.forget([f]) elif m == "f": # forget repo.dirstate.forget([f]) elif m == "g": # get if branchmerge: repo.dirstate.update([f], 'n', st_mtime=-1) else: repo.dirstate.update([f], 'n') 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.update([fd], 'm') if f != f2: # copy/rename if move: repo.dirstate.update([f], 'r') 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.update([fd], 'n', st_size=-1, st_mtime=-1) if move: repo.dirstate.forget([f]) elif m == "d": # directory rename f2, fd, flag = a[2:] if branchmerge: repo.dirstate.update([fd], 'a') if f: repo.dirstate.update([f], 'r') repo.dirstate.copy(f, fd) if f2: repo.dirstate.copy(f2, fd) else: repo.dirstate.update([fd], 'n') if f: repo.dirstate.forget([f]) def update(repo, node, branchmerge, force, partial, wlock): """ 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 = working dir lock, if already held """ if not wlock: wlock = repo.wlock() overwrite = force and not branchmerge forcemerge = force and branchmerge wc = repo.workingctx() pl = wc.parents() p1, p2 = pl[0], repo.changectx(node) 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 pa == p1 or pa == p2: # is there a linear path from p1 to p2? if branchmerge: raise util.Abort(_("there is nothing to merge, just use " "'hg update' or look at 'hg heads'")) elif not (overwrite or branchmerge): raise util.Abort(_("update spans branches, use 'hg merge' " "or 'hg update -C' to lose changes")) if branchmerge and not forcemerge: if wc.files(): raise util.Abort(_("outstanding uncommitted changes")) ### calculate phase action = [] if not force: checkunknown(wc, p2) if not branchmerge: action += forgetremoved(wc, p2) 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) repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3]) if not branchmerge: repo.opener("branch", "w").write(p2.branch() + "\n") return stats