merge: add a bit more sanity to divergent copy checks

mercurial/merge.py

@@ -1,685 +1,687 b''
 # merge.py - directory-level update/merge handling for Mercurial
 #
 # Copyright 2006, 2007 Matt Mackall <[e-mail]>
 #
 # 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 _
 import errno, util, os, tempfile, context, heapq
 
 def filemerge(repo, fw, fd, fo, wctx, mctx):
     """perform a 3-way merge in the working directory
 
     fw = original filename in the working directory
     fd = destination 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)
         data = repo.wwritedata(ctx.path(), ctx.data())
         f = os.fdopen(fd, "wb")
         f.write(data)
         f.close()
         return name
 
     fcm = wctx.filectx(fw)
     fcmdata = wctx.filectx(fd).data()
     fco = mctx.filectx(fo)
 
     if not fco.cmp(fcmdata): # files identical?
         return None
 
     fca = fcm.ancestor(fco)
     if not fca:
         fca = repo.filectx(fw, fileid=nullrev)
     a = repo.wjoin(fd)
     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': fd,
                              'HG_MY_NODE': str(wctx.parents()[0]),
                              'HG_OTHER_NODE': str(mctx),
                              'HG_MY_ISLINK': fcm.islink(),
                              'HG_OTHER_ISLINK': fco.islink(),
                              'HG_BASE_ISLINK': fca.islink(),})
     if r:
         repo.ui.warn(_("merging %s failed!\n") % fd)
 
     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 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.manifest():
         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):
     """
     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 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 dirname(f):
         s = f.rfind("/")
         if s == -1:
             return ""
         return f[:s]
 
     def dirs(files):
         d = {}
         for f in files:
             f = dirname(f)
             while f not in d:
                 d[f] = True
                 f = dirname(f)
         return d
 
     wctx = repo.workingctx()
 
     def makectx(f, n):
         if len(n) == 20:
             return repo.filectx(f, fileid=n)
         return wctx.filectx(f)
     ctx = util.cachefunc(makectx)
 
     def findold(fctx):
         "find files that path was copied from, back to linkrev limit"
         old = {}
         seen = {}
         orig = fctx.path()
         visit = [fctx]
         while visit:
             fc = visit.pop()
             s = str(fc)
             if s in seen:
                 continue
             seen[s] = 1
             if fc.path() != orig and fc.path() not in old:
                 old[fc.path()] = 1
             if fc.rev() < limit:
                 continue
             visit += fc.parents()
 
         old = old.keys()
         old.sort()
         return old
 
     copy = {}
     fullcopy = {}
     diverge = {}
 
     def checkcopies(c, man, aman):
         '''check possible copies for filectx c'''
         for of in findold(c):
             fullcopy[c.path()] = of # remember for dir rename detection
             if of not in man: # original file not in other manifest?
                 if of in ma:
                     diverge.setdefault(of, []).append(c.path())
                 continue
             # if the original file is unchanged on the other branch,
             # no merge needed
             if man[of] == aman.get(of):
                 continue
             c2 = ctx(of, man[of])
             ca = c.ancestor(c2)
             if not ca: # unrelated?
                 continue
             # named changed on only one side?
             if ca.path() == c.path() or ca.path() == c2.path():
                 if c == ca and c2 == ca: # no merge needed, ignore copy
                     continue
                 copy[c.path()] = of
 
     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 {}, {}
 
     repo.ui.debug(_("  searching for copies back to rev %d\n") % limit)
 
     u1 = nonoverlap(m1, m2, ma)
     u2 = nonoverlap(m2, m1, ma)
 
     if u1:
         repo.ui.debug(_("  unmatched files in local:\n   %s\n")
                       % "\n   ".join(u1))
     if u2:
         repo.ui.debug(_("  unmatched files in other:\n   %s\n")
                       % "\n   ".join(u2))
 
     for f in u1:
         checkcopies(ctx(f, m1[f]), m2, ma)
 
     for f in u2:
         checkcopies(ctx(f, m2[f]), m1, ma)
 
-    d2 = {}
+    diverge2 = {}
     for of, fl in diverge.items():
-        for f in fl:
-            fo = list(fl)
-            fo.remove(f)
-            d2[f] = (of, fo)
+        if len(fl) == 1:
+            del diverge[of] # not actually divergent
+        else:
+            diverge2.update(dict.fromkeys(fl)) # reverse map for below
 
     if fullcopy:
         repo.ui.debug(_("  all copies found (* = to merge, ! = divergent):\n"))
         for f in fullcopy:
             note = ""
             if f in copy: note += "*"
-            if f in diverge: note += "!"
+            if f in diverge2: note += "!"
             repo.ui.debug(_("   %s -> %s %s\n") % (f, fullcopy[f], note))
 
+    del diverge2
+
     if not fullcopy or not repo.ui.configbool("merge", "followdirs", True):
         return copy, diverge
 
     repo.ui.debug(_("  checking for directory renames\n"))
 
     # generate a directory move map
     d1, d2 = dirs(m1), dirs(m2)
     invalid = {}
     dirmove = {}
 
     # examine each file copy for a potential directory move, which is
     # when all the files in a directory are moved to a new directory
     for dst, src in fullcopy.items():
         dsrc, ddst = dirname(src), dirname(dst)
         if dsrc in invalid:
             # already seen to be uninteresting
             continue
         elif dsrc in d1 and ddst in d1:
             # directory wasn't entirely moved locally
             invalid[dsrc] = True
         elif dsrc in d2 and ddst in d2:
             # directory wasn't entirely moved remotely
             invalid[dsrc] = True
         elif dsrc in dirmove and dirmove[dsrc] != ddst:
             # files from the same directory moved to two different places
             invalid[dsrc] = True
         else:
             # looks good so far
             dirmove[dsrc + "/"] = ddst + "/"
 
     for i in invalid:
         if i in dirmove:
             del dirmove[i]
 
     del d1, d2, invalid
 
     if not dirmove:
         return copy, diverge
 
     for d in dirmove:
         repo.ui.debug(_("  dir %s -> %s\n") % (d, dirmove[d]))
 
     # check unaccounted nonoverlapping files against directory moves
     for f in u1 + u2:
         if f not in fullcopy:
             for d in dirmove:
                 if f.startswith(d):
                     # new file added in a directory that was moved, move it
                     copy[f] = dirmove[d] + f[len(d):]
                     repo.ui.debug(_("  file %s -> %s\n") % (f, copy[f]))
                     break
 
     return copy, diverge
 
 def symmetricdifference(repo, rev1, rev2):
     """symmetric difference of the sets of ancestors of rev1 and rev2
 
     I.e. revisions that are ancestors of rev1 or rev2, but not both.
     """
     # basic idea:
     # - mark rev1 and rev2 with different colors
     # - walk the graph in topological order with the help of a heap;
     #   for each revision r:
     #     - if r has only one color, we want to return it
     #     - add colors[r] to its parents
     #
     # We keep track of the number of revisions in the heap that
     # we may be interested in.  We stop walking the graph as soon
     # as this number reaches 0.
     WHITE = 1
     BLACK = 2
     ALLCOLORS = WHITE | BLACK
     colors = {rev1: WHITE, rev2: BLACK}
 
     cl = repo.changelog
 
     visit = [-rev1, -rev2]
     heapq.heapify(visit)
     n_wanted = len(visit)
     ret = []
 
     while n_wanted:
         r = -heapq.heappop(visit)
         wanted = colors[r] != ALLCOLORS
         n_wanted -= wanted
         if wanted:
             ret.append(r)
 
         for p in cl.parentrevs(r):
             if p == nullrev:
                 continue
             if p not in colors:
                 # first time we see p; add it to visit
                 n_wanted += wanted
                 colors[p] = colors[r]
                 heapq.heappush(visit, -p)
             elif colors[p] != ALLCOLORS and colors[p] != colors[r]:
                 # at first we thought we wanted p, but now
                 # we know we don't really want it
                 n_wanted -= 1
                 colors[p] |= colors[r]
 
         del colors[r]
 
     return ret
 
 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 = {}
     diverge = {}
 
     def fmerge(f, f2=None, fa=None):
         """merge flags"""
         if not f2:
             f2 = f
             fa = f
         a, m, n = ma.flags(fa), m1.flags(f), m2.flags(f2)
         if m == n: # flags agree
             return m # unchanged
         if m and n: # flags are set but don't agree
             if not a: # both differ from parent
                 r = repo.ui.prompt(
                     _(" conflicting flags for %s\n"
                       "(n)one, e(x)ec or sym(l)ink?") % f, "[nxl]", "n")
                 return r != "n" and r or ''
             if m == a:
                 return n # changed from m to n
             return m # changed from n to m
         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)
 
     if not (backwards or overwrite):
         rev1 = p1.rev()
         if rev1 is None:
             # p1 is a workingctx
             rev1 = p1.parents()[0].rev()
         limit = min(symmetricdifference(repo, rev1, p2.rev()))
         copy, diverge = findcopies(repo, m1, m2, ma, limit)
 
     for of, fl in diverge.items():
         act("divergent renames", "dr", of, fl)
 
     copied = dict.fromkeys(copy.values())
 
     # Compare manifests
     for f, n in m1.iteritems():
         if partial and not partial(f):
             continue
         if f in m2:
             if overwrite or backwards:
                 rflags = m2.flags(f)
             else:
                 rflags = fmerge(f)
             # are files different?
             if n != m2[f]:
                 a = ma.get(f, nullid)
                 # are we clobbering?
                 if overwrite:
                     act("clobbering", "g", f, rflags)
                 # or are we going back in time and clean?
                 elif backwards and not n[20:]:
                     act("reverting", "g", f, rflags)
                 # are both different from the ancestor?
                 elif n != a and m2[f] != a:
                     act("versions differ", "m", f, f, f, rflags, False)
                 # is remote's version newer?
                 elif m2[f] != a:
                     act("remote is newer", "g", f, rflags)
                 # local is newer, not overwrite, check mode bits
                 elif m1.flags(f) != rflags:
                     act("update permissions", "e", f, rflags)
             # contents same, check mode bits
             elif m1.flags(f) != rflags:
                 act("update permissions", "e", f, rflags)
         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.flags(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"
                       "use (c)hanged version or (d)elete?") % f,
                     _("[cd]"), _("c")) == _("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.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 in ma:
             if overwrite or backwards:
                 act("recreating", "g", f, m2.flags(f))
             elif n != ma[f]:
                 if repo.ui.prompt(
                     _("remote changed %s which local deleted\n"
                       "use (c)hanged version or leave (d)eleted?") % f,
                     _("[cd]"), _("c")) == _("c"):
                     act("prompt recreating", "g", f, m2.flags(f))
         else:
             act("remote created", "g", f, m2.flags(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()
     # prescan for copy/renames
     for a in action:
         f, m = a[:2]
         if m == 'm': # merge
             f2, fd, flags, move = a[2:]
             if f != fd:
                 repo.ui.debug(_("copying %s to %s\n") % (f, fd))
                 repo.wwrite(fd, repo.wread(f), flags)
 
     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)
             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, flags, move = a[2:]
             r = filemerge(repo, f, fd, f2, wctx, mctx)
             if r > 0:
                 unresolved += 1
             else:
                 if r is None:
                     updated += 1
                 else:
                     merged += 1
             util.set_flags(repo.wjoin(fd), 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
         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), 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 == "f": # forget
             repo.dirstate.forget(f)
         elif m in "ge": # get or exec change
             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.workingctx()
         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
         forcemerge = force and branchmerge
         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)
         fastforward = False
 
         ### 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:
                 if p1.branch() != p2.branch() and pa != p2:
                     fastforward = True
                 else:
                     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 util.checkfolding(repo.path):
             checkcollision(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)
             if not branchmerge and not fastforward:
                 repo.dirstate.setbranch(p2.branch())
             repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3])
 
         return stats
     finally:
         del wlock

tests/test-rename-merge1.out

@@ -1,40 +1,40 b''
 checkout
 2 files updated, 0 files merged, 2 files removed, 0 files unresolved
 merge
 resolving manifests
  overwrite None partial False
  ancestor af1939970a1c local f26ec4fc3fa3+ remote 8e765a822af2
   searching for copies back to rev 1
   unmatched files in local:
    c2
   unmatched files in other:
    b
    b2
   all copies found (* = to merge, ! = divergent):
-   c2 -> a2 
+   c2 -> a2 !
    b -> a *
-   b2 -> a2 
+   b2 -> a2 !
   checking for directory renames
  a2: divergent renames -> dr
  a: remote moved to b -> m
  b2: remote created -> g
 copying a to b
 merging a and b
 my a@f26ec4fc3fa3+ other b@8e765a822af2 ancestor a@af1939970a1c
 removing a
 warning: detected divergent renames of a2 to:
  c2
  b2
 getting b2
 1 files updated, 1 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 M b
   a
 M b2
 R a
 C c2
 blahblah
    rev    offset  length   base linkrev nodeid       p1           p2
      0         0      67      0       1 dc51707dfc98 000000000000 000000000000
      1        67      72      1       3 b2494a44f0a9 000000000000 dc51707dfc98
 b renamed from a:dd03b83622e78778b403775d0d074b9ac7387a66

tests/test-rename-merge2.out

@@ -1,499 +1,499 b''
 --------------
 test L:up a   R:nc a b W:       - 1  get local a to b
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local e300d1c794ec+ remote 735846fee2d7
   searching for copies back to rev 1
   unmatched files in other:
    b
   all copies found (* = to merge, ! = divergent):
    b -> a *
   checking for directory renames
  rev: versions differ -> m
  a: remote copied to b -> m
 copying a to b
 merging a and b
 my a@e300d1c794ec+ other b@735846fee2d7 ancestor a@924404dff337
 merging rev
 my rev@e300d1c794ec+ other rev@735846fee2d7 ancestor rev@924404dff337
 0 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
   a
 C a
 --------------
 
 --------------
 test L:nc a b R:up a   W:       - 2  get rem change to a and b
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local ac809aeed39a+ remote f4db7e329e71
   searching for copies back to rev 1
   unmatched files in local:
    b
   all copies found (* = to merge, ! = divergent):
    b -> a *
   checking for directory renames
  a: remote is newer -> g
  b: local copied to a -> m
  rev: versions differ -> m
 getting a
 merging b and a
 my b@ac809aeed39a+ other a@f4db7e329e71 ancestor a@924404dff337
 merging rev
 my rev@ac809aeed39a+ other rev@f4db7e329e71 ancestor rev@924404dff337
 1 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M a
 M b
   a
 --------------
 
 --------------
 test L:up a   R:nm a b W:       - 3  get local a change to b, remove a
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local e300d1c794ec+ remote e03727d2d66b
   searching for copies back to rev 1
   unmatched files in other:
    b
   all copies found (* = to merge, ! = divergent):
    b -> a *
   checking for directory renames
  rev: versions differ -> m
  a: remote moved to b -> m
 copying a to b
 merging a and b
 my a@e300d1c794ec+ other b@e03727d2d66b ancestor a@924404dff337
 removing a
 merging rev
 my rev@e300d1c794ec+ other rev@e03727d2d66b ancestor rev@924404dff337
 0 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
   a
 --------------
 
 --------------
 test L:nm a b R:up a   W:       - 4  get remote change to b
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local ecf3cb2a4219+ remote f4db7e329e71
   searching for copies back to rev 1
   unmatched files in local:
    b
   all copies found (* = to merge, ! = divergent):
    b -> a *
   checking for directory renames
  b: local moved to a -> m
  rev: versions differ -> m
 merging b and a
 my b@ecf3cb2a4219+ other a@f4db7e329e71 ancestor a@924404dff337
 merging rev
 my rev@ecf3cb2a4219+ other rev@f4db7e329e71 ancestor rev@924404dff337
 0 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
   a
 --------------
 
 --------------
 test L:       R:nc a b W:       - 5  get b
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local 94b33a1b7f2d+ remote 735846fee2d7
   searching for copies back to rev 1
   unmatched files in other:
    b
   all copies found (* = to merge, ! = divergent):
    b -> a 
   checking for directory renames
  rev: versions differ -> m
  b: remote created -> g
 getting b
 merging rev
 my rev@94b33a1b7f2d+ other rev@735846fee2d7 ancestor rev@924404dff337
 1 files updated, 1 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
 C a
 --------------
 
 --------------
 test L:nc a b R:       W:       - 6  nothing
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local ac809aeed39a+ remote 97c705ade336
   searching for copies back to rev 1
   unmatched files in local:
    b
   all copies found (* = to merge, ! = divergent):
    b -> a 
   checking for directory renames
  rev: versions differ -> m
 merging rev
 my rev@ac809aeed39a+ other rev@97c705ade336 ancestor rev@924404dff337
 0 files updated, 1 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 C a
 C b
 --------------
 
 --------------
 test L:       R:nm a b W:       - 7  get b
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local 94b33a1b7f2d+ remote e03727d2d66b
   searching for copies back to rev 1
   unmatched files in other:
    b
   all copies found (* = to merge, ! = divergent):
    b -> a 
   checking for directory renames
  a: other deleted -> r
  rev: versions differ -> m
  b: remote created -> g
 removing a
 getting b
 merging rev
 my rev@94b33a1b7f2d+ other rev@e03727d2d66b ancestor rev@924404dff337
 1 files updated, 1 files merged, 1 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
 --------------
 
 --------------
 test L:nm a b R:       W:       - 8  nothing
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local ecf3cb2a4219+ remote 97c705ade336
   searching for copies back to rev 1
   unmatched files in local:
    b
   all copies found (* = to merge, ! = divergent):
    b -> a 
   checking for directory renames
  rev: versions differ -> m
 merging rev
 my rev@ecf3cb2a4219+ other rev@97c705ade336 ancestor rev@924404dff337
 0 files updated, 1 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 C b
 --------------
 
 --------------
 test L:um a b R:um a b W:       - 9  do merge with ancestor in a
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local ec03c2ca8642+ remote 79cc6877a3b7
   searching for copies back to rev 1
  b: versions differ -> m
  rev: versions differ -> m
 merging b
 my b@ec03c2ca8642+ other b@79cc6877a3b7 ancestor a@924404dff337
 merging rev
 my rev@ec03c2ca8642+ other rev@79cc6877a3b7 ancestor rev@924404dff337
 0 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
 --------------
 
 --------------
 test L:nm a b R:nm a c W:       - 11 get c, keep b
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local ecf3cb2a4219+ remote e6abcc1a30c2
   searching for copies back to rev 1
   unmatched files in local:
    b
   unmatched files in other:
    c
   all copies found (* = to merge, ! = divergent):
-   c -> a 
-   b -> a 
+   c -> a !
+   b -> a !
   checking for directory renames
  a: divergent renames -> dr
  rev: versions differ -> m
  c: remote created -> g
 warning: detected divergent renames of a to:
  b
  c
 getting c
 merging rev
 my rev@ecf3cb2a4219+ other rev@e6abcc1a30c2 ancestor rev@924404dff337
 1 files updated, 1 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M c
 C b
 --------------
 
 --------------
 test L:nc a b R:up b   W:       - 12 merge b no ancestor
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local ac809aeed39a+ remote af30c7647fc7
   searching for copies back to rev 1
  b: versions differ -> m
  rev: versions differ -> m
 merging b
 my b@ac809aeed39a+ other b@af30c7647fc7 ancestor b@000000000000
 merging rev
 my rev@ac809aeed39a+ other rev@af30c7647fc7 ancestor rev@924404dff337
 0 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
 C a
 --------------
 
 --------------
 test L:up b   R:nm a b W:       - 13 merge b no ancestor
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local 59318016310c+ remote e03727d2d66b
   searching for copies back to rev 1
  a: other deleted -> r
  b: versions differ -> m
  rev: versions differ -> m
 removing a
 merging b
 my b@59318016310c+ other b@e03727d2d66b ancestor b@000000000000
 merging rev
 my rev@59318016310c+ other rev@e03727d2d66b ancestor rev@924404dff337
 0 files updated, 2 files merged, 1 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
 --------------
 
 --------------
 test L:nc a b R:up a b W:       - 14 merge b no ancestor
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local ac809aeed39a+ remote 8dbce441892a
   searching for copies back to rev 1
  a: remote is newer -> g
  b: versions differ -> m
  rev: versions differ -> m
 getting a
 merging b
 my b@ac809aeed39a+ other b@8dbce441892a ancestor b@000000000000
 merging rev
 my rev@ac809aeed39a+ other rev@8dbce441892a ancestor rev@924404dff337
 1 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M a
 M b
 --------------
 
 --------------
 test L:up b   R:nm a b W:       - 15 merge b no ancestor, remove a
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local 59318016310c+ remote e03727d2d66b
   searching for copies back to rev 1
  a: other deleted -> r
  b: versions differ -> m
  rev: versions differ -> m
 removing a
 merging b
 my b@59318016310c+ other b@e03727d2d66b ancestor b@000000000000
 merging rev
 my rev@59318016310c+ other rev@e03727d2d66b ancestor rev@924404dff337
 0 files updated, 2 files merged, 1 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
 --------------
 
 --------------
 test L:nc a b R:up a b W:       - 16 get a, merge b no ancestor
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local ac809aeed39a+ remote 8dbce441892a
   searching for copies back to rev 1
  a: remote is newer -> g
  b: versions differ -> m
  rev: versions differ -> m
 getting a
 merging b
 my b@ac809aeed39a+ other b@8dbce441892a ancestor b@000000000000
 merging rev
 my rev@ac809aeed39a+ other rev@8dbce441892a ancestor rev@924404dff337
 1 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M a
 M b
 --------------
 
 --------------
 test L:up a b R:nc a b W:       - 17 keep a, merge b no ancestor
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local 0b76e65c8289+ remote 735846fee2d7
   searching for copies back to rev 1
  b: versions differ -> m
  rev: versions differ -> m
 merging b
 my b@0b76e65c8289+ other b@735846fee2d7 ancestor b@000000000000
 merging rev
 my rev@0b76e65c8289+ other rev@735846fee2d7 ancestor rev@924404dff337
 0 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
 C a
 --------------
 
 --------------
 test L:nm a b R:up a b W:       - 18 merge b no ancestor
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local ecf3cb2a4219+ remote 8dbce441892a
   searching for copies back to rev 1
  b: versions differ -> m
  rev: versions differ -> m
  a: prompt recreating -> g
 getting a
 merging b
 my b@ecf3cb2a4219+ other b@8dbce441892a ancestor b@000000000000
 merging rev
 my rev@ecf3cb2a4219+ other rev@8dbce441892a ancestor rev@924404dff337
 1 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M a
 M b
 --------------
 
 --------------
 test L:up a b R:nm a b W:       - 19 merge b no ancestor, prompt remove a
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local 0b76e65c8289+ remote e03727d2d66b
   searching for copies back to rev 1
  b: versions differ -> m
  rev: versions differ -> m
 merging b
 my b@0b76e65c8289+ other b@e03727d2d66b ancestor b@000000000000
 merging rev
 my rev@0b76e65c8289+ other rev@e03727d2d66b ancestor rev@924404dff337
 0 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
 C a
 --------------
 
 --------------
 test L:up a   R:um a b W:       - 20 merge a and b to b, remove a
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local e300d1c794ec+ remote 79cc6877a3b7
   searching for copies back to rev 1
   unmatched files in other:
    b
   all copies found (* = to merge, ! = divergent):
    b -> a *
   checking for directory renames
  rev: versions differ -> m
  a: remote moved to b -> m
 copying a to b
 merging a and b
 my a@e300d1c794ec+ other b@79cc6877a3b7 ancestor a@924404dff337
 removing a
 merging rev
 my rev@e300d1c794ec+ other rev@79cc6877a3b7 ancestor rev@924404dff337
 0 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
   a
 --------------
 
 --------------
 test L:um a b R:up a   W:       - 21 merge a and b to b
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local ec03c2ca8642+ remote f4db7e329e71
   searching for copies back to rev 1
   unmatched files in local:
    b
   all copies found (* = to merge, ! = divergent):
    b -> a *
   checking for directory renames
  b: local moved to a -> m
  rev: versions differ -> m
 merging b and a
 my b@ec03c2ca8642+ other a@f4db7e329e71 ancestor a@924404dff337
 merging rev
 my rev@ec03c2ca8642+ other rev@f4db7e329e71 ancestor rev@924404dff337
 0 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
   a
 --------------
 
 --------------
 test L:nm a b R:up a c W:       - 23 get c, keep b
 --------------
 resolving manifests
  overwrite None partial False
  ancestor 924404dff337 local ecf3cb2a4219+ remote 2b958612230f
   searching for copies back to rev 1
   unmatched files in local:
    b
   unmatched files in other:
    c
   all copies found (* = to merge, ! = divergent):
    b -> a *
   checking for directory renames
  b: local moved to a -> m
  rev: versions differ -> m
  c: remote created -> g
 merging b and a
 my b@ecf3cb2a4219+ other a@2b958612230f ancestor a@924404dff337
 getting c
 merging rev
 my rev@ecf3cb2a4219+ other rev@2b958612230f ancestor rev@924404dff337
 1 files updated, 2 files merged, 0 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 --------------
 M b
   a
 M c
 --------------