checkheads: check successors for new heads in both missing and common

A relevant obsolete marker may have been added -after- we previously
exchanged the changeset. We have to search for remote heads that
disappear by the sole fact of pushing obsolescence.

This case will also happen when remote got the new version from a
repository that does not propagate obsolescence markers.

mercurial/discovery.py

@@ -1,372 +1,374 b''
 # discovery.py - protocol changeset discovery functions
 #
 # Copyright 2010 Matt Mackall <[e-mail]>
 #
 # 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, short
 from i18n import _
 import util, setdiscovery, treediscovery, phases, obsolete
 
 def findcommonincoming(repo, remote, heads=None, force=False):
     """Return a tuple (common, anyincoming, heads) used to identify the common
     subset of nodes between repo and remote.
 
     "common" is a list of (at least) the heads of the common subset.
     "anyincoming" is testable as a boolean indicating if any nodes are missing
       locally. If remote does not support getbundle, this actually is a list of
       roots of the nodes that would be incoming, to be supplied to
       changegroupsubset. No code except for pull should be relying on this fact
       any longer.
     "heads" is either the supplied heads, or else the remote's heads.
 
     If you pass heads and they are all known locally, the response lists just
     these heads in "common" and in "heads".
 
     Please use findcommonoutgoing to compute the set of outgoing nodes to give
     extensions a good hook into outgoing.
     """
 
     if not remote.capable('getbundle'):
         return treediscovery.findcommonincoming(repo, remote, heads, force)
 
     if heads:
         allknown = True
         nm = repo.changelog.nodemap
         for h in heads:
             if nm.get(h) is None:
                 allknown = False
                 break
         if allknown:
             return (heads, False, heads)
 
     res = setdiscovery.findcommonheads(repo.ui, repo, remote,
                                        abortwhenunrelated=not force)
     common, anyinc, srvheads = res
     return (list(common), anyinc, heads or list(srvheads))
 
 class outgoing(object):
     '''Represents the set of nodes present in a local repo but not in a
     (possibly) remote one.
 
     Members:
 
       missing is a list of all nodes present in local but not in remote.
       common is a list of all nodes shared between the two repos.
       excluded is the list of missing changeset that shouldn't be sent remotely.
       missingheads is the list of heads of missing.
       commonheads is the list of heads of common.
 
     The sets are computed on demand from the heads, unless provided upfront
     by discovery.'''
 
     def __init__(self, revlog, commonheads, missingheads):
         self.commonheads = commonheads
         self.missingheads = missingheads
         self._revlog = revlog
         self._common = None
         self._missing = None
         self.excluded = []
 
     def _computecommonmissing(self):
         sets = self._revlog.findcommonmissing(self.commonheads,
                                               self.missingheads)
         self._common, self._missing = sets
 
     @util.propertycache
     def common(self):
         if self._common is None:
             self._computecommonmissing()
         return self._common
 
     @util.propertycache
     def missing(self):
         if self._missing is None:
             self._computecommonmissing()
         return self._missing
 
 def findcommonoutgoing(repo, other, onlyheads=None, force=False,
                        commoninc=None, portable=False):
     '''Return an outgoing instance to identify the nodes present in repo but
     not in other.
 
     If onlyheads is given, only nodes ancestral to nodes in onlyheads
     (inclusive) are included. If you already know the local repo's heads,
     passing them in onlyheads is faster than letting them be recomputed here.
 
     If commoninc is given, it must be the result of a prior call to
     findcommonincoming(repo, other, force) to avoid recomputing it here.
 
     If portable is given, compute more conservative common and missingheads,
     to make bundles created from the instance more portable.'''
     # declare an empty outgoing object to be filled later
     og = outgoing(repo.changelog, None, None)
 
     # get common set if not provided
     if commoninc is None:
         commoninc = findcommonincoming(repo, other, force=force)
     og.commonheads, _any, _hds = commoninc
 
     # compute outgoing
     mayexclude = (repo._phasecache.phaseroots[phases.secret] or repo.obsstore)
     if not mayexclude:
         og.missingheads = onlyheads or repo.heads()
     elif onlyheads is None:
         # use visible heads as it should be cached
         og.missingheads = visibleheads(repo)
         og.excluded = [ctx.node() for ctx in repo.set('secret() or extinct()')]
     else:
         # compute common, missing and exclude secret stuff
         sets = repo.changelog.findcommonmissing(og.commonheads, onlyheads)
         og._common, allmissing = sets
         og._missing = missing = []
         og.excluded = excluded = []
         for node in allmissing:
             ctx = repo[node]
             if ctx.phase() >= phases.secret or ctx.extinct():
                 excluded.append(node)
             else:
                 missing.append(node)
         if len(missing) == len(allmissing):
             missingheads = onlyheads
         else: # update missing heads
             missingheads = phases.newheads(repo, onlyheads, excluded)
         og.missingheads = missingheads
     if portable:
         # recompute common and missingheads as if -r<rev> had been given for
         # each head of missing, and --base <rev> for each head of the proper
         # ancestors of missing
         og._computecommonmissing()
         cl = repo.changelog
         missingrevs = set(cl.rev(n) for n in og._missing)
         og._common = set(cl.ancestors(missingrevs)) - missingrevs
         commonheads = set(og.commonheads)
         og.missingheads = [h for h in og.missingheads if h not in commonheads]
 
     return og
 
 def _headssummary(repo, remote, outgoing):
     """compute a summary of branch and heads status before and after push
 
     return {'branch': ([remoteheads], [newheads], [unsyncedheads])} mapping
 
     - branch: the branch name
     - remoteheads: the list of remote heads known locally
                    None is the branch is new
     - newheads: the new remote heads (known locally) with outgoing pushed
     - unsyncedheads: the list of remote heads unknown locally.
     """
     cl = repo.changelog
     headssum = {}
     # A. Create set of branches involved in the push.
     branches = set(repo[n].branch() for n in outgoing.missing)
     remotemap = remote.branchmap()
     newbranches = branches - set(remotemap)
     branches.difference_update(newbranches)
 
     # A. register remote heads
     remotebranches = set()
     for branch, heads in remote.branchmap().iteritems():
         remotebranches.add(branch)
         known = []
         unsynced = []
         for h in heads:
             if h in cl.nodemap:
                 known.append(h)
             else:
                 unsynced.append(h)
         headssum[branch] = (known, list(known), unsynced)
     # B. add new branch data
     missingctx = list(repo[n] for n in outgoing.missing)
     touchedbranches = set()
     for ctx in missingctx:
         branch = ctx.branch()
         touchedbranches.add(branch)
         if branch not in headssum:
             headssum[branch] = (None, [], [])
 
     # C drop data about untouched branches:
     for branch in remotebranches - touchedbranches:
         del headssum[branch]
 
     # D. Update newmap with outgoing changes.
     # This will possibly add new heads and remove existing ones.
     newmap = dict((branch, heads[1]) for branch, heads in headssum.iteritems()
                   if heads[0] is not None)
     repo._updatebranchcache(newmap, missingctx)
     for branch, newheads in newmap.iteritems():
         headssum[branch][1][:] = newheads
     return headssum
 
 def _oldheadssummary(repo, remoteheads, outgoing, inc=False):
     """Compute branchmapsummary for repo without branchmap support"""
 
     cl = repo.changelog
     # 1-4b. old servers: Check for new topological heads.
     # Construct {old,new}map with branch = None (topological branch).
     # (code based on _updatebranchcache)
     oldheads = set(h for h in remoteheads if h in cl.nodemap)
     # all nodes in outgoing.missing are children of either:
     # - an element of oldheads
     # - another element of outgoing.missing
     # - nullrev
     # This explains why the new head are very simple to compute.
     r = repo.set('heads(%ln + %ln)', oldheads, outgoing.missing)
     newheads = list(c.node() for c in r)
     unsynced = inc and set([None]) or set()
     return {None: (oldheads, newheads, unsynced)}
 
 def checkheads(repo, remote, outgoing, remoteheads, newbranch=False, inc=False):
     """Check that a push won't add any outgoing head
 
     raise Abort error and display ui message as needed.
     """
     # Check for each named branch if we're creating new remote heads.
     # To be a remote head after push, node must be either:
     # - unknown locally
     # - a local outgoing head descended from update
     # - a remote head that's known locally and not
     #   ancestral to an outgoing head
     if remoteheads == [nullid]:
         # remote is empty, nothing to check.
         return
 
     if remote.capable('branchmap'):
         headssum = _headssummary(repo, remote, outgoing)
     else:
         headssum = _oldheadssummary(repo, remoteheads, outgoing, inc)
     newbranches = [branch for branch, heads in headssum.iteritems()
                    if heads[0] is None]
     # 1. Check for new branches on the remote.
     if newbranches and not newbranch:  # new branch requires --new-branch
         branchnames = ', '.join(sorted(newbranches))
         raise util.Abort(_("push creates new remote branches: %s!")
                            % branchnames,
                          hint=_("use 'hg push --new-branch' to create"
                                 " new remote branches"))
 
     # 2 compute newly pushed bookmarks. We
     # we don't warned about bookmarked heads.
     localbookmarks = repo._bookmarks
     remotebookmarks = remote.listkeys('bookmarks')
     bookmarkedheads = set()
     for bm in localbookmarks:
         rnode = remotebookmarks.get(bm)
         if rnode and rnode in repo:
             lctx, rctx = repo[bm], repo[rnode]
             if rctx == lctx.ancestor(rctx):
                 bookmarkedheads.add(lctx.node())
 
     # 3. Check for new heads.
     # If there are more heads after the push than before, a suitable
     # error message, depending on unsynced status, is displayed.
     error = None
     unsynced = False
     allmissing = set(outgoing.missing)
+    allfuturecommon = set(c.node() for c in repo.set('%ld', outgoing.common))
+    allfuturecommon.update(allmissing)
     for branch, heads in headssum.iteritems():
         if heads[0] is None:
             # Maybe we should abort if we push more that one head
             # for new branches ?
             continue
         if heads[2]:
             unsynced = True
         oldhs = set(heads[0])
         candidate_newhs = set(heads[1])
         # add unsynced data
         oldhs.update(heads[2])
         candidate_newhs.update(heads[2])
         dhs = None
         if repo.obsstore:
             # remove future heads which are actually obsolete by another
             # pushed element:
             #
             # XXX There is several case this case does not handle properly
             #
             # (1) if <nh> is public, it won't be affected by obsolete marker
             #     and a new is created
             #
             # (2) if the new heads have ancestors which are not obsolete and
             #     not ancestors of any other heads we will have a new head too.
             #
             # This two case will be easy to handle for know changeset but much
             # more tricky for unsynced changes.
             newhs = set()
             for nh in candidate_newhs:
-                if repo[nh].phase() <= phases.public:
+                if nh in repo and repo[nh].phase() <= phases.public:
                     newhs.add(nh)
                 else:
                     for suc in obsolete.anysuccessors(repo.obsstore, nh):
-                        if suc != nh and suc in allmissing:
+                        if suc != nh and suc in allfuturecommon:
                             break
                     else:
                         newhs.add(nh)
         else:
             newhs = candidate_newhs
         if len(newhs) > len(oldhs):
             # strip updates to existing remote heads from the new heads list
             dhs = list(newhs - bookmarkedheads - oldhs)
         if dhs:
             if error is None:
                 if branch not in ('default', None):
                     error = _("push creates new remote head %s "
                               "on branch '%s'!") % (short(dhs[0]), branch)
                 else:
                     error = _("push creates new remote head %s!"
                               ) % short(dhs[0])
                 if heads[2]: # unsynced
                     hint = _("you should pull and merge or "
                              "use push -f to force")
                 else:
                     hint = _("did you forget to merge? "
                              "use push -f to force")
             if branch is not None:
                 repo.ui.note(_("new remote heads on branch '%s'\n") % branch)
             for h in dhs:
                 repo.ui.note(_("new remote head %s\n") % short(h))
     if error:
         raise util.Abort(error, hint=hint)
 
     # 6. Check for unsynced changes on involved branches.
     if unsynced:
         repo.ui.warn(_("note: unsynced remote changes!\n"))
 
 def visibleheads(repo):
     """return the set of visible head of this repo"""
     # XXX we want a cache on this
     sroots = repo._phasecache.phaseroots[phases.secret]
     if sroots or repo.obsstore:
         # XXX very slow revset. storing heads or secret "boundary"
         # would help.
         revset = repo.set('heads(not (%ln:: + extinct()))', sroots)
 
         vheads = [ctx.node() for ctx in revset]
         if not vheads:
             vheads.append(nullid)
     else:
         vheads = repo.heads()
     return vheads
 
 
 def visiblebranchmap(repo):
     """return a branchmap for the visible set"""
     # XXX Recomputing this data on the fly is very slow.  We should build a
     # XXX cached version while computing the standard branchmap version.
     sroots = repo._phasecache.phaseroots[phases.secret]
     if sroots or repo.obsstore:
         vbranchmap = {}
         for branch, nodes in  repo.branchmap().iteritems():
             # search for secret heads.
             for n in nodes:
                 if repo[n].phase() >= phases.secret:
                     nodes = None
                     break
             # if secret heads were found we must compute them again
             if nodes is None:
                 s = repo.set('heads(branch(%s) - secret() - extinct())',
                              branch)
                 nodes = [c.node() for c in s]
             vbranchmap[branch] = nodes
     else:
         vbranchmap = repo.branchmap()
     return vbranchmap

tests/test-bookmarks-pushpull.t

@@ -1,298 +1,298 b''
   $ "$TESTDIR/hghave" serve || exit 80
 
 initialize
 
   $ hg init a
   $ cd a
   $ echo 'test' > test
   $ hg commit -Am'test'
   adding test
 
 set bookmarks
 
   $ hg bookmark X
   $ hg bookmark Y
   $ hg bookmark Z
 
 import bookmark by name
 
   $ hg init ../b
   $ cd ../b
   $ hg book Y
   $ hg book
    * Y                         -1:000000000000
   $ hg pull ../a
   pulling from ../a
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   updating bookmark Y
   adding remote bookmark X
   adding remote bookmark Z
   (run 'hg update' to get a working copy)
   $ hg bookmarks
      X                         0:4e3505fd9583
      Y                         0:4e3505fd9583
      Z                         0:4e3505fd9583
   $ hg debugpushkey ../a namespaces
   bookmarks	
   phases	
   namespaces	
   $ hg debugpushkey ../a bookmarks
   Y	4e3505fd95835d721066b76e75dbb8cc554d7f77
   X	4e3505fd95835d721066b76e75dbb8cc554d7f77
   Z	4e3505fd95835d721066b76e75dbb8cc554d7f77
   $ hg pull -B X ../a
   pulling from ../a
   no changes found
   importing bookmark X
   $ hg bookmark
      X                         0:4e3505fd9583
      Y                         0:4e3505fd9583
      Z                         0:4e3505fd9583
 
 export bookmark by name
 
   $ hg bookmark W
   $ hg bookmark foo
   $ hg bookmark foobar
   $ hg push -B W ../a
   pushing to ../a
   searching for changes
   no changes found
   exporting bookmark W
   [1]
   $ hg -R ../a bookmarks
      W                         -1:000000000000
      X                         0:4e3505fd9583
      Y                         0:4e3505fd9583
    * Z                         0:4e3505fd9583
 
 delete a remote bookmark
 
   $ hg book -d W
   $ hg push -B W ../a
   pushing to ../a
   searching for changes
   no changes found
   deleting remote bookmark W
   [1]
 
 push/pull name that doesn't exist
 
   $ hg push -B badname ../a
   pushing to ../a
   searching for changes
   no changes found
   bookmark badname does not exist on the local or remote repository!
   [2]
   $ hg pull -B anotherbadname ../a
   pulling from ../a
   abort: remote bookmark anotherbadname not found!
   [255]
 
 divergent bookmarks
 
   $ cd ../a
   $ echo c1 > f1
   $ hg ci -Am1
   adding f1
   $ hg book -f X
   $ hg book
    * X                         1:0d2164f0ce0d
      Y                         0:4e3505fd9583
      Z                         1:0d2164f0ce0d
 
   $ cd ../b
   $ hg up
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   updating bookmark foobar
   $ echo c2 > f2
   $ hg ci -Am2
   adding f2
   $ hg book -f X
   $ hg book
    * X                         1:9b140be10808
      Y                         0:4e3505fd9583
      Z                         0:4e3505fd9583
      foo                       -1:000000000000
      foobar                    1:9b140be10808
 
   $ hg pull --config paths.foo=../a foo
   pulling from $TESTTMP/a (glob)
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   divergent bookmark X stored as X@foo
   updating bookmark Z
   (run 'hg heads' to see heads, 'hg merge' to merge)
   $ hg book
    * X                         1:9b140be10808
      X@foo                     2:0d2164f0ce0d
      Y                         0:4e3505fd9583
      Z                         2:0d2164f0ce0d
      foo                       -1:000000000000
      foobar                    1:9b140be10808
   $ hg push -f ../a
   pushing to ../a
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   $ hg -R ../a book
    * X                         1:0d2164f0ce0d
      Y                         0:4e3505fd9583
      Z                         1:0d2164f0ce0d
 
 update a remote bookmark from a non-head to a head
 
   $ hg up -q Y
   $ echo c3 > f2
   $ hg ci -Am3
   adding f2
   created new head
   $ hg push ../a
   pushing to ../a
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   updating bookmark Y
   $ hg -R ../a book
    * X                         1:0d2164f0ce0d
      Y                         3:f6fc62dde3c0
      Z                         1:0d2164f0ce0d
 
 diverging a remote bookmark fails
 
   $ hg up -q 4e3505fd9583
   $ echo c4 > f2
   $ hg ci -Am4
   adding f2
   created new head
   $ hg book -f Y
 
   $ cat <<EOF > ../a/.hg/hgrc
   > [web]
   > push_ssl = false
   > allow_push = *
   > EOF
 
   $ hg -R ../a serve -p $HGPORT2 -d --pid-file=../hg2.pid
   $ cat ../hg2.pid >> $DAEMON_PIDS
 
   $ hg push http://localhost:$HGPORT2/
   pushing to http://localhost:$HGPORT2/
   searching for changes
   abort: push creates new remote head 4efff6d98829!
   (did you forget to merge? use push -f to force)
   [255]
   $ hg -R ../a book
    * X                         1:0d2164f0ce0d
      Y                         3:f6fc62dde3c0
      Z                         1:0d2164f0ce0d
 
 hgweb
 
   $ cat <<EOF > .hg/hgrc
   > [web]
   > push_ssl = false
   > allow_push = *
   > EOF
 
   $ hg serve -p $HGPORT -d --pid-file=../hg.pid -E errors.log
   $ cat ../hg.pid >> $DAEMON_PIDS
   $ cd ../a
 
   $ hg debugpushkey http://localhost:$HGPORT/ namespaces
   bookmarks	
   phases	
   namespaces	
   $ hg debugpushkey http://localhost:$HGPORT/ bookmarks
   Y	4efff6d98829d9c824c621afd6e3f01865f5439f
   foobar	9b140be1080824d768c5a4691a564088eede71f9
   Z	0d2164f0ce0d8f1d6f94351eba04b794909be66c
   foo	0000000000000000000000000000000000000000
   X	9b140be1080824d768c5a4691a564088eede71f9
   $ hg out -B http://localhost:$HGPORT/
   comparing with http://localhost:$HGPORT/
   searching for changed bookmarks
   no changed bookmarks found
   [1]
   $ hg push -B Z http://localhost:$HGPORT/
   pushing to http://localhost:$HGPORT/
   searching for changes
   no changes found
   exporting bookmark Z
   [1]
   $ hg book -d Z
   $ hg in -B http://localhost:$HGPORT/
   comparing with http://localhost:$HGPORT/
   searching for changed bookmarks
      Z                         0d2164f0ce0d
      foo                       000000000000
      foobar                    9b140be10808
   $ hg pull -B Z http://localhost:$HGPORT/
   pulling from http://localhost:$HGPORT/
   no changes found
   adding remote bookmark foobar
   adding remote bookmark Z
   adding remote bookmark foo
   divergent bookmark X stored as X@1
   importing bookmark Z
   $ hg clone http://localhost:$HGPORT/ cloned-bookmarks
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 5 changesets with 5 changes to 3 files (+3 heads)
   updating to branch default
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg -R cloned-bookmarks bookmarks
      X                         1:9b140be10808
      Y                         4:4efff6d98829
      Z                         2:0d2164f0ce0d
      foo                       -1:000000000000
      foobar                    1:9b140be10808
 
   $ cd ..
 
 Pushing a bookmark should only push the changes required by that
 bookmark, not all outgoing changes:
   $ hg clone http://localhost:$HGPORT/ addmarks
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 5 changesets with 5 changes to 3 files (+3 heads)
   updating to branch default
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd addmarks
   $ echo foo > foo
   $ hg add foo
   $ hg commit -m 'add foo'
   $ echo bar > bar
   $ hg add bar
   $ hg commit -m 'add bar'
   $ hg co "tip^"
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ hg book add-foo
   $ hg book -r tip add-bar
 Note: this push *must* push only a single changeset, as that's the point
 of this test.
-  $ hg push -B add-foo
+  $ hg push -B add-foo --traceback
   pushing to http://localhost:$HGPORT/
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: added 1 changesets with 1 changes to 1 files
   exporting bookmark add-foo
 
   $ cd ..

tests/test-obsolete-checkheads.t

@@ -1,161 +1,273 b''
 Check that obsolete properly strip heads
   $ cat > obs.py << EOF
   > import mercurial.obsolete
   > mercurial.obsolete._enabled = True
   > EOF
   $ cat >> $HGRCPATH << EOF
   > [phases]
   > # public changeset are not obsolete
   > publish=false
   > [ui]
   > logtemplate='{node|short} ({phase}) {desc|firstline}\n'
   > [extensions]
   > graphlog=
   > EOF
   $ echo "obs=${TESTTMP}/obs.py" >> $HGRCPATH
   $ mkcommit() {
   >    echo "$1" > "$1"
   >    hg add "$1"
   >    hg ci -m "add $1"
   > }
   $ getid() {
   >    hg id --debug -ir "desc('$1')"
   > }
 
 
   $ hg init remote
   $ cd remote
   $ mkcommit base
   $ hg phase --public .
   $ cd ..
   $ cp -r remote base
   $ hg clone remote local
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd local
 
 New head replaces old head
 ==========================
 
 setup
 
   $ mkcommit old
   $ hg push
   pushing to $TESTTMP/remote
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   $ hg up -q '.^'
   $ mkcommit new
   created new head
   $ hg debugobsolete `getid old` `getid new`
   $ hg glog --hidden
   @  71e3228bffe1 (draft) add new
   |
   | x  c70b08862e08 (draft) add old
   |/
   o  b4952fcf48cf (public) add base
   
   $ cp -r ../remote ../backup1
 
 old exists remotely as draft. It is obsoleted by new that we now push.
 Push should not warn about creating new head
 
   $ hg push
   pushing to $TESTTMP/remote
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
 
 old head is now public (public local version)
 =============================================
 
 setup
 
   $ rm -fr ../remote
   $ cp -r ../backup1 ../remote
   $ hg -R ../remote phase --public c70b08862e08
   $ hg pull -v
   pulling from $TESTTMP/remote
   searching for changes
   no changes found
   $ hg glog --hidden
   @  71e3228bffe1 (draft) add new
   |
   | o  c70b08862e08 (public) add old
   |/
   o  b4952fcf48cf (public) add base
   
 
 Abort: old will still be an head because it's public.
 
   $ hg push
   pushing to $TESTTMP/remote
   searching for changes
   abort: push creates new remote head 71e3228bffe1!
   (did you forget to merge? use push -f to force)
   [255]
 
 old head is now public (public remote version)
 ==============================================
 
 TODO: Not implemented yet.
 
 # setup
 #
 #   $ rm -fr ../remote
 #   $ cp -r ../backup1 ../remote
 #   $ hg -R ../remote phase --public c70b08862e08
 #   $ hg phase --draft --force c70b08862e08
 #   $ hg glog --hidden
 #   @  71e3228bffe1 (draft) add new
 #   |
 #   | x  c70b08862e08 (draft) add old
 #   |/
 #   o  b4952fcf48cf (public) add base
 #
 #
 #
 # Abort: old will still be an head because it's public.
 #
 #   $ hg push
 #   pushing to $TESTTMP/remote
 #   searching for changes
 #   abort: push creates new remote head 71e3228bffe1!
 #   (did you forget to merge? use push -f to force)
 #   [255]
 
 old head is obsolete but replacement is not pushed
 ==================================================
 
 setup
 
   $ rm -fr ../remote
   $ cp -r ../backup1 ../remote
   $ hg phase --draft --force '(0::) - 0'
   $ hg up -q '.^'
   $ mkcommit other
   created new head
   $ hg glog --hidden
   @  d7d41ccbd4de (draft) add other
   |
   | o  71e3228bffe1 (draft) add new
   |/
   | x  c70b08862e08 (draft) add old
   |/
   o  b4952fcf48cf (public) add base
   
 
 old exists remotely as draft. It is obsoleted by new but we don't push new.
 Push should abort on new head
 
   $ hg push -r 'desc("other")'
   pushing to $TESTTMP/remote
   searching for changes
   abort: push creates new remote head d7d41ccbd4de!
   (did you forget to merge? use push -f to force)
   [255]
+
+
+
+Both precursors and successors are already know remotely. Descendant adds heads
+===============================================================================
+
+setup. (The obsolete marker is known locally only
+
+  $ cd ..
+  $ rm -rf local
+  $ hg clone remote local
+  updating to branch default
+  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ cd local
+  $ mkcommit old
+  old already tracked!
+  nothing changed
+  [1]
+  $ hg up -q '.^'
+  $ mkcommit new
+  created new head
+  $ hg push -f
+  pushing to $TESTTMP/remote
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files (+1 heads)
+  $ mkcommit desc1
+  $ hg up -q '.^'
+  $ mkcommit desc2
+  created new head
+  $ hg debugobsolete `getid old` `getid new`
+  $ hg glog --hidden
+  @  5fe37041cc2b (draft) add desc2
+  |
+  | o  a3ef1d111c5f (draft) add desc1
+  |/
+  o  71e3228bffe1 (draft) add new
+  |
+  | x  c70b08862e08 (draft) add old
+  |/
+  o  b4952fcf48cf (public) add base
+  
+  $ hg glog --hidden -R ../remote
+  o  71e3228bffe1 (draft) add new
+  |
+  | o  c70b08862e08 (draft) add old
+  |/
+  @  b4952fcf48cf (public) add base
+  
+  $ cp -r ../remote ../backup2
+
+Push should not warn about adding new heads. We create one, but we'll delete
+one anyway.
+
+  $ hg push
+  pushing to $TESTTMP/remote
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 2 changesets with 2 changes to 2 files (+1 heads)
+
+
+Remote head is unknown but obsoleted by a local changeset
+=========================================================
+
+setup
+
+  $ rm -fr ../remote
+  $ cp -r ../backup1 ../remote
+  $ cd ..
+  $ rm -rf local
+  $ hg clone remote local -r 0
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  updating to branch default
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ cd local
+  $ mkcommit new
+  $ hg -R ../remote id --debug -r tip
+  c70b08862e0838ea6d7c59c85da2f1ed6c8d67da tip
+  $ hg  id --debug -r tip
+  71e3228bffe1886550777233d6c97bb5a6b2a650 tip
+  $ hg debugobsolete c70b08862e0838ea6d7c59c85da2f1ed6c8d67da 71e3228bffe1886550777233d6c97bb5a6b2a650
+  $ hg glog --hidden
+  @  71e3228bffe1 (draft) add new
+  |
+  o  b4952fcf48cf (public) add base
+  
+  $ hg glog --hidden -R ../remote
+  o  c70b08862e08 (draft) add old
+  |
+  @  b4952fcf48cf (public) add base
+  
+
+Push should not complain about new heads.
+
+It should not complain about "unsynced remote changes!" either but that's not
+handled yet.
+
+  $ hg push --traceback
+  pushing to $TESTTMP/remote
+  searching for changes
+  note: unsynced remote changes!
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files (+1 heads)