mercurial/discovery.py
author Pierre-Yves David <pierre-yves.david@logilab.fr>
Tue, 24 Apr 2012 16:32:44 +0200
branchstable
changeset 16535 39d1f83eb05d
parent 15986 ba959f6e10f8
child 16657 b6081c2c4647
child 16736 025b3b763ba9
permissions -rw-r--r--
branchmap: server should not advertise secret changeset in branchmap (Issue3303) Discovery now use an overlay above branchmap to prune invisible "secret" changeset from branchmap. To minimise impact on the code during the code freeze, this is achieve by recomputing non-secret heads on the fly when any secret changeset exists. This is a computation heavy approach similar to the one used for visible heads. But few sever should contains secret changeset anyway. See comment in code for more robust approach. On local repo the wrapper is applied explicitly while the wire-protocol take care of wrapping branchmap call in a transparent way. This could be unified by the Peter Arrenbrecht and Sune Foldager proposal of a `peer` object. An inappropriate `(+i heads)` may still appear when pushing new changes on a repository with secret changeset. (see Issue3394 for details)
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# discovery.py - protocol changeset discovery functions
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#
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# Copyright 2010 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from node import nullid, short
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from i18n import _
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import util, setdiscovery, treediscovery, phases
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def findcommonincoming(repo, remote, heads=None, force=False):
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    """Return a tuple (common, anyincoming, heads) used to identify the common
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    subset of nodes between repo and remote.
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    "common" is a list of (at least) the heads of the common subset.
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    "anyincoming" is testable as a boolean indicating if any nodes are missing
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      locally. If remote does not support getbundle, this actually is a list of
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      roots of the nodes that would be incoming, to be supplied to
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      changegroupsubset. No code except for pull should be relying on this fact
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      any longer.
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    "heads" is either the supplied heads, or else the remote's heads.
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    If you pass heads and they are all known locally, the reponse lists justs
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    these heads in "common" and in "heads".
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    Please use findcommonoutgoing to compute the set of outgoing nodes to give
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    extensions a good hook into outgoing.
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    """
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    if not remote.capable('getbundle'):
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        return treediscovery.findcommonincoming(repo, remote, heads, force)
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    if heads:
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        allknown = True
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        nm = repo.changelog.nodemap
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        for h in heads:
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            if nm.get(h) is None:
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                allknown = False
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                break
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        if allknown:
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            return (heads, False, heads)
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    res = setdiscovery.findcommonheads(repo.ui, repo, remote,
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                                       abortwhenunrelated=not force)
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    common, anyinc, srvheads = res
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    return (list(common), anyinc, heads or list(srvheads))
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class outgoing(object):
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    '''Represents the set of nodes present in a local repo but not in a
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    (possibly) remote one.
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    Members:
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      missing is a list of all nodes present in local but not in remote.
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      common is a list of all nodes shared between the two repos.
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      excluded is the list of missing changeset that shouldn't be sent remotely.
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      missingheads is the list of heads of missing.
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      commonheads is the list of heads of common.
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    The sets are computed on demand from the heads, unless provided upfront
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    by discovery.'''
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    def __init__(self, revlog, commonheads, missingheads):
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        self.commonheads = commonheads
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        self.missingheads = missingheads
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        self._revlog = revlog
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        self._common = None
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        self._missing = None
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        self.excluded = []
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    def _computecommonmissing(self):
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        sets = self._revlog.findcommonmissing(self.commonheads,
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                                              self.missingheads)
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        self._common, self._missing = sets
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    @util.propertycache
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    def common(self):
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        if self._common is None:
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            self._computecommonmissing()
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        return self._common
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    @util.propertycache
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    def missing(self):
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        if self._missing is None:
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            self._computecommonmissing()
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        return self._missing
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def findcommonoutgoing(repo, other, onlyheads=None, force=False, commoninc=None):
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    '''Return an outgoing instance to identify the nodes present in repo but
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    not in other.
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    If onlyheads is given, only nodes ancestral to nodes in onlyheads (inclusive)
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    are included. If you already know the local repo's heads, passing them in
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    onlyheads is faster than letting them be recomputed here.
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    If commoninc is given, it must the the result of a prior call to
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    findcommonincoming(repo, other, force) to avoid recomputing it here.'''
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    # declare an empty outgoing object to be filled later
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    og = outgoing(repo.changelog, None, None)
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    # get common set if not provided
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    if commoninc is None:
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        commoninc = findcommonincoming(repo, other, force=force)
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    og.commonheads, _any, _hds = commoninc
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    # compute outgoing
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    if not repo._phaseroots[phases.secret]:
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        og.missingheads = onlyheads or repo.heads()
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    elif onlyheads is None:
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        # use visible heads as it should be cached
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        og.missingheads = phases.visibleheads(repo)
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        og.excluded = [ctx.node() for ctx in repo.set('secret()')]
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    else:
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        # compute common, missing and exclude secret stuff
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        sets = repo.changelog.findcommonmissing(og.commonheads, onlyheads)
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        og._common, allmissing = sets
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        og._missing = missing = []
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        og.excluded = excluded = []
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        for node in allmissing:
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            if repo[node].phase() >= phases.secret:
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                excluded.append(node)
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            else:
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                missing.append(node)
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        if excluded:
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            # update missing heads
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            missingheads = phases.newheads(repo, onlyheads, excluded)
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        else:
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            missingheads = onlyheads
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        og.missingheads = missingheads
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    return og
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def checkheads(repo, remote, outgoing, remoteheads, newbranch=False, inc=False):
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    """Check that a push won't add any outgoing head
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    raise Abort error and display ui message as needed.
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    """
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    if remoteheads == [nullid]:
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        # remote is empty, nothing to check.
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        return
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    cl = repo.changelog
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    if remote.capable('branchmap'):
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        # Check for each named branch if we're creating new remote heads.
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        # To be a remote head after push, node must be either:
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        # - unknown locally
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        # - a local outgoing head descended from update
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        # - a remote head that's known locally and not
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        #   ancestral to an outgoing head
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        # 1. Create set of branches involved in the push.
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        branches = set(repo[n].branch() for n in outgoing.missing)
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   154
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        # 2. Check for new branches on the remote.
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        if remote.local():
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            remotemap = phases.visiblebranchmap(remote)
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        else:
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            remotemap = remote.branchmap()
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        newbranches = branches - set(remotemap)
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        if newbranches and not newbranch: # new branch requires --new-branch
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            branchnames = ', '.join(sorted(newbranches))
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            raise util.Abort(_("push creates new remote branches: %s!")
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                               % branchnames,
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                             hint=_("use 'hg push --new-branch' to create"
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                                    " new remote branches"))
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        branches.difference_update(newbranches)
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        # 3. Construct the initial oldmap and newmap dicts.
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        # They contain information about the remote heads before and
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        # after the push, respectively.
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        # Heads not found locally are not included in either dict,
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        # since they won't be affected by the push.
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        # unsynced contains all branches with incoming changesets.
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        oldmap = {}
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        newmap = {}
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        unsynced = set()
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        for branch in branches:
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            remotebrheads = remotemap[branch]
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            prunedbrheads = [h for h in remotebrheads if h in cl.nodemap]
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            oldmap[branch] = prunedbrheads
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            newmap[branch] = list(prunedbrheads)
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            if len(remotebrheads) > len(prunedbrheads):
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                unsynced.add(branch)
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        # 4. Update newmap with outgoing changes.
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        # This will possibly add new heads and remove existing ones.
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        ctxgen = (repo[n] for n in outgoing.missing)
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        repo._updatebranchcache(newmap, ctxgen)
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    else:
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        # 1-4b. old servers: Check for new topological heads.
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        # Construct {old,new}map with branch = None (topological branch).
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        # (code based on _updatebranchcache)
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        oldheads = set(h for h in remoteheads if h in cl.nodemap)
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        newheads = oldheads.union(outgoing.missing)
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        if len(newheads) > 1:
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            for latest in reversed(outgoing.missing):
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                if latest not in newheads:
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                    continue
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                minhrev = min(cl.rev(h) for h in newheads)
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                reachable = cl.reachable(latest, cl.node(minhrev))
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                reachable.remove(latest)
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                newheads.difference_update(reachable)
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        branches = set([None])
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        newmap = {None: newheads}
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        oldmap = {None: oldheads}
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        unsynced = inc and branches or set()
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    # 5. Check for new heads.
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    # If there are more heads after the push than before, a suitable
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    # error message, depending on unsynced status, is displayed.
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    error = None
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    for branch in branches:
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        newhs = set(newmap[branch])
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        oldhs = set(oldmap[branch])
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        if len(newhs) > len(oldhs):
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            dhs = list(newhs - oldhs)
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            if error is None:
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                if branch not in ('default', None):
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                    error = _("push creates new remote head %s "
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                              "on branch '%s'!") % (short(dhs[0]), branch)
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                else:
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                    error = _("push creates new remote head %s!"
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                              ) % short(dhs[0])
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                if branch in unsynced:
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                    hint = _("you should pull and merge or "
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                             "use push -f to force")
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                else:
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                    hint = _("did you forget to merge? "
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                             "use push -f to force")
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            if branch is not None:
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                repo.ui.note(_("new remote heads on branch '%s'\n") % branch)
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            for h in dhs:
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                repo.ui.note(_("new remote head %s\n") % short(h))
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    if error:
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        raise util.Abort(error, hint=hint)
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15932
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    # 6. Check for unsynced changes on involved branches.
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    if unsynced:
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        repo.ui.warn(_("note: unsynced remote changes!\n"))