bundle2: only use callable return as reply handler

When a bundle2 parts generator returns a non callable value, it should not be
used as a reply handler. The changegroup part generator is already having this
case of behavior when there is no changegroup to push. This changeset prevent a
crash for user of the experimentable bundle2 feature.

mercurial/exchange.py

@@ -1,811 +1,812
 # exchange.py - utility to exchange data between repos.
 #
 # Copyright 2005-2007 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 i18n import _
 from node import hex, nullid
 import errno, urllib
 import util, scmutil, changegroup, base85, error
 import discovery, phases, obsolete, bookmarks, bundle2, pushkey
 
 def readbundle(ui, fh, fname, vfs=None):
     header = changegroup.readexactly(fh, 4)
 
     alg = None
     if not fname:
         fname = "stream"
         if not header.startswith('HG') and header.startswith('\0'):
             fh = changegroup.headerlessfixup(fh, header)
             header = "HG10"
             alg = 'UN'
     elif vfs:
         fname = vfs.join(fname)
 
     magic, version = header[0:2], header[2:4]
 
     if magic != 'HG':
         raise util.Abort(_('%s: not a Mercurial bundle') % fname)
     if version == '10':
         if alg is None:
             alg = changegroup.readexactly(fh, 2)
         return changegroup.unbundle10(fh, alg)
     elif version == '2X':
         return bundle2.unbundle20(ui, fh, header=magic + version)
     else:
         raise util.Abort(_('%s: unknown bundle version %s') % (fname, version))
 
 
 class pushoperation(object):
     """A object that represent a single push operation
 
     It purpose is to carry push related state and very common operation.
 
     A new should be created at the beginning of each push and discarded
     afterward.
     """
 
     def __init__(self, repo, remote, force=False, revs=None, newbranch=False):
         # repo we push from
         self.repo = repo
         self.ui = repo.ui
         # repo we push to
         self.remote = remote
         # force option provided
         self.force = force
         # revs to be pushed (None is "all")
         self.revs = revs
         # allow push of new branch
         self.newbranch = newbranch
         # did a local lock get acquired?
         self.locallocked = None
         # step already performed
         # (used to check what steps have been already performed through bundle2)
         self.stepsdone = set()
         # Integer version of the push result
         # - None means nothing to push
         # - 0 means HTTP error
         # - 1 means we pushed and remote head count is unchanged *or*
         #   we have outgoing changesets but refused to push
         # - other values as described by addchangegroup()
         self.ret = None
         # discover.outgoing object (contains common and outgoing data)
         self.outgoing = None
         # all remote heads before the push
         self.remoteheads = None
         # testable as a boolean indicating if any nodes are missing locally.
         self.incoming = None
         # set of all heads common after changeset bundle push
         self.commonheads = None
 
 def push(repo, remote, force=False, revs=None, newbranch=False):
     '''Push outgoing changesets (limited by revs) from a local
     repository to remote. Return an integer:
       - None means nothing to push
       - 0 means HTTP error
       - 1 means we pushed and remote head count is unchanged *or*
         we have outgoing changesets but refused to push
       - other values as described by addchangegroup()
     '''
     pushop = pushoperation(repo, remote, force, revs, newbranch)
     if pushop.remote.local():
         missing = (set(pushop.repo.requirements)
                    - pushop.remote.local().supported)
         if missing:
             msg = _("required features are not"
                     " supported in the destination:"
                     " %s") % (', '.join(sorted(missing)))
             raise util.Abort(msg)
 
     # there are two ways to push to remote repo:
     #
     # addchangegroup assumes local user can lock remote
     # repo (local filesystem, old ssh servers).
     #
     # unbundle assumes local user cannot lock remote repo (new ssh
     # servers, http servers).
 
     if not pushop.remote.canpush():
         raise util.Abort(_("destination does not support push"))
     # get local lock as we might write phase data
     locallock = None
     try:
         locallock = pushop.repo.lock()
         pushop.locallocked = True
     except IOError, err:
         pushop.locallocked = False
         if err.errno != errno.EACCES:
             raise
         # source repo cannot be locked.
         # We do not abort the push, but just disable the local phase
         # synchronisation.
         msg = 'cannot lock source repository: %s\n' % err
         pushop.ui.debug(msg)
     try:
         pushop.repo.checkpush(pushop)
         lock = None
         unbundle = pushop.remote.capable('unbundle')
         if not unbundle:
             lock = pushop.remote.lock()
         try:
             _pushdiscovery(pushop)
             if (pushop.repo.ui.configbool('experimental', 'bundle2-exp',
                                           False)
                 and pushop.remote.capable('bundle2-exp')):
                 _pushbundle2(pushop)
             _pushchangeset(pushop)
             _pushcomputecommonheads(pushop)
             _pushsyncphase(pushop)
             _pushobsolete(pushop)
         finally:
             if lock is not None:
                 lock.release()
     finally:
         if locallock is not None:
             locallock.release()
 
     _pushbookmark(pushop)
     return pushop.ret
 
 def _pushdiscovery(pushop):
     # discovery
     unfi = pushop.repo.unfiltered()
     fci = discovery.findcommonincoming
     commoninc = fci(unfi, pushop.remote, force=pushop.force)
     common, inc, remoteheads = commoninc
     fco = discovery.findcommonoutgoing
     outgoing = fco(unfi, pushop.remote, onlyheads=pushop.revs,
                    commoninc=commoninc, force=pushop.force)
     pushop.outgoing = outgoing
     pushop.remoteheads = remoteheads
     pushop.incoming = inc
 
 def _pushcheckoutgoing(pushop):
     outgoing = pushop.outgoing
     unfi = pushop.repo.unfiltered()
     if not outgoing.missing:
         # nothing to push
         scmutil.nochangesfound(unfi.ui, unfi, outgoing.excluded)
         return False
     # something to push
     if not pushop.force:
         # if repo.obsstore == False --> no obsolete
         # then, save the iteration
         if unfi.obsstore:
             # this message are here for 80 char limit reason
             mso = _("push includes obsolete changeset: %s!")
             mst = "push includes %s changeset: %s!"
             # plain versions for i18n tool to detect them
             _("push includes unstable changeset: %s!")
             _("push includes bumped changeset: %s!")
             _("push includes divergent changeset: %s!")
             # If we are to push if there is at least one
             # obsolete or unstable changeset in missing, at
             # least one of the missinghead will be obsolete or
             # unstable. So checking heads only is ok
             for node in outgoing.missingheads:
                 ctx = unfi[node]
                 if ctx.obsolete():
                     raise util.Abort(mso % ctx)
                 elif ctx.troubled():
                     raise util.Abort(_(mst)
                                      % (ctx.troubles()[0],
                                         ctx))
         newbm = pushop.ui.configlist('bookmarks', 'pushing')
         discovery.checkheads(unfi, pushop.remote, outgoing,
                              pushop.remoteheads,
                              pushop.newbranch,
                              bool(pushop.incoming),
                              newbm)
     return True
 
 def _pushb2ctx(pushop, bundler):
     """handle changegroup push through bundle2
 
     addchangegroup result is stored in the ``pushop.ret`` attribute.
     """
     if 'changesets' in pushop.stepsdone:
         return
     pushop.stepsdone.add('changesets')
     # Send known heads to the server for race detection.
     pushop.stepsdone.add('changesets')
     if not _pushcheckoutgoing(pushop):
         return
     pushop.repo.prepushoutgoinghooks(pushop.repo,
                                      pushop.remote,
                                      pushop.outgoing)
     if not pushop.force:
         bundler.newpart('B2X:CHECK:HEADS', data=iter(pushop.remoteheads))
     cg = changegroup.getlocalbundle(pushop.repo, 'push', pushop.outgoing)
     cgpart = bundler.newpart('B2X:CHANGEGROUP', data=cg.getchunks())
     def handlereply(op):
         """extract addchangroup returns from server reply"""
         cgreplies = op.records.getreplies(cgpart.id)
         assert len(cgreplies['changegroup']) == 1
         pushop.ret = cgreplies['changegroup'][0]['return']
     return handlereply
 
 # list of function that may decide to add parts to an outgoing bundle2
 bundle2partsgenerators = [_pushb2ctx]
 
 def _pushbundle2(pushop):
     """push data to the remote using bundle2
 
     The only currently supported type of data is changegroup but this will
     evolve in the future."""
     bundler = bundle2.bundle20(pushop.ui, bundle2.bundle2caps(pushop.remote))
     # create reply capability
     capsblob = bundle2.encodecaps(pushop.repo.bundle2caps)
     bundler.newpart('b2x:replycaps', data=capsblob)
     replyhandlers = []
     for partgen in bundle2partsgenerators:
         ret = partgen(pushop, bundler)
+        if callable(ret):
         replyhandlers.append(ret)
     # do not push if nothing to push
     if bundler.nbparts <= 1:
         return
     stream = util.chunkbuffer(bundler.getchunks())
     try:
         reply = pushop.remote.unbundle(stream, ['force'], 'push')
     except error.BundleValueError, exc:
         raise util.Abort('missing support for %s' % exc)
     try:
         op = bundle2.processbundle(pushop.repo, reply)
     except error.BundleValueError, exc:
         raise util.Abort('missing support for %s' % exc)
     for rephand in replyhandlers:
         rephand(op)
 
 def _pushchangeset(pushop):
     """Make the actual push of changeset bundle to remote repo"""
     if 'changesets' in pushop.stepsdone:
         return
     pushop.stepsdone.add('changesets')
     if not _pushcheckoutgoing(pushop):
         return
     pushop.repo.prepushoutgoinghooks(pushop.repo,
                                      pushop.remote,
                                      pushop.outgoing)
     outgoing = pushop.outgoing
     unbundle = pushop.remote.capable('unbundle')
     # TODO: get bundlecaps from remote
     bundlecaps = None
     # create a changegroup from local
     if pushop.revs is None and not (outgoing.excluded
                             or pushop.repo.changelog.filteredrevs):
         # push everything,
         # use the fast path, no race possible on push
         bundler = changegroup.bundle10(pushop.repo, bundlecaps)
         cg = changegroup.getsubset(pushop.repo,
                                    outgoing,
                                    bundler,
                                    'push',
                                    fastpath=True)
     else:
         cg = changegroup.getlocalbundle(pushop.repo, 'push', outgoing,
                                         bundlecaps)
 
     # apply changegroup to remote
     if unbundle:
         # local repo finds heads on server, finds out what
         # revs it must push. once revs transferred, if server
         # finds it has different heads (someone else won
         # commit/push race), server aborts.
         if pushop.force:
             remoteheads = ['force']
         else:
             remoteheads = pushop.remoteheads
         # ssh: return remote's addchangegroup()
         # http: return remote's addchangegroup() or 0 for error
         pushop.ret = pushop.remote.unbundle(cg, remoteheads,
                                             pushop.repo.url())
     else:
         # we return an integer indicating remote head count
         # change
         pushop.ret = pushop.remote.addchangegroup(cg, 'push', pushop.repo.url())
 
 def _pushcomputecommonheads(pushop):
     unfi = pushop.repo.unfiltered()
     if pushop.ret:
         # push succeed, synchronize target of the push
         cheads = pushop.outgoing.missingheads
     elif pushop.revs is None:
         # All out push fails. synchronize all common
         cheads = pushop.outgoing.commonheads
     else:
         # I want cheads = heads(::missingheads and ::commonheads)
         # (missingheads is revs with secret changeset filtered out)
         #
         # This can be expressed as:
         #     cheads = ( (missingheads and ::commonheads)
         #              + (commonheads and ::missingheads))"
         #              )
         #
         # while trying to push we already computed the following:
         #     common = (::commonheads)
         #     missing = ((commonheads::missingheads) - commonheads)
         #
         # We can pick:
         # * missingheads part of common (::commonheads)
         common = set(pushop.outgoing.common)
         nm = pushop.repo.changelog.nodemap
         cheads = [node for node in pushop.revs if nm[node] in common]
         # and
         # * commonheads parents on missing
         revset = unfi.set('%ln and parents(roots(%ln))',
                          pushop.outgoing.commonheads,
                          pushop.outgoing.missing)
         cheads.extend(c.node() for c in revset)
     pushop.commonheads = cheads
 
 def _pushsyncphase(pushop):
     """synchronise phase information locally and remotely"""
     unfi = pushop.repo.unfiltered()
     cheads = pushop.commonheads
     # even when we don't push, exchanging phase data is useful
     remotephases = pushop.remote.listkeys('phases')
     if (pushop.ui.configbool('ui', '_usedassubrepo', False)
         and remotephases    # server supports phases
         and pushop.ret is None # nothing was pushed
         and remotephases.get('publishing', False)):
         # When:
         # - this is a subrepo push
         # - and remote support phase
         # - and no changeset was pushed
         # - and remote is publishing
         # We may be in issue 3871 case!
         # We drop the possible phase synchronisation done by
         # courtesy to publish changesets possibly locally draft
         # on the remote.
         remotephases = {'publishing': 'True'}
     if not remotephases: # old server or public only reply from non-publishing
         _localphasemove(pushop, cheads)
         # don't push any phase data as there is nothing to push
     else:
         ana = phases.analyzeremotephases(pushop.repo, cheads,
                                          remotephases)
         pheads, droots = ana
         ### Apply remote phase on local
         if remotephases.get('publishing', False):
             _localphasemove(pushop, cheads)
         else: # publish = False
             _localphasemove(pushop, pheads)
             _localphasemove(pushop, cheads, phases.draft)
         ### Apply local phase on remote
 
         # Get the list of all revs draft on remote by public here.
         # XXX Beware that revset break if droots is not strictly
         # XXX root we may want to ensure it is but it is costly
         outdated = unfi.set('heads((%ln::%ln) and public())',
                             droots, cheads)
 
         b2caps = bundle2.bundle2caps(pushop.remote)
         if 'b2x:pushkey' in b2caps:
             # server supports bundle2, let's do a batched push through it
             #
             # This will eventually be unified with the changesets bundle2 push
             bundler = bundle2.bundle20(pushop.ui, b2caps)
             capsblob = bundle2.encodecaps(pushop.repo.bundle2caps)
             bundler.newpart('b2x:replycaps', data=capsblob)
             part2node = []
             enc = pushkey.encode
             for newremotehead in outdated:
                 part = bundler.newpart('b2x:pushkey')
                 part.addparam('namespace', enc('phases'))
                 part.addparam('key', enc(newremotehead.hex()))
                 part.addparam('old', enc(str(phases.draft)))
                 part.addparam('new', enc(str(phases.public)))
                 part2node.append((part.id, newremotehead))
             stream = util.chunkbuffer(bundler.getchunks())
             try:
                 reply = pushop.remote.unbundle(stream, ['force'], 'push')
                 op = bundle2.processbundle(pushop.repo, reply)
             except error.BundleValueError, exc:
                 raise util.Abort('missing support for %s' % exc)
             for partid, node in part2node:
                 partrep = op.records.getreplies(partid)
                 results = partrep['pushkey']
                 assert len(results) <= 1
                 msg = None
                 if not results:
                     msg = _('server ignored update of %s to public!\n') % node
                 elif not int(results[0]['return']):
                     msg = _('updating %s to public failed!\n') % node
                 if msg is not None:
                     pushop.ui.warn(msg)
 
         else:
             # fallback to independant pushkey command
             for newremotehead in outdated:
                 r = pushop.remote.pushkey('phases',
                                           newremotehead.hex(),
                                           str(phases.draft),
                                           str(phases.public))
                 if not r:
                     pushop.ui.warn(_('updating %s to public failed!\n')
                                    % newremotehead)
 
 def _localphasemove(pushop, nodes, phase=phases.public):
     """move <nodes> to <phase> in the local source repo"""
     if pushop.locallocked:
         phases.advanceboundary(pushop.repo, phase, nodes)
     else:
         # repo is not locked, do not change any phases!
         # Informs the user that phases should have been moved when
         # applicable.
         actualmoves = [n for n in nodes if phase < pushop.repo[n].phase()]
         phasestr = phases.phasenames[phase]
         if actualmoves:
             pushop.ui.status(_('cannot lock source repo, skipping '
                                'local %s phase update\n') % phasestr)
 
 def _pushobsolete(pushop):
     """utility function to push obsolete markers to a remote"""
     pushop.ui.debug('try to push obsolete markers to remote\n')
     repo = pushop.repo
     remote = pushop.remote
     if (obsolete._enabled and repo.obsstore and
         'obsolete' in remote.listkeys('namespaces')):
         rslts = []
         remotedata = repo.listkeys('obsolete')
         for key in sorted(remotedata, reverse=True):
             # reverse sort to ensure we end with dump0
             data = remotedata[key]
             rslts.append(remote.pushkey('obsolete', key, '', data))
         if [r for r in rslts if not r]:
             msg = _('failed to push some obsolete markers!\n')
             repo.ui.warn(msg)
 
 def _pushbookmark(pushop):
     """Update bookmark position on remote"""
     ui = pushop.ui
     repo = pushop.repo.unfiltered()
     remote = pushop.remote
     ui.debug("checking for updated bookmarks\n")
     revnums = map(repo.changelog.rev, pushop.revs or [])
     ancestors = [a for a in repo.changelog.ancestors(revnums, inclusive=True)]
     (addsrc, adddst, advsrc, advdst, diverge, differ, invalid
      ) = bookmarks.compare(repo, repo._bookmarks, remote.listkeys('bookmarks'),
                            srchex=hex)
 
     for b, scid, dcid in advsrc:
         if ancestors and repo[scid].rev() not in ancestors:
             continue
         if remote.pushkey('bookmarks', b, dcid, scid):
             ui.status(_("updating bookmark %s\n") % b)
         else:
             ui.warn(_('updating bookmark %s failed!\n') % b)
 
 class pulloperation(object):
     """A object that represent a single pull operation
 
     It purpose is to carry push related state and very common operation.
 
     A new should be created at the beginning of each pull and discarded
     afterward.
     """
 
     def __init__(self, repo, remote, heads=None, force=False):
         # repo we pull into
         self.repo = repo
         # repo we pull from
         self.remote = remote
         # revision we try to pull (None is "all")
         self.heads = heads
         # do we force pull?
         self.force = force
         # the name the pull transaction
         self._trname = 'pull\n' + util.hidepassword(remote.url())
         # hold the transaction once created
         self._tr = None
         # set of common changeset between local and remote before pull
         self.common = None
         # set of pulled head
         self.rheads = None
         # list of missing changeset to fetch remotely
         self.fetch = None
         # result of changegroup pulling (used as return code by pull)
         self.cgresult = None
         # list of step remaining todo (related to future bundle2 usage)
         self.todosteps = set(['changegroup', 'phases', 'obsmarkers'])
 
     @util.propertycache
     def pulledsubset(self):
         """heads of the set of changeset target by the pull"""
         # compute target subset
         if self.heads is None:
             # We pulled every thing possible
             # sync on everything common
             c = set(self.common)
             ret = list(self.common)
             for n in self.rheads:
                 if n not in c:
                     ret.append(n)
             return ret
         else:
             # We pulled a specific subset
             # sync on this subset
             return self.heads
 
     def gettransaction(self):
         """get appropriate pull transaction, creating it if needed"""
         if self._tr is None:
             self._tr = self.repo.transaction(self._trname)
         return self._tr
 
     def closetransaction(self):
         """close transaction if created"""
         if self._tr is not None:
             self._tr.close()
 
     def releasetransaction(self):
         """release transaction if created"""
         if self._tr is not None:
             self._tr.release()
 
 def pull(repo, remote, heads=None, force=False):
     pullop = pulloperation(repo, remote, heads, force)
     if pullop.remote.local():
         missing = set(pullop.remote.requirements) - pullop.repo.supported
         if missing:
             msg = _("required features are not"
                     " supported in the destination:"
                     " %s") % (', '.join(sorted(missing)))
             raise util.Abort(msg)
 
     lock = pullop.repo.lock()
     try:
         _pulldiscovery(pullop)
         if (pullop.repo.ui.configbool('experimental', 'bundle2-exp', False)
             and pullop.remote.capable('bundle2-exp')):
             _pullbundle2(pullop)
         if 'changegroup' in pullop.todosteps:
             _pullchangeset(pullop)
         if 'phases' in pullop.todosteps:
             _pullphase(pullop)
         if 'obsmarkers' in pullop.todosteps:
             _pullobsolete(pullop)
         pullop.closetransaction()
     finally:
         pullop.releasetransaction()
         lock.release()
 
     return pullop.cgresult
 
 def _pulldiscovery(pullop):
     """discovery phase for the pull
 
     Current handle changeset discovery only, will change handle all discovery
     at some point."""
     tmp = discovery.findcommonincoming(pullop.repo.unfiltered(),
                                        pullop.remote,
                                        heads=pullop.heads,
                                        force=pullop.force)
     pullop.common, pullop.fetch, pullop.rheads = tmp
 
 def _pullbundle2(pullop):
     """pull data using bundle2
 
     For now, the only supported data are changegroup."""
     remotecaps = bundle2.bundle2caps(pullop.remote)
     kwargs = {'bundlecaps': caps20to10(pullop.repo)}
     # pulling changegroup
     pullop.todosteps.remove('changegroup')
 
     kwargs['common'] = pullop.common
     kwargs['heads'] = pullop.heads or pullop.rheads
     if 'b2x:listkeys' in remotecaps:
         kwargs['listkeys'] = ['phase']
     if not pullop.fetch:
         pullop.repo.ui.status(_("no changes found\n"))
         pullop.cgresult = 0
     else:
         if pullop.heads is None and list(pullop.common) == [nullid]:
             pullop.repo.ui.status(_("requesting all changes\n"))
     _pullbundle2extraprepare(pullop, kwargs)
     if kwargs.keys() == ['format']:
         return # nothing to pull
     bundle = pullop.remote.getbundle('pull', **kwargs)
     try:
         op = bundle2.processbundle(pullop.repo, bundle, pullop.gettransaction)
     except error.BundleValueError, exc:
         raise util.Abort('missing support for %s' % exc)
 
     if pullop.fetch:
         assert len(op.records['changegroup']) == 1
         pullop.cgresult = op.records['changegroup'][0]['return']
 
     # processing phases change
     for namespace, value in op.records['listkeys']:
         if namespace == 'phases':
             _pullapplyphases(pullop, value)
 
 def _pullbundle2extraprepare(pullop, kwargs):
     """hook function so that extensions can extend the getbundle call"""
     pass
 
 def _pullchangeset(pullop):
     """pull changeset from unbundle into the local repo"""
     # We delay the open of the transaction as late as possible so we
     # don't open transaction for nothing or you break future useful
     # rollback call
     pullop.todosteps.remove('changegroup')
     if not pullop.fetch:
             pullop.repo.ui.status(_("no changes found\n"))
             pullop.cgresult = 0
             return
     pullop.gettransaction()
     if pullop.heads is None and list(pullop.common) == [nullid]:
         pullop.repo.ui.status(_("requesting all changes\n"))
     elif pullop.heads is None and pullop.remote.capable('changegroupsubset'):
         # issue1320, avoid a race if remote changed after discovery
         pullop.heads = pullop.rheads
 
     if pullop.remote.capable('getbundle'):
         # TODO: get bundlecaps from remote
         cg = pullop.remote.getbundle('pull', common=pullop.common,
                                      heads=pullop.heads or pullop.rheads)
     elif pullop.heads is None:
         cg = pullop.remote.changegroup(pullop.fetch, 'pull')
     elif not pullop.remote.capable('changegroupsubset'):
         raise util.Abort(_("partial pull cannot be done because "
                            "other repository doesn't support "
                            "changegroupsubset."))
     else:
         cg = pullop.remote.changegroupsubset(pullop.fetch, pullop.heads, 'pull')
     pullop.cgresult = changegroup.addchangegroup(pullop.repo, cg, 'pull',
                                                  pullop.remote.url())
 
 def _pullphase(pullop):
     # Get remote phases data from remote
     remotephases = pullop.remote.listkeys('phases')
     _pullapplyphases(pullop, remotephases)
 
 def _pullapplyphases(pullop, remotephases):
     """apply phase movement from observed remote state"""
     pullop.todosteps.remove('phases')
     publishing = bool(remotephases.get('publishing', False))
     if remotephases and not publishing:
         # remote is new and unpublishing
         pheads, _dr = phases.analyzeremotephases(pullop.repo,
                                                  pullop.pulledsubset,
                                                  remotephases)
         phases.advanceboundary(pullop.repo, phases.public, pheads)
         phases.advanceboundary(pullop.repo, phases.draft,
                                pullop.pulledsubset)
     else:
         # Remote is old or publishing all common changesets
         # should be seen as public
         phases.advanceboundary(pullop.repo, phases.public,
                                pullop.pulledsubset)
 
 def _pullobsolete(pullop):
     """utility function to pull obsolete markers from a remote
 
     The `gettransaction` is function that return the pull transaction, creating
     one if necessary. We return the transaction to inform the calling code that
     a new transaction have been created (when applicable).
 
     Exists mostly to allow overriding for experimentation purpose"""
     pullop.todosteps.remove('obsmarkers')
     tr = None
     if obsolete._enabled:
         pullop.repo.ui.debug('fetching remote obsolete markers\n')
         remoteobs = pullop.remote.listkeys('obsolete')
         if 'dump0' in remoteobs:
             tr = pullop.gettransaction()
             for key in sorted(remoteobs, reverse=True):
                 if key.startswith('dump'):
                     data = base85.b85decode(remoteobs[key])
                     pullop.repo.obsstore.mergemarkers(tr, data)
             pullop.repo.invalidatevolatilesets()
     return tr
 
 def caps20to10(repo):
     """return a set with appropriate options to use bundle20 during getbundle"""
     caps = set(['HG2X'])
     capsblob = bundle2.encodecaps(repo.bundle2caps)
     caps.add('bundle2=' + urllib.quote(capsblob))
     return caps
 
 def getbundle(repo, source, heads=None, common=None, bundlecaps=None,
               **kwargs):
     """return a full bundle (with potentially multiple kind of parts)
 
     Could be a bundle HG10 or a bundle HG2X depending on bundlecaps
     passed. For now, the bundle can contain only changegroup, but this will
     changes when more part type will be available for bundle2.
 
     This is different from changegroup.getbundle that only returns an HG10
     changegroup bundle. They may eventually get reunited in the future when we
     have a clearer idea of the API we what to query different data.
 
     The implementation is at a very early stage and will get massive rework
     when the API of bundle is refined.
     """
     # build changegroup bundle here.
     cg = changegroup.getbundle(repo, source, heads=heads,
                                common=common, bundlecaps=bundlecaps)
     if bundlecaps is None or 'HG2X' not in bundlecaps:
         if kwargs:
             raise ValueError(_('unsupported getbundle arguments: %s')
                              % ', '.join(sorted(kwargs.keys())))
         return cg
     # very crude first implementation,
     # the bundle API will change and the generation will be done lazily.
     b2caps = {}
     for bcaps in bundlecaps:
         if bcaps.startswith('bundle2='):
             blob = urllib.unquote(bcaps[len('bundle2='):])
             b2caps.update(bundle2.decodecaps(blob))
     bundler = bundle2.bundle20(repo.ui, b2caps)
     if cg:
         bundler.newpart('b2x:changegroup', data=cg.getchunks())
     listkeys = kwargs.get('listkeys', ())
     for namespace in listkeys:
         part = bundler.newpart('b2x:listkeys')
         part.addparam('namespace', namespace)
         keys = repo.listkeys(namespace).items()
         part.data = pushkey.encodekeys(keys)
     _getbundleextrapart(bundler, repo, source, heads=heads, common=common,
                         bundlecaps=bundlecaps, **kwargs)
     return util.chunkbuffer(bundler.getchunks())
 
 def _getbundleextrapart(bundler, repo, source, heads=None, common=None,
                         bundlecaps=None, **kwargs):
     """hook function to let extensions add parts to the requested bundle"""
     pass
 
 def check_heads(repo, their_heads, context):
     """check if the heads of a repo have been modified
 
     Used by peer for unbundling.
     """
     heads = repo.heads()
     heads_hash = util.sha1(''.join(sorted(heads))).digest()
     if not (their_heads == ['force'] or their_heads == heads or
             their_heads == ['hashed', heads_hash]):
         # someone else committed/pushed/unbundled while we
         # were transferring data
         raise error.PushRaced('repository changed while %s - '
                               'please try again' % context)
 
 def unbundle(repo, cg, heads, source, url):
     """Apply a bundle to a repo.
 
     this function makes sure the repo is locked during the application and have
     mechanism to check that no push race occurred between the creation of the
     bundle and its application.
 
     If the push was raced as PushRaced exception is raised."""
     r = 0
     # need a transaction when processing a bundle2 stream
     tr = None
     lock = repo.lock()
     try:
         check_heads(repo, heads, 'uploading changes')
         # push can proceed
         if util.safehasattr(cg, 'params'):
             try:
                 tr = repo.transaction('unbundle')
                 tr.hookargs['bundle2-exp'] = '1'
                 r = bundle2.processbundle(repo, cg, lambda: tr).reply
                 cl = repo.unfiltered().changelog
                 p = cl.writepending() and repo.root or ""
                 repo.hook('b2x-pretransactionclose', throw=True, source=source,
                           url=url, pending=p, **tr.hookargs)
                 tr.close()
                 repo.hook('b2x-transactionclose', source=source, url=url,
                           **tr.hookargs)
             except Exception, exc:
                 exc.duringunbundle2 = True
                 raise
         else:
             r = changegroup.addchangegroup(repo, cg, source, url)
     finally:
         if tr is not None:
             tr.release()
         lock.release()
     return r

tests/test-bundle2.t

@@ -1,1107 +1,1106
 
 Create an extension to test bundle2 API
 
   $ cat > bundle2.py << EOF
   > """A small extension to test bundle2 implementation
   > 
   > Current bundle2 implementation is far too limited to be used in any core
   > code. We still need to be able to test it while it grow up.
   > """
   > 
   > try:
   >     import msvcrt
   >     msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
   >     msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
   >     msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)
   > except ImportError:
   >     pass
   > 
   > import sys
   > from mercurial import cmdutil
   > from mercurial import util
   > from mercurial import bundle2
   > from mercurial import scmutil
   > from mercurial import discovery
   > from mercurial import changegroup
   > from mercurial import error
   > cmdtable = {}
   > command = cmdutil.command(cmdtable)
   > 
   > ELEPHANTSSONG = """Patali Dirapata, Cromda Cromda Ripalo, Pata Pata, Ko Ko Ko
   > Bokoro Dipoulito, Rondi Rondi Pepino, Pata Pata, Ko Ko Ko
   > Emana Karassoli, Loucra Loucra Ponponto, Pata Pata, Ko Ko Ko."""
   > assert len(ELEPHANTSSONG) == 178 # future test say 178 bytes, trust it.
   > 
   > @bundle2.parthandler('test:song')
   > def songhandler(op, part):
   >     """handle a "test:song" bundle2 part, printing the lyrics on stdin"""
   >     op.ui.write('The choir starts singing:\n')
   >     verses = 0
   >     for line in part.read().split('\n'):
   >         op.ui.write('    %s\n' % line)
   >         verses += 1
   >     op.records.add('song', {'verses': verses})
   > 
   > @bundle2.parthandler('test:ping')
   > def pinghandler(op, part):
   >     op.ui.write('received ping request (id %i)\n' % part.id)
   >     if op.reply is not None and 'ping-pong' in op.reply.capabilities:
   >         op.ui.write_err('replying to ping request (id %i)\n' % part.id)
   >         op.reply.newpart('test:pong', [('in-reply-to', str(part.id))])
   > 
   > @bundle2.parthandler('test:debugreply')
   > def debugreply(op, part):
   >     """print data about the capacity of the bundle reply"""
   >     if op.reply is None:
   >         op.ui.write('debugreply: no reply\n')
   >     else:
   >         op.ui.write('debugreply: capabilities:\n')
   >         for cap in sorted(op.reply.capabilities):
   >             op.ui.write('debugreply:     %r\n' % cap)
   >             for val in op.reply.capabilities[cap]:
   >                 op.ui.write('debugreply:         %r\n' % val)
   > 
   > @command('bundle2',
   >          [('', 'param', [], 'stream level parameter'),
   >           ('', 'unknown', False, 'include an unknown mandatory part in the bundle'),
   >           ('', 'unknownparams', False, 'include an unknown part parameters in the bundle'),
   >           ('', 'parts', False, 'include some arbitrary parts to the bundle'),
   >           ('', 'reply', False, 'produce a reply bundle'),
   >           ('', 'pushrace', False, 'includes a check:head part with unknown nodes'),
   >           ('r', 'rev', [], 'includes those changeset in the bundle'),],
   >          '[OUTPUTFILE]')
   > def cmdbundle2(ui, repo, path=None, **opts):
   >     """write a bundle2 container on standard ouput"""
   >     bundler = bundle2.bundle20(ui)
   >     for p in opts['param']:
   >         p = p.split('=', 1)
   >         try:
   >             bundler.addparam(*p)
   >         except ValueError, exc:
   >             raise util.Abort('%s' % exc)
   > 
   >     if opts['reply']:
   >         capsstring = 'ping-pong\nelephants=babar,celeste\ncity%3D%21=celeste%2Cville'
   >         bundler.newpart('b2x:replycaps', data=capsstring)
   > 
   >     if opts['pushrace']:
   >         # also serve to test the assignement of data outside of init
   >         part = bundler.newpart('b2x:check:heads')
   >         part.data = '01234567890123456789'
   > 
   >     revs = opts['rev']
   >     if 'rev' in opts:
   >         revs = scmutil.revrange(repo, opts['rev'])
   >         if revs:
   >             # very crude version of a changegroup part creation
   >             bundled = repo.revs('%ld::%ld', revs, revs)
   >             headmissing = [c.node() for c in repo.set('heads(%ld)', revs)]
   >             headcommon  = [c.node() for c in repo.set('parents(%ld) - %ld', revs, revs)]
   >             outgoing = discovery.outgoing(repo.changelog, headcommon, headmissing)
   >             cg = changegroup.getlocalbundle(repo, 'test:bundle2', outgoing, None)
   >             bundler.newpart('b2x:changegroup', data=cg.getchunks())
   > 
   >     if opts['parts']:
   >        bundler.newpart('test:empty')
   >        # add a second one to make sure we handle multiple parts
   >        bundler.newpart('test:empty')
   >        bundler.newpart('test:song', data=ELEPHANTSSONG)
   >        bundler.newpart('test:debugreply')
   >        mathpart = bundler.newpart('test:math')
   >        mathpart.addparam('pi', '3.14')
   >        mathpart.addparam('e', '2.72')
   >        mathpart.addparam('cooking', 'raw', mandatory=False)
   >        mathpart.data = '42'
   >        # advisory known part with unknown mandatory param
   >        bundler.newpart('test:song', [('randomparam','')])
   >     if opts['unknown']:
   >        bundler.newpart('test:UNKNOWN', data='some random content')
   >     if opts['unknownparams']:
   >        bundler.newpart('test:SONG', [('randomparams', '')])
   >     if opts['parts']:
   >        bundler.newpart('test:ping')
   > 
   >     if path is None:
   >        file = sys.stdout
   >     else:
   >         file = open(path, 'w')
   > 
   >     for chunk in bundler.getchunks():
   >         file.write(chunk)
   > 
   > @command('unbundle2', [], '')
   > def cmdunbundle2(ui, repo, replypath=None):
   >     """process a bundle2 stream from stdin on the current repo"""
   >     try:
   >         tr = None
   >         lock = repo.lock()
   >         tr = repo.transaction('processbundle')
   >         try:
   >             unbundler = bundle2.unbundle20(ui, sys.stdin)
   >             op = bundle2.processbundle(repo, unbundler, lambda: tr)
   >             tr.close()
   >         except error.BundleValueError, exc:
   >             raise util.Abort('missing support for %s' % exc)
   >         except error.PushRaced, exc:
   >             raise util.Abort('push race: %s' % exc)
   >     finally:
   >         if tr is not None:
   >             tr.release()
   >         lock.release()
   >         remains = sys.stdin.read()
   >         ui.write('%i unread bytes\n' % len(remains))
   >     if op.records['song']:
   >         totalverses = sum(r['verses'] for r in op.records['song'])
   >         ui.write('%i total verses sung\n' % totalverses)
   >     for rec in op.records['changegroup']:
   >         ui.write('addchangegroup return: %i\n' % rec['return'])
   >     if op.reply is not None and replypath is not None:
   >         file = open(replypath, 'w')
   >         for chunk in op.reply.getchunks():
   >             file.write(chunk)
   > 
   > @command('statbundle2', [], '')
   > def cmdstatbundle2(ui, repo):
   >     """print statistic on the bundle2 container read from stdin"""
   >     unbundler = bundle2.unbundle20(ui, sys.stdin)
   >     try:
   >         params = unbundler.params
   >     except error.BundleValueError, exc:
   >        raise util.Abort('unknown parameters: %s' % exc)
   >     ui.write('options count: %i\n' % len(params))
   >     for key in sorted(params):
   >         ui.write('- %s\n' % key)
   >         value = params[key]
   >         if value is not None:
   >             ui.write('    %s\n' % value)
   >     count = 0
   >     for p in unbundler.iterparts():
   >         count += 1
   >         ui.write('  :%s:\n' % p.type)
   >         ui.write('    mandatory: %i\n' % len(p.mandatoryparams))
   >         ui.write('    advisory: %i\n' % len(p.advisoryparams))
   >         ui.write('    payload: %i bytes\n' % len(p.read()))
   >     ui.write('parts count:   %i\n' % count)
   > EOF
   $ cat >> $HGRCPATH << EOF
   > [extensions]
   > bundle2=$TESTTMP/bundle2.py
   > [experimental]
   > bundle2-exp=True
   > [ui]
   > ssh=python "$TESTDIR/dummyssh"
   > logtemplate={rev}:{node|short} {phase} {author} {desc|firstline}
   > [web]
   > push_ssl = false
   > allow_push = *
   > [phases]
   > publish=False
   > EOF
 
 The extension requires a repo (currently unused)
 
   $ hg init main
   $ cd main
   $ touch a
   $ hg add a
   $ hg commit -m 'a'
 
 
 Empty bundle
 =================
 
 - no option
 - no parts
 
 Test bundling
 
   $ hg bundle2
   HG2X\x00\x00\x00\x00 (no-eol) (esc)
 
 Test unbundling
 
   $ hg bundle2 | hg statbundle2
   options count: 0
   parts count:   0
 
 Test old style bundle are detected and refused
 
   $ hg bundle --all ../bundle.hg
   1 changesets found
   $ hg statbundle2 < ../bundle.hg
   abort: unknown bundle version 10
   [255]
 
 Test parameters
 =================
 
 - some options
 - no parts
 
 advisory parameters, no value
 -------------------------------
 
 Simplest possible parameters form
 
 Test generation simple option
 
   $ hg bundle2 --param 'caution'
   HG2X\x00\x07caution\x00\x00 (no-eol) (esc)
 
 Test unbundling
 
   $ hg bundle2 --param 'caution' | hg statbundle2
   options count: 1
   - caution
   parts count:   0
 
 Test generation multiple option
 
   $ hg bundle2 --param 'caution' --param 'meal'
   HG2X\x00\x0ccaution meal\x00\x00 (no-eol) (esc)
 
 Test unbundling
 
   $ hg bundle2 --param 'caution' --param 'meal' | hg statbundle2
   options count: 2
   - caution
   - meal
   parts count:   0
 
 advisory parameters, with value
 -------------------------------
 
 Test generation
 
   $ hg bundle2 --param 'caution' --param 'meal=vegan' --param 'elephants'
   HG2X\x00\x1ccaution meal=vegan elephants\x00\x00 (no-eol) (esc)
 
 Test unbundling
 
   $ hg bundle2 --param 'caution' --param 'meal=vegan' --param 'elephants' | hg statbundle2
   options count: 3
   - caution
   - elephants
   - meal
       vegan
   parts count:   0
 
 parameter with special char in value
 ---------------------------------------------------
 
 Test generation
 
   $ hg bundle2 --param 'e|! 7/=babar%#==tutu' --param simple
   HG2X\x00)e%7C%21%207/=babar%25%23%3D%3Dtutu simple\x00\x00 (no-eol) (esc)
 
 Test unbundling
 
   $ hg bundle2 --param 'e|! 7/=babar%#==tutu' --param simple | hg statbundle2
   options count: 2
   - e|! 7/
       babar%#==tutu
   - simple
   parts count:   0
 
 Test unknown mandatory option
 ---------------------------------------------------
 
   $ hg bundle2 --param 'Gravity' | hg statbundle2
   abort: unknown parameters: Stream Parameter - Gravity
   [255]
 
 Test debug output
 ---------------------------------------------------
 
 bundling debug
 
   $ hg bundle2 --debug --param 'e|! 7/=babar%#==tutu' --param simple ../out.hg2
   start emission of HG2X stream
   bundle parameter: e%7C%21%207/=babar%25%23%3D%3Dtutu simple
   start of parts
   end of bundle
 
 file content is ok
 
   $ cat ../out.hg2
   HG2X\x00)e%7C%21%207/=babar%25%23%3D%3Dtutu simple\x00\x00 (no-eol) (esc)
 
 unbundling debug
 
   $ hg statbundle2 --debug < ../out.hg2
   start processing of HG2X stream
   reading bundle2 stream parameters
   ignoring unknown parameter 'e|! 7/'
   ignoring unknown parameter 'simple'
   options count: 2
   - e|! 7/
       babar%#==tutu
   - simple
   start extraction of bundle2 parts
   part header size: 0
   end of bundle2 stream
   parts count:   0
 
 
 Test buggy input
 ---------------------------------------------------
 
 empty parameter name
 
   $ hg bundle2 --param '' --quiet
   abort: empty parameter name
   [255]
 
 bad parameter name
 
   $ hg bundle2 --param 42babar
   abort: non letter first character: '42babar'
   [255]
 
 
 Test part
 =================
 
   $ hg bundle2 --parts ../parts.hg2 --debug
   start emission of HG2X stream
   bundle parameter: 
   start of parts
   bundle part: "test:empty"
   bundle part: "test:empty"
   bundle part: "test:song"
   bundle part: "test:debugreply"
   bundle part: "test:math"
   bundle part: "test:song"
   bundle part: "test:ping"
   end of bundle
 
   $ cat ../parts.hg2
   HG2X\x00\x00\x00\x11 (esc)
   test:empty\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x11 (esc)
   test:empty\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x10	test:song\x00\x00\x00\x02\x00\x00\x00\x00\x00\xb2Patali Dirapata, Cromda Cromda Ripalo, Pata Pata, Ko Ko Ko (esc)
   Bokoro Dipoulito, Rondi Rondi Pepino, Pata Pata, Ko Ko Ko
   Emana Karassoli, Loucra Loucra Ponponto, Pata Pata, Ko Ko Ko.\x00\x00\x00\x00\x00\x16\x0ftest:debugreply\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00+	test:math\x00\x00\x00\x04\x02\x01\x02\x04\x01\x04\x07\x03pi3.14e2.72cookingraw\x00\x00\x00\x0242\x00\x00\x00\x00\x00\x1d	test:song\x00\x00\x00\x05\x01\x00\x0b\x00randomparam\x00\x00\x00\x00\x00\x10	test:ping\x00\x00\x00\x06\x00\x00\x00\x00\x00\x00\x00\x00 (no-eol) (esc)
 
 
   $ hg statbundle2 < ../parts.hg2
   options count: 0
     :test:empty:
       mandatory: 0
       advisory: 0
       payload: 0 bytes
     :test:empty:
       mandatory: 0
       advisory: 0
       payload: 0 bytes
     :test:song:
       mandatory: 0
       advisory: 0
       payload: 178 bytes
     :test:debugreply:
       mandatory: 0
       advisory: 0
       payload: 0 bytes
     :test:math:
       mandatory: 2
       advisory: 1
       payload: 2 bytes
     :test:song:
       mandatory: 1
       advisory: 0
       payload: 0 bytes
     :test:ping:
       mandatory: 0
       advisory: 0
       payload: 0 bytes
   parts count:   7
 
   $ hg statbundle2 --debug < ../parts.hg2
   start processing of HG2X stream
   reading bundle2 stream parameters
   options count: 0
   start extraction of bundle2 parts
   part header size: 17
   part type: "test:empty"
   part id: "0"
   part parameters: 0
     :test:empty:
       mandatory: 0
       advisory: 0
   payload chunk size: 0
       payload: 0 bytes
   part header size: 17
   part type: "test:empty"
   part id: "1"
   part parameters: 0
     :test:empty:
       mandatory: 0
       advisory: 0
   payload chunk size: 0
       payload: 0 bytes
   part header size: 16
   part type: "test:song"
   part id: "2"
   part parameters: 0
     :test:song:
       mandatory: 0
       advisory: 0
   payload chunk size: 178
   payload chunk size: 0
       payload: 178 bytes
   part header size: 22
   part type: "test:debugreply"
   part id: "3"
   part parameters: 0
     :test:debugreply:
       mandatory: 0
       advisory: 0
   payload chunk size: 0
       payload: 0 bytes
   part header size: 43
   part type: "test:math"
   part id: "4"
   part parameters: 3
     :test:math:
       mandatory: 2
       advisory: 1
   payload chunk size: 2
   payload chunk size: 0
       payload: 2 bytes
   part header size: 29
   part type: "test:song"
   part id: "5"
   part parameters: 1
     :test:song:
       mandatory: 1
       advisory: 0
   payload chunk size: 0
       payload: 0 bytes
   part header size: 16
   part type: "test:ping"
   part id: "6"
   part parameters: 0
     :test:ping:
       mandatory: 0
       advisory: 0
   payload chunk size: 0
       payload: 0 bytes
   part header size: 0
   end of bundle2 stream
   parts count:   7
 
 Test actual unbundling of test part
 =======================================
 
 Process the bundle
 
   $ hg unbundle2 --debug < ../parts.hg2
   start processing of HG2X stream
   reading bundle2 stream parameters
   start extraction of bundle2 parts
   part header size: 17
   part type: "test:empty"
   part id: "0"
   part parameters: 0
   ignoring unsupported advisory part test:empty
   payload chunk size: 0
   part header size: 17
   part type: "test:empty"
   part id: "1"
   part parameters: 0
   ignoring unsupported advisory part test:empty
   payload chunk size: 0
   part header size: 16
   part type: "test:song"
   part id: "2"
   part parameters: 0
   found a handler for part 'test:song'
   The choir starts singing:
   payload chunk size: 178
   payload chunk size: 0
       Patali Dirapata, Cromda Cromda Ripalo, Pata Pata, Ko Ko Ko
       Bokoro Dipoulito, Rondi Rondi Pepino, Pata Pata, Ko Ko Ko
       Emana Karassoli, Loucra Loucra Ponponto, Pata Pata, Ko Ko Ko.
   part header size: 22
   part type: "test:debugreply"
   part id: "3"
   part parameters: 0
   found a handler for part 'test:debugreply'
   debugreply: no reply
   payload chunk size: 0
   part header size: 43
   part type: "test:math"
   part id: "4"
   part parameters: 3
   ignoring unsupported advisory part test:math
   payload chunk size: 2
   payload chunk size: 0
   part header size: 29
   part type: "test:song"
   part id: "5"
   part parameters: 1
   found a handler for part 'test:song'
   ignoring unsupported advisory part test:song - randomparam
   payload chunk size: 0
   part header size: 16
   part type: "test:ping"
   part id: "6"
   part parameters: 0
   found a handler for part 'test:ping'
   received ping request (id 6)
   payload chunk size: 0
   part header size: 0
   end of bundle2 stream
   0 unread bytes
   3 total verses sung
 
 Unbundle with an unknown mandatory part
 (should abort)
 
   $ hg bundle2 --parts --unknown ../unknown.hg2
 
   $ hg unbundle2 < ../unknown.hg2
   The choir starts singing:
       Patali Dirapata, Cromda Cromda Ripalo, Pata Pata, Ko Ko Ko
       Bokoro Dipoulito, Rondi Rondi Pepino, Pata Pata, Ko Ko Ko
       Emana Karassoli, Loucra Loucra Ponponto, Pata Pata, Ko Ko Ko.
   debugreply: no reply
   0 unread bytes
   abort: missing support for test:unknown
   [255]
 
 Unbundle with an unknown mandatory part parameters
 (should abort)
 
   $ hg bundle2 --unknownparams ../unknown.hg2
 
   $ hg unbundle2 < ../unknown.hg2
   0 unread bytes
   abort: missing support for test:song - randomparams
   [255]
 
 unbundle with a reply
 
   $ hg bundle2 --parts --reply ../parts-reply.hg2
   $ hg unbundle2 ../reply.hg2 < ../parts-reply.hg2
   0 unread bytes
   3 total verses sung
 
 The reply is a bundle
 
   $ cat ../reply.hg2
   HG2X\x00\x00\x00\x1f (esc)
   b2x:output\x00\x00\x00\x00\x00\x01\x0b\x01in-reply-to3\x00\x00\x00\xd9The choir starts singing: (esc)
       Patali Dirapata, Cromda Cromda Ripalo, Pata Pata, Ko Ko Ko
       Bokoro Dipoulito, Rondi Rondi Pepino, Pata Pata, Ko Ko Ko
       Emana Karassoli, Loucra Loucra Ponponto, Pata Pata, Ko Ko Ko.
   \x00\x00\x00\x00\x00\x1f (esc)
   b2x:output\x00\x00\x00\x01\x00\x01\x0b\x01in-reply-to4\x00\x00\x00\xc9debugreply: capabilities: (esc)
   debugreply:     'city=!'
   debugreply:         'celeste,ville'
   debugreply:     'elephants'
   debugreply:         'babar'
   debugreply:         'celeste'
   debugreply:     'ping-pong'
   \x00\x00\x00\x00\x00\x1e	test:pong\x00\x00\x00\x02\x01\x00\x0b\x01in-reply-to7\x00\x00\x00\x00\x00\x1f (esc)
   b2x:output\x00\x00\x00\x03\x00\x01\x0b\x01in-reply-to7\x00\x00\x00=received ping request (id 7) (esc)
   replying to ping request (id 7)
   \x00\x00\x00\x00\x00\x00 (no-eol) (esc)
 
 The reply is valid
 
   $ hg statbundle2 < ../reply.hg2
   options count: 0
     :b2x:output:
       mandatory: 0
       advisory: 1
       payload: 217 bytes
     :b2x:output:
       mandatory: 0
       advisory: 1
       payload: 201 bytes
     :test:pong:
       mandatory: 1
       advisory: 0
       payload: 0 bytes
     :b2x:output:
       mandatory: 0
       advisory: 1
       payload: 61 bytes
   parts count:   4
 
 Unbundle the reply to get the output:
 
   $ hg unbundle2 < ../reply.hg2
   remote: The choir starts singing:
   remote:     Patali Dirapata, Cromda Cromda Ripalo, Pata Pata, Ko Ko Ko
   remote:     Bokoro Dipoulito, Rondi Rondi Pepino, Pata Pata, Ko Ko Ko
   remote:     Emana Karassoli, Loucra Loucra Ponponto, Pata Pata, Ko Ko Ko.
   remote: debugreply: capabilities:
   remote: debugreply:     'city=!'
   remote: debugreply:         'celeste,ville'
   remote: debugreply:     'elephants'
   remote: debugreply:         'babar'
   remote: debugreply:         'celeste'
   remote: debugreply:     'ping-pong'
   remote: received ping request (id 7)
   remote: replying to ping request (id 7)
   0 unread bytes
 
 Test push race detection
 
   $ hg bundle2 --pushrace ../part-race.hg2
 
   $ hg unbundle2 < ../part-race.hg2
   0 unread bytes
   abort: push race: repository changed while pushing - please try again
   [255]
 
 Support for changegroup
 ===================================
 
   $ hg unbundle $TESTDIR/bundles/rebase.hg
   adding changesets
   adding manifests
   adding file changes
   added 8 changesets with 7 changes to 7 files (+3 heads)
   (run 'hg heads' to see heads, 'hg merge' to merge)
 
   $ hg log -G
   o  8:02de42196ebe draft Nicolas Dumazet <[e-mail]> H
   |
   | o  7:eea13746799a draft Nicolas Dumazet <[e-mail]> G
   |/|
   o |  6:24b6387c8c8c draft Nicolas Dumazet <[e-mail]> F
   | |
   | o  5:9520eea781bc draft Nicolas Dumazet <[e-mail]> E
   |/
   | o  4:32af7686d403 draft Nicolas Dumazet <[e-mail]> D
   | |
   | o  3:5fddd98957c8 draft Nicolas Dumazet <[e-mail]> C
   | |
   | o  2:42ccdea3bb16 draft Nicolas Dumazet <[e-mail]> B
   |/
   o  1:cd010b8cd998 draft Nicolas Dumazet <[e-mail]> A
   
   @  0:3903775176ed draft test a
   
 
   $ hg bundle2 --debug --rev '8+7+5+4' ../rev.hg2
   4 changesets found
   list of changesets:
   32af7686d403cf45b5d95f2d70cebea587ac806a
   9520eea781bcca16c1e15acc0ba14335a0e8e5ba
   eea13746799a9e0bfd88f29d3c2e9dc9389f524f
   02de42196ebee42ef284b6780a87cdc96e8eaab6
   start emission of HG2X stream
   bundle parameter: 
   start of parts
   bundle part: "b2x:changegroup"
   bundling: 1/4 changesets (25.00%)
   bundling: 2/4 changesets (50.00%)
   bundling: 3/4 changesets (75.00%)
   bundling: 4/4 changesets (100.00%)
   bundling: 1/4 manifests (25.00%)
   bundling: 2/4 manifests (50.00%)
   bundling: 3/4 manifests (75.00%)
   bundling: 4/4 manifests (100.00%)
   bundling: D 1/3 files (33.33%)
   bundling: E 2/3 files (66.67%)
   bundling: H 3/3 files (100.00%)
   end of bundle
 
   $ cat ../rev.hg2
   HG2X\x00\x00\x00\x16\x0fb2x:changegroup\x00\x00\x00\x00\x00\x00\x00\x00\x06\x13\x00\x00\x00\xa42\xafv\x86\xd4\x03\xcfE\xb5\xd9_-p\xce\xbe\xa5\x87\xac\x80j_\xdd\xd9\x89W\xc8\xa5JMCm\xfe\x1d\xa9\xd8\x7f!\xa1\xb9{\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x002\xafv\x86\xd4\x03\xcfE\xb5\xd9_-p\xce\xbe\xa5\x87\xac\x80j\x00\x00\x00\x00\x00\x00\x00)\x00\x00\x00)6e1f4c47ecb533ffd0c8e52cdc88afb6cd39e20c (esc)
   \x00\x00\x00f\x00\x00\x00h\x00\x00\x00\x02D (esc)
   \x00\x00\x00i\x00\x00\x00j\x00\x00\x00\x01D\x00\x00\x00\xa4\x95 \xee\xa7\x81\xbc\xca\x16\xc1\xe1Z\xcc\x0b\xa1C5\xa0\xe8\xe5\xba\xcd\x01\x0b\x8c\xd9\x98\xf3\x98\x1aZ\x81\x15\xf9O\x8d\xa4\xabP`\x89\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x95 \xee\xa7\x81\xbc\xca\x16\xc1\xe1Z\xcc\x0b\xa1C5\xa0\xe8\xe5\xba\x00\x00\x00\x00\x00\x00\x00)\x00\x00\x00)4dece9c826f69490507b98c6383a3009b295837d (esc)
   \x00\x00\x00f\x00\x00\x00h\x00\x00\x00\x02E (esc)
   \x00\x00\x00i\x00\x00\x00j\x00\x00\x00\x01E\x00\x00\x00\xa2\xee\xa17Fy\x9a\x9e\x0b\xfd\x88\xf2\x9d<.\x9d\xc98\x9fRO$\xb68|\x8c\x8c\xae7\x17\x88\x80\xf3\xfa\x95\xde\xd3\xcb\x1c\xf7\x85\x95 \xee\xa7\x81\xbc\xca\x16\xc1\xe1Z\xcc\x0b\xa1C5\xa0\xe8\xe5\xba\xee\xa17Fy\x9a\x9e\x0b\xfd\x88\xf2\x9d<.\x9d\xc98\x9fRO\x00\x00\x00\x00\x00\x00\x00)\x00\x00\x00)365b93d57fdf4814e2b5911d6bacff2b12014441 (esc)
   \x00\x00\x00f\x00\x00\x00h\x00\x00\x00\x00\x00\x00\x00i\x00\x00\x00j\x00\x00\x00\x01G\x00\x00\x00\xa4\x02\xdeB\x19n\xbe\xe4.\xf2\x84\xb6x (esc)
   \x87\xcd\xc9n\x8e\xaa\xb6$\xb68|\x8c\x8c\xae7\x17\x88\x80\xf3\xfa\x95\xde\xd3\xcb\x1c\xf7\x85\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\xdeB\x19n\xbe\xe4.\xf2\x84\xb6x (esc)
   \x87\xcd\xc9n\x8e\xaa\xb6\x00\x00\x00\x00\x00\x00\x00)\x00\x00\x00)8bee48edc7318541fc0013ee41b089276a8c24bf (esc)
   \x00\x00\x00f\x00\x00\x00f\x00\x00\x00\x02H (esc)
   \x00\x00\x00g\x00\x00\x00h\x00\x00\x00\x01H\x00\x00\x00\x00\x00\x00\x00\x8bn\x1fLG\xec\xb53\xff\xd0\xc8\xe5,\xdc\x88\xaf\xb6\xcd9\xe2\x0cf\xa5\xa0\x18\x17\xfd\xf5#\x9c'8\x02\xb5\xb7a\x8d\x05\x1c\x89\xe4\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x002\xafv\x86\xd4\x03\xcfE\xb5\xd9_-p\xce\xbe\xa5\x87\xac\x80j\x00\x00\x00\x81\x00\x00\x00\x81\x00\x00\x00+D\x00c3f1ca2924c16a19b0656a84900e504e5b0aec2d (esc)
   \x00\x00\x00\x8bM\xec\xe9\xc8&\xf6\x94\x90P{\x98\xc68:0	\xb2\x95\x83}\x00}\x8c\x9d\x88\x84\x13%\xf5\xc6\xb0cq\xb3[N\x8a+\x1a\x83\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x95 \xee\xa7\x81\xbc\xca\x16\xc1\xe1Z\xcc\x0b\xa1C5\xa0\xe8\xe5\xba\x00\x00\x00+\x00\x00\x00\xac\x00\x00\x00+E\x009c6fd0350a6c0d0c49d4a9c5017cf07043f54e58 (esc)
   \x00\x00\x00\x8b6[\x93\xd5\x7f\xdfH\x14\xe2\xb5\x91\x1dk\xac\xff+\x12\x01DA(\xa5\x84\xc6^\xf1!\xf8\x9e\xb6j\xb7\xd0\xbc\x15=\x80\x99\xe7\xceM\xec\xe9\xc8&\xf6\x94\x90P{\x98\xc68:0	\xb2\x95\x83}\xee\xa17Fy\x9a\x9e\x0b\xfd\x88\xf2\x9d<.\x9d\xc98\x9fRO\x00\x00\x00V\x00\x00\x00V\x00\x00\x00+F\x0022bfcfd62a21a3287edbd4d656218d0f525ed76a (esc)
   \x00\x00\x00\x97\x8b\xeeH\xed\xc71\x85A\xfc\x00\x13\xeeA\xb0\x89'j\x8c$\xbf(\xa5\x84\xc6^\xf1!\xf8\x9e\xb6j\xb7\xd0\xbc\x15=\x80\x99\xe7\xce\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\xdeB\x19n\xbe\xe4.\xf2\x84\xb6x (esc)
   \x87\xcd\xc9n\x8e\xaa\xb6\x00\x00\x00+\x00\x00\x00V\x00\x00\x00\x00\x00\x00\x00\x81\x00\x00\x00\x81\x00\x00\x00+H\x008500189e74a9e0475e822093bc7db0d631aeb0b4 (esc)
   \x00\x00\x00\x00\x00\x00\x00\x05D\x00\x00\x00b\xc3\xf1\xca)$\xc1j\x19\xb0ej\x84\x90\x0ePN[ (esc)
   \xec-\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x002\xafv\x86\xd4\x03\xcfE\xb5\xd9_-p\xce\xbe\xa5\x87\xac\x80j\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02D (esc)
   \x00\x00\x00\x00\x00\x00\x00\x05E\x00\x00\x00b\x9co\xd05 (esc)
   l\r (no-eol) (esc)
   \x0cI\xd4\xa9\xc5\x01|\xf0pC\xf5NX\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x95 \xee\xa7\x81\xbc\xca\x16\xc1\xe1Z\xcc\x0b\xa1C5\xa0\xe8\xe5\xba\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02E (esc)
   \x00\x00\x00\x00\x00\x00\x00\x05H\x00\x00\x00b\x85\x00\x18\x9et\xa9\xe0G^\x82 \x93\xbc}\xb0\xd61\xae\xb0\xb4\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\xdeB\x19n\xbe\xe4.\xf2\x84\xb6x (esc)
   \x87\xcd\xc9n\x8e\xaa\xb6\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02H (esc)
   \x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00 (no-eol) (esc)
 
   $ hg unbundle2 < ../rev.hg2
   adding changesets
   adding manifests
   adding file changes
   added 0 changesets with 0 changes to 3 files
   0 unread bytes
   addchangegroup return: 1
 
 with reply
 
   $ hg bundle2 --rev '8+7+5+4' --reply ../rev-rr.hg2
   $ hg unbundle2 ../rev-reply.hg2 < ../rev-rr.hg2
   0 unread bytes
   addchangegroup return: 1
 
   $ cat ../rev-reply.hg2
   HG2X\x00\x00\x003\x15b2x:reply:changegroup\x00\x00\x00\x00\x00\x02\x0b\x01\x06\x01in-reply-to1return1\x00\x00\x00\x00\x00\x1f (esc)
   b2x:output\x00\x00\x00\x01\x00\x01\x0b\x01in-reply-to1\x00\x00\x00dadding changesets (esc)
   adding manifests
   adding file changes
   added 0 changesets with 0 changes to 3 files
   \x00\x00\x00\x00\x00\x00 (no-eol) (esc)
 
 Real world exchange
 =====================
 
 
 clone --pull
 
   $ cd ..
   $ hg -R main phase --public cd010b8cd998
   $ hg clone main other --pull --rev 9520eea781bc
   adding changesets
   adding manifests
   adding file changes
   added 2 changesets with 2 changes to 2 files
   updating to branch default
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg -R other log -G
   @  1:9520eea781bc draft Nicolas Dumazet <[e-mail]> E
   |
   o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]> A
   
 
 pull
 
   $ hg -R main phase --public 9520eea781bc
   $ hg -R other pull -r 24b6387c8c8c
   pulling from $TESTTMP/main (glob)
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   (run 'hg heads' to see heads, 'hg merge' to merge)
   $ hg -R other log -G
   o  2:24b6387c8c8c draft Nicolas Dumazet <[e-mail]> F
   |
   | @  1:9520eea781bc draft Nicolas Dumazet <[e-mail]> E
   |/
   o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]> A
   
 
 pull empty (with phase movement)
 
   $ hg -R main phase --public 24b6387c8c8c
   $ hg -R other pull -r 24b6387c8c8c
   pulling from $TESTTMP/main (glob)
   no changes found
   $ hg -R other log -G
   o  2:24b6387c8c8c public Nicolas Dumazet <[e-mail]> F
   |
   | @  1:9520eea781bc draft Nicolas Dumazet <[e-mail]> E
   |/
   o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]> A
   
 pull empty
 
   $ hg -R other pull -r 24b6387c8c8c
   pulling from $TESTTMP/main (glob)
   no changes found
   $ hg -R other log -G
   o  2:24b6387c8c8c public Nicolas Dumazet <[e-mail]> F
   |
   | @  1:9520eea781bc draft Nicolas Dumazet <[e-mail]> E
   |/
   o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]> A
   
 
 push
 
   $ hg -R main phase --public eea13746799a
   $ hg -R main push other --rev eea13746799a
   pushing to other
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: added 1 changesets with 0 changes to 0 files (-1 heads)
   $ hg -R other log -G
   o    3:eea13746799a public Nicolas Dumazet <[e-mail]> G
   |\
   | o  2:24b6387c8c8c public Nicolas Dumazet <[e-mail]> F
   | |
   @ |  1:9520eea781bc public Nicolas Dumazet <[e-mail]> E
   |/
   o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]> A
   
 
 pull over ssh
 
   $ hg -R other pull ssh://user@dummy/main -r 02de42196ebe --traceback
   pulling from ssh://user@dummy/main
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   (run 'hg heads' to see heads, 'hg merge' to merge)
 
 pull over http
 
   $ hg -R main serve -p $HGPORT -d --pid-file=main.pid -E main-error.log
   $ cat main.pid >> $DAEMON_PIDS
 
   $ hg -R other pull http://localhost:$HGPORT/ -r 42ccdea3bb16
   pulling from http://localhost:$HGPORT/
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   (run 'hg heads .' to see heads, 'hg merge' to merge)
   $ cat main-error.log
 
 push over ssh
 
   $ hg -R main push ssh://user@dummy/other -r 5fddd98957c8
   pushing to ssh://user@dummy/other
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: added 1 changesets with 1 changes to 1 files
   $ hg -R other log -G
   o  6:5fddd98957c8 draft Nicolas Dumazet <[e-mail]> C
   |
   o  5:42ccdea3bb16 draft Nicolas Dumazet <[e-mail]> B
   |
   | o  4:02de42196ebe draft Nicolas Dumazet <[e-mail]> H
   | |
   | | o  3:eea13746799a public Nicolas Dumazet <[e-mail]> G
   | |/|
   | o |  2:24b6387c8c8c public Nicolas Dumazet <[e-mail]> F
   |/ /
   | @  1:9520eea781bc public Nicolas Dumazet <[e-mail]> E
   |/
   o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]> A
   
 
 push over http
 
   $ hg -R other serve -p $HGPORT2 -d --pid-file=other.pid -E other-error.log
   $ cat other.pid >> $DAEMON_PIDS
 
   $ hg -R main phase --public 32af7686d403
   $ hg -R main push http://localhost:$HGPORT2/ -r 32af7686d403
   pushing to http://localhost:$HGPORT2/
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: added 1 changesets with 1 changes to 1 files
   $ cat other-error.log
 
 Check final content.
 
   $ hg -R other log -G
   o  7:32af7686d403 public Nicolas Dumazet <[e-mail]> D
   |
   o  6:5fddd98957c8 public Nicolas Dumazet <[e-mail]> C
   |
   o  5:42ccdea3bb16 public Nicolas Dumazet <[e-mail]> B
   |
   | o  4:02de42196ebe draft Nicolas Dumazet <[e-mail]> H
   | |
   | | o  3:eea13746799a public Nicolas Dumazet <[e-mail]> G
   | |/|
   | o |  2:24b6387c8c8c public Nicolas Dumazet <[e-mail]> F
   |/ /
   | @  1:9520eea781bc public Nicolas Dumazet <[e-mail]> E
   |/
   o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]> A
   
 
 Error Handling
 ==============
 
 Check that errors are properly returned to the client during push.
 
 Setting up
 
   $ cat > failpush.py << EOF
   > """A small extension that makes push fails when using bundle2
   > 
   > used to test error handling in bundle2
   > """
   > 
   > from mercurial import util
   > from mercurial import bundle2
   > from mercurial import exchange
   > from mercurial import extensions
   > 
   > def _pushbundle2failpart(pushop, bundler):
   >     reason = pushop.ui.config('failpush', 'reason', None)
   >     part = None
   >     if reason == 'abort':
   >         bundler.newpart('test:abort')
   >     if reason == 'unknown':
   >         bundler.newpart('TEST:UNKNOWN')
   >     if reason == 'race':
   >         # 20 Bytes of crap
   >         bundler.newpart('b2x:check:heads', data='01234567890123456789')
-  >     return lambda op: None
   > 
   > @bundle2.parthandler("test:abort")
   > def handleabort(op, part):
   >     raise util.Abort('Abandon ship!', hint="don't panic")
   > 
   > def uisetup(ui):
   >     exchange.bundle2partsgenerators.insert(0, _pushbundle2failpart)
   > 
   > EOF
 
   $ cd main
   $ hg up tip
   3 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ echo 'I' > I
   $ hg add I
   $ hg ci -m 'I'
   $ hg id
   e7ec4e813ba6 tip
   $ cd ..
 
   $ cat << EOF >> $HGRCPATH
   > [extensions]
   > failpush=$TESTTMP/failpush.py
   > EOF
 
   $ "$TESTDIR/killdaemons.py" $DAEMON_PIDS
   $ hg -R other serve -p $HGPORT2 -d --pid-file=other.pid -E other-error.log
   $ cat other.pid >> $DAEMON_PIDS
 
 Doing the actual push: Abort error
 
   $ cat << EOF >> $HGRCPATH
   > [failpush]
   > reason = abort
   > EOF
 
   $ hg -R main push other -r e7ec4e813ba6
   pushing to other
   searching for changes
   abort: Abandon ship!
   (don't panic)
   [255]
 
   $ hg -R main push ssh://user@dummy/other -r e7ec4e813ba6
   pushing to ssh://user@dummy/other
   searching for changes
   abort: Abandon ship!
   (don't panic)
   [255]
 
   $ hg -R main push http://localhost:$HGPORT2/ -r e7ec4e813ba6
   pushing to http://localhost:$HGPORT2/
   searching for changes
   abort: Abandon ship!
   (don't panic)
   [255]
 
 
 Doing the actual push: unknown mandatory parts
 
   $ cat << EOF >> $HGRCPATH
   > [failpush]
   > reason = unknown
   > EOF
 
   $ hg -R main push other -r e7ec4e813ba6
   pushing to other
   searching for changes
   abort: missing support for test:unknown
   [255]
 
   $ hg -R main push ssh://user@dummy/other -r e7ec4e813ba6
   pushing to ssh://user@dummy/other
   searching for changes
   abort: missing support for test:unknown
   [255]
 
   $ hg -R main push http://localhost:$HGPORT2/ -r e7ec4e813ba6
   pushing to http://localhost:$HGPORT2/
   searching for changes
   abort: missing support for test:unknown
   [255]
 
 Doing the actual push: race
 
   $ cat << EOF >> $HGRCPATH
   > [failpush]
   > reason = race
   > EOF
 
   $ hg -R main push other -r e7ec4e813ba6
   pushing to other
   searching for changes
   abort: push failed:
   'repository changed while pushing - please try again'
   [255]
 
   $ hg -R main push ssh://user@dummy/other -r e7ec4e813ba6
   pushing to ssh://user@dummy/other
   searching for changes
   abort: push failed:
   'repository changed while pushing - please try again'
   [255]
 
   $ hg -R main push http://localhost:$HGPORT2/ -r e7ec4e813ba6
   pushing to http://localhost:$HGPORT2/
   searching for changes
   abort: push failed:
   'repository changed while pushing - please try again'
   [255]
 
 Doing the actual push: hook abort
 
   $ cat << EOF >> $HGRCPATH
   > [failpush]
   > reason =
   > [hooks]
   > b2x-pretransactionclose.failpush = false
   > EOF
 
   $ "$TESTDIR/killdaemons.py" $DAEMON_PIDS
   $ hg -R other serve -p $HGPORT2 -d --pid-file=other.pid -E other-error.log
   $ cat other.pid >> $DAEMON_PIDS
 
   $ hg -R main push other -r e7ec4e813ba6
   pushing to other
   searching for changes
   transaction abort!
   rollback completed
   abort: b2x-pretransactionclose.failpush hook exited with status 1
   [255]
 
   $ hg -R main push ssh://user@dummy/other -r e7ec4e813ba6
   pushing to ssh://user@dummy/other
   searching for changes
   abort: b2x-pretransactionclose.failpush hook exited with status 1
   remote: transaction abort!
   remote: rollback completed
   [255]
 
   $ hg -R main push http://localhost:$HGPORT2/ -r e7ec4e813ba6
   pushing to http://localhost:$HGPORT2/
   searching for changes
   abort: b2x-pretransactionclose.failpush hook exited with status 1
   [255]