view mercurial/exchange.py @ 20345:8567b4ea76ac

exchange: extract push function from localrepo

The localrepo class if far too big. Push and pull logic will be extracted and
reworked to better fit with the fact they now exchange more than plain changeset
bundle.

This changeset extract the push code. later changeset will slowly slice this
over 200 hundred lines and 8 indentation level function into smaller saner
brick.

The localrepo.push method is kept for now to limit impact on user code. But it
will be ultimately removed, now that the public supposed API is hold by peer.

# exchange.py - utily to exchange data between repo.
#
# 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
import errno
import util, scmutil, changegroup
import discovery, phases, obsolete, bookmarks

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()
    '''
    if remote.local():
        missing = set(repo.requirements) - 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 remote.canpush():
        raise util.Abort(_("destination does not support push"))
    unfi = repo.unfiltered()
    def localphasemove(nodes, phase=phases.public):
        """move <nodes> to <phase> in the local source repo"""
        if locallock is not None:
            phases.advanceboundary(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 < repo[n].phase()]
            phasestr = phases.phasenames[phase]
            if actualmoves:
                repo.ui.status(_('cannot lock source repo, skipping local'
                                 ' %s phase update\n') % phasestr)
    # get local lock as we might write phase data
    locallock = None
    try:
        locallock = repo.lock()
    except IOError, err:
        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
        repo.ui.debug(msg)
    try:
        repo.checkpush(force, revs)
        lock = None
        unbundle = remote.capable('unbundle')
        if not unbundle:
            lock = remote.lock()
        try:
            # discovery
            fci = discovery.findcommonincoming
            commoninc = fci(unfi, remote, force=force)
            common, inc, remoteheads = commoninc
            fco = discovery.findcommonoutgoing
            outgoing = fco(unfi, remote, onlyheads=revs,
                           commoninc=commoninc, force=force)


            if not outgoing.missing:
                # nothing to push
                scmutil.nochangesfound(unfi.ui, unfi, outgoing.excluded)
                ret = None
            else:
                # something to push
                if not 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 = repo.ui.configlist('bookmarks', 'pushing')
                    discovery.checkheads(unfi, remote, outgoing,
                                         remoteheads, newbranch,
                                         bool(inc), newbm)

                # TODO: get bundlecaps from remote
                bundlecaps = None
                # create a changegroup from local
                if revs is None and not (outgoing.excluded
                                         or repo.changelog.filteredrevs):
                    # push everything,
                    # use the fast path, no race possible on push
                    bundler = changegroup.bundle10(repo, bundlecaps)
                    cg = repo._changegroupsubset(outgoing,
                                                 bundler,
                                                 'push',
                                                 fastpath=True)
                else:
                    cg = repo.getlocalbundle('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 force:
                        remoteheads = ['force']
                    # ssh: return remote's addchangegroup()
                    # http: return remote's addchangegroup() or 0 for error
                    ret = remote.unbundle(cg, remoteheads, 'push')
                else:
                    # we return an integer indicating remote head count
                    # change
                    ret = remote.addchangegroup(cg, 'push', repo.url())

            if ret:
                # push succeed, synchronize target of the push
                cheads = outgoing.missingheads
            elif revs is None:
                # All out push fails. synchronize all common
                cheads = 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(outgoing.common)
                nm = repo.changelog.nodemap
                cheads = [node for node in revs if nm[node] in common]
                # and
                # * commonheads parents on missing
                revset = unfi.set('%ln and parents(roots(%ln))',
                                 outgoing.commonheads,
                                 outgoing.missing)
                cheads.extend(c.node() for c in revset)
            # even when we don't push, exchanging phase data is useful
            remotephases = remote.listkeys('phases')
            if (repo.ui.configbool('ui', '_usedassubrepo', False)
                and remotephases    # server supports phases
                and 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 repo
                localphasemove(cheads)
                # don't push any phase data as there is nothing to push
            else:
                ana = phases.analyzeremotephases(repo, cheads, remotephases)
                pheads, droots = ana
                ### Apply remote phase on local
                if remotephases.get('publishing', False):
                    localphasemove(cheads)
                else: # publish = False
                    localphasemove(pheads)
                    localphasemove(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)
                for newremotehead in outdated:
                    r = remote.pushkey('phases',
                                       newremotehead.hex(),
                                       str(phases.draft),
                                       str(phases.public))
                    if not r:
                        repo.ui.warn(_('updating %s to public failed!\n')
                                        % newremotehead)
            repo.ui.debug('try to push obsolete markers to remote\n')
            obsolete.syncpush(repo, remote)
        finally:
            if lock is not None:
                lock.release()
    finally:
        if locallock is not None:
            locallock.release()

    bookmarks.updateremote(repo.ui, unfi, remote, revs)
    return ret