Mercurial > hg
view mercurial/exchange.py @ 21068:c15b66a6bbb4
bundle2: return a stream from exchange.getbundle
For friendliness with the wire protocol implementation, the `exchange.getbundle` now
returns a binary stream when asked for a bundle2. We detect a bundle2 request and
upgrade the binary stream to an unbundler object.
In the future the unbundler may gain feature to look like a binary stream, but
we are not quite there yet.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
---|---|
date | Tue, 15 Apr 2014 11:27:55 -0400 |
parents | 7974aa88868e |
children | 408877d491fb |
line wrap: on
line source
# exchange.py - utility to exchange data between repos. # # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> # # 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 import util, scmutil, changegroup, base85 import discovery, phases, obsolete, bookmarks, bundle2 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 == '20': 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 # 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 _pushcheckoutgoing(pushop): pushop.repo.prepushoutgoinghooks(pushop.repo, pushop.remote, pushop.outgoing) if pushop.remote.capable('bundle2'): _pushbundle2(pushop) else: _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 _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.""" # Send known head to the server for race detection. bundler = bundle2.bundle20(pushop.ui) if not pushop.force: part = bundle2.bundlepart('CHECK:HEADS', data=iter(pushop.remoteheads)) bundler.addpart(part) # add the changegroup bundle cg = changegroup.getlocalbundle(pushop.repo, 'push', pushop.outgoing) cgpart = bundle2.bundlepart('CHANGEGROUP', data=cg.getchunks()) bundler.addpart(cgpart) stream = util.chunkbuffer(bundler.getchunks()) sent = bundle2.unbundle20(pushop.repo.ui, stream) reply = pushop.remote.unbundle(sent, ['force'], 'push') try: op = bundle2.processbundle(pushop.repo, reply) except KeyError, exc: raise util.Abort('missing support for %s' % exc) cgreplies = op.records.getreplies(cgpart.id) assert len(cgreplies['changegroup']) == 1 pushop.ret = cgreplies['changegroup'][0]['return'] def _pushchangeset(pushop): """Make the actual push of changeset bundle to remote repo""" 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, 'push') 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 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 # 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) 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.remote.capable('bundle2'): _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.""" kwargs = {'bundlecaps': set(['HG20'])} # pulling changegroup pullop.todosteps.remove('changegroup') if not pullop.fetch: pullop.repo.ui.status(_("no changes found\n")) pullop.cgresult = 0 else: kwargs['common'] = pullop.common kwargs['heads'] = pullop.heads or pullop.rheads if pullop.heads is None and list(pullop.common) == [nullid]: pullop.repo.ui.status(_("requesting all changes\n")) if kwargs.keys() == ['format']: return # nothing to pull bundle = pullop.remote.getbundle('pull', **kwargs) try: op = bundle2.processbundle(pullop.repo, bundle, pullop.gettransaction) except KeyError, exc: raise util.Abort('missing support for %s' % exc) assert len(op.records['changegroup']) == 1 pullop.cgresult = op.records['changegroup'][0]['return'] 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 pullop.todosteps.remove('phases') remotephases = pullop.remote.listkeys('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 getbundle(repo, source, heads=None, common=None, bundlecaps=None): """return a full bundle (with potentially multiple kind of parts) Could be a bundle HG10 or a bundle HG20 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 bundle here. cg = changegroup.getbundle(repo, source, heads=heads, common=common, bundlecaps=bundlecaps) if bundlecaps is None or 'HG20' not in bundlecaps: return cg # very crude first implementation, # the bundle API will change and the generation will be done lazily. bundler = bundle2.bundle20(repo.ui) part = bundle2.bundlepart('changegroup', data=cg.getchunks()) bundler.addpart(part) return util.chunkbuffer(bundler.getchunks()) class PushRaced(RuntimeError): """An exception raised during unbundling that indicate a push race""" 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 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'): tr = repo.transaction('unbundle') ret = bundle2.processbundle(repo, cg, lambda: tr) tr.close() stream = util.chunkbuffer(ret.reply.getchunks()) r = bundle2.unbundle20(repo.ui, stream) else: r = changegroup.addchangegroup(repo, cg, source, url) finally: if tr is not None: tr.release() lock.release() return r