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# discovery.py - protocol changeset discovery functions
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#
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# Copyright 2010 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import functools
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from .i18n import _
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from .node import (
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hex,
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nullid,
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short,
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)
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from . import (
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bookmarks,
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branchmap,
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error,
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phases,
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setdiscovery,
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treediscovery,
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util,
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)
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def findcommonincoming(repo, remote, heads=None, force=False):
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"""Return a tuple (common, anyincoming, heads) used to identify the common
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subset of nodes between repo and remote.
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"common" is a list of (at least) the heads of the common subset.
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"anyincoming" is testable as a boolean indicating if any nodes are missing
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locally. If remote does not support getbundle, this actually is a list of
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roots of the nodes that would be incoming, to be supplied to
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changegroupsubset. No code except for pull should be relying on this fact
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any longer.
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"heads" is either the supplied heads, or else the remote's heads.
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If you pass heads and they are all known locally, the response lists just
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these heads in "common" and in "heads".
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Please use findcommonoutgoing to compute the set of outgoing nodes to give
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extensions a good hook into outgoing.
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"""
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if not remote.capable('getbundle'):
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return treediscovery.findcommonincoming(repo, remote, heads, force)
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if heads:
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allknown = True
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knownnode = repo.changelog.hasnode # no nodemap until it is filtered
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for h in heads:
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if not knownnode(h):
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allknown = False
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break
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if allknown:
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return (heads, False, heads)
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res = setdiscovery.findcommonheads(repo.ui, repo, remote,
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abortwhenunrelated=not force)
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common, anyinc, srvheads = res
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return (list(common), anyinc, heads or list(srvheads))
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class outgoing(object):
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'''Represents the set of nodes present in a local repo but not in a
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(possibly) remote one.
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Members:
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missing is a list of all nodes present in local but not in remote.
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common is a list of all nodes shared between the two repos.
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excluded is the list of missing changeset that shouldn't be sent remotely.
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missingheads is the list of heads of missing.
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commonheads is the list of heads of common.
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The sets are computed on demand from the heads, unless provided upfront
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by discovery.'''
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def __init__(self, repo, commonheads=None, missingheads=None,
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missingroots=None):
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# at least one of them must not be set
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assert None in (commonheads, missingroots)
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cl = repo.changelog
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if missingheads is None:
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missingheads = cl.heads()
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if missingroots:
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discbases = []
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for n in missingroots:
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discbases.extend([p for p in cl.parents(n) if p != nullid])
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# TODO remove call to nodesbetween.
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# TODO populate attributes on outgoing instance instead of setting
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# discbases.
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csets, roots, heads = cl.nodesbetween(missingroots, missingheads)
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included = set(csets)
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missingheads = heads
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commonheads = [n for n in discbases if n not in included]
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elif not commonheads:
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commonheads = [nullid]
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self.commonheads = commonheads
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self.missingheads = missingheads
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self._revlog = cl
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self._common = None
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self._missing = None
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self.excluded = []
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def _computecommonmissing(self):
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sets = self._revlog.findcommonmissing(self.commonheads,
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self.missingheads)
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self._common, self._missing = sets
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@util.propertycache
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def common(self):
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if self._common is None:
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self._computecommonmissing()
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return self._common
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@util.propertycache
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def missing(self):
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if self._missing is None:
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self._computecommonmissing()
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return self._missing
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def findcommonoutgoing(repo, other, onlyheads=None, force=False,
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commoninc=None, portable=False):
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'''Return an outgoing instance to identify the nodes present in repo but
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not in other.
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If onlyheads is given, only nodes ancestral to nodes in onlyheads
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(inclusive) are included. If you already know the local repo's heads,
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passing them in onlyheads is faster than letting them be recomputed here.
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If commoninc is given, it must be the result of a prior call to
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findcommonincoming(repo, other, force) to avoid recomputing it here.
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If portable is given, compute more conservative common and missingheads,
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to make bundles created from the instance more portable.'''
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# declare an empty outgoing object to be filled later
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og = outgoing(repo, None, None)
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# get common set if not provided
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if commoninc is None:
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commoninc = findcommonincoming(repo, other, force=force)
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og.commonheads, _any, _hds = commoninc
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# compute outgoing
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mayexclude = (repo._phasecache.phaseroots[phases.secret] or repo.obsstore)
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if not mayexclude:
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og.missingheads = onlyheads or repo.heads()
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elif onlyheads is None:
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# use visible heads as it should be cached
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og.missingheads = repo.filtered("served").heads()
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og.excluded = [ctx.node() for ctx in repo.set('secret() or extinct()')]
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else:
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# compute common, missing and exclude secret stuff
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sets = repo.changelog.findcommonmissing(og.commonheads, onlyheads)
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og._common, allmissing = sets
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og._missing = missing = []
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og.excluded = excluded = []
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for node in allmissing:
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ctx = repo[node]
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if ctx.phase() >= phases.secret or ctx.extinct():
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excluded.append(node)
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else:
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missing.append(node)
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if len(missing) == len(allmissing):
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missingheads = onlyheads
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else: # update missing heads
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missingheads = phases.newheads(repo, onlyheads, excluded)
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og.missingheads = missingheads
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if portable:
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# recompute common and missingheads as if -r<rev> had been given for
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# each head of missing, and --base <rev> for each head of the proper
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# ancestors of missing
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og._computecommonmissing()
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cl = repo.changelog
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missingrevs = set(cl.rev(n) for n in og._missing)
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og._common = set(cl.ancestors(missingrevs)) - missingrevs
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commonheads = set(og.commonheads)
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og.missingheads = [h for h in og.missingheads if h not in commonheads]
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return og
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def _headssummary(repo, remote, outgoing):
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"""compute a summary of branch and heads status before and after push
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return {'branch': ([remoteheads], [newheads], [unsyncedheads])} mapping
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- branch: the branch name
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- remoteheads: the list of remote heads known locally
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None if the branch is new
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- newheads: the new remote heads (known locally) with outgoing pushed
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- unsyncedheads: the list of remote heads unknown locally.
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"""
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cl = repo.changelog
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headssum = {}
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# A. Create set of branches involved in the push.
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branches = set(repo[n].branch() for n in outgoing.missing)
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remotemap = remote.branchmap()
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newbranches = branches - set(remotemap)
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branches.difference_update(newbranches)
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# A. register remote heads
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remotebranches = set()
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for branch, heads in remote.branchmap().iteritems():
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remotebranches.add(branch)
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known = []
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unsynced = []
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knownnode = cl.hasnode # do not use nodemap until it is filtered
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for h in heads:
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if knownnode(h):
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known.append(h)
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else:
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unsynced.append(h)
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headssum[branch] = (known, list(known), unsynced)
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# B. add new branch data
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missingctx = list(repo[n] for n in outgoing.missing)
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touchedbranches = set()
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for ctx in missingctx:
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branch = ctx.branch()
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touchedbranches.add(branch)
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if branch not in headssum:
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headssum[branch] = (None, [], [])
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# C drop data about untouched branches:
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for branch in remotebranches - touchedbranches:
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del headssum[branch]
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# D. Update newmap with outgoing changes.
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# This will possibly add new heads and remove existing ones.
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newmap = branchmap.branchcache((branch, heads[1])
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for branch, heads in headssum.iteritems()
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if heads[0] is not None)
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newmap.update(repo, (ctx.rev() for ctx in missingctx))
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for branch, newheads in newmap.iteritems():
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headssum[branch][1][:] = newheads
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for branch, items in headssum.iteritems():
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for l in items:
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if l is not None:
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l.sort()
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return headssum
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def _oldheadssummary(repo, remoteheads, outgoing, inc=False):
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"""Compute branchmapsummary for repo without branchmap support"""
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# 1-4b. old servers: Check for new topological heads.
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# Construct {old,new}map with branch = None (topological branch).
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# (code based on update)
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knownnode = repo.changelog.hasnode # no nodemap until it is filtered
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oldheads = sorted(h for h in remoteheads if knownnode(h))
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# all nodes in outgoing.missing are children of either:
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# - an element of oldheads
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# - another element of outgoing.missing
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# - nullrev
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# This explains why the new head are very simple to compute.
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r = repo.set('heads(%ln + %ln)', oldheads, outgoing.missing)
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newheads = sorted(c.node() for c in r)
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# set some unsynced head to issue the "unsynced changes" warning
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if inc:
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unsynced = [None]
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else:
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unsynced = []
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return {None: (oldheads, newheads, unsynced)}
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def _nowarnheads(pushop):
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# Compute newly pushed bookmarks. We don't warn about bookmarked heads.
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repo = pushop.repo.unfiltered()
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remote = pushop.remote
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localbookmarks = repo._bookmarks
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remotebookmarks = remote.listkeys('bookmarks')
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bookmarkedheads = set()
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# internal config: bookmarks.pushing
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newbookmarks = [localbookmarks.expandname(b)
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for b in pushop.ui.configlist('bookmarks', 'pushing')]
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for bm in localbookmarks:
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rnode = remotebookmarks.get(bm)
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if rnode and rnode in repo:
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lctx, rctx = repo[bm], repo[rnode]
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if bookmarks.validdest(repo, rctx, lctx):
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bookmarkedheads.add(lctx.node())
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else:
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if bm in newbookmarks and bm not in remotebookmarks:
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bookmarkedheads.add(repo[bm].node())
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return bookmarkedheads
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def checkheads(pushop):
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"""Check that a push won't add any outgoing head
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raise Abort error and display ui message as needed.
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"""
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repo = pushop.repo.unfiltered()
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remote = pushop.remote
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outgoing = pushop.outgoing
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remoteheads = pushop.remoteheads
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newbranch = pushop.newbranch
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inc = bool(pushop.incoming)
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# Check for each named branch if we're creating new remote heads.
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# To be a remote head after push, node must be either:
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# - unknown locally
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# - a local outgoing head descended from update
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# - a remote head that's known locally and not
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# ancestral to an outgoing head
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if remoteheads == [nullid]:
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# remote is empty, nothing to check.
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return
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if remote.capable('branchmap'):
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headssum = _headssummary(repo, remote, outgoing)
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else:
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headssum = _oldheadssummary(repo, remoteheads, outgoing, inc)
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newbranches = [branch for branch, heads in headssum.iteritems()
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if heads[0] is None]
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# 1. Check for new branches on the remote.
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if newbranches and not newbranch: # new branch requires --new-branch
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branchnames = ', '.join(sorted(newbranches))
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raise error.Abort(_("push creates new remote branches: %s!")
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% branchnames,
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hint=_("use 'hg push --new-branch' to create"
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" new remote branches"))
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# 2. Find heads that we need not warn about
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nowarnheads = _nowarnheads(pushop)
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# 3. Check for new heads.
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# If there are more heads after the push than before, a suitable
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# error message, depending on unsynced status, is displayed.
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errormsg = None
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# If there is no obsstore, allfuturecommon won't be used, so no
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# need to compute it.
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if repo.obsstore:
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allmissing = set(outgoing.missing)
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cctx = repo.set('%ld', outgoing.common)
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allfuturecommon = set(c.node() for c in cctx)
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allfuturecommon.update(allmissing)
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for branch, heads in sorted(headssum.iteritems()):
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remoteheads, newheads, unsyncedheads = heads
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candidate_newhs = set(newheads)
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# add unsynced data
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if remoteheads is None:
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oldhs = set()
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else:
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oldhs = set(remoteheads)
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oldhs.update(unsyncedheads)
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candidate_newhs.update(unsyncedheads)
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dhs = None # delta heads, the new heads on branch
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if not repo.obsstore:
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discardedheads = set()
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newhs = candidate_newhs
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else:
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newhs, discardedheads = _postprocessobsolete(pushop,
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allfuturecommon,
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candidate_newhs)
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unsynced = sorted(h for h in unsyncedheads if h not in discardedheads)
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if unsynced:
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if None in unsynced:
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# old remote, no heads data
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heads = None
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elif len(unsynced) <= 4 or repo.ui.verbose:
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heads = ' '.join(short(h) for h in unsynced)
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else:
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heads = (' '.join(short(h) for h in unsynced[:4]) +
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' ' + _("and %s others") % (len(unsynced) - 4))
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if heads is None:
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repo.ui.status(_("remote has heads that are "
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"not known locally\n"))
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elif branch is None:
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repo.ui.status(_("remote has heads that are "
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"not known locally: %s\n") % heads)
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else:
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repo.ui.status(_("remote has heads on branch '%s' that are "
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"not known locally: %s\n") % (branch, heads))
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if remoteheads is None:
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if len(newhs) > 1:
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dhs = list(newhs)
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if errormsg is None:
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errormsg = (_("push creates new branch '%s' "
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"with multiple heads") % (branch))
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hint = _("merge or"
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" see 'hg help push' for details about"
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" pushing new heads")
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elif len(newhs) > len(oldhs):
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# remove bookmarked or existing remote heads from the new heads list
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dhs = sorted(newhs - nowarnheads - oldhs)
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if dhs:
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if errormsg is None:
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if branch not in ('default', None):
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errormsg = _("push creates new remote head %s "
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"on branch '%s'!") % (short(dhs[0]), branch)
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elif repo[dhs[0]].bookmarks():
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errormsg = _("push creates new remote head %s "
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"with bookmark '%s'!") % (
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short(dhs[0]), repo[dhs[0]].bookmarks()[0])
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else:
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errormsg = _("push creates new remote head %s!"
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) % short(dhs[0])
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if unsyncedheads:
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hint = _("pull and merge or"
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" see 'hg help push' for details about"
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" pushing new heads")
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else:
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hint = _("merge or"
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" see 'hg help push' for details about"
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" pushing new heads")
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if branch is None:
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repo.ui.note(_("new remote heads:\n"))
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else:
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repo.ui.note(_("new remote heads on branch '%s':\n") % branch)
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for h in dhs:
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repo.ui.note((" %s\n") % short(h))
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if errormsg:
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raise error.Abort(errormsg, hint=hint)
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def _postprocessobsolete(pushop, futurecommon, candidate_newhs):
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"""post process the list of new heads with obsolescence information
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Exists as a sub-function to contain the complexity and allow extensions to
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experiment with smarter logic.
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Returns (newheads, discarded_heads) tuple
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"""
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# known issue
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#
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# * We "silently" skip processing on all changeset unknown locally
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#
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# * if <nh> is public on the remote, it won't be affected by obsolete
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# marker and a new is created
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# define various utilities and containers
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repo = pushop.repo
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unfi = repo.unfiltered()
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tonode = unfi.changelog.node
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torev = unfi.changelog.rev
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public = phases.public
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getphase = unfi._phasecache.phase
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ispublic = (lambda r: getphase(unfi, r) == public)
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hasoutmarker = functools.partial(pushingmarkerfor, unfi.obsstore,
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futurecommon)
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successorsmarkers = unfi.obsstore.successors
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newhs = set() # final set of new heads
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discarded = set() # new head of fully replaced branch
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localcandidate = set() # candidate heads known locally
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unknownheads = set() # candidate heads unknown locally
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for h in candidate_newhs:
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if h in unfi:
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localcandidate.add(h)
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else:
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if successorsmarkers.get(h) is not None:
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msg = ('checkheads: remote head unknown locally has'
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' local marker: %s\n')
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repo.ui.debug(msg % hex(h))
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unknownheads.add(h)
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# fast path the simple case
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if len(localcandidate) == 1:
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return unknownheads | set(candidate_newhs), set()
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# actually process branch replacement
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while localcandidate:
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nh = localcandidate.pop()
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# run this check early to skip the evaluation of the whole branch
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if (nh in futurecommon or ispublic(torev(nh))):
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newhs.add(nh)
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continue
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# Get all revs/nodes on the branch exclusive to this head
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# (already filtered heads are "ignored"))
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branchrevs = unfi.revs('only(%n, (%ln+%ln))',
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nh, localcandidate, newhs)
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branchnodes = [tonode(r) for r in branchrevs]
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# The branch won't be hidden on the remote if
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# * any part of it is public,
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# * any part of it is considered part of the result by previous logic,
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# * if we have no markers to push to obsolete it.
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if (any(ispublic(r) for r in branchrevs)
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or any(n in futurecommon for n in branchnodes)
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or any(not hasoutmarker(n) for n in branchnodes)):
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newhs.add(nh)
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else:
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# note: there is a corner case if there is a merge in the branch.
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# we might end up with -more- heads. However, these heads are not
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# "added" by the push, but more by the "removal" on the remote so I
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# think is a okay to ignore them,
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discarded.add(nh)
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newhs |= unknownheads
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return newhs, discarded
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def pushingmarkerfor(obsstore, pushset, node):
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"""true if some markers are to be pushed for node
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We cannot just look in to the pushed obsmarkers from the pushop because
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discovery might have filtered relevant markers. In addition listing all
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markers relevant to all changesets in the pushed set would be too expensive
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(O(len(repo)))
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(note: There are cache opportunity in this function. but it would requires
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a two dimensional stack.)
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"""
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successorsmarkers = obsstore.successors
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stack = [node]
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seen = set(stack)
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while stack:
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current = stack.pop()
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if current in pushset:
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return True
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markers = successorsmarkers.get(current, ())
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# markers fields = ('prec', 'succs', 'flag', 'meta', 'date', 'parents')
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for m in markers:
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nexts = m[1] # successors
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if not nexts: # this is a prune marker
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nexts = m[5] or () # parents
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for n in nexts:
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if n not in seen:
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seen.add(n)
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stack.append(n)
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return False
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