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# discovery.py - protocol changeset discovery functions
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#
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# Copyright 2010 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from node import nullid, short
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from i18n import _
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import util, setdiscovery, treediscovery
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def findcommonincoming(repo, remote, heads=None, force=False):
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"""Return a tuple (common, anyincoming, heads) used to identify the common
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subset of nodes between repo and remote.
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"common" is a list of (at least) the heads of the common subset.
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"anyincoming" is testable as a boolean indicating if any nodes are missing
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locally. If remote does not support getbundle, this actually is a list of
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roots of the nodes that would be incoming, to be supplied to
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changegroupsubset. No code except for pull should be relying on this fact
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any longer.
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"heads" is either the supplied heads, or else the remote's heads.
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If you pass heads and they are all known locally, the reponse lists justs
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these heads in "common" and in "heads".
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Please use findcommonoutgoing to compute the set of outgoing nodes to give
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extensions a good hook into outgoing.
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"""
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if not remote.capable('getbundle'):
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return treediscovery.findcommonincoming(repo, remote, heads, force)
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if heads:
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allknown = True
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nm = repo.changelog.nodemap
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for h in heads:
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if nm.get(h) is None:
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allknown = False
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break
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if allknown:
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return (heads, False, heads)
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res = setdiscovery.findcommonheads(repo.ui, repo, remote,
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abortwhenunrelated=not force)
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common, anyinc, srvheads = res
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return (list(common), anyinc, heads or list(srvheads))
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def findcommonoutgoing(repo, other, onlyheads=None, force=False, commoninc=None):
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'''Return a tuple (common, anyoutgoing, heads) used to identify the set
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of nodes present in repo but not in other.
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If onlyheads is given, only nodes ancestral to nodes in onlyheads (inclusive)
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are included. If you already know the local repo's heads, passing them in
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onlyheads is faster than letting them be recomputed here.
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If commoninc is given, it must the the result of a prior call to
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findcommonincoming(repo, other, force) to avoid recomputing it here.
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The returned tuple is meant to be passed to changelog.findmissing.'''
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common, _any, _hds = commoninc or findcommonincoming(repo, other, force=force)
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return (common, onlyheads or repo.heads())
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def prepush(repo, remote, force, revs, newbranch):
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'''Analyze the local and remote repositories and determine which
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changesets need to be pushed to the remote. Return value depends
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on circumstances:
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If we are not going to push anything, return a tuple (None,
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outgoing) where outgoing is 0 if there are no outgoing
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changesets and 1 if there are, but we refuse to push them
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(e.g. would create new remote heads).
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Otherwise, return a tuple (changegroup, remoteheads), where
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changegroup is a readable file-like object whose read() returns
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successive changegroup chunks ready to be sent over the wire and
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remoteheads is the list of remote heads.'''
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commoninc = findcommonincoming(repo, remote, force=force)
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common, revs = findcommonoutgoing(repo, remote, onlyheads=revs,
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commoninc=commoninc, force=force)
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_common, inc, remoteheads = commoninc
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cl = repo.changelog
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outg = cl.findmissing(common, revs)
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if not outg:
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repo.ui.status(_("no changes found\n"))
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return None, 1
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if not force and remoteheads != [nullid]:
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if remote.capable('branchmap'):
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# Check for each named branch if we're creating new remote heads.
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# To be a remote head after push, node must be either:
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# - unknown locally
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# - a local outgoing head descended from update
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# - a remote head that's known locally and not
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# ancestral to an outgoing head
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# 1. Create set of branches involved in the push.
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branches = set(repo[n].branch() for n in outg)
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# 2. Check for new branches on the remote.
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remotemap = remote.branchmap()
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newbranches = branches - set(remotemap)
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if newbranches and not newbranch: # new branch requires --new-branch
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branchnames = ', '.join(sorted(newbranches))
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raise util.Abort(_("push creates new remote branches: %s!")
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% branchnames,
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hint=_("use 'hg push --new-branch' to create"
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" new remote branches"))
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branches.difference_update(newbranches)
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# 3. Construct the initial oldmap and newmap dicts.
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# They contain information about the remote heads before and
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# after the push, respectively.
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# Heads not found locally are not included in either dict,
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# since they won't be affected by the push.
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# unsynced contains all branches with incoming changesets.
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oldmap = {}
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newmap = {}
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unsynced = set()
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for branch in branches:
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remotebrheads = remotemap[branch]
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prunedbrheads = [h for h in remotebrheads if h in cl.nodemap]
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oldmap[branch] = prunedbrheads
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newmap[branch] = list(prunedbrheads)
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if len(remotebrheads) > len(prunedbrheads):
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unsynced.add(branch)
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# 4. Update newmap with outgoing changes.
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# This will possibly add new heads and remove existing ones.
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ctxgen = (repo[n] for n in outg)
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repo._updatebranchcache(newmap, ctxgen)
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else:
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# 1-4b. old servers: Check for new topological heads.
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# Construct {old,new}map with branch = None (topological branch).
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# (code based on _updatebranchcache)
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oldheads = set(h for h in remoteheads if h in cl.nodemap)
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newheads = oldheads.union(outg)
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if len(newheads) > 1:
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for latest in reversed(outg):
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if latest not in newheads:
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continue
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minhrev = min(cl.rev(h) for h in newheads)
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reachable = cl.reachable(latest, cl.node(minhrev))
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reachable.remove(latest)
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newheads.difference_update(reachable)
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branches = set([None])
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newmap = {None: newheads}
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oldmap = {None: oldheads}
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unsynced = inc and branches or set()
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# 5. Check for new heads.
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# If there are more heads after the push than before, a suitable
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# error message, depending on unsynced status, is displayed.
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error = None
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for branch in branches:
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newhs = set(newmap[branch])
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oldhs = set(oldmap[branch])
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if len(newhs) > len(oldhs):
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dhs = list(newhs - oldhs)
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if error is None:
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if branch not in ('default', None):
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error = _("push creates new remote head %s "
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"on branch '%s'!") % (short(dhs[0]), branch)
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else:
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error = _("push creates new remote head %s!"
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) % short(dhs[0])
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if branch in unsynced:
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hint = _("you should pull and merge or "
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"use push -f to force")
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else:
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hint = _("did you forget to merge? "
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"use push -f to force")
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if branch is not None:
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repo.ui.note("new remote heads on branch '%s'\n" % branch)
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for h in dhs:
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repo.ui.note("new remote head %s\n" % short(h))
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if error:
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raise util.Abort(error, hint=hint)
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# 6. Check for unsynced changes on involved branches.
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if unsynced:
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repo.ui.warn(_("note: unsynced remote changes!\n"))
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if revs is None:
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# use the fast path, no race possible on push
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cg = repo._changegroup(outg, 'push')
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else:
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cg = repo.getbundle('push', heads=revs, common=common)
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return cg, remoteheads
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