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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, error
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def findcommonincoming(repo, remote, heads=None, force=False):
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"""Return a tuple (common, missing roots, heads) used to identify
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missing nodes from remote.
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If a list of heads is specified, return only nodes which are heads
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or ancestors of these heads.
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"""
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m = repo.changelog.nodemap
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search = []
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fetch = set()
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seen = set()
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seenbranch = set()
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base = set()
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if not heads:
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heads = remote.heads()
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if repo.changelog.tip() == nullid:
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base.add(nullid)
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if heads != [nullid]:
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return [nullid], [nullid], list(heads)
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return [nullid], [], []
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# assume we're closer to the tip than the root
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# and start by examining the heads
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repo.ui.status(_("searching for changes\n"))
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unknown = []
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for h in heads:
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if h not in m:
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unknown.append(h)
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else:
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base.add(h)
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heads = unknown
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if not unknown:
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return list(base), [], []
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req = set(unknown)
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reqcnt = 0
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# search through remote branches
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# a 'branch' here is a linear segment of history, with four parts:
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# head, root, first parent, second parent
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# (a branch always has two parents (or none) by definition)
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unknown = remote.branches(unknown)
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while unknown:
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r = []
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while unknown:
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n = unknown.pop(0)
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if n[0] in seen:
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continue
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repo.ui.debug("examining %s:%s\n"
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% (short(n[0]), short(n[1])))
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if n[0] == nullid: # found the end of the branch
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pass
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elif n in seenbranch:
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repo.ui.debug("branch already found\n")
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continue
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elif n[1] and n[1] in m: # do we know the base?
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repo.ui.debug("found incomplete branch %s:%s\n"
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% (short(n[0]), short(n[1])))
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search.append(n[0:2]) # schedule branch range for scanning
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seenbranch.add(n)
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else:
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if n[1] not in seen and n[1] not in fetch:
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if n[2] in m and n[3] in m:
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repo.ui.debug("found new changeset %s\n" %
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short(n[1]))
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fetch.add(n[1]) # earliest unknown
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for p in n[2:4]:
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if p in m:
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base.add(p) # latest known
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for p in n[2:4]:
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if p not in req and p not in m:
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r.append(p)
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req.add(p)
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seen.add(n[0])
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if r:
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reqcnt += 1
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repo.ui.progress(_('searching'), reqcnt, unit=_('queries'))
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repo.ui.debug("request %d: %s\n" %
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(reqcnt, " ".join(map(short, r))))
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for p in xrange(0, len(r), 10):
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for b in remote.branches(r[p:p + 10]):
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repo.ui.debug("received %s:%s\n" %
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(short(b[0]), short(b[1])))
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unknown.append(b)
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# do binary search on the branches we found
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while search:
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newsearch = []
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reqcnt += 1
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repo.ui.progress(_('searching'), reqcnt, unit=_('queries'))
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for n, l in zip(search, remote.between(search)):
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l.append(n[1])
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p = n[0]
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f = 1
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for i in l:
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repo.ui.debug("narrowing %d:%d %s\n" % (f, len(l), short(i)))
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if i in m:
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if f <= 2:
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repo.ui.debug("found new branch changeset %s\n" %
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short(p))
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fetch.add(p)
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base.add(i)
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else:
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repo.ui.debug("narrowed branch search to %s:%s\n"
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% (short(p), short(i)))
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newsearch.append((p, i))
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break
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p, f = i, f * 2
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search = newsearch
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# sanity check our fetch list
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for f in fetch:
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if f in m:
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raise error.RepoError(_("already have changeset ")
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+ short(f[:4]))
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base = list(base)
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if base == [nullid]:
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if force:
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repo.ui.warn(_("warning: repository is unrelated\n"))
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else:
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raise util.Abort(_("repository is unrelated"))
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repo.ui.debug("found new changesets starting at " +
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" ".join([short(f) for f in fetch]) + "\n")
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repo.ui.progress(_('searching'), None)
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repo.ui.debug("%d total queries\n" % reqcnt)
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return base, list(fetch), heads
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def findoutgoing(repo, remote, base=None, remoteheads=None, force=False):
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"""Return list of nodes that are roots of subsets not in remote
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If base dict is specified, assume that these nodes and their parents
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exist on the remote side.
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If remotehead is specified, assume it is the list of the heads from
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the remote repository.
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"""
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if base is None:
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base = findcommonincoming(repo, remote, heads=remoteheads,
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force=force)[0]
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else:
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base = list(base)
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repo.ui.debug("common changesets up to "
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+ " ".join(map(short, base)) + "\n")
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remain = set(repo.changelog.nodemap)
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# prune everything remote has from the tree
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remain.remove(nullid)
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remove = base
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while remove:
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n = remove.pop(0)
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if n in remain:
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remain.remove(n)
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for p in repo.changelog.parents(n):
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remove.append(p)
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# find every node whose parents have been pruned
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subset = []
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# find every remote head that will get new children
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for n in remain:
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p1, p2 = repo.changelog.parents(n)
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if p1 not in remain and p2 not in remain:
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subset.append(n)
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return subset
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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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remoteheads = remote.heads()
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common, inc, rheads = findcommonincoming(repo, remote, heads=remoteheads,
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force=force)
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cl = repo.changelog
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update = findoutgoing(repo, remote, common, remoteheads)
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outg, bases, heads = cl.nodesbetween(update, revs)
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if not bases:
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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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#
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# New named branches cannot be created without --force.
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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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# warning, depending on unsynced status, is displayed.
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for branch in branches:
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if len(newmap[branch]) > len(oldmap[branch]):
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if branch:
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msg = _("push creates new remote heads "
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"on branch '%s'!") % branch
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else:
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msg = _("push creates new remote heads!")
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if branch in unsynced:
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hint = _("you should pull and merge or use push -f to force")
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else:
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hint = _("did you forget to merge? use push -f to force")
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raise util.Abort(msg, 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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nodes = repo.changelog.findmissing(common)
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cg = repo._changegroup(nodes, 'push')
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else:
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cg = repo.changegroupsubset(update, revs, 'push')
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return cg, remoteheads
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