|
|
# discovery.py - protocol changeset discovery functions
|
|
|
#
|
|
|
# Copyright 2010 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 node import nullid, short
|
|
|
from i18n import _
|
|
|
import util, error
|
|
|
|
|
|
def findcommonincoming(repo, remote, heads=None, force=False, commononly=False):
|
|
|
"""Return a tuple (common, missing, heads) used to identify missing nodes
|
|
|
from remote. "missing" is either a boolean indicating if any nodes are missing
|
|
|
(when commononly=True), or else a list of the root nodes of the missing set.
|
|
|
|
|
|
If a list of heads is specified, return only nodes which are heads
|
|
|
or ancestors of these heads.
|
|
|
"""
|
|
|
m = repo.changelog.nodemap
|
|
|
search = []
|
|
|
fetch = set()
|
|
|
seen = set()
|
|
|
seenbranch = set()
|
|
|
base = set()
|
|
|
|
|
|
if not heads:
|
|
|
heads = remote.heads()
|
|
|
|
|
|
if repo.changelog.tip() == nullid:
|
|
|
base.add(nullid)
|
|
|
if heads != [nullid]:
|
|
|
return [nullid], [nullid], list(heads)
|
|
|
return [nullid], [], []
|
|
|
|
|
|
# assume we're closer to the tip than the root
|
|
|
# and start by examining the heads
|
|
|
repo.ui.status(_("searching for changes\n"))
|
|
|
|
|
|
if commononly:
|
|
|
myheads = repo.heads()
|
|
|
known = remote.known(myheads)
|
|
|
if util.all(known):
|
|
|
hasincoming = set(heads).difference(set(myheads)) and True
|
|
|
return myheads, hasincoming, heads
|
|
|
|
|
|
unknown = []
|
|
|
for h in heads:
|
|
|
if h not in m:
|
|
|
unknown.append(h)
|
|
|
else:
|
|
|
base.add(h)
|
|
|
|
|
|
heads = unknown
|
|
|
if not unknown:
|
|
|
return list(base), [], []
|
|
|
|
|
|
req = set(unknown)
|
|
|
reqcnt = 0
|
|
|
|
|
|
# search through remote branches
|
|
|
# a 'branch' here is a linear segment of history, with four parts:
|
|
|
# head, root, first parent, second parent
|
|
|
# (a branch always has two parents (or none) by definition)
|
|
|
unknown = remote.branches(unknown)
|
|
|
while unknown:
|
|
|
r = []
|
|
|
while unknown:
|
|
|
n = unknown.pop(0)
|
|
|
if n[0] in seen:
|
|
|
continue
|
|
|
|
|
|
repo.ui.debug("examining %s:%s\n"
|
|
|
% (short(n[0]), short(n[1])))
|
|
|
if n[0] == nullid: # found the end of the branch
|
|
|
pass
|
|
|
elif n in seenbranch:
|
|
|
repo.ui.debug("branch already found\n")
|
|
|
continue
|
|
|
elif n[1] and n[1] in m: # do we know the base?
|
|
|
repo.ui.debug("found incomplete branch %s:%s\n"
|
|
|
% (short(n[0]), short(n[1])))
|
|
|
search.append(n[0:2]) # schedule branch range for scanning
|
|
|
seenbranch.add(n)
|
|
|
else:
|
|
|
if n[1] not in seen and n[1] not in fetch:
|
|
|
if n[2] in m and n[3] in m:
|
|
|
repo.ui.debug("found new changeset %s\n" %
|
|
|
short(n[1]))
|
|
|
fetch.add(n[1]) # earliest unknown
|
|
|
for p in n[2:4]:
|
|
|
if p in m:
|
|
|
base.add(p) # latest known
|
|
|
|
|
|
for p in n[2:4]:
|
|
|
if p not in req and p not in m:
|
|
|
r.append(p)
|
|
|
req.add(p)
|
|
|
seen.add(n[0])
|
|
|
|
|
|
if r:
|
|
|
reqcnt += 1
|
|
|
repo.ui.progress(_('searching'), reqcnt, unit=_('queries'))
|
|
|
repo.ui.debug("request %d: %s\n" %
|
|
|
(reqcnt, " ".join(map(short, r))))
|
|
|
for p in xrange(0, len(r), 10):
|
|
|
for b in remote.branches(r[p:p + 10]):
|
|
|
repo.ui.debug("received %s:%s\n" %
|
|
|
(short(b[0]), short(b[1])))
|
|
|
unknown.append(b)
|
|
|
|
|
|
# do binary search on the branches we found
|
|
|
while search:
|
|
|
newsearch = []
|
|
|
reqcnt += 1
|
|
|
repo.ui.progress(_('searching'), reqcnt, unit=_('queries'))
|
|
|
for n, l in zip(search, remote.between(search)):
|
|
|
l.append(n[1])
|
|
|
p = n[0]
|
|
|
f = 1
|
|
|
for i in l:
|
|
|
repo.ui.debug("narrowing %d:%d %s\n" % (f, len(l), short(i)))
|
|
|
if i in m:
|
|
|
if f <= 2:
|
|
|
repo.ui.debug("found new branch changeset %s\n" %
|
|
|
short(p))
|
|
|
fetch.add(p)
|
|
|
base.add(i)
|
|
|
else:
|
|
|
repo.ui.debug("narrowed branch search to %s:%s\n"
|
|
|
% (short(p), short(i)))
|
|
|
newsearch.append((p, i))
|
|
|
break
|
|
|
p, f = i, f * 2
|
|
|
search = newsearch
|
|
|
|
|
|
# sanity check our fetch list
|
|
|
for f in fetch:
|
|
|
if f in m:
|
|
|
raise error.RepoError(_("already have changeset ")
|
|
|
+ short(f[:4]))
|
|
|
|
|
|
base = list(base)
|
|
|
if base == [nullid]:
|
|
|
if force:
|
|
|
repo.ui.warn(_("warning: repository is unrelated\n"))
|
|
|
else:
|
|
|
raise util.Abort(_("repository is unrelated"))
|
|
|
|
|
|
repo.ui.debug("found new changesets starting at " +
|
|
|
" ".join([short(f) for f in fetch]) + "\n")
|
|
|
|
|
|
repo.ui.progress(_('searching'), None)
|
|
|
repo.ui.debug("%d total queries\n" % reqcnt)
|
|
|
|
|
|
return base, list(fetch), heads
|
|
|
|
|
|
def findoutgoing(repo, remote, base=None, remoteheads=None, force=False):
|
|
|
"""Return list of nodes that are roots of subsets not in remote
|
|
|
|
|
|
If base dict is specified, assume that these nodes and their parents
|
|
|
exist on the remote side.
|
|
|
If remotehead is specified, assume it is the list of the heads from
|
|
|
the remote repository.
|
|
|
"""
|
|
|
if base is None:
|
|
|
base = findcommonincoming(repo, remote, heads=remoteheads,
|
|
|
force=force)[0]
|
|
|
else:
|
|
|
base = list(base)
|
|
|
|
|
|
repo.ui.debug("common changesets up to "
|
|
|
+ " ".join(map(short, base)) + "\n")
|
|
|
|
|
|
remain = set(repo.changelog.nodemap)
|
|
|
|
|
|
# prune everything remote has from the tree
|
|
|
remain.remove(nullid)
|
|
|
remove = base
|
|
|
while remove:
|
|
|
n = remove.pop(0)
|
|
|
if n in remain:
|
|
|
remain.remove(n)
|
|
|
for p in repo.changelog.parents(n):
|
|
|
remove.append(p)
|
|
|
|
|
|
# find every node whose parents have been pruned
|
|
|
subset = []
|
|
|
# find every remote head that will get new children
|
|
|
for n in remain:
|
|
|
p1, p2 = repo.changelog.parents(n)
|
|
|
if p1 not in remain and p2 not in remain:
|
|
|
subset.append(n)
|
|
|
|
|
|
return subset
|
|
|
|
|
|
def prepush(repo, remote, force, revs, newbranch):
|
|
|
'''Analyze the local and remote repositories and determine which
|
|
|
changesets need to be pushed to the remote. Return value depends
|
|
|
on circumstances:
|
|
|
|
|
|
If we are not going to push anything, return a tuple (None,
|
|
|
outgoing) where outgoing is 0 if there are no outgoing
|
|
|
changesets and 1 if there are, but we refuse to push them
|
|
|
(e.g. would create new remote heads).
|
|
|
|
|
|
Otherwise, return a tuple (changegroup, remoteheads), where
|
|
|
changegroup is a readable file-like object whose read() returns
|
|
|
successive changegroup chunks ready to be sent over the wire and
|
|
|
remoteheads is the list of remote heads.'''
|
|
|
remoteheads = remote.heads()
|
|
|
common, inc, rheads = findcommonincoming(repo, remote, heads=remoteheads,
|
|
|
force=force)
|
|
|
|
|
|
cl = repo.changelog
|
|
|
update = findoutgoing(repo, remote, common, remoteheads)
|
|
|
outg, bases, heads = cl.nodesbetween(update, revs)
|
|
|
|
|
|
if not bases:
|
|
|
repo.ui.status(_("no changes found\n"))
|
|
|
return None, 1
|
|
|
|
|
|
if not force and remoteheads != [nullid]:
|
|
|
if remote.capable('branchmap'):
|
|
|
# Check for each named branch if we're creating new remote heads.
|
|
|
# To be a remote head after push, node must be either:
|
|
|
# - unknown locally
|
|
|
# - a local outgoing head descended from update
|
|
|
# - a remote head that's known locally and not
|
|
|
# ancestral to an outgoing head
|
|
|
|
|
|
# 1. Create set of branches involved in the push.
|
|
|
branches = set(repo[n].branch() for n in outg)
|
|
|
|
|
|
# 2. Check for new branches on the remote.
|
|
|
remotemap = remote.branchmap()
|
|
|
newbranches = branches - set(remotemap)
|
|
|
if newbranches and not newbranch: # new branch requires --new-branch
|
|
|
branchnames = ', '.join(sorted(newbranches))
|
|
|
raise util.Abort(_("push creates new remote branches: %s!")
|
|
|
% branchnames,
|
|
|
hint=_("use 'hg push --new-branch' to create"
|
|
|
" new remote branches"))
|
|
|
branches.difference_update(newbranches)
|
|
|
|
|
|
# 3. Construct the initial oldmap and newmap dicts.
|
|
|
# They contain information about the remote heads before and
|
|
|
# after the push, respectively.
|
|
|
# Heads not found locally are not included in either dict,
|
|
|
# since they won't be affected by the push.
|
|
|
# unsynced contains all branches with incoming changesets.
|
|
|
oldmap = {}
|
|
|
newmap = {}
|
|
|
unsynced = set()
|
|
|
for branch in branches:
|
|
|
remotebrheads = remotemap[branch]
|
|
|
prunedbrheads = [h for h in remotebrheads if h in cl.nodemap]
|
|
|
oldmap[branch] = prunedbrheads
|
|
|
newmap[branch] = list(prunedbrheads)
|
|
|
if len(remotebrheads) > len(prunedbrheads):
|
|
|
unsynced.add(branch)
|
|
|
|
|
|
# 4. Update newmap with outgoing changes.
|
|
|
# This will possibly add new heads and remove existing ones.
|
|
|
ctxgen = (repo[n] for n in outg)
|
|
|
repo._updatebranchcache(newmap, ctxgen)
|
|
|
|
|
|
else:
|
|
|
# 1-4b. old servers: Check for new topological heads.
|
|
|
# Construct {old,new}map with branch = None (topological branch).
|
|
|
# (code based on _updatebranchcache)
|
|
|
oldheads = set(h for h in remoteheads if h in cl.nodemap)
|
|
|
newheads = oldheads.union(outg)
|
|
|
if len(newheads) > 1:
|
|
|
for latest in reversed(outg):
|
|
|
if latest not in newheads:
|
|
|
continue
|
|
|
minhrev = min(cl.rev(h) for h in newheads)
|
|
|
reachable = cl.reachable(latest, cl.node(minhrev))
|
|
|
reachable.remove(latest)
|
|
|
newheads.difference_update(reachable)
|
|
|
branches = set([None])
|
|
|
newmap = {None: newheads}
|
|
|
oldmap = {None: oldheads}
|
|
|
unsynced = inc and branches or set()
|
|
|
|
|
|
# 5. Check for new heads.
|
|
|
# If there are more heads after the push than before, a suitable
|
|
|
# error message, depending on unsynced status, is displayed.
|
|
|
error = None
|
|
|
for branch in branches:
|
|
|
newhs = set(newmap[branch])
|
|
|
oldhs = set(oldmap[branch])
|
|
|
if len(newhs) > len(oldhs):
|
|
|
if error is None:
|
|
|
if branch:
|
|
|
error = _("push creates new remote heads "
|
|
|
"on branch '%s'!") % branch
|
|
|
else:
|
|
|
error = _("push creates new remote heads!")
|
|
|
if branch in unsynced:
|
|
|
hint = _("you should pull and merge or "
|
|
|
"use push -f to force")
|
|
|
else:
|
|
|
hint = _("did you forget to merge? "
|
|
|
"use push -f to force")
|
|
|
if branch:
|
|
|
repo.ui.debug("new remote heads on branch '%s'\n" % branch)
|
|
|
for h in (newhs - oldhs):
|
|
|
repo.ui.debug("new remote head %s\n" % short(h))
|
|
|
if error:
|
|
|
raise util.Abort(error, hint=hint)
|
|
|
|
|
|
# 6. Check for unsynced changes on involved branches.
|
|
|
if unsynced:
|
|
|
repo.ui.warn(_("note: unsynced remote changes!\n"))
|
|
|
|
|
|
if revs is None:
|
|
|
# use the fast path, no race possible on push
|
|
|
nodes = repo.changelog.findmissing(common)
|
|
|
cg = repo._changegroup(nodes, 'push')
|
|
|
else:
|
|
|
cg = repo.changegroupsubset(update, revs, 'push')
|
|
|
return cg, remoteheads
|
|
|
|
