posix: delete Python 2 posixfile()
The comment no longer makes sense since the stdlib open() behaves
the way we want on Python 3. So it was removed.
Differential Revision: https://phab.mercurial-scm.org/D12288
# discovery.py - protocol changeset discovery functions
#
# Copyright 2010 Olivia Mackall <olivia@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.
import functools
from .i18n import _
from .node import (
hex,
short,
)
from . import (
bookmarks,
branchmap,
error,
obsolete,
phases,
pycompat,
scmutil,
setdiscovery,
treediscovery,
util,
)
def findcommonincoming(repo, remote, heads=None, force=False, ancestorsof=None):
"""Return a tuple (common, anyincoming, heads) used to identify the common
subset of nodes between repo and remote.
"common" is a list of (at least) the heads of the common subset.
"anyincoming" is testable as a boolean indicating if any nodes are missing
locally. If remote does not support getbundle, this actually is a list of
roots of the nodes that would be incoming, to be supplied to
changegroupsubset. No code except for pull should be relying on this fact
any longer.
"heads" is either the supplied heads, or else the remote's heads.
"ancestorsof" if not None, restrict the discovery to a subset defined by
these nodes. Changeset outside of this set won't be considered (but may
still appear in "common").
If you pass heads and they are all known locally, the response lists just
these heads in "common" and in "heads".
Please use findcommonoutgoing to compute the set of outgoing nodes to give
extensions a good hook into outgoing.
"""
if not remote.capable(b'getbundle'):
return treediscovery.findcommonincoming(repo, remote, heads, force)
if heads:
knownnode = repo.changelog.hasnode # no nodemap until it is filtered
if all(knownnode(h) for h in heads):
return (heads, False, heads)
res = setdiscovery.findcommonheads(
repo.ui,
repo,
remote,
abortwhenunrelated=not force,
ancestorsof=ancestorsof,
)
common, anyinc, srvheads = res
if heads and not anyinc:
# server could be lying on the advertised heads
has_node = repo.changelog.hasnode
anyinc = any(not has_node(n) for n in heads)
return (list(common), anyinc, heads or list(srvheads))
class outgoing(object):
"""Represents the result of a findcommonoutgoing() call.
Members:
ancestorsof is a list of the nodes whose ancestors are included in the
outgoing operation.
missing is a list of those ancestors of ancestorsof that are present in
local but not in remote.
common is a set containing revs common between the local and the remote
repository (at least all of those that are ancestors of ancestorsof).
commonheads is the list of heads of common.
excluded is the list of missing changeset that shouldn't be sent
remotely.
Some members are computed on demand from the heads, unless provided upfront
by discovery."""
def __init__(
self, repo, commonheads=None, ancestorsof=None, missingroots=None
):
# at least one of them must not be set
assert None in (commonheads, missingroots)
cl = repo.changelog
if ancestorsof is None:
ancestorsof = cl.heads()
if missingroots:
discbases = []
for n in missingroots:
discbases.extend([p for p in cl.parents(n) if p != repo.nullid])
# TODO remove call to nodesbetween.
# TODO populate attributes on outgoing instance instead of setting
# discbases.
csets, roots, heads = cl.nodesbetween(missingroots, ancestorsof)
included = set(csets)
ancestorsof = heads
commonheads = [n for n in discbases if n not in included]
elif not commonheads:
commonheads = [repo.nullid]
self.commonheads = commonheads
self.ancestorsof = ancestorsof
self._revlog = cl
self._common = None
self._missing = None
self.excluded = []
def _computecommonmissing(self):
sets = self._revlog.findcommonmissing(
self.commonheads, self.ancestorsof
)
self._common, self._missing = sets
@util.propertycache
def common(self):
if self._common is None:
self._computecommonmissing()
return self._common
@util.propertycache
def missing(self):
if self._missing is None:
self._computecommonmissing()
return self._missing
def findcommonoutgoing(
repo, other, onlyheads=None, force=False, commoninc=None, portable=False
):
"""Return an outgoing instance to identify the nodes present in repo but
not in other.
If onlyheads is given, only nodes ancestral to nodes in onlyheads
(inclusive) are included. If you already know the local repo's heads,
passing them in onlyheads is faster than letting them be recomputed here.
If commoninc is given, it must be the result of a prior call to
findcommonincoming(repo, other, force) to avoid recomputing it here.
If portable is given, compute more conservative common and ancestorsof,
to make bundles created from the instance more portable."""
# declare an empty outgoing object to be filled later
og = outgoing(repo, None, None)
# get common set if not provided
if commoninc is None:
commoninc = findcommonincoming(
repo, other, force=force, ancestorsof=onlyheads
)
og.commonheads, _any, _hds = commoninc
# compute outgoing
mayexclude = repo._phasecache.phaseroots[phases.secret] or repo.obsstore
if not mayexclude:
og.ancestorsof = onlyheads or repo.heads()
elif onlyheads is None:
# use visible heads as it should be cached
og.ancestorsof = repo.filtered(b"served").heads()
og.excluded = [ctx.node() for ctx in repo.set(b'secret() or extinct()')]
else:
# compute common, missing and exclude secret stuff
sets = repo.changelog.findcommonmissing(og.commonheads, onlyheads)
og._common, allmissing = sets
og._missing = missing = []
og.excluded = excluded = []
for node in allmissing:
ctx = repo[node]
if ctx.phase() >= phases.secret or ctx.extinct():
excluded.append(node)
else:
missing.append(node)
if len(missing) == len(allmissing):
ancestorsof = onlyheads
else: # update missing heads
ancestorsof = phases.newheads(repo, onlyheads, excluded)
og.ancestorsof = ancestorsof
if portable:
# recompute common and ancestorsof as if -r<rev> had been given for
# each head of missing, and --base <rev> for each head of the proper
# ancestors of missing
og._computecommonmissing()
cl = repo.changelog
missingrevs = {cl.rev(n) for n in og._missing}
og._common = set(cl.ancestors(missingrevs)) - missingrevs
commonheads = set(og.commonheads)
og.ancestorsof = [h for h in og.ancestorsof if h not in commonheads]
return og
def _headssummary(pushop):
"""compute a summary of branch and heads status before and after push
return {'branch': ([remoteheads], [newheads],
[unsyncedheads], [discardedheads])} mapping
- branch: the branch name,
- remoteheads: the list of remote heads known locally
None if the branch is new,
- newheads: the new remote heads (known locally) with outgoing pushed,
- unsyncedheads: the list of remote heads unknown locally,
- discardedheads: the list of heads made obsolete by the push.
"""
repo = pushop.repo.unfiltered()
remote = pushop.remote
outgoing = pushop.outgoing
cl = repo.changelog
headssum = {}
missingctx = set()
# A. Create set of branches involved in the push.
branches = set()
for n in outgoing.missing:
ctx = repo[n]
missingctx.add(ctx)
branches.add(ctx.branch())
with remote.commandexecutor() as e:
remotemap = e.callcommand(b'branchmap', {}).result()
knownnode = cl.hasnode # do not use nodemap until it is filtered
# A. register remote heads of branches which are in outgoing set
for branch, heads in pycompat.iteritems(remotemap):
# don't add head info about branches which we don't have locally
if branch not in branches:
continue
known = []
unsynced = []
for h in heads:
if knownnode(h):
known.append(h)
else:
unsynced.append(h)
headssum[branch] = (known, list(known), unsynced)
# B. add new branch data
for branch in branches:
if branch not in headssum:
headssum[branch] = (None, [], [])
# C. Update newmap with outgoing changes.
# This will possibly add new heads and remove existing ones.
newmap = branchmap.remotebranchcache(
repo,
(
(branch, heads[1])
for branch, heads in pycompat.iteritems(headssum)
if heads[0] is not None
),
)
newmap.update(repo, (ctx.rev() for ctx in missingctx))
for branch, newheads in pycompat.iteritems(newmap):
headssum[branch][1][:] = newheads
for branch, items in pycompat.iteritems(headssum):
for l in items:
if l is not None:
l.sort()
headssum[branch] = items + ([],)
# If there are no obsstore, no post processing are needed.
if repo.obsstore:
torev = repo.changelog.rev
futureheads = {torev(h) for h in outgoing.ancestorsof}
futureheads |= {torev(h) for h in outgoing.commonheads}
allfuturecommon = repo.changelog.ancestors(futureheads, inclusive=True)
for branch, heads in sorted(pycompat.iteritems(headssum)):
remoteheads, newheads, unsyncedheads, placeholder = heads
result = _postprocessobsolete(pushop, allfuturecommon, newheads)
headssum[branch] = (
remoteheads,
sorted(result[0]),
unsyncedheads,
sorted(result[1]),
)
return headssum
def _oldheadssummary(repo, remoteheads, outgoing, inc=False):
"""Compute branchmapsummary for repo without branchmap support"""
# 1-4b. old servers: Check for new topological heads.
# Construct {old,new}map with branch = None (topological branch).
# (code based on update)
knownnode = repo.changelog.hasnode # no nodemap until it is filtered
oldheads = sorted(h for h in remoteheads if knownnode(h))
# all nodes in outgoing.missing are children of either:
# - an element of oldheads
# - another element of outgoing.missing
# - nullrev
# This explains why the new head are very simple to compute.
r = repo.set(b'heads(%ln + %ln)', oldheads, outgoing.missing)
newheads = sorted(c.node() for c in r)
# set some unsynced head to issue the "unsynced changes" warning
if inc:
unsynced = [None]
else:
unsynced = []
return {None: (oldheads, newheads, unsynced, [])}
def _nowarnheads(pushop):
# Compute newly pushed bookmarks. We don't warn about bookmarked heads.
repo = pushop.repo.unfiltered()
remote = pushop.remote
localbookmarks = repo._bookmarks
with remote.commandexecutor() as e:
remotebookmarks = e.callcommand(
b'listkeys',
{
b'namespace': b'bookmarks',
},
).result()
bookmarkedheads = set()
# internal config: bookmarks.pushing
newbookmarks = [
localbookmarks.expandname(b)
for b in pushop.ui.configlist(b'bookmarks', b'pushing')
]
for bm in localbookmarks:
rnode = remotebookmarks.get(bm)
if rnode and rnode in repo:
lctx, rctx = repo[localbookmarks[bm]], repo[rnode]
if bookmarks.validdest(repo, rctx, lctx):
bookmarkedheads.add(lctx.node())
else:
if bm in newbookmarks and bm not in remotebookmarks:
bookmarkedheads.add(localbookmarks[bm])
return bookmarkedheads
def checkheads(pushop):
"""Check that a push won't add any outgoing head
raise StateError error and display ui message as needed.
"""
repo = pushop.repo.unfiltered()
remote = pushop.remote
outgoing = pushop.outgoing
remoteheads = pushop.remoteheads
newbranch = pushop.newbranch
inc = bool(pushop.incoming)
# 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
if remoteheads == [repo.nullid]:
# remote is empty, nothing to check.
return
if remote.capable(b'branchmap'):
headssum = _headssummary(pushop)
else:
headssum = _oldheadssummary(repo, remoteheads, outgoing, inc)
pushop.pushbranchmap = headssum
newbranches = [
branch
for branch, heads in pycompat.iteritems(headssum)
if heads[0] is None
]
# 1. Check for new branches on the remote.
if newbranches and not newbranch: # new branch requires --new-branch
branchnames = b', '.join(sorted(newbranches))
# Calculate how many of the new branches are closed branches
closedbranches = set()
for tag, heads, tip, isclosed in repo.branchmap().iterbranches():
if isclosed:
closedbranches.add(tag)
closedbranches = closedbranches & set(newbranches)
if closedbranches:
errmsg = _(b"push creates new remote branches: %s (%d closed)") % (
branchnames,
len(closedbranches),
)
else:
errmsg = _(b"push creates new remote branches: %s") % branchnames
hint = _(b"use 'hg push --new-branch' to create new remote branches")
raise error.StateError(errmsg, hint=hint)
# 2. Find heads that we need not warn about
nowarnheads = _nowarnheads(pushop)
# 3. Check for new heads.
# If there are more heads after the push than before, a suitable
# error message, depending on unsynced status, is displayed.
errormsg = None
for branch, heads in sorted(pycompat.iteritems(headssum)):
remoteheads, newheads, unsyncedheads, discardedheads = heads
# add unsynced data
if remoteheads is None:
oldhs = set()
else:
oldhs = set(remoteheads)
oldhs.update(unsyncedheads)
dhs = None # delta heads, the new heads on branch
newhs = set(newheads)
newhs.update(unsyncedheads)
if unsyncedheads:
if None in unsyncedheads:
# old remote, no heads data
heads = None
else:
heads = scmutil.nodesummaries(repo, unsyncedheads)
if heads is None:
repo.ui.status(
_(b"remote has heads that are not known locally\n")
)
elif branch is None:
repo.ui.status(
_(b"remote has heads that are not known locally: %s\n")
% heads
)
else:
repo.ui.status(
_(
b"remote has heads on branch '%s' that are "
b"not known locally: %s\n"
)
% (branch, heads)
)
if remoteheads is None:
if len(newhs) > 1:
dhs = list(newhs)
if errormsg is None:
errormsg = (
_(b"push creates new branch '%s' with multiple heads")
% branch
)
hint = _(
b"merge or"
b" see 'hg help push' for details about"
b" pushing new heads"
)
elif len(newhs) > len(oldhs):
# remove bookmarked or existing remote heads from the new heads list
dhs = sorted(newhs - nowarnheads - oldhs)
if dhs:
if errormsg is None:
if branch not in (b'default', None):
errormsg = _(
b"push creates new remote head %s on branch '%s'"
) % (
short(dhs[0]),
branch,
)
elif repo[dhs[0]].bookmarks():
errormsg = _(
b"push creates new remote head %s "
b"with bookmark '%s'"
) % (short(dhs[0]), repo[dhs[0]].bookmarks()[0])
else:
errormsg = _(b"push creates new remote head %s") % short(
dhs[0]
)
if unsyncedheads:
hint = _(
b"pull and merge or"
b" see 'hg help push' for details about"
b" pushing new heads"
)
else:
hint = _(
b"merge or"
b" see 'hg help push' for details about"
b" pushing new heads"
)
if branch is None:
repo.ui.note(_(b"new remote heads:\n"))
else:
repo.ui.note(_(b"new remote heads on branch '%s':\n") % branch)
for h in dhs:
repo.ui.note(b" %s\n" % short(h))
if errormsg:
raise error.StateError(errormsg, hint=hint)
def _postprocessobsolete(pushop, futurecommon, candidate_newhs):
"""post process the list of new heads with obsolescence information
Exists as a sub-function to contain the complexity and allow extensions to
experiment with smarter logic.
Returns (newheads, discarded_heads) tuple
"""
# known issue
#
# * We "silently" skip processing on all changeset unknown locally
#
# * if <nh> is public on the remote, it won't be affected by obsolete
# marker and a new is created
# define various utilities and containers
repo = pushop.repo
unfi = repo.unfiltered()
torev = unfi.changelog.index.get_rev
public = phases.public
getphase = unfi._phasecache.phase
ispublic = lambda r: getphase(unfi, r) == public
ispushed = lambda n: torev(n) in futurecommon
hasoutmarker = functools.partial(pushingmarkerfor, unfi.obsstore, ispushed)
successorsmarkers = unfi.obsstore.successors
newhs = set() # final set of new heads
discarded = set() # new head of fully replaced branch
localcandidate = set() # candidate heads known locally
unknownheads = set() # candidate heads unknown locally
for h in candidate_newhs:
if h in unfi:
localcandidate.add(h)
else:
if successorsmarkers.get(h) is not None:
msg = (
b'checkheads: remote head unknown locally has'
b' local marker: %s\n'
)
repo.ui.debug(msg % hex(h))
unknownheads.add(h)
# fast path the simple case
if len(localcandidate) == 1:
return unknownheads | set(candidate_newhs), set()
obsrevs = obsolete.getrevs(unfi, b'obsolete')
futurenonobsolete = frozenset(futurecommon) - obsrevs
# actually process branch replacement
while localcandidate:
nh = localcandidate.pop()
r = torev(nh)
current_branch = unfi[nh].branch()
# run this check early to skip the evaluation of the whole branch
if ispublic(r) or r not in obsrevs:
newhs.add(nh)
continue
# Get all revs/nodes on the branch exclusive to this head
# (already filtered heads are "ignored"))
branchrevs = unfi.revs(
b'only(%n, (%ln+%ln))', nh, localcandidate, newhs
)
branchnodes = []
for r in branchrevs:
c = unfi[r]
if c.branch() == current_branch:
branchnodes.append(c.node())
# The branch won't be hidden on the remote if
# * any part of it is public,
# * any part of it is considered part of the result by previous logic,
# * if we have no markers to push to obsolete it.
if (
any(ispublic(r) for r in branchrevs)
or any(torev(n) in futurenonobsolete for n in branchnodes)
or any(not hasoutmarker(n) for n in branchnodes)
):
newhs.add(nh)
else:
# note: there is a corner case if there is a merge in the branch.
# we might end up with -more- heads. However, these heads are not
# "added" by the push, but more by the "removal" on the remote so I
# think is a okay to ignore them,
discarded.add(nh)
newhs |= unknownheads
return newhs, discarded
def pushingmarkerfor(obsstore, ispushed, node):
"""true if some markers are to be pushed for node
We cannot just look in to the pushed obsmarkers from the pushop because
discovery might have filtered relevant markers. In addition listing all
markers relevant to all changesets in the pushed set would be too expensive
(O(len(repo)))
(note: There are cache opportunity in this function. but it would requires
a two dimensional stack.)
"""
successorsmarkers = obsstore.successors
stack = [node]
seen = set(stack)
while stack:
current = stack.pop()
if ispushed(current):
return True
markers = successorsmarkers.get(current, ())
# markers fields = ('prec', 'succs', 'flag', 'meta', 'date', 'parents')
for m in markers:
nexts = m[1] # successors
if not nexts: # this is a prune marker
nexts = m[5] or () # parents
for n in nexts:
if n not in seen:
seen.add(n)
stack.append(n)
return False