unbundle: free temporary objects after use
This reduces peak RSS for larger unbundle operations by ~30 Bytes per
changeset on AMD64. This can't be a direct delete for Python 2.7, so
reset the object instead and leave a comment.
The efilesset object can't be deleted as it is referenced by the local
onchangelog function and Python 2.7 rejects a delete on the existance of
a nested scope.
Differential Revision: https://phab.mercurial-scm.org/D9153
# destutil.py - Mercurial utility function for command destination
#
# Copyright Matt Mackall <mpm@selenic.com> and other
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import
from .i18n import _
from . import bookmarks, error, obsutil, scmutil, stack
def orphanpossibledestination(repo, rev):
"""Return all changesets that may be a new parent for orphan `rev`.
This function works fine on non-orphan revisions, it's just silly
because there's no destination implied by obsolete markers, so
it'll return nothing.
"""
tonode = repo.changelog.node
parents = repo.changelog.parentrevs
torev = repo.changelog.rev
dest = set()
tovisit = list(parents(rev))
while tovisit:
r = tovisit.pop()
succsets = obsutil.successorssets(repo, tonode(r))
if not succsets:
# if there are no successors for r, r was probably pruned
# and we should walk up to r's parents to try and find
# some successors.
tovisit.extend(parents(r))
else:
# We should probably pick only one destination from split
# (case where '1 < len(ss)'), This could be the currently
# tipmost, but the correct result is less clear when
# results of the split have been moved such that they
# reside on multiple branches.
for ss in succsets:
for n in ss:
dr = torev(n)
if dr != -1:
dest.add(dr)
return dest
def _destupdateobs(repo, clean):
"""decide of an update destination from obsolescence markers"""
node = None
wc = repo[None]
p1 = wc.p1()
movemark = None
if p1.obsolete() and not p1.children():
# allow updating to successors
successors = obsutil.successorssets(repo, p1.node())
# behavior of certain cases is as follows,
#
# divergent changesets: update to highest rev, similar to what
# is currently done when there are more than one head
# (i.e. 'tip')
#
# replaced changesets: same as divergent except we know there
# is no conflict
#
# pruned changeset: no update is done; though, we could
# consider updating to the first non-obsolete parent,
# similar to what is current done for 'hg prune'
if successors:
# flatten the list here handles both divergent (len > 1)
# and the usual case (len = 1)
successors = [n for sub in successors for n in sub]
# get the max revision for the given successors set,
# i.e. the 'tip' of a set
node = repo.revs(b'max(%ln)', successors).first()
if bookmarks.isactivewdirparent(repo):
movemark = repo[b'.'].node()
return node, movemark, None
def _destupdatebook(repo, clean):
"""decide on an update destination from active bookmark"""
# we also move the active bookmark, if any
node = None
activemark, movemark = bookmarks.calculateupdate(repo.ui, repo)
if activemark is not None:
node = repo._bookmarks[activemark]
return node, movemark, activemark
def _destupdatebranch(repo, clean):
"""decide on an update destination from current branch
This ignores closed branch heads.
"""
wc = repo[None]
movemark = node = None
currentbranch = wc.branch()
if clean:
currentbranch = repo[b'.'].branch()
if currentbranch in repo.branchmap():
heads = repo.branchheads(currentbranch)
if heads:
node = repo.revs(b'max(.::(%ln))', heads).first()
if bookmarks.isactivewdirparent(repo):
movemark = repo[b'.'].node()
elif currentbranch == b'default' and not wc.p1():
# "null" parent belongs to "default" branch, but it doesn't exist, so
# update to the tipmost non-closed branch head
node = repo.revs(b'max(head() and not closed())').first()
else:
node = repo[b'.'].node()
return node, movemark, None
def _destupdatebranchfallback(repo, clean):
"""decide on an update destination from closed heads in current branch"""
wc = repo[None]
currentbranch = wc.branch()
movemark = None
if currentbranch in repo.branchmap():
# here, all descendant branch heads are closed
heads = repo.branchheads(currentbranch, closed=True)
assert heads, b"any branch has at least one head"
node = repo.revs(b'max(.::(%ln))', heads).first()
assert (
node is not None
), b"any revision has at least one descendant branch head"
if bookmarks.isactivewdirparent(repo):
movemark = repo[b'.'].node()
else:
# here, no "default" branch, and all branches are closed
node = repo.lookup(b'tip')
assert node is not None, b"'tip' exists even in empty repository"
return node, movemark, None
# order in which each step should be evaluated
# steps are run until one finds a destination
destupdatesteps = [b'evolution', b'bookmark', b'branch', b'branchfallback']
# mapping to ease extension overriding steps.
destupdatestepmap = {
b'evolution': _destupdateobs,
b'bookmark': _destupdatebook,
b'branch': _destupdatebranch,
b'branchfallback': _destupdatebranchfallback,
}
def destupdate(repo, clean=False):
"""destination for bare update operation
return (rev, movemark, activemark)
- rev: the revision to update to,
- movemark: node to move the active bookmark from
(cf bookmark.calculate update),
- activemark: a bookmark to activate at the end of the update.
"""
node = movemark = activemark = None
for step in destupdatesteps:
node, movemark, activemark = destupdatestepmap[step](repo, clean)
if node is not None:
break
rev = repo[node].rev()
return rev, movemark, activemark
msgdestmerge = {
# too many matching divergent bookmark
b'toomanybookmarks': {
b'merge': (
_(
b"multiple matching bookmarks to merge -"
b" please merge with an explicit rev or bookmark"
),
_(b"run 'hg heads' to see all heads, specify rev with -r"),
),
b'rebase': (
_(
b"multiple matching bookmarks to rebase -"
b" please rebase to an explicit rev or bookmark"
),
_(b"run 'hg heads' to see all heads, specify destination with -d"),
),
},
# no other matching divergent bookmark
b'nootherbookmarks': {
b'merge': (
_(
b"no matching bookmark to merge - "
b"please merge with an explicit rev or bookmark"
),
_(b"run 'hg heads' to see all heads, specify rev with -r"),
),
b'rebase': (
_(
b"no matching bookmark to rebase - "
b"please rebase to an explicit rev or bookmark"
),
_(b"run 'hg heads' to see all heads, specify destination with -d"),
),
},
# branch have too many unbookmarked heads, no obvious destination
b'toomanyheads': {
b'merge': (
_(b"branch '%s' has %d heads - please merge with an explicit rev"),
_(b"run 'hg heads .' to see heads, specify rev with -r"),
),
b'rebase': (
_(b"branch '%s' has %d heads - please rebase to an explicit rev"),
_(b"run 'hg heads .' to see heads, specify destination with -d"),
),
},
# branch have no other unbookmarked heads
b'bookmarkedheads': {
b'merge': (
_(b"heads are bookmarked - please merge with an explicit rev"),
_(b"run 'hg heads' to see all heads, specify rev with -r"),
),
b'rebase': (
_(b"heads are bookmarked - please rebase to an explicit rev"),
_(b"run 'hg heads' to see all heads, specify destination with -d"),
),
},
# branch have just a single heads, but there is other branches
b'nootherbranchheads': {
b'merge': (
_(b"branch '%s' has one head - please merge with an explicit rev"),
_(b"run 'hg heads' to see all heads, specify rev with -r"),
),
b'rebase': (
_(b"branch '%s' has one head - please rebase to an explicit rev"),
_(b"run 'hg heads' to see all heads, specify destination with -d"),
),
},
# repository have a single head
b'nootherheads': {
b'merge': (_(b'nothing to merge'), None),
b'rebase': (_(b'nothing to rebase'), None),
},
# repository have a single head and we are not on it
b'nootherheadsbehind': {
b'merge': (_(b'nothing to merge'), _(b"use 'hg update' instead")),
b'rebase': (_(b'nothing to rebase'), _(b"use 'hg update' instead")),
},
# We are not on a head
b'notatheads': {
b'merge': (
_(b'working directory not at a head revision'),
_(b"use 'hg update' or merge with an explicit revision"),
),
b'rebase': (
_(b'working directory not at a head revision'),
_(b"use 'hg update' or rebase to an explicit revision"),
),
},
b'emptysourceset': {
b'merge': (_(b'source set is empty'), None),
b'rebase': (_(b'source set is empty'), None),
},
b'multiplebranchessourceset': {
b'merge': (_(b'source set is rooted in multiple branches'), None),
b'rebase': (
_(b'rebaseset is rooted in multiple named branches'),
_(b'specify an explicit destination with --dest'),
),
},
}
def _destmergebook(repo, action=b'merge', sourceset=None, destspace=None):
"""find merge destination in the active bookmark case"""
node = None
bmheads = bookmarks.headsforactive(repo)
curhead = repo._bookmarks[repo._activebookmark]
if len(bmheads) == 2:
if curhead == bmheads[0]:
node = bmheads[1]
else:
node = bmheads[0]
elif len(bmheads) > 2:
msg, hint = msgdestmerge[b'toomanybookmarks'][action]
raise error.ManyMergeDestAbort(msg, hint=hint)
elif len(bmheads) <= 1:
msg, hint = msgdestmerge[b'nootherbookmarks'][action]
raise error.NoMergeDestAbort(msg, hint=hint)
assert node is not None
return node
def _destmergebranch(
repo, action=b'merge', sourceset=None, onheadcheck=True, destspace=None
):
"""find merge destination based on branch heads"""
node = None
if sourceset is None:
sourceset = [repo[repo.dirstate.p1()].rev()]
branch = repo.dirstate.branch()
elif not sourceset:
msg, hint = msgdestmerge[b'emptysourceset'][action]
raise error.NoMergeDestAbort(msg, hint=hint)
else:
branch = None
for ctx in repo.set(b'roots(%ld::%ld)', sourceset, sourceset):
if branch is not None and ctx.branch() != branch:
msg, hint = msgdestmerge[b'multiplebranchessourceset'][action]
raise error.ManyMergeDestAbort(msg, hint=hint)
branch = ctx.branch()
bheads = repo.branchheads(branch)
onhead = repo.revs(b'%ld and %ln', sourceset, bheads)
if onheadcheck and not onhead:
# Case A: working copy if not on a head. (merge only)
#
# This is probably a user mistake We bailout pointing at 'hg update'
if len(repo.heads()) <= 1:
msg, hint = msgdestmerge[b'nootherheadsbehind'][action]
else:
msg, hint = msgdestmerge[b'notatheads'][action]
raise error.Abort(msg, hint=hint)
# remove heads descendants of source from the set
bheads = list(repo.revs(b'%ln - (%ld::)', bheads, sourceset))
# filters out bookmarked heads
nbhs = list(repo.revs(b'%ld - bookmark()', bheads))
if destspace is not None:
# restrict search space
# used in the 'hg pull --rebase' case, see issue 5214.
nbhs = list(repo.revs(b'%ld and %ld', destspace, nbhs))
if len(nbhs) > 1:
# Case B: There is more than 1 other anonymous heads
#
# This means that there will be more than 1 candidate. This is
# ambiguous. We abort asking the user to pick as explicit destination
# instead.
msg, hint = msgdestmerge[b'toomanyheads'][action]
msg %= (branch, len(bheads) + 1)
raise error.ManyMergeDestAbort(msg, hint=hint)
elif not nbhs:
# Case B: There is no other anonymous heads
#
# This means that there is no natural candidate to merge with.
# We abort, with various messages for various cases.
if bheads:
msg, hint = msgdestmerge[b'bookmarkedheads'][action]
elif len(repo.heads()) > 1:
msg, hint = msgdestmerge[b'nootherbranchheads'][action]
msg %= branch
elif not onhead:
# if 'onheadcheck == False' (rebase case),
# this was not caught in Case A.
msg, hint = msgdestmerge[b'nootherheadsbehind'][action]
else:
msg, hint = msgdestmerge[b'nootherheads'][action]
raise error.NoMergeDestAbort(msg, hint=hint)
else:
node = nbhs[0]
assert node is not None
return node
def destmerge(
repo, action=b'merge', sourceset=None, onheadcheck=True, destspace=None
):
"""return the default destination for a merge
(or raise exception about why it can't pick one)
:action: the action being performed, controls emitted error message
"""
# destspace is here to work around issues with `hg pull --rebase` see
# issue5214 for details
if repo._activebookmark:
node = _destmergebook(
repo, action=action, sourceset=sourceset, destspace=destspace
)
else:
node = _destmergebranch(
repo,
action=action,
sourceset=sourceset,
onheadcheck=onheadcheck,
destspace=destspace,
)
return repo[node].rev()
def desthistedit(ui, repo):
"""Default base revision to edit for `hg histedit`."""
default = ui.config(b'histedit', b'defaultrev')
if default is None:
revs = stack.getstack(repo)
elif default:
revs = scmutil.revrange(repo, [default])
else:
raise error.Abort(
_(b"config option histedit.defaultrev can't be empty")
)
if revs:
# Take the first revision of the revset as the root
return revs.min()
return None
def stackbase(ui, repo):
revs = stack.getstack(repo)
return revs.first() if revs else None
def _statusotherbook(ui, repo):
bmheads = bookmarks.headsforactive(repo)
curhead = repo._bookmarks[repo._activebookmark]
if repo.revs(b'%n and parents()', curhead):
# we are on the active bookmark
bmheads = [b for b in bmheads if curhead != b]
if bmheads:
msg = _(b'%i other divergent bookmarks for "%s"\n')
ui.status(msg % (len(bmheads), repo._activebookmark))
def _statusotherbranchheads(ui, repo):
currentbranch = repo.dirstate.branch()
allheads = repo.branchheads(currentbranch, closed=True)
heads = repo.branchheads(currentbranch)
if repo.revs(b'%ln and parents()', allheads):
# we are on a head, even though it might be closed
#
# on closed otherheads
# ========= ==========
# o 0 all heads for current branch are closed
# N only descendant branch heads are closed
# x 0 there is only one non-closed branch head
# N there are some non-closed branch heads
# ========= ==========
otherheads = repo.revs(b'%ln - parents()', heads)
if repo[b'.'].closesbranch():
ui.warn(
_(
b'no open descendant heads on branch "%s", '
b'updating to a closed head\n'
)
% currentbranch
)
if otherheads:
ui.warn(
_(
b"(committing will reopen the head, "
b"use 'hg heads .' to see %i other heads)\n"
)
% (len(otherheads))
)
else:
ui.warn(
_(b'(committing will reopen branch "%s")\n') % currentbranch
)
elif otherheads:
curhead = repo[b'.']
ui.status(
_(b'updated to "%s: %s"\n')
% (curhead, curhead.description().split(b'\n')[0])
)
ui.status(
_(b'%i other heads for branch "%s"\n')
% (len(otherheads), currentbranch)
)
def statusotherdests(ui, repo):
"""Print message about other head"""
# XXX we should probably include a hint:
# - about what to do
# - how to see such heads
if repo._activebookmark:
_statusotherbook(ui, repo)
else:
_statusotherbranchheads(ui, repo)