branchcache: add a "pure topological head" fast path
In a narrow but actually quick common case, all topological heads are all on
the same branch and all open. In this case, computing the branch map is very
simple. We can quickly detect situation where this situation will not change.
So we update the V3 format to be able to express this situation and upgrade the
update code to detect we remains in that mode.
The branch cache is populated with the actual value when the branch map is
accessed, but the update_disk method can do the update without needing to
populate it.
# pullext.py - Simple extension to test pulling
#
# Copyright 2018 Gregory Szorc <gregory.szorc@gmail.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 mercurial.i18n import _
from mercurial import (
commands,
error,
extensions,
localrepo,
requirements,
)
def clonecommand(orig, ui, repo, *args, **kwargs):
if kwargs.get('include') or kwargs.get('exclude'):
kwargs['narrow'] = True
if kwargs.get('depth'):
try:
kwargs['depth'] = int(kwargs['depth'])
except ValueError:
raise error.Abort(_('--depth must be an integer'))
return orig(ui, repo, *args, **kwargs)
def featuresetup(ui, features):
features.add(requirements.NARROW_REQUIREMENT)
def extsetup(ui):
entry = extensions.wrapcommand(commands.table, b'clone', clonecommand)
hasinclude = any(x[1] == b'include' for x in entry[1])
hasdepth = any(x[1] == b'depth' for x in entry[1])
if not hasinclude:
entry[1].append(
(b'', b'include', [], _(b'pattern of file/directory to clone'))
)
entry[1].append(
(b'', b'exclude', [], _(b'pattern of file/directory to not clone'))
)
if not hasdepth:
entry[1].append(
(b'', b'depth', b'', _(b'ancestry depth of changesets to fetch'))
)
localrepo.featuresetupfuncs.add(featuresetup)