##// END OF EJS Templates
sparse: reliably avoid writing to store without a lock...
sparse: reliably avoid writing to store without a lock With the code as written before this patch we can still end up writing to store in `debugsparse`. Obviously we'll write to it if by accident a store requirement is modified, but more importantly we write to it if another concurrent transaction modifies the requirements file on disk. We can't rule this out since we're not holding the store lock, so it's better to explicitly pass a permission to write instead of inferring it based on file contents.

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__init__.py
77 lines | 2.3 KiB | text/x-python | PythonLexer
# __init__.py - narrowhg extension
#
# Copyright 2017 Google, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''create clones which fetch history data for subset of files (EXPERIMENTAL)'''
from mercurial import (
localrepo,
registrar,
requirements,
)
from . import (
narrowbundle2,
narrowcommands,
narrowrepo,
narrowtemplates,
narrowwirepeer,
)
# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = b'ships-with-hg-core'
configtable = {}
configitem = registrar.configitem(configtable)
# Narrowhg *has* support for serving ellipsis nodes (which are used at
# least by Google's internal server), but that support is pretty
# fragile and has a lot of problems on real-world repositories that
# have complex graph topologies. This could probably be corrected, but
# absent someone needing the full support for ellipsis nodes in
# repositories with merges, it's unlikely this work will get done. As
# of this writining in late 2017, all repositories large enough for
# ellipsis nodes to be a hard requirement also enforce strictly linear
# history for other scaling reasons.
configitem(
b'experimental',
b'narrowservebrokenellipses',
default=False,
alias=[(b'narrow', b'serveellipses')],
)
# Export the commands table for Mercurial to see.
cmdtable = narrowcommands.table
def featuresetup(ui, features):
features.add(requirements.NARROW_REQUIREMENT)
def uisetup(ui):
"""Wraps user-facing mercurial commands with narrow-aware versions."""
localrepo.featuresetupfuncs.add(featuresetup)
narrowbundle2.setup()
narrowcommands.setup()
narrowwirepeer.uisetup()
def reposetup(ui, repo):
"""Wraps local repositories with narrow repo support."""
if not repo.local():
return
repo.ui.setconfig(b'experimental', b'narrow', True, b'narrow-ext')
if requirements.NARROW_REQUIREMENT in repo.requirements:
narrowrepo.wraprepo(repo)
narrowwirepeer.reposetup(repo)
templatekeyword = narrowtemplates.templatekeyword
revsetpredicate = narrowtemplates.revsetpredicate