hgext/narrow/__init__.py

narrow: move .hg/narrowspec to .hg/store/narrowspec (BC)

The narrowspec is more closely related to the store than to the
working copy. For example, if the narrowspec changes, the set of
revlogs also needs to change (the working copy may change, but that
depends on which commit is checked out). Also, when using the share
extension, the narrowspec needs to be shared along with the
store. This patch therefore moves the narrowspec into the store/
directory.

This is clearly a breaking change, but I haven't bothered trying to
fall back to reading the narrowspec from the old location (.hg/),
because there are very few users of narrow out there. (We'll add a
temporary hack to our Google-internal extension to handle the
migration.)

Differential Revision: https://phab.mercurial-scm.org/D4099

# __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 __future__ import absolute_import

# 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 = 'ships-with-hg-core'

from mercurial import (
    extensions,
    localrepo,
    registrar,
    repository,
    verify as verifymod,
)

from . import (
    narrowbundle2,
    narrowchangegroup,
    narrowcommands,
    narrowcopies,
    narrowpatch,
    narrowrepo,
    narrowrevlog,
    narrowtemplates,
    narrowwirepeer,
)

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('experimental', 'narrowservebrokenellipses',
           default=False,
           alias=[('narrow', 'serveellipses')],
)

# Export the commands table for Mercurial to see.
cmdtable = narrowcommands.table

def featuresetup(ui, features):
    features.add(repository.NARROW_REQUIREMENT)

def uisetup(ui):
    """Wraps user-facing mercurial commands with narrow-aware versions."""
    localrepo.featuresetupfuncs.add(featuresetup)
    narrowrevlog.setup()
    narrowbundle2.setup()
    narrowcommands.setup()
    narrowchangegroup.setup()
    narrowwirepeer.uisetup()

def reposetup(ui, repo):
    """Wraps local repositories with narrow repo support."""
    if not repo.local():
        return

    if repository.NARROW_REQUIREMENT in repo.requirements:
        narrowrepo.wraprepo(repo)
        narrowcopies.setup(repo)
        narrowpatch.setup(repo)
        narrowwirepeer.reposetup(repo)

def _verifierinit(orig, self, repo, matcher=None):
    # The verifier's matcher argument was desgined for narrowhg, so it should
    # be None from core. If another extension passes a matcher (unlikely),
    # we'll have to fail until matchers can be composed more easily.
    assert matcher is None
    orig(self, repo, repo.narrowmatch())

def extsetup(ui):
    extensions.wrapfunction(verifymod.verifier, '__init__', _verifierinit)

templatekeyword = narrowtemplates.templatekeyword
revsetpredicate = narrowtemplates.revsetpredicate