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context: introduce p[12]copies() methods and debugp[12]copies commands...
context: introduce p[12]copies() methods and debugp[12]copies commands As mentioned earlier, I'm working on support for storing copy metadata in the changeset instead of in the filelog. In order to transition a repo from storing metadata in filelogs to storing it in the changeset, I'm going to provide a config option for reading the metadata from the changeset, but falling back to getting it from the filelog if it's not in the changeset. In this compatiblity mode, the changeset-optmized algorithms will be used. We will then need to convert the filelog copy metadata to look like that provided by changeset copy metadata. This patch introduces methods that do just that. By having these methods here, we can start writing changeset-optimized algorithms that should work already before we add any support for storing the metadata in the changesets. This commit also includes new debugp[12]copies commands and exercises them in test-copies.t. Differential Revision: https://phab.mercurial-scm.org/D5990

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policy.py
109 lines | 3.6 KiB | text/x-python | PythonLexer
# policy.py - module policy logic for Mercurial.
#
# Copyright 2015 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 __future__ import absolute_import
import os
import sys
# Rules for how modules can be loaded. Values are:
#
# c - require C extensions
# allow - allow pure Python implementation when C loading fails
# cffi - required cffi versions (implemented within pure module)
# cffi-allow - allow pure Python implementation if cffi version is missing
# py - only load pure Python modules
#
# By default, fall back to the pure modules so the in-place build can
# run without recompiling the C extensions. This will be overridden by
# __modulepolicy__ generated by setup.py.
policy = b'allow'
_packageprefs = {
# policy: (versioned package, pure package)
b'c': (r'cext', None),
b'allow': (r'cext', r'pure'),
b'cffi': (r'cffi', None),
b'cffi-allow': (r'cffi', r'pure'),
b'py': (None, r'pure'),
}
try:
from . import __modulepolicy__
policy = __modulepolicy__.modulepolicy
except ImportError:
pass
# PyPy doesn't load C extensions.
#
# The canonical way to do this is to test platform.python_implementation().
# But we don't import platform and don't bloat for it here.
if r'__pypy__' in sys.builtin_module_names:
policy = b'cffi'
# Environment variable can always force settings.
if sys.version_info[0] >= 3:
if r'HGMODULEPOLICY' in os.environ:
policy = os.environ[r'HGMODULEPOLICY'].encode(r'utf-8')
else:
policy = os.environ.get(r'HGMODULEPOLICY', policy)
def _importfrom(pkgname, modname):
# from .<pkgname> import <modname> (where . is looked through this module)
fakelocals = {}
pkg = __import__(pkgname, globals(), fakelocals, [modname], level=1)
try:
fakelocals[modname] = mod = getattr(pkg, modname)
except AttributeError:
raise ImportError(r'cannot import name %s' % modname)
# force import; fakelocals[modname] may be replaced with the real module
getattr(mod, r'__doc__', None)
return fakelocals[modname]
# keep in sync with "version" in C modules
_cextversions = {
(r'cext', r'base85'): 1,
(r'cext', r'bdiff'): 3,
(r'cext', r'mpatch'): 1,
(r'cext', r'osutil'): 4,
(r'cext', r'parsers'): 12,
}
# map import request to other package or module
_modredirects = {
(r'cext', r'charencode'): (r'cext', r'parsers'),
(r'cffi', r'base85'): (r'pure', r'base85'),
(r'cffi', r'charencode'): (r'pure', r'charencode'),
(r'cffi', r'parsers'): (r'pure', r'parsers'),
}
def _checkmod(pkgname, modname, mod):
expected = _cextversions.get((pkgname, modname))
actual = getattr(mod, r'version', None)
if actual != expected:
raise ImportError(r'cannot import module %s.%s '
r'(expected version: %d, actual: %r)'
% (pkgname, modname, expected, actual))
def importmod(modname):
"""Import module according to policy and check API version"""
try:
verpkg, purepkg = _packageprefs[policy]
except KeyError:
raise ImportError(r'invalid HGMODULEPOLICY %r' % policy)
assert verpkg or purepkg
if verpkg:
pn, mn = _modredirects.get((verpkg, modname), (verpkg, modname))
try:
mod = _importfrom(pn, mn)
if pn == verpkg:
_checkmod(pn, mn, mod)
return mod
except ImportError:
if not purepkg:
raise
pn, mn = _modredirects.get((purepkg, modname), (purepkg, modname))
return _importfrom(pn, mn)