##// END OF EJS Templates
repair: refactor broken linkrev collection...
repair: refactor broken linkrev collection This refactors broken linkrev collection such that manifest collection is in a separate function. This allows extensions to replace the manifest collection with a non-revlog oriented version. I considered moving the collect changes function onto the manifestlog itself, so it would be behind the abstraction, but since the store we're building doesn't even have the concept of strip, embeding that concept in the manifestlog api seemed odd. Differential Revision: https://phab.mercurial-scm.org/D291

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policy.py
104 lines | 3.4 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'
# Our C extensions aren't yet compatible with Python 3. So use pure Python
# on Python 3 for now.
if sys.version_info[0] >= 3:
policy = b'py'
# 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'): 1,
(r'cext', r'diffhelpers'): 1,
(r'cext', r'mpatch'): 1,
(r'cext', r'osutil'): 1,
(r'cext', r'parsers'): 1,
}
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:
try:
mod = _importfrom(verpkg, modname)
_checkmod(verpkg, modname, mod)
return mod
except ImportError:
if not purepkg:
raise
return _importfrom(purepkg, modname)