mercurial/policy.py
author Durham Goode <durham@fb.com>
Tue, 20 Sep 2016 12:24:01 -0700
changeset 29963 483003c27938
parent 29490 b4d117cee636
child 31317 62939e0148f1
permissions -rw-r--r--
manifest: move treeinmem onto manifestlog A previous patched moved all the serialization related options onto manifestrevlog (since it is responsible for serialization). Let's move the treeinmem option on manifestlog, since it is responsible for materialization decisions. This reduces the number of dependencies manifestlog has on the old manifest type as well, so we can eventually make them completely independent of each other.

# 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, require the C extensions for performance reasons.
policy = 'c'
policynoc = ('cffi', 'cffi-allow', 'py')
policynocffi = ('c', 'py')

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 '__pypy__' in sys.builtin_module_names:
    policy = '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 = 'py'

# Environment variable can always force settings.
policy = os.environ.get('HGMODULEPOLICY', policy)