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annotate mercurial/policy.py @ 31267:11831d755b51

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merge: remove uses of manifest.matches This gets rid of the manifest.matches calls in merge.py in favor of the new api. This is part of getting rid of manifest.matches since it is O(manifest).
author Durham Goode <durham@fb.com>
date Tue, 07 Mar 2017 18:38:20 -0800
parents b4d117cee636
children 62939e0148f1
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1 # policy.py - module policy logic for Mercurial.
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2 #
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3 # Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 import os
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11 import sys
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12
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13 # Rules for how modules can be loaded. Values are:
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14 #
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15 # c - require C extensions
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16 # allow - allow pure Python implementation when C loading fails
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17 # cffi - required cffi versions (implemented within pure module)
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18 # cffi-allow - allow pure Python implementation if cffi version is missing
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19 # py - only load pure Python modules
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20 #
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21 # By default, require the C extensions for performance reasons.
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22 policy = 'c'
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23 policynoc = ('cffi', 'cffi-allow', 'py')
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24 policynocffi = ('c', 'py')
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25
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26 try:
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27 from . import __modulepolicy__
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28 policy = __modulepolicy__.modulepolicy
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29 except ImportError:
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30 pass
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31
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32 # PyPy doesn't load C extensions.
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33 #
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34 # The canonical way to do this is to test platform.python_implementation().
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35 # But we don't import platform and don't bloat for it here.
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36 if '__pypy__' in sys.builtin_module_names:
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37 policy = 'cffi'
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38
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39 # Our C extensions aren't yet compatible with Python 3. So use pure Python
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40 # on Python 3 for now.
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41 if sys.version_info[0] >= 3:
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42 policy = 'py'
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43
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44 # Environment variable can always force settings.
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45 policy = os.environ.get('HGMODULEPOLICY', policy)