Mercurial > hg
annotate mercurial/policy.py @ 30397:564b33acc21f
patch: migrate to util.iterfile
author | Jun Wu <quark@fb.com> |
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date | Mon, 14 Nov 2016 23:14:06 +0000 |
parents | b4d117cee636 |
children | 62939e0148f1 |
rev | line source |
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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) |