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We're going to make the 'c' policy more strict, where no missing attribute will be allowed. Since we want to run 'hg bisect' without rebuilding the C extension modules, we'll need a looser policy for development environment. The default for system installation isn't changed. Note that the current 'c' policy is practically 'allow'-ish as we have lots of adhoc fallbacks to pure functions.
52 lines
1.6 KiB
Python
52 lines
1.6 KiB
Python
# policy.py - module policy logic for Mercurial.
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#
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# Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import os
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import sys
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# Rules for how modules can be loaded. Values are:
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#
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# c - require C extensions
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# allow - allow pure Python implementation when C loading fails
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# cffi - required cffi versions (implemented within pure module)
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# cffi-allow - allow pure Python implementation if cffi version is missing
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# py - only load pure Python modules
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#
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# By default, fall back to the pure modules so the in-place build can
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# run without recompiling the C extensions. This will be overridden by
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# __modulepolicy__ generated by setup.py.
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policy = b'allow'
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policynoc = (b'cffi', b'cffi-allow', b'py')
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policynocffi = (b'c', b'py')
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try:
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from . import __modulepolicy__
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policy = __modulepolicy__.modulepolicy
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except ImportError:
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pass
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# PyPy doesn't load C extensions.
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#
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# The canonical way to do this is to test platform.python_implementation().
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# But we don't import platform and don't bloat for it here.
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if r'__pypy__' in sys.builtin_module_names:
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policy = b'cffi'
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# Our C extensions aren't yet compatible with Python 3. So use pure Python
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# on Python 3 for now.
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if sys.version_info[0] >= 3:
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policy = b'py'
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# Environment variable can always force settings.
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if sys.version_info[0] >= 3:
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if r'HGMODULEPOLICY' in os.environ:
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policy = os.environ[r'HGMODULEPOLICY'].encode(r'utf-8')
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else:
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policy = os.environ.get(r'HGMODULEPOLICY', policy)
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