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62 lines
1.7 KiB
Python
62 lines
1.7 KiB
Python
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"""
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Ensure that the local copy of distutils is preferred over stdlib.
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See https://github.com/pypa/setuptools/issues/417#issuecomment-392298401
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for more motivation.
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"""
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import sys
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import re
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import os
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import importlib
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import warnings
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is_pypy = '__pypy__' in sys.builtin_module_names
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def warn_distutils_present():
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if 'distutils' not in sys.modules:
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return
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if is_pypy and sys.version_info < (3, 7):
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# PyPy for 3.6 unconditionally imports distutils, so bypass the warning
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# https://foss.heptapod.net/pypy/pypy/-/blob/be829135bc0d758997b3566062999ee8b23872b4/lib-python/3/site.py#L250
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return
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warnings.warn(
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"Distutils was imported before Setuptools. This usage is discouraged "
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"and may exhibit undesirable behaviors or errors. Please use "
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"Setuptools' objects directly or at least import Setuptools first.")
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def clear_distutils():
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if 'distutils' not in sys.modules:
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return
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warnings.warn("Setuptools is replacing distutils.")
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mods = [name for name in sys.modules if re.match(r'distutils\b', name)]
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for name in mods:
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del sys.modules[name]
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def enabled():
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"""
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Allow selection of distutils by environment variable.
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"""
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which = os.environ.get('SETUPTOOLS_USE_DISTUTILS', 'stdlib')
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return which == 'local'
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def ensure_local_distutils():
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clear_distutils()
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distutils = importlib.import_module('setuptools._distutils')
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distutils.__name__ = 'distutils'
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sys.modules['distutils'] = distutils
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# sanity check that submodules load as expected
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core = importlib.import_module('distutils.core')
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assert '_distutils' in core.__file__, core.__file__
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warn_distutils_present()
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if enabled():
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ensure_local_distutils()
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