Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/_distutils_hack/__init__.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 import sys |
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2 import os |
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3 import re |
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4 import importlib |
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5 import warnings |
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6 |
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7 |
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8 is_pypy = '__pypy__' in sys.builtin_module_names |
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9 |
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10 |
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11 def warn_distutils_present(): |
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12 if 'distutils' not in sys.modules: |
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13 return |
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14 if is_pypy and sys.version_info < (3, 7): |
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15 # PyPy for 3.6 unconditionally imports distutils, so bypass the warning |
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16 # https://foss.heptapod.net/pypy/pypy/-/blob/be829135bc0d758997b3566062999ee8b23872b4/lib-python/3/site.py#L250 |
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17 return |
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18 warnings.warn( |
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19 "Distutils was imported before Setuptools, but importing Setuptools " |
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20 "also replaces the `distutils` module in `sys.modules`. This may lead " |
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21 "to undesirable behaviors or errors. To avoid these issues, avoid " |
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22 "using distutils directly, ensure that setuptools is installed in the " |
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23 "traditional way (e.g. not an editable install), and/or make sure " |
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24 "that setuptools is always imported before distutils.") |
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25 |
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26 |
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27 def clear_distutils(): |
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28 if 'distutils' not in sys.modules: |
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29 return |
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30 warnings.warn("Setuptools is replacing distutils.") |
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31 mods = [name for name in sys.modules if re.match(r'distutils\b', name)] |
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32 for name in mods: |
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33 del sys.modules[name] |
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34 |
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35 |
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36 def enabled(): |
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37 """ |
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38 Allow selection of distutils by environment variable. |
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39 """ |
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40 which = os.environ.get('SETUPTOOLS_USE_DISTUTILS', 'stdlib') |
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41 return which == 'local' |
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42 |
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43 |
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44 def ensure_local_distutils(): |
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45 clear_distutils() |
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46 distutils = importlib.import_module('setuptools._distutils') |
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47 distutils.__name__ = 'distutils' |
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48 sys.modules['distutils'] = distutils |
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49 |
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50 # sanity check that submodules load as expected |
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51 core = importlib.import_module('distutils.core') |
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52 assert '_distutils' in core.__file__, core.__file__ |
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53 |
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54 |
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55 def do_override(): |
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56 """ |
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57 Ensure that the local copy of distutils is preferred over stdlib. |
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58 |
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59 See https://github.com/pypa/setuptools/issues/417#issuecomment-392298401 |
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60 for more motivation. |
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61 """ |
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62 if enabled(): |
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63 warn_distutils_present() |
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64 ensure_local_distutils() |
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65 |
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66 |
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67 class DistutilsMetaFinder: |
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68 def find_spec(self, fullname, path, target=None): |
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69 if path is not None: |
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70 return |
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71 |
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72 method_name = 'spec_for_{fullname}'.format(**locals()) |
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73 method = getattr(self, method_name, lambda: None) |
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74 return method() |
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75 |
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76 def spec_for_distutils(self): |
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77 import importlib.abc |
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78 import importlib.util |
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79 |
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80 class DistutilsLoader(importlib.abc.Loader): |
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81 |
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82 def create_module(self, spec): |
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83 return importlib.import_module('setuptools._distutils') |
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84 |
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85 def exec_module(self, module): |
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86 pass |
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87 |
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88 return importlib.util.spec_from_loader('distutils', DistutilsLoader()) |
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89 |
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90 def spec_for_pip(self): |
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91 """ |
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92 Ensure stdlib distutils when running under pip. |
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93 See pypa/pip#8761 for rationale. |
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94 """ |
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95 if self.pip_imported_during_build(): |
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96 return |
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97 clear_distutils() |
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98 self.spec_for_distutils = lambda: None |
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99 |
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100 @staticmethod |
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101 def pip_imported_during_build(): |
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102 """ |
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103 Detect if pip is being imported in a build script. Ref #2355. |
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104 """ |
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105 import traceback |
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106 return any( |
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107 frame.f_globals['__file__'].endswith('setup.py') |
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108 for frame, line in traceback.walk_stack(None) |
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109 ) |
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110 |
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111 |
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112 DISTUTILS_FINDER = DistutilsMetaFinder() |
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113 |
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114 |
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115 def add_shim(): |
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116 sys.meta_path.insert(0, DISTUTILS_FINDER) |
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117 |
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118 |
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119 def remove_shim(): |
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120 try: |
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121 sys.meta_path.remove(DISTUTILS_FINDER) |
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122 except ValueError: |
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123 pass |