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annotate lib/python3.8/site-packages/setuptools/build_meta.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 """A PEP 517 interface to setuptools
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2
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3 Previously, when a user or a command line tool (let's call it a "frontend")
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4 needed to make a request of setuptools to take a certain action, for
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5 example, generating a list of installation requirements, the frontend would
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6 would call "setup.py egg_info" or "setup.py bdist_wheel" on the command line.
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7
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8 PEP 517 defines a different method of interfacing with setuptools. Rather
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9 than calling "setup.py" directly, the frontend should:
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10
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11 1. Set the current directory to the directory with a setup.py file
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12 2. Import this module into a safe python interpreter (one in which
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13 setuptools can potentially set global variables or crash hard).
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14 3. Call one of the functions defined in PEP 517.
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15
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16 What each function does is defined in PEP 517. However, here is a "casual"
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17 definition of the functions (this definition should not be relied on for
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18 bug reports or API stability):
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19
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20 - `build_wheel`: build a wheel in the folder and return the basename
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21 - `get_requires_for_build_wheel`: get the `setup_requires` to build
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22 - `prepare_metadata_for_build_wheel`: get the `install_requires`
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23 - `build_sdist`: build an sdist in the folder and return the basename
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24 - `get_requires_for_build_sdist`: get the `setup_requires` to build
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25
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26 Again, this is not a formal definition! Just a "taste" of the module.
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27 """
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28
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29 import io
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30 import os
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31 import sys
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32 import tokenize
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33 import shutil
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34 import contextlib
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35
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36 import setuptools
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37 import distutils
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38 from setuptools.py31compat import TemporaryDirectory
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39
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40 from pkg_resources import parse_requirements
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41 from pkg_resources.py31compat import makedirs
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42
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43 __all__ = ['get_requires_for_build_sdist',
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44 'get_requires_for_build_wheel',
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45 'prepare_metadata_for_build_wheel',
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46 'build_wheel',
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47 'build_sdist',
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48 '__legacy__',
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49 'SetupRequirementsError']
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50
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51
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52 class SetupRequirementsError(BaseException):
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53 def __init__(self, specifiers):
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54 self.specifiers = specifiers
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55
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56
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57 class Distribution(setuptools.dist.Distribution):
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58 def fetch_build_eggs(self, specifiers):
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59 specifier_list = list(map(str, parse_requirements(specifiers)))
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60
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61 raise SetupRequirementsError(specifier_list)
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62
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63 @classmethod
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64 @contextlib.contextmanager
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65 def patch(cls):
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66 """
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67 Replace
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68 distutils.dist.Distribution with this class
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69 for the duration of this context.
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70 """
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71 orig = distutils.core.Distribution
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72 distutils.core.Distribution = cls
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73 try:
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74 yield
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75 finally:
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76 distutils.core.Distribution = orig
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77
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78
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79 def _to_str(s):
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80 """
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81 Convert a filename to a string (on Python 2, explicitly
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82 a byte string, not Unicode) as distutils checks for the
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83 exact type str.
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84 """
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85 if sys.version_info[0] == 2 and not isinstance(s, str):
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86 # Assume it's Unicode, as that's what the PEP says
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87 # should be provided.
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88 return s.encode(sys.getfilesystemencoding())
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89 return s
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90
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91
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92 def _get_immediate_subdirectories(a_dir):
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93 return [name for name in os.listdir(a_dir)
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94 if os.path.isdir(os.path.join(a_dir, name))]
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95
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96
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97 def _file_with_extension(directory, extension):
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98 matching = (
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99 f for f in os.listdir(directory)
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100 if f.endswith(extension)
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101 )
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102 file, = matching
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103 return file
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104
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105
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106 def _open_setup_script(setup_script):
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107 if not os.path.exists(setup_script):
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108 # Supply a default setup.py
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109 return io.StringIO(u"from setuptools import setup; setup()")
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110
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111 return getattr(tokenize, 'open', open)(setup_script)
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112
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113
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114 class _BuildMetaBackend(object):
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115
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116 def _fix_config(self, config_settings):
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117 config_settings = config_settings or {}
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118 config_settings.setdefault('--global-option', [])
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119 return config_settings
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120
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121 def _get_build_requires(self, config_settings, requirements):
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122 config_settings = self._fix_config(config_settings)
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123
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124 sys.argv = sys.argv[:1] + ['egg_info'] + \
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125 config_settings["--global-option"]
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126 try:
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127 with Distribution.patch():
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128 self.run_setup()
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129 except SetupRequirementsError as e:
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130 requirements += e.specifiers
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131
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132 return requirements
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133
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134 def run_setup(self, setup_script='setup.py'):
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135 # Note that we can reuse our build directory between calls
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136 # Correctness comes first, then optimization later
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137 __file__ = setup_script
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138 __name__ = '__main__'
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139
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140 with _open_setup_script(__file__) as f:
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141 code = f.read().replace(r'\r\n', r'\n')
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142
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143 exec(compile(code, __file__, 'exec'), locals())
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144
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145 def get_requires_for_build_wheel(self, config_settings=None):
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146 config_settings = self._fix_config(config_settings)
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147 return self._get_build_requires(
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148 config_settings, requirements=['wheel'])
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149
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150 def get_requires_for_build_sdist(self, config_settings=None):
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151 config_settings = self._fix_config(config_settings)
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152 return self._get_build_requires(config_settings, requirements=[])
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153
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154 def prepare_metadata_for_build_wheel(self, metadata_directory,
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155 config_settings=None):
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156 sys.argv = sys.argv[:1] + ['dist_info', '--egg-base',
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157 _to_str(metadata_directory)]
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158 self.run_setup()
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159
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160 dist_info_directory = metadata_directory
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161 while True:
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162 dist_infos = [f for f in os.listdir(dist_info_directory)
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163 if f.endswith('.dist-info')]
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164
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165 if (
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166 len(dist_infos) == 0 and
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167 len(_get_immediate_subdirectories(dist_info_directory)) == 1
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168 ):
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169
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170 dist_info_directory = os.path.join(
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171 dist_info_directory, os.listdir(dist_info_directory)[0])
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172 continue
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173
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174 assert len(dist_infos) == 1
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175 break
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176
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177 # PEP 517 requires that the .dist-info directory be placed in the
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178 # metadata_directory. To comply, we MUST copy the directory to the root
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179 if dist_info_directory != metadata_directory:
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180 shutil.move(
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181 os.path.join(dist_info_directory, dist_infos[0]),
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182 metadata_directory)
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183 shutil.rmtree(dist_info_directory, ignore_errors=True)
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184
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185 return dist_infos[0]
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186
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187 def _build_with_temp_dir(self, setup_command, result_extension,
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188 result_directory, config_settings):
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189 config_settings = self._fix_config(config_settings)
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190 result_directory = os.path.abspath(result_directory)
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191
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192 # Build in a temporary directory, then copy to the target.
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193 makedirs(result_directory, exist_ok=True)
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194 with TemporaryDirectory(dir=result_directory) as tmp_dist_dir:
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195 sys.argv = (sys.argv[:1] + setup_command +
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196 ['--dist-dir', tmp_dist_dir] +
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197 config_settings["--global-option"])
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198 self.run_setup()
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199
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200 result_basename = _file_with_extension(
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201 tmp_dist_dir, result_extension)
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202 result_path = os.path.join(result_directory, result_basename)
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203 if os.path.exists(result_path):
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204 # os.rename will fail overwriting on non-Unix.
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205 os.remove(result_path)
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206 os.rename(os.path.join(tmp_dist_dir, result_basename), result_path)
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207
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208 return result_basename
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209
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210 def build_wheel(self, wheel_directory, config_settings=None,
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211 metadata_directory=None):
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212 return self._build_with_temp_dir(['bdist_wheel'], '.whl',
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213 wheel_directory, config_settings)
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214
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215 def build_sdist(self, sdist_directory, config_settings=None):
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216 return self._build_with_temp_dir(['sdist', '--formats', 'gztar'],
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217 '.tar.gz', sdist_directory,
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218 config_settings)
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219
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220
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221 class _BuildMetaLegacyBackend(_BuildMetaBackend):
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222 """Compatibility backend for setuptools
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223
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224 This is a version of setuptools.build_meta that endeavors
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225 to maintain backwards
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226 compatibility with pre-PEP 517 modes of invocation. It
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227 exists as a temporary
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228 bridge between the old packaging mechanism and the new
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229 packaging mechanism,
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230 and will eventually be removed.
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231 """
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232 def run_setup(self, setup_script='setup.py'):
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233 # In order to maintain compatibility with scripts assuming that
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234 # the setup.py script is in a directory on the PYTHONPATH, inject
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235 # '' into sys.path. (pypa/setuptools#1642)
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236 sys_path = list(sys.path) # Save the original path
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237
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238 script_dir = os.path.dirname(os.path.abspath(setup_script))
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239 if script_dir not in sys.path:
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240 sys.path.insert(0, script_dir)
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241
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242 # Some setup.py scripts (e.g. in pygame and numpy) use sys.argv[0] to
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243 # get the directory of the source code. They expect it to refer to the
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244 # setup.py script.
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245 sys_argv_0 = sys.argv[0]
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246 sys.argv[0] = setup_script
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247
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248 try:
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249 super(_BuildMetaLegacyBackend,
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250 self).run_setup(setup_script=setup_script)
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251 finally:
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252 # While PEP 517 frontends should be calling each hook in a fresh
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253 # subprocess according to the standard (and thus it should not be
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254 # strictly necessary to restore the old sys.path), we'll restore
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255 # the original path so that the path manipulation does not persist
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256 # within the hook after run_setup is called.
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257 sys.path[:] = sys_path
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258 sys.argv[0] = sys_argv_0
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259
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260
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261 # The primary backend
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262 _BACKEND = _BuildMetaBackend()
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263
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264 get_requires_for_build_wheel = _BACKEND.get_requires_for_build_wheel
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265 get_requires_for_build_sdist = _BACKEND.get_requires_for_build_sdist
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266 prepare_metadata_for_build_wheel = _BACKEND.prepare_metadata_for_build_wheel
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267 build_wheel = _BACKEND.build_wheel
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268 build_sdist = _BACKEND.build_sdist
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269
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270
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271 # The legacy backend
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272 __legacy__ = _BuildMetaLegacyBackend()