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annotate env/lib/python3.9/site-packages/setuptools/build_meta.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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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 import tempfile
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36
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37 import setuptools
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38 import distutils
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39
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40 from pkg_resources import parse_requirements
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41
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42 __all__ = ['get_requires_for_build_sdist',
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43 'get_requires_for_build_wheel',
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44 'prepare_metadata_for_build_wheel',
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45 'build_wheel',
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46 'build_sdist',
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47 '__legacy__',
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48 'SetupRequirementsError']
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49
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50
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51 class SetupRequirementsError(BaseException):
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52 def __init__(self, specifiers):
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53 self.specifiers = specifiers
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54
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55
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56 class Distribution(setuptools.dist.Distribution):
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57 def fetch_build_eggs(self, specifiers):
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58 specifier_list = list(map(str, parse_requirements(specifiers)))
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59
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60 raise SetupRequirementsError(specifier_list)
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61
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62 @classmethod
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63 @contextlib.contextmanager
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64 def patch(cls):
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65 """
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66 Replace
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67 distutils.dist.Distribution with this class
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68 for the duration of this context.
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69 """
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70 orig = distutils.core.Distribution
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71 distutils.core.Distribution = cls
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72 try:
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73 yield
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74 finally:
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75 distutils.core.Distribution = orig
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76
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77
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78 @contextlib.contextmanager
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79 def no_install_setup_requires():
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80 """Temporarily disable installing setup_requires
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81
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82 Under PEP 517, the backend reports build dependencies to the frontend,
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83 and the frontend is responsible for ensuring they're installed.
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84 So setuptools (acting as a backend) should not try to install them.
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85 """
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86 orig = setuptools._install_setup_requires
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87 setuptools._install_setup_requires = lambda attrs: None
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88 try:
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89 yield
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90 finally:
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91 setuptools._install_setup_requires = orig
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92
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93
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94 def _get_immediate_subdirectories(a_dir):
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95 return [name for name in os.listdir(a_dir)
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96 if os.path.isdir(os.path.join(a_dir, name))]
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97
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98
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99 def _file_with_extension(directory, extension):
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100 matching = (
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101 f for f in os.listdir(directory)
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102 if f.endswith(extension)
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103 )
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104 file, = matching
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105 return file
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106
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107
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108 def _open_setup_script(setup_script):
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109 if not os.path.exists(setup_script):
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110 # Supply a default setup.py
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111 return io.StringIO(u"from setuptools import setup; setup()")
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112
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113 return getattr(tokenize, 'open', open)(setup_script)
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114
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115
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116 class _BuildMetaBackend(object):
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117
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118 def _fix_config(self, config_settings):
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119 config_settings = config_settings or {}
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120 config_settings.setdefault('--global-option', [])
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121 return config_settings
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122
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123 def _get_build_requires(self, config_settings, requirements):
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124 config_settings = self._fix_config(config_settings)
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125
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126 sys.argv = sys.argv[:1] + ['egg_info'] + \
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127 config_settings["--global-option"]
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128 try:
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129 with Distribution.patch():
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130 self.run_setup()
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131 except SetupRequirementsError as e:
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132 requirements += e.specifiers
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133
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134 return requirements
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135
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136 def run_setup(self, setup_script='setup.py'):
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137 # Note that we can reuse our build directory between calls
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138 # Correctness comes first, then optimization later
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139 __file__ = setup_script
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140 __name__ = '__main__'
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141
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142 with _open_setup_script(__file__) as f:
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143 code = f.read().replace(r'\r\n', r'\n')
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144
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145 exec(compile(code, __file__, 'exec'), locals())
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146
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147 def get_requires_for_build_wheel(self, config_settings=None):
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148 config_settings = self._fix_config(config_settings)
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149 return self._get_build_requires(
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150 config_settings, requirements=['wheel'])
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151
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152 def get_requires_for_build_sdist(self, config_settings=None):
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153 config_settings = self._fix_config(config_settings)
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154 return self._get_build_requires(config_settings, requirements=[])
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155
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156 def prepare_metadata_for_build_wheel(self, metadata_directory,
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157 config_settings=None):
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158 sys.argv = sys.argv[:1] + [
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159 'dist_info', '--egg-base', metadata_directory]
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160 with no_install_setup_requires():
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161 self.run_setup()
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162
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163 dist_info_directory = metadata_directory
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164 while True:
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165 dist_infos = [f for f in os.listdir(dist_info_directory)
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166 if f.endswith('.dist-info')]
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167
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168 if (
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169 len(dist_infos) == 0 and
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170 len(_get_immediate_subdirectories(dist_info_directory)) == 1
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171 ):
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172
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173 dist_info_directory = os.path.join(
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174 dist_info_directory, os.listdir(dist_info_directory)[0])
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175 continue
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176
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177 assert len(dist_infos) == 1
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178 break
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179
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180 # PEP 517 requires that the .dist-info directory be placed in the
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181 # metadata_directory. To comply, we MUST copy the directory to the root
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182 if dist_info_directory != metadata_directory:
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183 shutil.move(
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184 os.path.join(dist_info_directory, dist_infos[0]),
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185 metadata_directory)
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186 shutil.rmtree(dist_info_directory, ignore_errors=True)
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187
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188 return dist_infos[0]
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189
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190 def _build_with_temp_dir(self, setup_command, result_extension,
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191 result_directory, config_settings):
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192 config_settings = self._fix_config(config_settings)
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193 result_directory = os.path.abspath(result_directory)
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194
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195 # Build in a temporary directory, then copy to the target.
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196 os.makedirs(result_directory, exist_ok=True)
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197 with tempfile.TemporaryDirectory(dir=result_directory) as tmp_dist_dir:
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198 sys.argv = (sys.argv[:1] + setup_command +
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199 ['--dist-dir', tmp_dist_dir] +
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200 config_settings["--global-option"])
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201 with no_install_setup_requires():
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202 self.run_setup()
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203
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204 result_basename = _file_with_extension(
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205 tmp_dist_dir, result_extension)
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206 result_path = os.path.join(result_directory, result_basename)
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207 if os.path.exists(result_path):
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208 # os.rename will fail overwriting on non-Unix.
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209 os.remove(result_path)
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210 os.rename(os.path.join(tmp_dist_dir, result_basename), result_path)
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211
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212 return result_basename
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213
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214 def build_wheel(self, wheel_directory, config_settings=None,
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215 metadata_directory=None):
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216 return self._build_with_temp_dir(['bdist_wheel'], '.whl',
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217 wheel_directory, config_settings)
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218
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219 def build_sdist(self, sdist_directory, config_settings=None):
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220 return self._build_with_temp_dir(['sdist', '--formats', 'gztar'],
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221 '.tar.gz', sdist_directory,
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222 config_settings)
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223
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224
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225 class _BuildMetaLegacyBackend(_BuildMetaBackend):
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226 """Compatibility backend for setuptools
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227
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228 This is a version of setuptools.build_meta that endeavors
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229 to maintain backwards
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230 compatibility with pre-PEP 517 modes of invocation. It
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231 exists as a temporary
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232 bridge between the old packaging mechanism and the new
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233 packaging mechanism,
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234 and will eventually be removed.
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235 """
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236 def run_setup(self, setup_script='setup.py'):
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237 # In order to maintain compatibility with scripts assuming that
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238 # the setup.py script is in a directory on the PYTHONPATH, inject
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239 # '' into sys.path. (pypa/setuptools#1642)
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240 sys_path = list(sys.path) # Save the original path
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241
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242 script_dir = os.path.dirname(os.path.abspath(setup_script))
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243 if script_dir not in sys.path:
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244 sys.path.insert(0, script_dir)
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245
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246 # Some setup.py scripts (e.g. in pygame and numpy) use sys.argv[0] to
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247 # get the directory of the source code. They expect it to refer to the
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248 # setup.py script.
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249 sys_argv_0 = sys.argv[0]
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250 sys.argv[0] = setup_script
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251
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252 try:
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253 super(_BuildMetaLegacyBackend,
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254 self).run_setup(setup_script=setup_script)
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255 finally:
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256 # While PEP 517 frontends should be calling each hook in a fresh
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257 # subprocess according to the standard (and thus it should not be
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258 # strictly necessary to restore the old sys.path), we'll restore
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259 # the original path so that the path manipulation does not persist
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260 # within the hook after run_setup is called.
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261 sys.path[:] = sys_path
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262 sys.argv[0] = sys_argv_0
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263
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264
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265 # The primary backend
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266 _BACKEND = _BuildMetaBackend()
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267
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268 get_requires_for_build_wheel = _BACKEND.get_requires_for_build_wheel
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269 get_requires_for_build_sdist = _BACKEND.get_requires_for_build_sdist
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270 prepare_metadata_for_build_wheel = _BACKEND.prepare_metadata_for_build_wheel
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271 build_wheel = _BACKEND.build_wheel
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272 build_sdist = _BACKEND.build_sdist
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273
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274
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275 # The legacy backend
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276 __legacy__ = _BuildMetaLegacyBackend()