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annotate lib/python3.8/site-packages/pip/_vendor/pep517/envbuild.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 """Build wheels/sdists by installing build deps to a temporary environment.
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2 """
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3
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4 import os
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5 import logging
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6 import toml
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7 import shutil
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8 from subprocess import check_call
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9 import sys
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10 from sysconfig import get_paths
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11 from tempfile import mkdtemp
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12
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13 from .wrappers import Pep517HookCaller, LoggerWrapper
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14
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15 log = logging.getLogger(__name__)
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16
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17
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18 def _load_pyproject(source_dir):
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19 with open(os.path.join(source_dir, 'pyproject.toml')) as f:
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20 pyproject_data = toml.load(f)
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21 buildsys = pyproject_data['build-system']
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22 return (
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23 buildsys['requires'],
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24 buildsys['build-backend'],
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25 buildsys.get('backend-path'),
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26 )
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27
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28
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29 class BuildEnvironment(object):
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30 """Context manager to install build deps in a simple temporary environment
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31
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32 Based on code I wrote for pip, which is MIT licensed.
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33 """
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34 # Copyright (c) 2008-2016 The pip developers (see AUTHORS.txt file)
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35 #
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36 # Permission is hereby granted, free of charge, to any person obtaining
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37 # a copy of this software and associated documentation files (the
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38 # "Software"), to deal in the Software without restriction, including
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39 # without limitation the rights to use, copy, modify, merge, publish,
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40 # distribute, sublicense, and/or sell copies of the Software, and to
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41 # permit persons to whom the Software is furnished to do so, subject to
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42 # the following conditions:
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43 #
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44 # The above copyright notice and this permission notice shall be
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45 # included in all copies or substantial portions of the Software.
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46 #
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47 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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48 # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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49 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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50 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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51 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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52 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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53 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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54
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55 path = None
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56
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57 def __init__(self, cleanup=True):
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58 self._cleanup = cleanup
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59
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60 def __enter__(self):
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61 self.path = mkdtemp(prefix='pep517-build-env-')
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62 log.info('Temporary build environment: %s', self.path)
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63
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64 self.save_path = os.environ.get('PATH', None)
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65 self.save_pythonpath = os.environ.get('PYTHONPATH', None)
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66
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67 install_scheme = 'nt' if (os.name == 'nt') else 'posix_prefix'
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68 install_dirs = get_paths(install_scheme, vars={
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69 'base': self.path,
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70 'platbase': self.path,
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71 })
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72
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73 scripts = install_dirs['scripts']
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74 if self.save_path:
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75 os.environ['PATH'] = scripts + os.pathsep + self.save_path
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76 else:
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77 os.environ['PATH'] = scripts + os.pathsep + os.defpath
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78
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79 if install_dirs['purelib'] == install_dirs['platlib']:
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80 lib_dirs = install_dirs['purelib']
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81 else:
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82 lib_dirs = install_dirs['purelib'] + os.pathsep + \
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83 install_dirs['platlib']
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84 if self.save_pythonpath:
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85 os.environ['PYTHONPATH'] = lib_dirs + os.pathsep + \
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86 self.save_pythonpath
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87 else:
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88 os.environ['PYTHONPATH'] = lib_dirs
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89
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90 return self
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91
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92 def pip_install(self, reqs):
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93 """Install dependencies into this env by calling pip in a subprocess"""
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94 if not reqs:
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95 return
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96 log.info('Calling pip to install %s', reqs)
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97 cmd = [
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98 sys.executable, '-m', 'pip', 'install', '--ignore-installed',
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99 '--prefix', self.path] + list(reqs)
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100 check_call(
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101 cmd,
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102 stdout=LoggerWrapper(log, logging.INFO),
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103 stderr=LoggerWrapper(log, logging.ERROR),
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104 )
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105
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106 def __exit__(self, exc_type, exc_val, exc_tb):
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107 needs_cleanup = (
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108 self._cleanup and
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109 self.path is not None and
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110 os.path.isdir(self.path)
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111 )
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112 if needs_cleanup:
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113 shutil.rmtree(self.path)
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114
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115 if self.save_path is None:
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116 os.environ.pop('PATH', None)
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117 else:
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118 os.environ['PATH'] = self.save_path
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119
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120 if self.save_pythonpath is None:
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121 os.environ.pop('PYTHONPATH', None)
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122 else:
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123 os.environ['PYTHONPATH'] = self.save_pythonpath
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124
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125
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126 def build_wheel(source_dir, wheel_dir, config_settings=None):
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127 """Build a wheel from a source directory using PEP 517 hooks.
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128
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129 :param str source_dir: Source directory containing pyproject.toml
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130 :param str wheel_dir: Target directory to create wheel in
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131 :param dict config_settings: Options to pass to build backend
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132
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133 This is a blocking function which will run pip in a subprocess to install
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134 build requirements.
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135 """
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136 if config_settings is None:
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137 config_settings = {}
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138 requires, backend, backend_path = _load_pyproject(source_dir)
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139 hooks = Pep517HookCaller(source_dir, backend, backend_path)
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140
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141 with BuildEnvironment() as env:
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142 env.pip_install(requires)
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143 reqs = hooks.get_requires_for_build_wheel(config_settings)
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144 env.pip_install(reqs)
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145 return hooks.build_wheel(wheel_dir, config_settings)
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146
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147
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148 def build_sdist(source_dir, sdist_dir, config_settings=None):
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149 """Build an sdist from a source directory using PEP 517 hooks.
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150
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151 :param str source_dir: Source directory containing pyproject.toml
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152 :param str sdist_dir: Target directory to place sdist in
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153 :param dict config_settings: Options to pass to build backend
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154
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155 This is a blocking function which will run pip in a subprocess to install
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156 build requirements.
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157 """
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158 if config_settings is None:
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159 config_settings = {}
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160 requires, backend, backend_path = _load_pyproject(source_dir)
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161 hooks = Pep517HookCaller(source_dir, backend, backend_path)
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162
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163 with BuildEnvironment() as env:
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164 env.pip_install(requires)
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165 reqs = hooks.get_requires_for_build_sdist(config_settings)
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166 env.pip_install(reqs)
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167 return hooks.build_sdist(sdist_dir, config_settings)