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annotate lib/python3.8/site-packages/pip/_vendor/pep517/wrappers.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 import threading
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2 from contextlib import contextmanager
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3 import os
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4 from os.path import dirname, abspath, join as pjoin
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5 import shutil
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6 from subprocess import check_call, check_output, STDOUT
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7 import sys
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8 from tempfile import mkdtemp
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9
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10 from . import compat
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11
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12 _in_proc_script = pjoin(dirname(abspath(__file__)), '_in_process.py')
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14
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15 @contextmanager
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16 def tempdir():
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17 td = mkdtemp()
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18 try:
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19 yield td
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20 finally:
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21 shutil.rmtree(td)
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22
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23
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24 class BackendUnavailable(Exception):
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25 """Will be raised if the backend cannot be imported in the hook process."""
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26 def __init__(self, traceback):
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27 self.traceback = traceback
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28
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29
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30 class BackendInvalid(Exception):
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31 """Will be raised if the backend is invalid."""
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32 def __init__(self, backend_name, backend_path, message):
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33 self.backend_name = backend_name
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34 self.backend_path = backend_path
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35 self.message = message
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36
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37
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38 class HookMissing(Exception):
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39 """Will be raised on missing hooks."""
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40 def __init__(self, hook_name):
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41 super(HookMissing, self).__init__(hook_name)
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42 self.hook_name = hook_name
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43
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44
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45 class UnsupportedOperation(Exception):
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46 """May be raised by build_sdist if the backend indicates that it can't."""
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47 def __init__(self, traceback):
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48 self.traceback = traceback
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49
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50
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51 def default_subprocess_runner(cmd, cwd=None, extra_environ=None):
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52 """The default method of calling the wrapper subprocess."""
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53 env = os.environ.copy()
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54 if extra_environ:
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55 env.update(extra_environ)
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56
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57 check_call(cmd, cwd=cwd, env=env)
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58
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59
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60 def quiet_subprocess_runner(cmd, cwd=None, extra_environ=None):
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61 """A method of calling the wrapper subprocess while suppressing output."""
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62 env = os.environ.copy()
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63 if extra_environ:
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64 env.update(extra_environ)
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65
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66 check_output(cmd, cwd=cwd, env=env, stderr=STDOUT)
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67
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68
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69 def norm_and_check(source_tree, requested):
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70 """Normalise and check a backend path.
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71
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72 Ensure that the requested backend path is specified as a relative path,
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73 and resolves to a location under the given source tree.
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74
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75 Return an absolute version of the requested path.
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76 """
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77 if os.path.isabs(requested):
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78 raise ValueError("paths must be relative")
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79
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80 abs_source = os.path.abspath(source_tree)
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81 abs_requested = os.path.normpath(os.path.join(abs_source, requested))
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82 # We have to use commonprefix for Python 2.7 compatibility. So we
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83 # normalise case to avoid problems because commonprefix is a character
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84 # based comparison :-(
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85 norm_source = os.path.normcase(abs_source)
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86 norm_requested = os.path.normcase(abs_requested)
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87 if os.path.commonprefix([norm_source, norm_requested]) != norm_source:
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88 raise ValueError("paths must be inside source tree")
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89
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90 return abs_requested
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91
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92
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93 class Pep517HookCaller(object):
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94 """A wrapper around a source directory to be built with a PEP 517 backend.
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95
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96 source_dir : The path to the source directory, containing pyproject.toml.
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97 build_backend : The build backend spec, as per PEP 517, from
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98 pyproject.toml.
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99 backend_path : The backend path, as per PEP 517, from pyproject.toml.
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100 runner : A callable that invokes the wrapper subprocess.
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101
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102 The 'runner', if provided, must expect the following:
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103 cmd : a list of strings representing the command and arguments to
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104 execute, as would be passed to e.g. 'subprocess.check_call'.
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105 cwd : a string representing the working directory that must be
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106 used for the subprocess. Corresponds to the provided source_dir.
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107 extra_environ : a dict mapping environment variable names to values
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108 which must be set for the subprocess execution.
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109 """
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110 def __init__(
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111 self,
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112 source_dir,
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113 build_backend,
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114 backend_path=None,
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115 runner=None,
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116 ):
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117 if runner is None:
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118 runner = default_subprocess_runner
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119
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120 self.source_dir = abspath(source_dir)
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121 self.build_backend = build_backend
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122 if backend_path:
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123 backend_path = [
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124 norm_and_check(self.source_dir, p) for p in backend_path
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125 ]
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126 self.backend_path = backend_path
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127 self._subprocess_runner = runner
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128
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129 # TODO: Is this over-engineered? Maybe frontends only need to
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130 # set this when creating the wrapper, not on every call.
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131 @contextmanager
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132 def subprocess_runner(self, runner):
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133 """A context manager for temporarily overriding the default subprocess
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134 runner.
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135 """
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136 prev = self._subprocess_runner
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137 self._subprocess_runner = runner
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138 yield
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139 self._subprocess_runner = prev
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140
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141 def get_requires_for_build_wheel(self, config_settings=None):
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142 """Identify packages required for building a wheel
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143
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144 Returns a list of dependency specifications, e.g.:
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145 ["wheel >= 0.25", "setuptools"]
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146
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147 This does not include requirements specified in pyproject.toml.
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148 It returns the result of calling the equivalently named hook in a
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149 subprocess.
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150 """
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151 return self._call_hook('get_requires_for_build_wheel', {
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152 'config_settings': config_settings
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153 })
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154
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155 def prepare_metadata_for_build_wheel(
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156 self, metadata_directory, config_settings=None,
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157 _allow_fallback=True):
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158 """Prepare a *.dist-info folder with metadata for this project.
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159
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160 Returns the name of the newly created folder.
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161
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162 If the build backend defines a hook with this name, it will be called
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163 in a subprocess. If not, the backend will be asked to build a wheel,
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164 and the dist-info extracted from that (unless _allow_fallback is
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165 False).
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166 """
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167 return self._call_hook('prepare_metadata_for_build_wheel', {
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168 'metadata_directory': abspath(metadata_directory),
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169 'config_settings': config_settings,
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170 '_allow_fallback': _allow_fallback,
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171 })
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172
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173 def build_wheel(
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174 self, wheel_directory, config_settings=None,
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175 metadata_directory=None):
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176 """Build a wheel from this project.
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177
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178 Returns the name of the newly created file.
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179
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180 In general, this will call the 'build_wheel' hook in the backend.
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181 However, if that was previously called by
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182 'prepare_metadata_for_build_wheel', and the same metadata_directory is
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183 used, the previously built wheel will be copied to wheel_directory.
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184 """
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185 if metadata_directory is not None:
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186 metadata_directory = abspath(metadata_directory)
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187 return self._call_hook('build_wheel', {
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188 'wheel_directory': abspath(wheel_directory),
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189 'config_settings': config_settings,
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190 'metadata_directory': metadata_directory,
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191 })
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192
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193 def get_requires_for_build_sdist(self, config_settings=None):
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194 """Identify packages required for building a wheel
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195
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196 Returns a list of dependency specifications, e.g.:
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197 ["setuptools >= 26"]
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198
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199 This does not include requirements specified in pyproject.toml.
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200 It returns the result of calling the equivalently named hook in a
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201 subprocess.
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202 """
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203 return self._call_hook('get_requires_for_build_sdist', {
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204 'config_settings': config_settings
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205 })
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206
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207 def build_sdist(self, sdist_directory, config_settings=None):
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208 """Build an sdist from this project.
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209
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210 Returns the name of the newly created file.
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211
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212 This calls the 'build_sdist' backend hook in a subprocess.
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213 """
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214 return self._call_hook('build_sdist', {
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215 'sdist_directory': abspath(sdist_directory),
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216 'config_settings': config_settings,
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217 })
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218
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219 def _call_hook(self, hook_name, kwargs):
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220 # On Python 2, pytoml returns Unicode values (which is correct) but the
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221 # environment passed to check_call needs to contain string values. We
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222 # convert here by encoding using ASCII (the backend can only contain
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223 # letters, digits and _, . and : characters, and will be used as a
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224 # Python identifier, so non-ASCII content is wrong on Python 2 in
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225 # any case).
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226 # For backend_path, we use sys.getfilesystemencoding.
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227 if sys.version_info[0] == 2:
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228 build_backend = self.build_backend.encode('ASCII')
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229 else:
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230 build_backend = self.build_backend
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231 extra_environ = {'PEP517_BUILD_BACKEND': build_backend}
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232
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233 if self.backend_path:
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234 backend_path = os.pathsep.join(self.backend_path)
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235 if sys.version_info[0] == 2:
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236 backend_path = backend_path.encode(sys.getfilesystemencoding())
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237 extra_environ['PEP517_BACKEND_PATH'] = backend_path
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238
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239 with tempdir() as td:
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240 hook_input = {'kwargs': kwargs}
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241 compat.write_json(hook_input, pjoin(td, 'input.json'),
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242 indent=2)
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243
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244 # Run the hook in a subprocess
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245 self._subprocess_runner(
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246 [sys.executable, _in_proc_script, hook_name, td],
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247 cwd=self.source_dir,
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248 extra_environ=extra_environ
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249 )
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250
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251 data = compat.read_json(pjoin(td, 'output.json'))
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252 if data.get('unsupported'):
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253 raise UnsupportedOperation(data.get('traceback', ''))
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254 if data.get('no_backend'):
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255 raise BackendUnavailable(data.get('traceback', ''))
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256 if data.get('backend_invalid'):
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257 raise BackendInvalid(
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258 backend_name=self.build_backend,
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259 backend_path=self.backend_path,
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260 message=data.get('backend_error', '')
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261 )
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262 if data.get('hook_missing'):
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263 raise HookMissing(hook_name)
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264 return data['return_val']
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265
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266
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267 class LoggerWrapper(threading.Thread):
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268 """
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269 Read messages from a pipe and redirect them
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270 to a logger (see python's logging module).
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271 """
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272
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273 def __init__(self, logger, level):
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274 threading.Thread.__init__(self)
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275 self.daemon = True
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276
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277 self.logger = logger
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278 self.level = level
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279
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280 # create the pipe and reader
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281 self.fd_read, self.fd_write = os.pipe()
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282 self.reader = os.fdopen(self.fd_read)
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283
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284 self.start()
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285
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286 def fileno(self):
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287 return self.fd_write
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288
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289 @staticmethod
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290 def remove_newline(msg):
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291 return msg[:-1] if msg.endswith(os.linesep) else msg
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292
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293 def run(self):
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294 for line in self.reader:
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295 self._write(self.remove_newline(line))
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296
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297 def _write(self, message):
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298 self.logger.log(self.level, message)