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annotate lib/python3.8/site-packages/pip/_internal/build_env.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 Environment used for isolation during sdist building
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2 """
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3
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4 # The following comment should be removed at some point in the future.
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5 # mypy: strict-optional=False
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6 # mypy: disallow-untyped-defs=False
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7
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8 import logging
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9 import os
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10 import sys
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11 import textwrap
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12 from collections import OrderedDict
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13 from distutils.sysconfig import get_python_lib
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14 from sysconfig import get_paths
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15
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16 from pip._vendor.pkg_resources import Requirement, VersionConflict, WorkingSet
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17
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18 from pip import __file__ as pip_location
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19 from pip._internal.utils.subprocess import call_subprocess
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20 from pip._internal.utils.temp_dir import TempDirectory
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21 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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22 from pip._internal.utils.ui import open_spinner
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23
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24 if MYPY_CHECK_RUNNING:
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25 from typing import Tuple, Set, Iterable, Optional, List
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26 from pip._internal.index.package_finder import PackageFinder
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27
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28 logger = logging.getLogger(__name__)
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29
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30
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31 class _Prefix:
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32
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33 def __init__(self, path):
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34 # type: (str) -> None
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35 self.path = path
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36 self.setup = False
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37 self.bin_dir = get_paths(
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38 'nt' if os.name == 'nt' else 'posix_prefix',
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39 vars={'base': path, 'platbase': path}
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40 )['scripts']
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41 # Note: prefer distutils' sysconfig to get the
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42 # library paths so PyPy is correctly supported.
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43 purelib = get_python_lib(plat_specific=False, prefix=path)
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44 platlib = get_python_lib(plat_specific=True, prefix=path)
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45 if purelib == platlib:
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46 self.lib_dirs = [purelib]
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47 else:
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48 self.lib_dirs = [purelib, platlib]
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49
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50
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51 class BuildEnvironment(object):
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52 """Creates and manages an isolated environment to install build deps
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53 """
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54
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55 def __init__(self):
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56 # type: () -> None
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57 self._temp_dir = TempDirectory(kind="build-env")
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58
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59 self._prefixes = OrderedDict((
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60 (name, _Prefix(os.path.join(self._temp_dir.path, name)))
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61 for name in ('normal', 'overlay')
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62 ))
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63
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64 self._bin_dirs = [] # type: List[str]
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65 self._lib_dirs = [] # type: List[str]
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66 for prefix in reversed(list(self._prefixes.values())):
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67 self._bin_dirs.append(prefix.bin_dir)
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68 self._lib_dirs.extend(prefix.lib_dirs)
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69
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70 # Customize site to:
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71 # - ensure .pth files are honored
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72 # - prevent access to system site packages
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73 system_sites = {
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74 os.path.normcase(site) for site in (
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75 get_python_lib(plat_specific=False),
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76 get_python_lib(plat_specific=True),
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77 )
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78 }
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79 self._site_dir = os.path.join(self._temp_dir.path, 'site')
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80 if not os.path.exists(self._site_dir):
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81 os.mkdir(self._site_dir)
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82 with open(os.path.join(self._site_dir, 'sitecustomize.py'), 'w') as fp:
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83 fp.write(textwrap.dedent(
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84 '''
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85 import os, site, sys
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86
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87 # First, drop system-sites related paths.
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88 original_sys_path = sys.path[:]
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89 known_paths = set()
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90 for path in {system_sites!r}:
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91 site.addsitedir(path, known_paths=known_paths)
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92 system_paths = set(
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93 os.path.normcase(path)
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94 for path in sys.path[len(original_sys_path):]
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95 )
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96 original_sys_path = [
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97 path for path in original_sys_path
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98 if os.path.normcase(path) not in system_paths
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99 ]
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100 sys.path = original_sys_path
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101
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102 # Second, add lib directories.
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103 # ensuring .pth file are processed.
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104 for path in {lib_dirs!r}:
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105 assert not path in sys.path
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106 site.addsitedir(path)
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107 '''
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108 ).format(system_sites=system_sites, lib_dirs=self._lib_dirs))
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109
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110 def __enter__(self):
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111 self._save_env = {
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112 name: os.environ.get(name, None)
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113 for name in ('PATH', 'PYTHONNOUSERSITE', 'PYTHONPATH')
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114 }
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115
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116 path = self._bin_dirs[:]
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117 old_path = self._save_env['PATH']
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118 if old_path:
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119 path.extend(old_path.split(os.pathsep))
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120
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121 pythonpath = [self._site_dir]
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122
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123 os.environ.update({
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124 'PATH': os.pathsep.join(path),
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125 'PYTHONNOUSERSITE': '1',
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126 'PYTHONPATH': os.pathsep.join(pythonpath),
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127 })
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128
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129 def __exit__(self, exc_type, exc_val, exc_tb):
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130 for varname, old_value in self._save_env.items():
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131 if old_value is None:
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132 os.environ.pop(varname, None)
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133 else:
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134 os.environ[varname] = old_value
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135
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136 def cleanup(self):
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137 # type: () -> None
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138 self._temp_dir.cleanup()
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139
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140 def check_requirements(self, reqs):
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141 # type: (Iterable[str]) -> Tuple[Set[Tuple[str, str]], Set[str]]
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142 """Return 2 sets:
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143 - conflicting requirements: set of (installed, wanted) reqs tuples
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144 - missing requirements: set of reqs
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145 """
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146 missing = set()
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147 conflicting = set()
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148 if reqs:
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149 ws = WorkingSet(self._lib_dirs)
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150 for req in reqs:
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151 try:
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152 if ws.find(Requirement.parse(req)) is None:
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153 missing.add(req)
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154 except VersionConflict as e:
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155 conflicting.add((str(e.args[0].as_requirement()),
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156 str(e.args[1])))
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157 return conflicting, missing
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158
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159 def install_requirements(
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160 self,
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161 finder, # type: PackageFinder
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162 requirements, # type: Iterable[str]
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163 prefix_as_string, # type: str
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164 message # type: Optional[str]
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165 ):
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166 # type: (...) -> None
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167 prefix = self._prefixes[prefix_as_string]
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168 assert not prefix.setup
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169 prefix.setup = True
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170 if not requirements:
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171 return
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172 args = [
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173 sys.executable, os.path.dirname(pip_location), 'install',
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174 '--ignore-installed', '--no-user', '--prefix', prefix.path,
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175 '--no-warn-script-location',
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176 ] # type: List[str]
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177 if logger.getEffectiveLevel() <= logging.DEBUG:
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178 args.append('-v')
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179 for format_control in ('no_binary', 'only_binary'):
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180 formats = getattr(finder.format_control, format_control)
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181 args.extend(('--' + format_control.replace('_', '-'),
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182 ','.join(sorted(formats or {':none:'}))))
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183
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184 index_urls = finder.index_urls
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185 if index_urls:
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186 args.extend(['-i', index_urls[0]])
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187 for extra_index in index_urls[1:]:
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188 args.extend(['--extra-index-url', extra_index])
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189 else:
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190 args.append('--no-index')
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191 for link in finder.find_links:
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192 args.extend(['--find-links', link])
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193
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194 for host in finder.trusted_hosts:
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195 args.extend(['--trusted-host', host])
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196 if finder.allow_all_prereleases:
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197 args.append('--pre')
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198 args.append('--')
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199 args.extend(requirements)
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200 with open_spinner(message) as spinner:
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201 call_subprocess(args, spinner=spinner)
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202
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203
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204 class NoOpBuildEnvironment(BuildEnvironment):
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205 """A no-op drop-in replacement for BuildEnvironment
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206 """
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207
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208 def __init__(self):
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209 pass
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210
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211 def __enter__(self):
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212 pass
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213
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214 def __exit__(self, exc_type, exc_val, exc_tb):
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215 pass
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216
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217 def cleanup(self):
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218 pass
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219
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220 def install_requirements(self, finder, requirements, prefix, message):
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221 raise NotImplementedError()