Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/setuptools/sandbox.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 (2021-03-22)
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1 import os
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2 import sys
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3 import tempfile
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4 import operator
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5 import functools
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6 import itertools
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7 import re
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8 import contextlib
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9 import pickle
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10 import textwrap
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11 import builtins
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12
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13 import pkg_resources
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14 from distutils.errors import DistutilsError
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15 from pkg_resources import working_set
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16
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17 if sys.platform.startswith('java'):
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18 import org.python.modules.posix.PosixModule as _os
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19 else:
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20 _os = sys.modules[os.name]
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21 try:
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22 _file = file
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23 except NameError:
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24 _file = None
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25 _open = open
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26
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27
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28 __all__ = [
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29 "AbstractSandbox", "DirectorySandbox", "SandboxViolation", "run_setup",
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30 ]
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31
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32
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33 def _execfile(filename, globals, locals=None):
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34 """
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35 Python 3 implementation of execfile.
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36 """
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37 mode = 'rb'
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38 with open(filename, mode) as stream:
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39 script = stream.read()
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40 if locals is None:
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41 locals = globals
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42 code = compile(script, filename, 'exec')
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43 exec(code, globals, locals)
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44
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45
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46 @contextlib.contextmanager
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47 def save_argv(repl=None):
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48 saved = sys.argv[:]
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49 if repl is not None:
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50 sys.argv[:] = repl
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51 try:
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52 yield saved
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53 finally:
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54 sys.argv[:] = saved
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55
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56
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57 @contextlib.contextmanager
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58 def save_path():
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59 saved = sys.path[:]
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60 try:
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61 yield saved
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62 finally:
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63 sys.path[:] = saved
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64
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65
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66 @contextlib.contextmanager
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67 def override_temp(replacement):
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68 """
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69 Monkey-patch tempfile.tempdir with replacement, ensuring it exists
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70 """
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71 os.makedirs(replacement, exist_ok=True)
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72
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73 saved = tempfile.tempdir
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74
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75 tempfile.tempdir = replacement
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76
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77 try:
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78 yield
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79 finally:
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80 tempfile.tempdir = saved
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81
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82
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83 @contextlib.contextmanager
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84 def pushd(target):
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85 saved = os.getcwd()
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86 os.chdir(target)
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87 try:
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88 yield saved
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89 finally:
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90 os.chdir(saved)
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91
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92
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93 class UnpickleableException(Exception):
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94 """
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95 An exception representing another Exception that could not be pickled.
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96 """
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97
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98 @staticmethod
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99 def dump(type, exc):
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100 """
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101 Always return a dumped (pickled) type and exc. If exc can't be pickled,
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102 wrap it in UnpickleableException first.
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103 """
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104 try:
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105 return pickle.dumps(type), pickle.dumps(exc)
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106 except Exception:
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107 # get UnpickleableException inside the sandbox
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108 from setuptools.sandbox import UnpickleableException as cls
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109 return cls.dump(cls, cls(repr(exc)))
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110
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111
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112 class ExceptionSaver:
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113 """
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114 A Context Manager that will save an exception, serialized, and restore it
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115 later.
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116 """
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117
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118 def __enter__(self):
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119 return self
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120
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121 def __exit__(self, type, exc, tb):
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122 if not exc:
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123 return
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124
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125 # dump the exception
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126 self._saved = UnpickleableException.dump(type, exc)
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127 self._tb = tb
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128
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129 # suppress the exception
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130 return True
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131
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132 def resume(self):
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133 "restore and re-raise any exception"
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134
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135 if '_saved' not in vars(self):
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136 return
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137
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138 type, exc = map(pickle.loads, self._saved)
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139 raise exc.with_traceback(self._tb)
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140
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141
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142 @contextlib.contextmanager
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143 def save_modules():
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144 """
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145 Context in which imported modules are saved.
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146
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147 Translates exceptions internal to the context into the equivalent exception
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148 outside the context.
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149 """
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150 saved = sys.modules.copy()
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151 with ExceptionSaver() as saved_exc:
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152 yield saved
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153
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154 sys.modules.update(saved)
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155 # remove any modules imported since
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156 del_modules = (
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157 mod_name for mod_name in sys.modules
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158 if mod_name not in saved
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159 # exclude any encodings modules. See #285
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160 and not mod_name.startswith('encodings.')
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161 )
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162 _clear_modules(del_modules)
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163
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164 saved_exc.resume()
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165
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166
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167 def _clear_modules(module_names):
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168 for mod_name in list(module_names):
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169 del sys.modules[mod_name]
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170
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171
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172 @contextlib.contextmanager
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173 def save_pkg_resources_state():
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174 saved = pkg_resources.__getstate__()
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175 try:
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176 yield saved
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177 finally:
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178 pkg_resources.__setstate__(saved)
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179
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180
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181 @contextlib.contextmanager
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182 def setup_context(setup_dir):
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183 temp_dir = os.path.join(setup_dir, 'temp')
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184 with save_pkg_resources_state():
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185 with save_modules():
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186 with save_path():
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187 hide_setuptools()
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188 with save_argv():
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189 with override_temp(temp_dir):
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190 with pushd(setup_dir):
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191 # ensure setuptools commands are available
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192 __import__('setuptools')
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193 yield
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194
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195
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196 _MODULES_TO_HIDE = {
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197 'setuptools',
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198 'distutils',
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199 'pkg_resources',
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200 'Cython',
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201 '_distutils_hack',
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202 }
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203
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204
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205 def _needs_hiding(mod_name):
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206 """
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207 >>> _needs_hiding('setuptools')
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208 True
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209 >>> _needs_hiding('pkg_resources')
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210 True
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211 >>> _needs_hiding('setuptools_plugin')
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212 False
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213 >>> _needs_hiding('setuptools.__init__')
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214 True
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215 >>> _needs_hiding('distutils')
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216 True
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217 >>> _needs_hiding('os')
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218 False
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219 >>> _needs_hiding('Cython')
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220 True
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221 """
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222 base_module = mod_name.split('.', 1)[0]
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223 return base_module in _MODULES_TO_HIDE
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224
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225
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226 def hide_setuptools():
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227 """
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228 Remove references to setuptools' modules from sys.modules to allow the
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229 invocation to import the most appropriate setuptools. This technique is
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230 necessary to avoid issues such as #315 where setuptools upgrading itself
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231 would fail to find a function declared in the metadata.
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232 """
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233 _distutils_hack = sys.modules.get('_distutils_hack', None)
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234 if _distutils_hack is not None:
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235 _distutils_hack.remove_shim()
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236
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237 modules = filter(_needs_hiding, sys.modules)
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238 _clear_modules(modules)
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239
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240
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241 def run_setup(setup_script, args):
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242 """Run a distutils setup script, sandboxed in its directory"""
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243 setup_dir = os.path.abspath(os.path.dirname(setup_script))
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244 with setup_context(setup_dir):
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245 try:
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246 sys.argv[:] = [setup_script] + list(args)
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247 sys.path.insert(0, setup_dir)
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248 # reset to include setup dir, w/clean callback list
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249 working_set.__init__()
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250 working_set.callbacks.append(lambda dist: dist.activate())
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251
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252 with DirectorySandbox(setup_dir):
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253 ns = dict(__file__=setup_script, __name__='__main__')
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254 _execfile(setup_script, ns)
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255 except SystemExit as v:
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256 if v.args and v.args[0]:
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257 raise
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258 # Normal exit, just return
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259
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260
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261 class AbstractSandbox:
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262 """Wrap 'os' module and 'open()' builtin for virtualizing setup scripts"""
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263
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264 _active = False
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265
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266 def __init__(self):
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267 self._attrs = [
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268 name for name in dir(_os)
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269 if not name.startswith('_') and hasattr(self, name)
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270 ]
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271
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272 def _copy(self, source):
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273 for name in self._attrs:
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274 setattr(os, name, getattr(source, name))
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275
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276 def __enter__(self):
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277 self._copy(self)
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278 if _file:
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279 builtins.file = self._file
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280 builtins.open = self._open
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281 self._active = True
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282
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283 def __exit__(self, exc_type, exc_value, traceback):
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284 self._active = False
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285 if _file:
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286 builtins.file = _file
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287 builtins.open = _open
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288 self._copy(_os)
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289
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290 def run(self, func):
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291 """Run 'func' under os sandboxing"""
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292 with self:
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293 return func()
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294
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295 def _mk_dual_path_wrapper(name):
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296 original = getattr(_os, name)
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297
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298 def wrap(self, src, dst, *args, **kw):
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299 if self._active:
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300 src, dst = self._remap_pair(name, src, dst, *args, **kw)
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301 return original(src, dst, *args, **kw)
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302
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303 return wrap
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304
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305 for name in ["rename", "link", "symlink"]:
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306 if hasattr(_os, name):
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307 locals()[name] = _mk_dual_path_wrapper(name)
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308
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309 def _mk_single_path_wrapper(name, original=None):
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310 original = original or getattr(_os, name)
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311
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312 def wrap(self, path, *args, **kw):
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313 if self._active:
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314 path = self._remap_input(name, path, *args, **kw)
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315 return original(path, *args, **kw)
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316
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317 return wrap
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318
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319 if _file:
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320 _file = _mk_single_path_wrapper('file', _file)
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321 _open = _mk_single_path_wrapper('open', _open)
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322 for name in [
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323 "stat", "listdir", "chdir", "open", "chmod", "chown", "mkdir",
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324 "remove", "unlink", "rmdir", "utime", "lchown", "chroot", "lstat",
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325 "startfile", "mkfifo", "mknod", "pathconf", "access"
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326 ]:
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327 if hasattr(_os, name):
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328 locals()[name] = _mk_single_path_wrapper(name)
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329
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330 def _mk_single_with_return(name):
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331 original = getattr(_os, name)
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332
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333 def wrap(self, path, *args, **kw):
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334 if self._active:
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335 path = self._remap_input(name, path, *args, **kw)
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336 return self._remap_output(name, original(path, *args, **kw))
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337 return original(path, *args, **kw)
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338
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339 return wrap
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340
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341 for name in ['readlink', 'tempnam']:
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342 if hasattr(_os, name):
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343 locals()[name] = _mk_single_with_return(name)
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344
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345 def _mk_query(name):
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346 original = getattr(_os, name)
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347
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348 def wrap(self, *args, **kw):
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349 retval = original(*args, **kw)
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350 if self._active:
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351 return self._remap_output(name, retval)
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352 return retval
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353
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354 return wrap
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355
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356 for name in ['getcwd', 'tmpnam']:
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357 if hasattr(_os, name):
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358 locals()[name] = _mk_query(name)
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359
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360 def _validate_path(self, path):
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361 """Called to remap or validate any path, whether input or output"""
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362 return path
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363
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364 def _remap_input(self, operation, path, *args, **kw):
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365 """Called for path inputs"""
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366 return self._validate_path(path)
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367
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368 def _remap_output(self, operation, path):
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369 """Called for path outputs"""
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370 return self._validate_path(path)
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371
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372 def _remap_pair(self, operation, src, dst, *args, **kw):
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373 """Called for path pairs like rename, link, and symlink operations"""
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374 return (
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375 self._remap_input(operation + '-from', src, *args, **kw),
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376 self._remap_input(operation + '-to', dst, *args, **kw)
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377 )
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378
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379
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380 if hasattr(os, 'devnull'):
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381 _EXCEPTIONS = [os.devnull]
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382 else:
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383 _EXCEPTIONS = []
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384
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385
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386 class DirectorySandbox(AbstractSandbox):
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387 """Restrict operations to a single subdirectory - pseudo-chroot"""
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388
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389 write_ops = dict.fromkeys([
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390 "open", "chmod", "chown", "mkdir", "remove", "unlink", "rmdir",
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391 "utime", "lchown", "chroot", "mkfifo", "mknod", "tempnam",
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392 ])
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393
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394 _exception_patterns = [
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395 # Allow lib2to3 to attempt to save a pickled grammar object (#121)
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396 r'.*lib2to3.*\.pickle$',
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397 ]
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398 "exempt writing to paths that match the pattern"
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399
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400 def __init__(self, sandbox, exceptions=_EXCEPTIONS):
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401 self._sandbox = os.path.normcase(os.path.realpath(sandbox))
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402 self._prefix = os.path.join(self._sandbox, '')
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403 self._exceptions = [
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404 os.path.normcase(os.path.realpath(path))
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405 for path in exceptions
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406 ]
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407 AbstractSandbox.__init__(self)
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408
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409 def _violation(self, operation, *args, **kw):
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410 from setuptools.sandbox import SandboxViolation
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411 raise SandboxViolation(operation, args, kw)
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412
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413 if _file:
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414
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415 def _file(self, path, mode='r', *args, **kw):
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416 if mode not in ('r', 'rt', 'rb', 'rU', 'U') and not self._ok(path):
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417 self._violation("file", path, mode, *args, **kw)
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418 return _file(path, mode, *args, **kw)
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419
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420 def _open(self, path, mode='r', *args, **kw):
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421 if mode not in ('r', 'rt', 'rb', 'rU', 'U') and not self._ok(path):
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422 self._violation("open", path, mode, *args, **kw)
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423 return _open(path, mode, *args, **kw)
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424
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425 def tmpnam(self):
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426 self._violation("tmpnam")
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427
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428 def _ok(self, path):
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429 active = self._active
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430 try:
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431 self._active = False
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432 realpath = os.path.normcase(os.path.realpath(path))
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433 return (
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434 self._exempted(realpath)
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435 or realpath == self._sandbox
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436 or realpath.startswith(self._prefix)
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437 )
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438 finally:
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439 self._active = active
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440
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441 def _exempted(self, filepath):
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442 start_matches = (
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443 filepath.startswith(exception)
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444 for exception in self._exceptions
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445 )
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446 pattern_matches = (
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447 re.match(pattern, filepath)
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448 for pattern in self._exception_patterns
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449 )
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450 candidates = itertools.chain(start_matches, pattern_matches)
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451 return any(candidates)
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452
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453 def _remap_input(self, operation, path, *args, **kw):
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454 """Called for path inputs"""
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455 if operation in self.write_ops and not self._ok(path):
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456 self._violation(operation, os.path.realpath(path), *args, **kw)
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457 return path
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458
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459 def _remap_pair(self, operation, src, dst, *args, **kw):
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460 """Called for path pairs like rename, link, and symlink operations"""
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461 if not self._ok(src) or not self._ok(dst):
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462 self._violation(operation, src, dst, *args, **kw)
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463 return (src, dst)
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464
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465 def open(self, file, flags, mode=0o777, *args, **kw):
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466 """Called for low-level os.open()"""
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467 if flags & WRITE_FLAGS and not self._ok(file):
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468 self._violation("os.open", file, flags, mode, *args, **kw)
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469 return _os.open(file, flags, mode, *args, **kw)
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470
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471
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472 WRITE_FLAGS = functools.reduce(
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473 operator.or_, [
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474 getattr(_os, a, 0) for a in
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475 "O_WRONLY O_RDWR O_APPEND O_CREAT O_TRUNC O_TEMPORARY".split()]
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476 )
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477
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478
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479 class SandboxViolation(DistutilsError):
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480 """A setup script attempted to modify the filesystem outside the sandbox"""
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481
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482 tmpl = textwrap.dedent("""
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483 SandboxViolation: {cmd}{args!r} {kwargs}
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484
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485 The package setup script has attempted to modify files on your system
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486 that are not within the EasyInstall build area, and has been aborted.
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487
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488 This package cannot be safely installed by EasyInstall, and may not
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489 support alternate installation locations even if you run its setup
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490 script by hand. Please inform the package's author and the EasyInstall
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491 maintainers to find out if a fix or workaround is available.
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492 """).lstrip()
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493
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494 def __str__(self):
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495 cmd, args, kwargs = self.args
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496 return self.tmpl.format(**locals())