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annotate lib/python3.8/site-packages/setuptools/sandbox.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 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
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12 from setuptools.extern import six
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13 from setuptools.extern.six.moves import builtins, map
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14
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15 import pkg_resources.py31compat
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16 from distutils.errors import DistutilsError
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17 from pkg_resources import working_set
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18
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19 if sys.platform.startswith('java'):
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20 import org.python.modules.posix.PosixModule as _os
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21 else:
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22 _os = sys.modules[os.name]
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23 try:
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24 _file = file
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25 except NameError:
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26 _file = None
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27 _open = open
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28
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29
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30 __all__ = [
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31 "AbstractSandbox", "DirectorySandbox", "SandboxViolation", "run_setup",
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32 ]
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33
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34
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35 def _execfile(filename, globals, locals=None):
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36 """
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37 Python 3 implementation of execfile.
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38 """
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39 mode = 'rb'
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40 with open(filename, mode) as stream:
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41 script = stream.read()
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42 if locals is None:
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43 locals = globals
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44 code = compile(script, filename, 'exec')
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45 exec(code, globals, locals)
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46
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47
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48 @contextlib.contextmanager
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49 def save_argv(repl=None):
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50 saved = sys.argv[:]
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51 if repl is not None:
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52 sys.argv[:] = repl
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53 try:
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54 yield saved
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55 finally:
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56 sys.argv[:] = saved
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57
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58
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59 @contextlib.contextmanager
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60 def save_path():
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61 saved = sys.path[:]
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62 try:
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63 yield saved
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64 finally:
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65 sys.path[:] = saved
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66
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67
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68 @contextlib.contextmanager
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69 def override_temp(replacement):
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70 """
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71 Monkey-patch tempfile.tempdir with replacement, ensuring it exists
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72 """
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73 pkg_resources.py31compat.makedirs(replacement, exist_ok=True)
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74
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75 saved = tempfile.tempdir
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76
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77 tempfile.tempdir = replacement
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78
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79 try:
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80 yield
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81 finally:
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82 tempfile.tempdir = saved
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83
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84
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85 @contextlib.contextmanager
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86 def pushd(target):
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87 saved = os.getcwd()
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88 os.chdir(target)
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89 try:
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90 yield saved
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91 finally:
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92 os.chdir(saved)
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93
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94
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95 class UnpickleableException(Exception):
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96 """
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97 An exception representing another Exception that could not be pickled.
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98 """
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99
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100 @staticmethod
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101 def dump(type, exc):
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102 """
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103 Always return a dumped (pickled) type and exc. If exc can't be pickled,
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104 wrap it in UnpickleableException first.
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105 """
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106 try:
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107 return pickle.dumps(type), pickle.dumps(exc)
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108 except Exception:
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109 # get UnpickleableException inside the sandbox
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110 from setuptools.sandbox import UnpickleableException as cls
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111 return cls.dump(cls, cls(repr(exc)))
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112
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113
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114 class ExceptionSaver:
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115 """
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116 A Context Manager that will save an exception, serialized, and restore it
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117 later.
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118 """
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119
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120 def __enter__(self):
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121 return self
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122
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123 def __exit__(self, type, exc, tb):
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124 if not exc:
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125 return
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126
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127 # dump the exception
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128 self._saved = UnpickleableException.dump(type, exc)
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129 self._tb = tb
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130
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131 # suppress the exception
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132 return True
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133
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134 def resume(self):
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135 "restore and re-raise any exception"
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136
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137 if '_saved' not in vars(self):
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138 return
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139
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140 type, exc = map(pickle.loads, self._saved)
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141 six.reraise(type, exc, self._tb)
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142
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143
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144 @contextlib.contextmanager
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145 def save_modules():
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146 """
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147 Context in which imported modules are saved.
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148
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149 Translates exceptions internal to the context into the equivalent exception
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150 outside the context.
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151 """
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152 saved = sys.modules.copy()
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153 with ExceptionSaver() as saved_exc:
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154 yield saved
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155
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156 sys.modules.update(saved)
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157 # remove any modules imported since
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158 del_modules = (
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159 mod_name for mod_name in sys.modules
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160 if mod_name not in saved
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161 # exclude any encodings modules. See #285
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162 and not mod_name.startswith('encodings.')
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163 )
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164 _clear_modules(del_modules)
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165
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166 saved_exc.resume()
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167
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168
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169 def _clear_modules(module_names):
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170 for mod_name in list(module_names):
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171 del sys.modules[mod_name]
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172
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173
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174 @contextlib.contextmanager
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175 def save_pkg_resources_state():
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176 saved = pkg_resources.__getstate__()
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177 try:
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178 yield saved
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179 finally:
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180 pkg_resources.__setstate__(saved)
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181
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182
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183 @contextlib.contextmanager
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184 def setup_context(setup_dir):
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185 temp_dir = os.path.join(setup_dir, 'temp')
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186 with save_pkg_resources_state():
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187 with save_modules():
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188 hide_setuptools()
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189 with save_path():
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190 with save_argv():
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191 with override_temp(temp_dir):
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192 with pushd(setup_dir):
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193 # ensure setuptools commands are available
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194 __import__('setuptools')
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195 yield
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196
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197
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198 def _needs_hiding(mod_name):
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199 """
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200 >>> _needs_hiding('setuptools')
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201 True
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202 >>> _needs_hiding('pkg_resources')
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203 True
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204 >>> _needs_hiding('setuptools_plugin')
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205 False
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206 >>> _needs_hiding('setuptools.__init__')
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207 True
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208 >>> _needs_hiding('distutils')
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209 True
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210 >>> _needs_hiding('os')
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211 False
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212 >>> _needs_hiding('Cython')
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213 True
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214 """
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215 pattern = re.compile(r'(setuptools|pkg_resources|distutils|Cython)(\.|$)')
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216 return bool(pattern.match(mod_name))
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217
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218
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219 def hide_setuptools():
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220 """
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221 Remove references to setuptools' modules from sys.modules to allow the
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222 invocation to import the most appropriate setuptools. This technique is
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223 necessary to avoid issues such as #315 where setuptools upgrading itself
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224 would fail to find a function declared in the metadata.
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225 """
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226 modules = filter(_needs_hiding, sys.modules)
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227 _clear_modules(modules)
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228
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229
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230 def run_setup(setup_script, args):
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231 """Run a distutils setup script, sandboxed in its directory"""
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232 setup_dir = os.path.abspath(os.path.dirname(setup_script))
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233 with setup_context(setup_dir):
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234 try:
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235 sys.argv[:] = [setup_script] + list(args)
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236 sys.path.insert(0, setup_dir)
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237 # reset to include setup dir, w/clean callback list
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238 working_set.__init__()
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239 working_set.callbacks.append(lambda dist: dist.activate())
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240
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241 # __file__ should be a byte string on Python 2 (#712)
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242 dunder_file = (
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243 setup_script
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244 if isinstance(setup_script, str) else
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245 setup_script.encode(sys.getfilesystemencoding())
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246 )
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247
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248 with DirectorySandbox(setup_dir):
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249 ns = dict(__file__=dunder_file, __name__='__main__')
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250 _execfile(setup_script, ns)
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251 except SystemExit as v:
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252 if v.args and v.args[0]:
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253 raise
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254 # Normal exit, just return
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255
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256
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257 class AbstractSandbox:
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258 """Wrap 'os' module and 'open()' builtin for virtualizing setup scripts"""
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259
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260 _active = False
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261
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262 def __init__(self):
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263 self._attrs = [
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264 name for name in dir(_os)
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265 if not name.startswith('_') and hasattr(self, name)
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266 ]
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267
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268 def _copy(self, source):
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269 for name in self._attrs:
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270 setattr(os, name, getattr(source, name))
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271
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272 def __enter__(self):
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273 self._copy(self)
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274 if _file:
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275 builtins.file = self._file
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276 builtins.open = self._open
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277 self._active = True
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278
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279 def __exit__(self, exc_type, exc_value, traceback):
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280 self._active = False
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281 if _file:
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282 builtins.file = _file
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283 builtins.open = _open
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284 self._copy(_os)
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285
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286 def run(self, func):
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287 """Run 'func' under os sandboxing"""
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288 with self:
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289 return func()
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290
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291 def _mk_dual_path_wrapper(name):
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292 original = getattr(_os, name)
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293
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294 def wrap(self, src, dst, *args, **kw):
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295 if self._active:
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296 src, dst = self._remap_pair(name, src, dst, *args, **kw)
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297 return original(src, dst, *args, **kw)
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298
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299 return wrap
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300
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301 for name in ["rename", "link", "symlink"]:
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302 if hasattr(_os, name):
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303 locals()[name] = _mk_dual_path_wrapper(name)
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304
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305 def _mk_single_path_wrapper(name, original=None):
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306 original = original or getattr(_os, name)
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307
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308 def wrap(self, path, *args, **kw):
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309 if self._active:
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310 path = self._remap_input(name, path, *args, **kw)
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311 return original(path, *args, **kw)
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312
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313 return wrap
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314
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315 if _file:
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316 _file = _mk_single_path_wrapper('file', _file)
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317 _open = _mk_single_path_wrapper('open', _open)
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318 for name in [
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319 "stat", "listdir", "chdir", "open", "chmod", "chown", "mkdir",
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320 "remove", "unlink", "rmdir", "utime", "lchown", "chroot", "lstat",
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321 "startfile", "mkfifo", "mknod", "pathconf", "access"
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322 ]:
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323 if hasattr(_os, name):
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324 locals()[name] = _mk_single_path_wrapper(name)
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325
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326 def _mk_single_with_return(name):
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327 original = getattr(_os, name)
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328
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329 def wrap(self, path, *args, **kw):
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330 if self._active:
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331 path = self._remap_input(name, path, *args, **kw)
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332 return self._remap_output(name, original(path, *args, **kw))
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333 return original(path, *args, **kw)
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334
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335 return wrap
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336
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337 for name in ['readlink', 'tempnam']:
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338 if hasattr(_os, name):
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339 locals()[name] = _mk_single_with_return(name)
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340
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341 def _mk_query(name):
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342 original = getattr(_os, name)
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343
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344 def wrap(self, *args, **kw):
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345 retval = original(*args, **kw)
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346 if self._active:
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347 return self._remap_output(name, retval)
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348 return retval
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349
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350 return wrap
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351
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352 for name in ['getcwd', 'tmpnam']:
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353 if hasattr(_os, name):
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354 locals()[name] = _mk_query(name)
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355
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356 def _validate_path(self, path):
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357 """Called to remap or validate any path, whether input or output"""
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358 return path
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359
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360 def _remap_input(self, operation, path, *args, **kw):
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361 """Called for path inputs"""
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362 return self._validate_path(path)
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363
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364 def _remap_output(self, operation, path):
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365 """Called for path outputs"""
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366 return self._validate_path(path)
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367
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368 def _remap_pair(self, operation, src, dst, *args, **kw):
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369 """Called for path pairs like rename, link, and symlink operations"""
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370 return (
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371 self._remap_input(operation + '-from', src, *args, **kw),
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372 self._remap_input(operation + '-to', dst, *args, **kw)
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373 )
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374
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375
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376 if hasattr(os, 'devnull'):
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377 _EXCEPTIONS = [os.devnull]
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378 else:
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379 _EXCEPTIONS = []
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380
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381
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382 class DirectorySandbox(AbstractSandbox):
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383 """Restrict operations to a single subdirectory - pseudo-chroot"""
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384
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385 write_ops = dict.fromkeys([
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386 "open", "chmod", "chown", "mkdir", "remove", "unlink", "rmdir",
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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387 "utime", "lchown", "chroot", "mkfifo", "mknod", "tempnam",
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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388 ])
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389
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390 _exception_patterns = [
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391 # Allow lib2to3 to attempt to save a pickled grammar object (#121)
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392 r'.*lib2to3.*\.pickle$',
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393 ]
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394 "exempt writing to paths that match the pattern"
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395
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396 def __init__(self, sandbox, exceptions=_EXCEPTIONS):
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397 self._sandbox = os.path.normcase(os.path.realpath(sandbox))
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398 self._prefix = os.path.join(self._sandbox, '')
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399 self._exceptions = [
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400 os.path.normcase(os.path.realpath(path))
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401 for path in exceptions
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402 ]
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403 AbstractSandbox.__init__(self)
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404
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405 def _violation(self, operation, *args, **kw):
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406 from setuptools.sandbox import SandboxViolation
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407 raise SandboxViolation(operation, args, kw)
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408
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409 if _file:
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410
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411 def _file(self, path, mode='r', *args, **kw):
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412 if mode not in ('r', 'rt', 'rb', 'rU', 'U') and not self._ok(path):
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413 self._violation("file", path, mode, *args, **kw)
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414 return _file(path, mode, *args, **kw)
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415
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416 def _open(self, path, mode='r', *args, **kw):
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417 if mode not in ('r', 'rt', 'rb', 'rU', 'U') and not self._ok(path):
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418 self._violation("open", path, mode, *args, **kw)
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419 return _open(path, mode, *args, **kw)
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420
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421 def tmpnam(self):
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422 self._violation("tmpnam")
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423
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424 def _ok(self, path):
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425 active = self._active
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426 try:
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427 self._active = False
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428 realpath = os.path.normcase(os.path.realpath(path))
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429 return (
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430 self._exempted(realpath)
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431 or realpath == self._sandbox
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432 or realpath.startswith(self._prefix)
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433 )
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434 finally:
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435 self._active = active
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436
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437 def _exempted(self, filepath):
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438 start_matches = (
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439 filepath.startswith(exception)
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440 for exception in self._exceptions
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441 )
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442 pattern_matches = (
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443 re.match(pattern, filepath)
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444 for pattern in self._exception_patterns
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445 )
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446 candidates = itertools.chain(start_matches, pattern_matches)
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447 return any(candidates)
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448
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449 def _remap_input(self, operation, path, *args, **kw):
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450 """Called for path inputs"""
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451 if operation in self.write_ops and not self._ok(path):
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452 self._violation(operation, os.path.realpath(path), *args, **kw)
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453 return path
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454
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455 def _remap_pair(self, operation, src, dst, *args, **kw):
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456 """Called for path pairs like rename, link, and symlink operations"""
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457 if not self._ok(src) or not self._ok(dst):
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458 self._violation(operation, src, dst, *args, **kw)
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459 return (src, dst)
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460
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461 def open(self, file, flags, mode=0o777, *args, **kw):
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462 """Called for low-level os.open()"""
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463 if flags & WRITE_FLAGS and not self._ok(file):
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464 self._violation("os.open", file, flags, mode, *args, **kw)
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465 return _os.open(file, flags, mode, *args, **kw)
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466
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467
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468 WRITE_FLAGS = functools.reduce(
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469 operator.or_, [
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470 getattr(_os, a, 0) for a in
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471 "O_WRONLY O_RDWR O_APPEND O_CREAT O_TRUNC O_TEMPORARY".split()]
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472 )
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473
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474
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475 class SandboxViolation(DistutilsError):
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476 """A setup script attempted to modify the filesystem outside the sandbox"""
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477
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478 tmpl = textwrap.dedent("""
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479 SandboxViolation: {cmd}{args!r} {kwargs}
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480
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481 The package setup script has attempted to modify files on your system
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482 that are not within the EasyInstall build area, and has been aborted.
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483
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484 This package cannot be safely installed by EasyInstall, and may not
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485 support alternate installation locations even if you run its setup
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486 script by hand. Please inform the package's author and the EasyInstall
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487 maintainers to find out if a fix or workaround is available.
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488 """).lstrip()
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489
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490 def __str__(self):
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491 cmd, args, kwargs = self.args
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492 return self.tmpl.format(**locals())