Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/setuptools/sandbox.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -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
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11 import pkg_resources
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12
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13 if os.name == "java":
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14 import org.python.modules.posix.PosixModule as _os
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15 else:
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16 _os = sys.modules[os.name]
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17 try:
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18 _file = file
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19 except NameError:
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20 _file = None
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21 _open = open
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22 from distutils.errors import DistutilsError
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23 from pkg_resources import working_set
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24
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25 from setuptools import compat
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26 from setuptools.compat import builtins
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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 def _execfile(filename, globals, locals=None):
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33 """
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34 Python 3 implementation of execfile.
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35 """
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36 mode = 'rb'
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37 # Python 2.6 compile requires LF for newlines, so use deprecated
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38 # Universal newlines support.
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39 if sys.version_info < (2, 7):
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40 mode += 'U'
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41 with open(filename, mode) as stream:
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42 script = stream.read()
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43 if locals is None:
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44 locals = globals
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45 code = compile(script, filename, 'exec')
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46 exec(code, globals, locals)
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47
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48
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49 @contextlib.contextmanager
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50 def save_argv(repl=None):
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51 saved = sys.argv[:]
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52 if repl is not None:
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53 sys.argv[:] = repl
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54 try:
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55 yield saved
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56 finally:
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57 sys.argv[:] = saved
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58
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59
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60 @contextlib.contextmanager
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61 def save_path():
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62 saved = sys.path[:]
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63 try:
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64 yield saved
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65 finally:
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66 sys.path[:] = saved
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67
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68
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69 @contextlib.contextmanager
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70 def override_temp(replacement):
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71 """
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72 Monkey-patch tempfile.tempdir with replacement, ensuring it exists
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73 """
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74 if not os.path.isdir(replacement):
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75 os.makedirs(replacement)
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76
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77 saved = tempfile.tempdir
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78
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79 tempfile.tempdir = replacement
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80
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81 try:
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82 yield
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83 finally:
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84 tempfile.tempdir = saved
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85
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86
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87 @contextlib.contextmanager
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88 def pushd(target):
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89 saved = os.getcwd()
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90 os.chdir(target)
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91 try:
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92 yield saved
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93 finally:
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94 os.chdir(saved)
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95
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96
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97 class UnpickleableException(Exception):
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98 """
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99 An exception representing another Exception that could not be pickled.
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100 """
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101 @classmethod
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102 def dump(cls, type, exc):
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103 """
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104 Always return a dumped (pickled) type and exc. If exc can't be pickled,
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105 wrap it in UnpickleableException first.
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106 """
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107 try:
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108 return pickle.dumps(type), pickle.dumps(exc)
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109 except Exception:
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110 return cls.dump(cls, cls(repr(exc)))
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111
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112
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113 class ExceptionSaver:
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114 """
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115 A Context Manager that will save an exception, serialized, and restore it
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116 later.
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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 compat.reraise(type, exc, 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 hide_setuptools()
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187 with save_path():
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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 def _needs_hiding(mod_name):
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197 """
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198 >>> _needs_hiding('setuptools')
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199 True
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200 >>> _needs_hiding('pkg_resources')
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201 True
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202 >>> _needs_hiding('setuptools_plugin')
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203 False
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204 >>> _needs_hiding('setuptools.__init__')
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205 True
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206 >>> _needs_hiding('distutils')
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207 True
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208 """
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209 pattern = re.compile('(setuptools|pkg_resources|distutils)(\.|$)')
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210 return bool(pattern.match(mod_name))
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211
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212
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213 def hide_setuptools():
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214 """
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215 Remove references to setuptools' modules from sys.modules to allow the
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216 invocation to import the most appropriate setuptools. This technique is
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217 necessary to avoid issues such as #315 where setuptools upgrading itself
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218 would fail to find a function declared in the metadata.
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219 """
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220 modules = filter(_needs_hiding, sys.modules)
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221 _clear_modules(modules)
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222
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223
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224 def run_setup(setup_script, args):
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225 """Run a distutils setup script, sandboxed in its directory"""
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226 setup_dir = os.path.abspath(os.path.dirname(setup_script))
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227 with setup_context(setup_dir):
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228 try:
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229 sys.argv[:] = [setup_script]+list(args)
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230 sys.path.insert(0, setup_dir)
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231 # reset to include setup dir, w/clean callback list
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232 working_set.__init__()
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233 working_set.callbacks.append(lambda dist:dist.activate())
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234 def runner():
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235 ns = dict(__file__=setup_script, __name__='__main__')
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236 _execfile(setup_script, ns)
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237 DirectorySandbox(setup_dir).run(runner)
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238 except SystemExit as v:
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239 if v.args and v.args[0]:
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240 raise
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241 # Normal exit, just return
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242
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243
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244 class AbstractSandbox:
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245 """Wrap 'os' module and 'open()' builtin for virtualizing setup scripts"""
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246
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247 _active = False
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248
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249 def __init__(self):
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250 self._attrs = [
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251 name for name in dir(_os)
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252 if not name.startswith('_') and hasattr(self,name)
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253 ]
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254
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255 def _copy(self, source):
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256 for name in self._attrs:
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257 setattr(os, name, getattr(source,name))
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258
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259 def run(self, func):
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260 """Run 'func' under os sandboxing"""
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261 try:
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262 self._copy(self)
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263 if _file:
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264 builtins.file = self._file
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265 builtins.open = self._open
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266 self._active = True
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267 return func()
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268 finally:
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269 self._active = False
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270 if _file:
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271 builtins.file = _file
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272 builtins.open = _open
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273 self._copy(_os)
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274
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275 def _mk_dual_path_wrapper(name):
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276 original = getattr(_os,name)
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277 def wrap(self,src,dst,*args,**kw):
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278 if self._active:
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279 src,dst = self._remap_pair(name,src,dst,*args,**kw)
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280 return original(src,dst,*args,**kw)
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281 return wrap
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282
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283 for name in ["rename", "link", "symlink"]:
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284 if hasattr(_os,name): locals()[name] = _mk_dual_path_wrapper(name)
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285
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286 def _mk_single_path_wrapper(name, original=None):
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287 original = original or getattr(_os,name)
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288 def wrap(self,path,*args,**kw):
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289 if self._active:
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290 path = self._remap_input(name,path,*args,**kw)
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291 return original(path,*args,**kw)
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292 return wrap
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293
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294 if _file:
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295 _file = _mk_single_path_wrapper('file', _file)
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296 _open = _mk_single_path_wrapper('open', _open)
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297 for name in [
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298 "stat", "listdir", "chdir", "open", "chmod", "chown", "mkdir",
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299 "remove", "unlink", "rmdir", "utime", "lchown", "chroot", "lstat",
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300 "startfile", "mkfifo", "mknod", "pathconf", "access"
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301 ]:
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302 if hasattr(_os,name): locals()[name] = _mk_single_path_wrapper(name)
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303
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304 def _mk_single_with_return(name):
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305 original = getattr(_os,name)
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306 def wrap(self,path,*args,**kw):
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307 if self._active:
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308 path = self._remap_input(name,path,*args,**kw)
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309 return self._remap_output(name, original(path,*args,**kw))
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310 return original(path,*args,**kw)
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311 return wrap
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312
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313 for name in ['readlink', 'tempnam']:
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314 if hasattr(_os,name): locals()[name] = _mk_single_with_return(name)
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315
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316 def _mk_query(name):
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317 original = getattr(_os,name)
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318 def wrap(self,*args,**kw):
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319 retval = original(*args,**kw)
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320 if self._active:
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321 return self._remap_output(name, retval)
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322 return retval
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323 return wrap
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324
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325 for name in ['getcwd', 'tmpnam']:
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326 if hasattr(_os,name): locals()[name] = _mk_query(name)
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327
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328 def _validate_path(self,path):
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329 """Called to remap or validate any path, whether input or output"""
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330 return path
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331
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332 def _remap_input(self,operation,path,*args,**kw):
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333 """Called for path inputs"""
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334 return self._validate_path(path)
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335
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336 def _remap_output(self,operation,path):
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337 """Called for path outputs"""
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338 return self._validate_path(path)
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339
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340 def _remap_pair(self,operation,src,dst,*args,**kw):
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341 """Called for path pairs like rename, link, and symlink operations"""
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342 return (
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343 self._remap_input(operation+'-from',src,*args,**kw),
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344 self._remap_input(operation+'-to',dst,*args,**kw)
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345 )
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346
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347
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348 if hasattr(os, 'devnull'):
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349 _EXCEPTIONS = [os.devnull,]
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350 else:
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351 _EXCEPTIONS = []
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352
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353 try:
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354 from win32com.client.gencache import GetGeneratePath
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355 _EXCEPTIONS.append(GetGeneratePath())
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356 del GetGeneratePath
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357 except ImportError:
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358 # it appears pywin32 is not installed, so no need to exclude.
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359 pass
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360
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361 class DirectorySandbox(AbstractSandbox):
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362 """Restrict operations to a single subdirectory - pseudo-chroot"""
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363
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364 write_ops = dict.fromkeys([
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365 "open", "chmod", "chown", "mkdir", "remove", "unlink", "rmdir",
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366 "utime", "lchown", "chroot", "mkfifo", "mknod", "tempnam",
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367 ])
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368
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369 _exception_patterns = [
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370 # Allow lib2to3 to attempt to save a pickled grammar object (#121)
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371 '.*lib2to3.*\.pickle$',
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372 ]
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373 "exempt writing to paths that match the pattern"
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374
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375 def __init__(self, sandbox, exceptions=_EXCEPTIONS):
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376 self._sandbox = os.path.normcase(os.path.realpath(sandbox))
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377 self._prefix = os.path.join(self._sandbox,'')
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378 self._exceptions = [
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379 os.path.normcase(os.path.realpath(path))
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380 for path in exceptions
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381 ]
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382 AbstractSandbox.__init__(self)
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383
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384 def _violation(self, operation, *args, **kw):
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385 raise SandboxViolation(operation, args, kw)
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386
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387 if _file:
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388 def _file(self, path, mode='r', *args, **kw):
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389 if mode not in ('r', 'rt', 'rb', 'rU', 'U') and not self._ok(path):
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390 self._violation("file", path, mode, *args, **kw)
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391 return _file(path,mode,*args,**kw)
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392
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393 def _open(self, path, mode='r', *args, **kw):
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394 if mode not in ('r', 'rt', 'rb', 'rU', 'U') and not self._ok(path):
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395 self._violation("open", path, mode, *args, **kw)
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396 return _open(path,mode,*args,**kw)
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397
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398 def tmpnam(self):
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399 self._violation("tmpnam")
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400
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401 def _ok(self, path):
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402 active = self._active
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403 try:
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404 self._active = False
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405 realpath = os.path.normcase(os.path.realpath(path))
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406 return (
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407 self._exempted(realpath)
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408 or realpath == self._sandbox
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409 or realpath.startswith(self._prefix)
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410 )
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411 finally:
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412 self._active = active
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413
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414 def _exempted(self, filepath):
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415 start_matches = (
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416 filepath.startswith(exception)
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417 for exception in self._exceptions
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418 )
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419 pattern_matches = (
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420 re.match(pattern, filepath)
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421 for pattern in self._exception_patterns
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422 )
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423 candidates = itertools.chain(start_matches, pattern_matches)
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424 return any(candidates)
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425
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426 def _remap_input(self, operation, path, *args, **kw):
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427 """Called for path inputs"""
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428 if operation in self.write_ops and not self._ok(path):
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429 self._violation(operation, os.path.realpath(path), *args, **kw)
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430 return path
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431
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432 def _remap_pair(self, operation, src, dst, *args, **kw):
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433 """Called for path pairs like rename, link, and symlink operations"""
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434 if not self._ok(src) or not self._ok(dst):
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435 self._violation(operation, src, dst, *args, **kw)
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436 return (src,dst)
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437
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438 def open(self, file, flags, mode=0o777, *args, **kw):
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439 """Called for low-level os.open()"""
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440 if flags & WRITE_FLAGS and not self._ok(file):
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441 self._violation("os.open", file, flags, mode, *args, **kw)
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442 return _os.open(file,flags,mode, *args, **kw)
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443
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444 WRITE_FLAGS = functools.reduce(
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445 operator.or_, [getattr(_os, a, 0) for a in
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446 "O_WRONLY O_RDWR O_APPEND O_CREAT O_TRUNC O_TEMPORARY".split()]
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447 )
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448
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449 class SandboxViolation(DistutilsError):
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450 """A setup script attempted to modify the filesystem outside the sandbox"""
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451
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452 def __str__(self):
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453 return """SandboxViolation: %s%r %s
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454
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455 The package setup script has attempted to modify files on your system
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456 that are not within the EasyInstall build area, and has been aborted.
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457
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458 This package cannot be safely installed by EasyInstall, and may not
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459 support alternate installation locations even if you run its setup
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460 script by hand. Please inform the package's author and the EasyInstall
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461 maintainers to find out if a fix or workaround is available.""" % self.args
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462
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463
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464
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465
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466
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467
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468
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469
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470
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471
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472
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473
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474
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475
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476
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477
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478
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479
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480
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481
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482
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483
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484
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485
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486
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487
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488
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489 #