1 | """Append module search paths for third-party packages to sys.path.
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2 |
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3 | ****************************************************************
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4 | * This module is automatically imported during initialization. *
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5 | ****************************************************************
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6 |
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7 | In earlier versions of Python (up to 1.5a3), scripts or modules that
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8 | needed to use site-specific modules would place ``import site''
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9 | somewhere near the top of their code. Because of the automatic
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10 | import, this is no longer necessary (but code that does it still
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11 | works).
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12 |
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13 | This will append site-specific paths to the module search path. On
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14 | Unix (including Mac OSX), it starts with sys.prefix and
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15 | sys.exec_prefix (if different) and appends
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16 | lib/python<version>/site-packages as well as lib/site-python.
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17 | On other platforms (such as Windows), it tries each of the
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18 | prefixes directly, as well as with lib/site-packages appended. The
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19 | resulting directories, if they exist, are appended to sys.path, and
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20 | also inspected for path configuration files.
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21 |
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22 | A path configuration file is a file whose name has the form
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23 | <package>.pth; its contents are additional directories (one per line)
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24 | to be added to sys.path. Non-existing directories (or
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25 | non-directories) are never added to sys.path; no directory is added to
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26 | sys.path more than once. Blank lines and lines beginning with
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27 | '#' are skipped. Lines starting with 'import' are executed.
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28 |
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29 | For example, suppose sys.prefix and sys.exec_prefix are set to
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30 | /usr/local and there is a directory /usr/local/lib/python2.5/site-packages
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31 | with three subdirectories, foo, bar and spam, and two path
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32 | configuration files, foo.pth and bar.pth. Assume foo.pth contains the
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33 | following:
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34 |
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35 | # foo package configuration
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36 | foo
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37 | bar
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38 | bletch
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39 |
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40 | and bar.pth contains:
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41 |
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42 | # bar package configuration
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43 | bar
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44 |
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45 | Then the following directories are added to sys.path, in this order:
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46 |
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47 | /usr/local/lib/python2.5/site-packages/bar
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48 | /usr/local/lib/python2.5/site-packages/foo
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49 |
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50 | Note that bletch is omitted because it doesn't exist; bar precedes foo
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51 | because bar.pth comes alphabetically before foo.pth; and spam is
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52 | omitted because it is not mentioned in either path configuration file.
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53 |
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54 | After these path manipulations, an attempt is made to import a module
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55 | named sitecustomize, which can perform arbitrary additional
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56 | site-specific customizations. If this import fails with an
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57 | ImportError exception, it is silently ignored.
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58 |
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59 | """
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60 |
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61 | import sys
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62 | import os
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63 | import __builtin__
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64 |
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65 | # Prefixes for site-packages; add additional prefixes like /usr/local here
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66 | PREFIXES = [sys.prefix, sys.exec_prefix]
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67 | # Enable per user site-packages directory
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68 | # set it to False to disable the feature or True to force the feature
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69 | ENABLE_USER_SITE = None
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70 | # for distutils.commands.install
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71 | USER_SITE = None
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72 | USER_BASE = None
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73 |
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74 |
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75 | def makepath(*paths):
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76 | dir = os.path.abspath(os.path.join(*paths))
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77 | return dir, os.path.normcase(dir)
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78 |
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79 |
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80 | def abs__file__():
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81 | """Set all module' __file__ attribute to an absolute path"""
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82 | for m in sys.modules.values():
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83 | if hasattr(m, '__loader__'):
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84 | continue # don't mess with a PEP 302-supplied __file__
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85 | try:
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86 | m.__file__ = os.path.abspath(m.__file__)
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87 | except AttributeError:
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88 | continue
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89 |
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90 |
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91 | def removeduppaths():
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92 | """ Remove duplicate entries from sys.path along with making them
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93 | absolute"""
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94 | # This ensures that the initial path provided by the interpreter contains
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95 | # only absolute pathnames, even if we're running from the build directory.
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96 | L = []
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97 | known_paths = set()
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98 | for dir in sys.path:
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99 | # Filter out duplicate paths (on case-insensitive file systems also
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100 | # if they only differ in case); turn relative paths into absolute
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101 | # paths.
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102 | dir, dircase = makepath(dir)
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103 | if not dircase in known_paths:
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104 | L.append(dir)
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105 | known_paths.add(dircase)
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106 | sys.path[:] = L
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107 | return known_paths
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108 |
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109 | # XXX This should not be part of site.py, since it is needed even when
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110 | # using the -S option for Python. See http://www.python.org/sf/586680
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111 | def addbuilddir():
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112 | """Append ./build/lib.<platform> in case we're running in the build dir
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113 | (especially for Guido :-)"""
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114 | from distutils.util import get_platform
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115 | s = "build/lib.%s-%.3s" % (get_platform(), sys.version)
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116 | if hasattr(sys, 'gettotalrefcount'):
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117 | s += '-pydebug'
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118 | s = os.path.join(os.path.dirname(sys.path[-1]), s)
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119 | sys.path.append(s)
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120 |
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121 |
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122 | def _init_pathinfo():
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123 | """Return a set containing all existing directory entries from sys.path"""
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124 | d = set()
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125 | for dir in sys.path:
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126 | try:
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127 | if os.path.isdir(dir):
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128 | dir, dircase = makepath(dir)
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129 | d.add(dircase)
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130 | except TypeError:
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131 | continue
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132 | return d
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133 |
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134 |
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135 | def addpackage(sitedir, name, known_paths):
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136 | """Process a .pth file within the site-packages directory:
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137 | For each line in the file, either combine it with sitedir to a path
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138 | and add that to known_paths, or execute it if it starts with 'import '.
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139 | """
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140 | if known_paths is None:
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141 | _init_pathinfo()
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142 | reset = 1
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143 | else:
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144 | reset = 0
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145 | fullname = os.path.join(sitedir, name)
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146 | try:
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147 | f = open(fullname, "rU")
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148 | except IOError:
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149 | return
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150 | with f:
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151 | for line in f:
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152 | if line.startswith("#"):
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153 | continue
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154 | if line.startswith(("import ", "import\t")):
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155 | exec line
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156 | continue
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157 | line = line.rstrip()
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158 | dir, dircase = makepath(sitedir, line)
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159 | if not dircase in known_paths and os.path.exists(dir):
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160 | sys.path.append(dir)
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161 | known_paths.add(dircase)
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162 | if reset:
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163 | known_paths = None
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164 | return known_paths
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165 |
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166 |
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167 | def addsitedir(sitedir, known_paths=None):
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168 | """Add 'sitedir' argument to sys.path if missing and handle .pth files in
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169 | 'sitedir'"""
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170 | if known_paths is None:
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171 | known_paths = _init_pathinfo()
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172 | reset = 1
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173 | else:
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174 | reset = 0
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175 | sitedir, sitedircase = makepath(sitedir)
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176 | if not sitedircase in known_paths:
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177 | sys.path.append(sitedir) # Add path component
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178 | try:
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179 | names = os.listdir(sitedir)
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180 | except os.error:
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181 | return
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182 | dotpth = os.extsep + "pth"
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183 | names = [name for name in names if name.endswith(dotpth)]
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184 | for name in sorted(names):
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185 | addpackage(sitedir, name, known_paths)
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186 | if reset:
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187 | known_paths = None
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188 | return known_paths
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189 |
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190 |
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191 | def check_enableusersite():
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192 | """Check if user site directory is safe for inclusion
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193 |
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194 | The function tests for the command line flag (including environment var),
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195 | process uid/gid equal to effective uid/gid.
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196 |
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197 | None: Disabled for security reasons
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198 | False: Disabled by user (command line option)
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199 | True: Safe and enabled
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200 | """
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201 | if sys.flags.no_user_site:
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202 | return False
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203 |
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204 | if hasattr(os, "getuid") and hasattr(os, "geteuid"):
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205 | # check process uid == effective uid
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206 | if os.geteuid() != os.getuid():
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207 | return None
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208 | if hasattr(os, "getgid") and hasattr(os, "getegid"):
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209 | # check process gid == effective gid
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210 | if os.getegid() != os.getgid():
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211 | return None
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212 |
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213 | return True
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214 |
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215 |
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216 | def addusersitepackages(known_paths):
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217 | """Add a per user site-package to sys.path
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218 |
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219 | Each user has its own python directory with site-packages in the
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220 | home directory.
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221 |
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222 | USER_BASE is the root directory for all Python versions
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223 |
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224 | USER_SITE is the user specific site-packages directory
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225 |
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226 | USER_SITE/.. can be used for data.
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227 | """
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228 | global USER_BASE, USER_SITE, ENABLE_USER_SITE
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229 | env_base = os.environ.get("PYTHONUSERBASE", None)
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230 |
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231 | def joinuser(*args):
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232 | return os.path.expanduser(os.path.join(*args))
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233 |
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234 | #if sys.platform in ('os2emx', 'os2knix', 'riscos'):
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235 | # # Don't know what to put here
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236 | # USER_BASE = ''
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237 | # USER_SITE = ''
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238 | if os.name == "nt":
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239 | base = os.environ.get("APPDATA") or "~"
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240 | USER_BASE = env_base if env_base else joinuser(base, "Python")
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241 | USER_SITE = os.path.join(USER_BASE,
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242 | "Python" + sys.version[0] + sys.version[2],
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243 | "site-packages")
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244 | else:
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245 | USER_BASE = env_base if env_base else joinuser("~", ".local")
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246 | USER_SITE = os.path.join(USER_BASE, "lib",
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247 | "python" + sys.version[:3],
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248 | "site-packages")
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249 |
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250 | if ENABLE_USER_SITE and os.path.isdir(USER_SITE):
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251 | addsitedir(USER_SITE, known_paths)
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252 | return known_paths
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253 |
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254 |
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255 | def addsitepackages(known_paths):
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256 | """Add site-packages (and possibly site-python) to sys.path"""
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257 | sitedirs = []
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258 | seen = []
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259 |
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260 | for prefix in PREFIXES:
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261 | if not prefix or prefix in seen:
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262 | continue
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263 | seen.append(prefix)
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264 |
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265 | if sys.platform in ('os2emx', 'os2knix', 'riscos'):
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266 | sitedirs.append(os.path.join(prefix, "Lib", "site-packages"))
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267 | elif os.sep == '/':
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268 | sitedirs.append(os.path.join(prefix, "lib",
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269 | "python" + sys.version[:3],
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270 | "site-packages"))
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271 | sitedirs.append(os.path.join(prefix, "lib", "site-python"))
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272 | else:
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273 | sitedirs.append(prefix)
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274 | sitedirs.append(os.path.join(prefix, "lib", "site-packages"))
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275 |
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276 | if sys.platform == "darwin":
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277 | # for framework builds *only* we add the standard Apple
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278 | # locations. Currently only per-user, but /Library and
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279 | # /Network/Library could be added too
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280 | if 'Python.framework' in prefix:
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281 | sitedirs.append(
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282 | os.path.expanduser(
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283 | os.path.join("~", "Library", "Python",
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284 | sys.version[:3], "site-packages")))
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285 |
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286 | for sitedir in sitedirs:
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287 | if os.path.isdir(sitedir):
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288 | addsitedir(sitedir, known_paths)
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289 |
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290 | return known_paths
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291 |
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292 |
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293 | def setBEGINLIBPATH():
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294 | """The OS/2 EMX port has optional extension modules that do double duty
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295 | as DLLs (and must use the .DLL file extension) for other extensions.
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296 | The library search path needs to be amended so these will be found
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297 | during module import. Use BEGINLIBPATH so that these are at the start
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298 | of the library search path.
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299 |
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300 | """
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301 | dllpath = os.path.join(sys.prefix, "Lib", "lib-dynload")
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302 | libpath = os.environ['BEGINLIBPATH'].split(';')
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303 | if libpath[-1]:
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304 | libpath.append(dllpath)
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305 | else:
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306 | libpath[-1] = dllpath
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307 | os.environ['BEGINLIBPATH'] = ';'.join(libpath)
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308 |
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309 |
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310 | def setquit():
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311 | """Define new built-ins 'quit' and 'exit'.
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312 | These are simply strings that display a hint on how to exit.
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313 |
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314 | """
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315 | if os.sep == ':':
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316 | eof = 'Cmd-Q'
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317 | elif os.sep == '\\':
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318 | eof = 'Ctrl-Z plus Return'
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319 | else:
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320 | eof = 'Ctrl-D (i.e. EOF)'
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321 |
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322 | class Quitter(object):
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323 | def __init__(self, name):
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324 | self.name = name
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325 | def __repr__(self):
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326 | return 'Use %s() or %s to exit' % (self.name, eof)
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327 | def __call__(self, code=None):
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328 | # Shells like IDLE catch the SystemExit, but listen when their
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329 | # stdin wrapper is closed.
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330 | try:
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331 | sys.stdin.close()
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332 | except:
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333 | pass
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334 | raise SystemExit(code)
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335 | __builtin__.quit = Quitter('quit')
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336 | __builtin__.exit = Quitter('exit')
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337 |
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338 |
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339 | class _Printer(object):
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340 | """interactive prompt objects for printing the license text, a list of
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341 | contributors and the copyright notice."""
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342 |
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343 | MAXLINES = 23
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344 |
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345 | def __init__(self, name, data, files=(), dirs=()):
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346 | self.__name = name
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347 | self.__data = data
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348 | self.__files = files
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349 | self.__dirs = dirs
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350 | self.__lines = None
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351 |
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352 | def __setup(self):
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353 | if self.__lines:
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354 | return
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355 | data = None
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356 | for dir in self.__dirs:
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357 | for filename in self.__files:
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358 | filename = os.path.join(dir, filename)
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359 | try:
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360 | fp = file(filename, "rU")
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361 | data = fp.read()
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362 | fp.close()
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363 | break
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364 | except IOError:
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365 | pass
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366 | if data:
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367 | break
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368 | if not data:
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369 | data = self.__data
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370 | self.__lines = data.split('\n')
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371 | self.__linecnt = len(self.__lines)
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372 |
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373 | def __repr__(self):
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374 | self.__setup()
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375 | if len(self.__lines) <= self.MAXLINES:
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376 | return "\n".join(self.__lines)
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377 | else:
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378 | return "Type %s() to see the full %s text" % ((self.__name,)*2)
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379 |
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380 | def __call__(self):
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381 | self.__setup()
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382 | prompt = 'Hit Return for more, or q (and Return) to quit: '
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383 | lineno = 0
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384 | while 1:
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385 | try:
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386 | for i in range(lineno, lineno + self.MAXLINES):
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387 | print self.__lines[i]
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388 | except IndexError:
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389 | break
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390 | else:
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391 | lineno += self.MAXLINES
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392 | key = None
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393 | while key is None:
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394 | key = raw_input(prompt)
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395 | if key not in ('', 'q'):
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396 | key = None
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397 | if key == 'q':
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398 | break
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399 |
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400 | def setcopyright():
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401 | """Set 'copyright' and 'credits' in __builtin__"""
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402 | __builtin__.copyright = _Printer("copyright", sys.copyright)
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403 | if sys.platform[:4] == 'java':
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404 | __builtin__.credits = _Printer(
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405 | "credits",
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406 | "Jython is maintained by the Jython developers (www.jython.org).")
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407 | else:
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408 | __builtin__.credits = _Printer("credits", """\
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409 | Thanks to CWI, CNRI, BeOpen.com, Zope Corporation and a cast of thousands
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410 | for supporting Python development. See www.python.org for more information.""")
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411 | here = os.path.dirname(os.__file__)
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412 | __builtin__.license = _Printer(
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413 | "license", "See http://www.python.org/%.3s/license.html" % sys.version,
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414 | ["LICENSE.txt", "LICENSE"],
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415 | [os.path.join(here, os.pardir), here, os.curdir])
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416 |
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417 |
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418 | class _Helper(object):
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419 | """Define the built-in 'help'.
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420 | This is a wrapper around pydoc.help (with a twist).
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421 |
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422 | """
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423 |
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424 | def __repr__(self):
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425 | return "Type help() for interactive help, " \
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426 | "or help(object) for help about object."
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427 | def __call__(self, *args, **kwds):
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428 | import pydoc
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429 | return pydoc.help(*args, **kwds)
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430 |
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431 | def sethelper():
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432 | __builtin__.help = _Helper()
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433 |
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434 | def aliasmbcs():
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435 | """On Windows, some default encodings are not provided by Python,
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436 | while they are always available as "mbcs" in each locale. Make
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437 | them usable by aliasing to "mbcs" in such a case."""
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438 | if sys.platform == 'win32':
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439 | import locale, codecs
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440 | enc = locale.getdefaultlocale()[1]
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441 | if enc.startswith('cp'): # "cp***" ?
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442 | try:
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443 | codecs.lookup(enc)
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444 | except LookupError:
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445 | import encodings
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446 | encodings._cache[enc] = encodings._unknown
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447 | encodings.aliases.aliases[enc] = 'mbcs'
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448 |
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449 | def setencoding():
|
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450 | """Set the string encoding used by the Unicode implementation. The
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451 | default is 'ascii', but if you're willing to experiment, you can
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452 | change this."""
|
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453 | encoding = "ascii" # Default value set by _PyUnicode_Init()
|
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454 | if 0:
|
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455 | # Enable to support locale aware default string encodings.
|
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456 | import locale
|
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457 | loc = locale.getdefaultlocale()
|
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458 | if loc[1]:
|
---|
459 | encoding = loc[1]
|
---|
460 | if 0:
|
---|
461 | # Enable to switch off string to Unicode coercion and implicit
|
---|
462 | # Unicode to string conversion.
|
---|
463 | encoding = "undefined"
|
---|
464 | if encoding != "ascii":
|
---|
465 | # On Non-Unicode builds this will raise an AttributeError...
|
---|
466 | sys.setdefaultencoding(encoding) # Needs Python Unicode build !
|
---|
467 |
|
---|
468 |
|
---|
469 | def execsitecustomize():
|
---|
470 | """Run custom site specific code, if available."""
|
---|
471 | try:
|
---|
472 | import sitecustomize
|
---|
473 | except ImportError:
|
---|
474 | pass
|
---|
475 |
|
---|
476 |
|
---|
477 | def execusercustomize():
|
---|
478 | """Run custom user specific code, if available."""
|
---|
479 | try:
|
---|
480 | import usercustomize
|
---|
481 | except ImportError:
|
---|
482 | pass
|
---|
483 |
|
---|
484 |
|
---|
485 | def main():
|
---|
486 | global ENABLE_USER_SITE
|
---|
487 |
|
---|
488 | abs__file__()
|
---|
489 | known_paths = removeduppaths()
|
---|
490 | if (os.name == "posix" and sys.path and
|
---|
491 | os.path.basename(sys.path[-1]) == "Modules"):
|
---|
492 | addbuilddir()
|
---|
493 | if ENABLE_USER_SITE is None:
|
---|
494 | ENABLE_USER_SITE = check_enableusersite()
|
---|
495 | known_paths = addusersitepackages(known_paths)
|
---|
496 | known_paths = addsitepackages(known_paths)
|
---|
497 | if sys.platform == 'os2emx' or sys.platform == 'os2knix':
|
---|
498 | if (sys.path and os.path.basename(sys.path[-1]) == "Modules"):
|
---|
499 | addbuilddir()
|
---|
500 | setBEGINLIBPATH()
|
---|
501 | setquit()
|
---|
502 | setcopyright()
|
---|
503 | sethelper()
|
---|
504 | aliasmbcs()
|
---|
505 | setencoding()
|
---|
506 | execsitecustomize()
|
---|
507 | if ENABLE_USER_SITE:
|
---|
508 | execusercustomize()
|
---|
509 | # Remove sys.setdefaultencoding() so that users cannot change the
|
---|
510 | # encoding after initialization. The test for presence is needed when
|
---|
511 | # this module is run as a script, because this code is executed twice.
|
---|
512 | if hasattr(sys, "setdefaultencoding"):
|
---|
513 | del sys.setdefaultencoding
|
---|
514 |
|
---|
515 | main()
|
---|
516 |
|
---|
517 | def _script():
|
---|
518 | help = """\
|
---|
519 | %s [--user-base] [--user-site]
|
---|
520 |
|
---|
521 | Without arguments print some useful information
|
---|
522 | With arguments print the value of USER_BASE and/or USER_SITE separated
|
---|
523 | by '%s'.
|
---|
524 |
|
---|
525 | Exit codes with --user-base or --user-site:
|
---|
526 | 0 - user site directory is enabled
|
---|
527 | 1 - user site directory is disabled by user
|
---|
528 | 2 - uses site directory is disabled by super user
|
---|
529 | or for security reasons
|
---|
530 | >2 - unknown error
|
---|
531 | """
|
---|
532 | args = sys.argv[1:]
|
---|
533 | if not args:
|
---|
534 | print "sys.path = ["
|
---|
535 | for dir in sys.path:
|
---|
536 | print " %r," % (dir,)
|
---|
537 | print "]"
|
---|
538 | print "USER_BASE: %r (%s)" % (USER_BASE,
|
---|
539 | "exists" if os.path.isdir(USER_BASE) else "doesn't exist")
|
---|
540 | print "USER_SITE: %r (%s)" % (USER_SITE,
|
---|
541 | "exists" if os.path.isdir(USER_SITE) else "doesn't exist")
|
---|
542 | print "ENABLE_USER_SITE: %r" % ENABLE_USER_SITE
|
---|
543 | sys.exit(0)
|
---|
544 |
|
---|
545 | buffer = []
|
---|
546 | if '--user-base' in args:
|
---|
547 | buffer.append(USER_BASE)
|
---|
548 | if '--user-site' in args:
|
---|
549 | buffer.append(USER_SITE)
|
---|
550 |
|
---|
551 | if buffer:
|
---|
552 | print os.pathsep.join(buffer)
|
---|
553 | if ENABLE_USER_SITE:
|
---|
554 | sys.exit(0)
|
---|
555 | elif ENABLE_USER_SITE is False:
|
---|
556 | sys.exit(1)
|
---|
557 | elif ENABLE_USER_SITE is None:
|
---|
558 | sys.exit(2)
|
---|
559 | else:
|
---|
560 | sys.exit(3)
|
---|
561 | else:
|
---|
562 | import textwrap
|
---|
563 | print textwrap.dedent(help % (sys.argv[0], os.pathsep))
|
---|
564 | sys.exit(10)
|
---|
565 |
|
---|
566 | if __name__ == '__main__':
|
---|
567 | _script()
|
---|