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annotate lib/python3.8/site-packages/pip/_internal/utils/unpacking.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 """Utilities related archives.
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2 """
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3
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4 # The following comment should be removed at some point in the future.
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5 # mypy: strict-optional=False
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6 # mypy: disallow-untyped-defs=False
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7
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8 from __future__ import absolute_import
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9
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10 import logging
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11 import os
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12 import shutil
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13 import stat
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14 import tarfile
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15 import zipfile
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16
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17 from pip._internal.exceptions import InstallationError
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18 from pip._internal.utils.filetypes import (
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19 BZ2_EXTENSIONS,
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20 TAR_EXTENSIONS,
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21 XZ_EXTENSIONS,
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22 ZIP_EXTENSIONS,
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23 )
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24 from pip._internal.utils.misc import ensure_dir
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25 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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26
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27 if MYPY_CHECK_RUNNING:
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28 from typing import Iterable, List, Optional, Text, Union
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29
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30
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31 logger = logging.getLogger(__name__)
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32
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33
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34 SUPPORTED_EXTENSIONS = ZIP_EXTENSIONS + TAR_EXTENSIONS
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35
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36 try:
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37 import bz2 # noqa
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38 SUPPORTED_EXTENSIONS += BZ2_EXTENSIONS
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39 except ImportError:
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40 logger.debug('bz2 module is not available')
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41
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42 try:
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43 # Only for Python 3.3+
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44 import lzma # noqa
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45 SUPPORTED_EXTENSIONS += XZ_EXTENSIONS
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46 except ImportError:
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47 logger.debug('lzma module is not available')
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48
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49
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50 def current_umask():
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51 """Get the current umask which involves having to set it temporarily."""
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52 mask = os.umask(0)
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53 os.umask(mask)
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54 return mask
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55
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56
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57 def split_leading_dir(path):
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58 # type: (Union[str, Text]) -> List[Union[str, Text]]
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59 path = path.lstrip('/').lstrip('\\')
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60 if (
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61 '/' in path and (
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62 ('\\' in path and path.find('/') < path.find('\\')) or
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63 '\\' not in path
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64 )
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65 ):
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66 return path.split('/', 1)
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67 elif '\\' in path:
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68 return path.split('\\', 1)
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69 else:
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70 return [path, '']
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71
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72
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73 def has_leading_dir(paths):
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74 # type: (Iterable[Union[str, Text]]) -> bool
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75 """Returns true if all the paths have the same leading path name
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76 (i.e., everything is in one subdirectory in an archive)"""
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77 common_prefix = None
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78 for path in paths:
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79 prefix, rest = split_leading_dir(path)
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80 if not prefix:
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81 return False
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82 elif common_prefix is None:
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83 common_prefix = prefix
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84 elif prefix != common_prefix:
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85 return False
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86 return True
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87
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88
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89 def is_within_directory(directory, target):
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90 # type: ((Union[str, Text]), (Union[str, Text])) -> bool
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91 """
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92 Return true if the absolute path of target is within the directory
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93 """
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94 abs_directory = os.path.abspath(directory)
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95 abs_target = os.path.abspath(target)
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96
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97 prefix = os.path.commonprefix([abs_directory, abs_target])
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98 return prefix == abs_directory
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99
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100
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101 def unzip_file(filename, location, flatten=True):
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102 # type: (str, str, bool) -> None
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103 """
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104 Unzip the file (with path `filename`) to the destination `location`. All
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105 files are written based on system defaults and umask (i.e. permissions are
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106 not preserved), except that regular file members with any execute
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107 permissions (user, group, or world) have "chmod +x" applied after being
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108 written. Note that for windows, any execute changes using os.chmod are
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109 no-ops per the python docs.
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110 """
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111 ensure_dir(location)
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112 zipfp = open(filename, 'rb')
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113 try:
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114 zip = zipfile.ZipFile(zipfp, allowZip64=True)
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115 leading = has_leading_dir(zip.namelist()) and flatten
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116 for info in zip.infolist():
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117 name = info.filename
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118 fn = name
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119 if leading:
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120 fn = split_leading_dir(name)[1]
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121 fn = os.path.join(location, fn)
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122 dir = os.path.dirname(fn)
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123 if not is_within_directory(location, fn):
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124 message = (
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125 'The zip file ({}) has a file ({}) trying to install '
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126 'outside target directory ({})'
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127 )
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128 raise InstallationError(message.format(filename, fn, location))
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129 if fn.endswith('/') or fn.endswith('\\'):
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130 # A directory
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131 ensure_dir(fn)
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132 else:
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133 ensure_dir(dir)
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134 # Don't use read() to avoid allocating an arbitrarily large
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135 # chunk of memory for the file's content
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136 fp = zip.open(name)
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137 try:
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138 with open(fn, 'wb') as destfp:
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139 shutil.copyfileobj(fp, destfp)
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140 finally:
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141 fp.close()
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142 mode = info.external_attr >> 16
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143 # if mode and regular file and any execute permissions for
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144 # user/group/world?
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145 if mode and stat.S_ISREG(mode) and mode & 0o111:
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146 # make dest file have execute for user/group/world
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147 # (chmod +x) no-op on windows per python docs
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148 os.chmod(fn, (0o777 - current_umask() | 0o111))
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149 finally:
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150 zipfp.close()
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151
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152
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153 def untar_file(filename, location):
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154 # type: (str, str) -> None
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155 """
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156 Untar the file (with path `filename`) to the destination `location`.
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157 All files are written based on system defaults and umask (i.e. permissions
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158 are not preserved), except that regular file members with any execute
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159 permissions (user, group, or world) have "chmod +x" applied after being
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160 written. Note that for windows, any execute changes using os.chmod are
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161 no-ops per the python docs.
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162 """
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163 ensure_dir(location)
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164 if filename.lower().endswith('.gz') or filename.lower().endswith('.tgz'):
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165 mode = 'r:gz'
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166 elif filename.lower().endswith(BZ2_EXTENSIONS):
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167 mode = 'r:bz2'
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168 elif filename.lower().endswith(XZ_EXTENSIONS):
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169 mode = 'r:xz'
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170 elif filename.lower().endswith('.tar'):
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171 mode = 'r'
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172 else:
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173 logger.warning(
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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174 'Cannot determine compression type for file %s', filename,
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175 )
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176 mode = 'r:*'
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177 tar = tarfile.open(filename, mode)
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178 try:
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179 leading = has_leading_dir([
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180 member.name for member in tar.getmembers()
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181 ])
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182 for member in tar.getmembers():
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183 fn = member.name
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184 if leading:
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185 # https://github.com/python/mypy/issues/1174
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186 fn = split_leading_dir(fn)[1] # type: ignore
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187 path = os.path.join(location, fn)
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188 if not is_within_directory(location, path):
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189 message = (
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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190 'The tar file ({}) has a file ({}) trying to install '
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191 'outside target directory ({})'
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192 )
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193 raise InstallationError(
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194 message.format(filename, path, location)
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195 )
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196 if member.isdir():
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197 ensure_dir(path)
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198 elif member.issym():
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199 try:
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200 # https://github.com/python/typeshed/issues/2673
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201 tar._extract_member(member, path) # type: ignore
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202 except Exception as exc:
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203 # Some corrupt tar files seem to produce this
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204 # (specifically bad symlinks)
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205 logger.warning(
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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206 'In the tar file %s the member %s is invalid: %s',
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207 filename, member.name, exc,
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208 )
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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209 continue
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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210 else:
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211 try:
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212 fp = tar.extractfile(member)
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213 except (KeyError, AttributeError) as exc:
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214 # Some corrupt tar files seem to produce this
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215 # (specifically bad symlinks)
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216 logger.warning(
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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217 'In the tar file %s the member %s is invalid: %s',
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218 filename, member.name, exc,
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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diff changeset
219 )
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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220 continue
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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221 ensure_dir(os.path.dirname(path))
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222 with open(path, 'wb') as destfp:
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223 shutil.copyfileobj(fp, destfp)
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224 fp.close()
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225 # Update the timestamp (useful for cython compiled files)
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226 # https://github.com/python/typeshed/issues/2673
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227 tar.utime(member, path) # type: ignore
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228 # member have any execute permissions for user/group/world?
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229 if member.mode & 0o111:
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230 # make dest file have execute for user/group/world
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231 # no-op on windows per python docs
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232 os.chmod(path, (0o777 - current_umask() | 0o111))
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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233 finally:
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234 tar.close()
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235
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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236
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237 def unpack_file(
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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238 filename, # type: str
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239 location, # type: str
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240 content_type=None, # type: Optional[str]
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241 ):
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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242 # type: (...) -> None
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243 filename = os.path.realpath(filename)
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244 if (
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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245 content_type == 'application/zip' or
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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246 filename.lower().endswith(ZIP_EXTENSIONS) or
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247 zipfile.is_zipfile(filename)
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248 ):
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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249 unzip_file(
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
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250 filename,
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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251 location,
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252 flatten=not filename.endswith('.whl')
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253 )
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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254 elif (
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255 content_type == 'application/x-gzip' or
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256 tarfile.is_tarfile(filename) or
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257 filename.lower().endswith(
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258 TAR_EXTENSIONS + BZ2_EXTENSIONS + XZ_EXTENSIONS
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259 )
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260 ):
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261 untar_file(filename, location)
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262 else:
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263 # FIXME: handle?
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264 # FIXME: magic signatures?
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265 logger.critical(
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266 'Cannot unpack file %s (downloaded from %s, content-type: %s); '
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267 'cannot detect archive format',
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268 filename, location, content_type,
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269 )
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270 raise InstallationError(
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271 'Cannot determine archive format of {}'.format(location)
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272 )