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annotate lib/python3.8/site-packages/pip/_internal/utils/wheel.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 """Support functions for working with wheel files.
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2 """
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3
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4 from __future__ import absolute_import
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5
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6 import logging
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7 from email.parser import Parser
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8 from zipfile import ZipFile
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9
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10 from pip._vendor.packaging.utils import canonicalize_name
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11 from pip._vendor.pkg_resources import DistInfoDistribution
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12 from pip._vendor.six import PY2, ensure_str
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13
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14 from pip._internal.exceptions import UnsupportedWheel
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15 from pip._internal.utils.pkg_resources import DictMetadata
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16 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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17
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18 if MYPY_CHECK_RUNNING:
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19 from email.message import Message
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20 from typing import Dict, Tuple
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21
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22 from pip._vendor.pkg_resources import Distribution
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23
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24 if PY2:
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25 from zipfile import BadZipfile as BadZipFile
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26 else:
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27 from zipfile import BadZipFile
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28
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29
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30 VERSION_COMPATIBLE = (1, 0)
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31
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32
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33 logger = logging.getLogger(__name__)
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34
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35
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36 class WheelMetadata(DictMetadata):
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37 """Metadata provider that maps metadata decoding exceptions to our
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38 internal exception type.
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39 """
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40 def __init__(self, metadata, wheel_name):
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41 # type: (Dict[str, bytes], str) -> None
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42 super(WheelMetadata, self).__init__(metadata)
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43 self._wheel_name = wheel_name
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44
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45 def get_metadata(self, name):
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46 # type: (str) -> str
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47 try:
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48 return super(WheelMetadata, self).get_metadata(name)
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49 except UnicodeDecodeError as e:
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50 # Augment the default error with the origin of the file.
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51 raise UnsupportedWheel(
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52 "Error decoding metadata for {}: {}".format(
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53 self._wheel_name, e
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54 )
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55 )
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56
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57
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58 def pkg_resources_distribution_for_wheel(wheel_zip, name, location):
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59 # type: (ZipFile, str, str) -> Distribution
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60 """Get a pkg_resources distribution given a wheel.
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61
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62 :raises UnsupportedWheel: on any errors
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63 """
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64 info_dir, _ = parse_wheel(wheel_zip, name)
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65
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66 metadata_files = [
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67 p for p in wheel_zip.namelist() if p.startswith("{}/".format(info_dir))
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68 ]
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69
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70 metadata_text = {} # type: Dict[str, bytes]
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71 for path in metadata_files:
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72 # If a flag is set, namelist entries may be unicode in Python 2.
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73 # We coerce them to native str type to match the types used in the rest
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74 # of the code. This cannot fail because unicode can always be encoded
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75 # with UTF-8.
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76 full_path = ensure_str(path)
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77 _, metadata_name = full_path.split("/", 1)
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78
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79 try:
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80 metadata_text[metadata_name] = read_wheel_metadata_file(
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81 wheel_zip, full_path
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82 )
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83 except UnsupportedWheel as e:
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84 raise UnsupportedWheel(
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85 "{} has an invalid wheel, {}".format(name, str(e))
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86 )
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87
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88 metadata = WheelMetadata(metadata_text, location)
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89
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90 return DistInfoDistribution(
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91 location=location, metadata=metadata, project_name=name
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92 )
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93
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94
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95 def parse_wheel(wheel_zip, name):
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96 # type: (ZipFile, str) -> Tuple[str, Message]
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97 """Extract information from the provided wheel, ensuring it meets basic
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98 standards.
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99
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100 Returns the name of the .dist-info directory and the parsed WHEEL metadata.
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101 """
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102 try:
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103 info_dir = wheel_dist_info_dir(wheel_zip, name)
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104 metadata = wheel_metadata(wheel_zip, info_dir)
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105 version = wheel_version(metadata)
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106 except UnsupportedWheel as e:
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107 raise UnsupportedWheel(
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108 "{} has an invalid wheel, {}".format(name, str(e))
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109 )
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110
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111 check_compatibility(version, name)
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112
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113 return info_dir, metadata
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114
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115
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116 def wheel_dist_info_dir(source, name):
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117 # type: (ZipFile, str) -> str
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118 """Returns the name of the contained .dist-info directory.
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119
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120 Raises AssertionError or UnsupportedWheel if not found, >1 found, or
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121 it doesn't match the provided name.
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122 """
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123 # Zip file path separators must be /
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124 subdirs = list(set(p.split("/")[0] for p in source.namelist()))
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125
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126 info_dirs = [s for s in subdirs if s.endswith('.dist-info')]
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127
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128 if not info_dirs:
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129 raise UnsupportedWheel(".dist-info directory not found")
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130
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131 if len(info_dirs) > 1:
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132 raise UnsupportedWheel(
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133 "multiple .dist-info directories found: {}".format(
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134 ", ".join(info_dirs)
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135 )
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136 )
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137
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138 info_dir = info_dirs[0]
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139
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140 info_dir_name = canonicalize_name(info_dir)
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141 canonical_name = canonicalize_name(name)
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142 if not info_dir_name.startswith(canonical_name):
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143 raise UnsupportedWheel(
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144 ".dist-info directory {!r} does not start with {!r}".format(
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145 info_dir, canonical_name
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146 )
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147 )
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148
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149 # Zip file paths can be unicode or str depending on the zip entry flags,
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150 # so normalize it.
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151 return ensure_str(info_dir)
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152
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153
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154 def read_wheel_metadata_file(source, path):
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155 # type: (ZipFile, str) -> bytes
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156 try:
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157 return source.read(path)
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158 # BadZipFile for general corruption, KeyError for missing entry,
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159 # and RuntimeError for password-protected files
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160 except (BadZipFile, KeyError, RuntimeError) as e:
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161 raise UnsupportedWheel(
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162 "could not read {!r} file: {!r}".format(path, e)
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163 )
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164
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165
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166 def wheel_metadata(source, dist_info_dir):
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167 # type: (ZipFile, str) -> Message
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168 """Return the WHEEL metadata of an extracted wheel, if possible.
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169 Otherwise, raise UnsupportedWheel.
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170 """
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171 path = "{}/WHEEL".format(dist_info_dir)
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172 # Zip file path separators must be /
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173 wheel_contents = read_wheel_metadata_file(source, path)
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174
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175 try:
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176 wheel_text = ensure_str(wheel_contents)
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177 except UnicodeDecodeError as e:
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178 raise UnsupportedWheel("error decoding {!r}: {!r}".format(path, e))
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179
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180 # FeedParser (used by Parser) does not raise any exceptions. The returned
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181 # message may have .defects populated, but for backwards-compatibility we
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182 # currently ignore them.
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183 return Parser().parsestr(wheel_text)
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184
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185
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186 def wheel_version(wheel_data):
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187 # type: (Message) -> Tuple[int, ...]
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188 """Given WHEEL metadata, return the parsed Wheel-Version.
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189 Otherwise, raise UnsupportedWheel.
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190 """
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191 version_text = wheel_data["Wheel-Version"]
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192 if version_text is None:
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193 raise UnsupportedWheel("WHEEL is missing Wheel-Version")
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194
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195 version = version_text.strip()
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196
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197 try:
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198 return tuple(map(int, version.split('.')))
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199 except ValueError:
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200 raise UnsupportedWheel("invalid Wheel-Version: {!r}".format(version))
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201
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202
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203 def check_compatibility(version, name):
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204 # type: (Tuple[int, ...], str) -> None
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205 """Raises errors or warns if called with an incompatible Wheel-Version.
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206
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207 Pip should refuse to install a Wheel-Version that's a major series
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208 ahead of what it's compatible with (e.g 2.0 > 1.1); and warn when
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209 installing a version only minor version ahead (e.g 1.2 > 1.1).
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210
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211 version: a 2-tuple representing a Wheel-Version (Major, Minor)
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212 name: name of wheel or package to raise exception about
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213
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214 :raises UnsupportedWheel: when an incompatible Wheel-Version is given
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215 """
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216 if version[0] > VERSION_COMPATIBLE[0]:
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217 raise UnsupportedWheel(
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218 "%s's Wheel-Version (%s) is not compatible with this version "
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219 "of pip" % (name, '.'.join(map(str, version)))
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220 )
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221 elif version > VERSION_COMPATIBLE:
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222 logger.warning(
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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223 'Installing from a newer Wheel-Version (%s)',
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224 '.'.join(map(str, version)),
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225 )