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annotate lib/python3.8/site-packages/pip/_internal/exceptions.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 """Exceptions used throughout package"""
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2
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3 # The following comment should be removed at some point in the future.
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4 # mypy: disallow-untyped-defs=False
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5
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6 from __future__ import absolute_import
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7
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8 from itertools import chain, groupby, repeat
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9
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10 from pip._vendor.six import iteritems
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11
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12 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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13
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14 if MYPY_CHECK_RUNNING:
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15 from typing import Optional
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16 from pip._vendor.pkg_resources import Distribution
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17 from pip._internal.req.req_install import InstallRequirement
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18
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19
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20 class PipError(Exception):
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21 """Base pip exception"""
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22
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23
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24 class ConfigurationError(PipError):
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25 """General exception in configuration"""
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26
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27
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28 class InstallationError(PipError):
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29 """General exception during installation"""
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30
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31
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32 class UninstallationError(PipError):
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33 """General exception during uninstallation"""
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34
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35
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36 class NoneMetadataError(PipError):
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37 """
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38 Raised when accessing "METADATA" or "PKG-INFO" metadata for a
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39 pip._vendor.pkg_resources.Distribution object and
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40 `dist.has_metadata('METADATA')` returns True but
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41 `dist.get_metadata('METADATA')` returns None (and similarly for
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42 "PKG-INFO").
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43 """
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44
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45 def __init__(self, dist, metadata_name):
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46 # type: (Distribution, str) -> None
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47 """
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48 :param dist: A Distribution object.
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49 :param metadata_name: The name of the metadata being accessed
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50 (can be "METADATA" or "PKG-INFO").
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51 """
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52 self.dist = dist
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53 self.metadata_name = metadata_name
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54
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55 def __str__(self):
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56 # type: () -> str
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57 # Use `dist` in the error message because its stringification
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58 # includes more information, like the version and location.
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59 return (
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60 'None {} metadata found for distribution: {}'.format(
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61 self.metadata_name, self.dist,
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62 )
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63 )
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64
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65
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66 class DistributionNotFound(InstallationError):
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67 """Raised when a distribution cannot be found to satisfy a requirement"""
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68
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69
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70 class RequirementsFileParseError(InstallationError):
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71 """Raised when a general error occurs parsing a requirements file line."""
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72
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73
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74 class BestVersionAlreadyInstalled(PipError):
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75 """Raised when the most up-to-date version of a package is already
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76 installed."""
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77
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78
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79 class BadCommand(PipError):
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80 """Raised when virtualenv or a command is not found"""
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81
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82
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83 class CommandError(PipError):
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84 """Raised when there is an error in command-line arguments"""
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85
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86
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87 class PreviousBuildDirError(PipError):
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88 """Raised when there's a previous conflicting build directory"""
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89
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90
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91 class InvalidWheelFilename(InstallationError):
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92 """Invalid wheel filename."""
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93
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94
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95 class UnsupportedWheel(InstallationError):
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96 """Unsupported wheel."""
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97
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98
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99 class HashErrors(InstallationError):
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100 """Multiple HashError instances rolled into one for reporting"""
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101
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102 def __init__(self):
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103 self.errors = []
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104
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105 def append(self, error):
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106 self.errors.append(error)
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107
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108 def __str__(self):
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109 lines = []
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110 self.errors.sort(key=lambda e: e.order)
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111 for cls, errors_of_cls in groupby(self.errors, lambda e: e.__class__):
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112 lines.append(cls.head)
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113 lines.extend(e.body() for e in errors_of_cls)
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114 if lines:
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115 return '\n'.join(lines)
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116
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117 def __nonzero__(self):
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118 return bool(self.errors)
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119
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120 def __bool__(self):
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121 return self.__nonzero__()
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122
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123
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124 class HashError(InstallationError):
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125 """
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126 A failure to verify a package against known-good hashes
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127
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128 :cvar order: An int sorting hash exception classes by difficulty of
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129 recovery (lower being harder), so the user doesn't bother fretting
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130 about unpinned packages when he has deeper issues, like VCS
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131 dependencies, to deal with. Also keeps error reports in a
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132 deterministic order.
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133 :cvar head: A section heading for display above potentially many
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134 exceptions of this kind
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135 :ivar req: The InstallRequirement that triggered this error. This is
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136 pasted on after the exception is instantiated, because it's not
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137 typically available earlier.
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138
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139 """
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140 req = None # type: Optional[InstallRequirement]
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141 head = ''
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142
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143 def body(self):
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144 """Return a summary of me for display under the heading.
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145
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146 This default implementation simply prints a description of the
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147 triggering requirement.
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148
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149 :param req: The InstallRequirement that provoked this error, with
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150 populate_link() having already been called
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151
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152 """
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153 return ' %s' % self._requirement_name()
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154
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155 def __str__(self):
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156 return '%s\n%s' % (self.head, self.body())
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157
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158 def _requirement_name(self):
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159 """Return a description of the requirement that triggered me.
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160
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161 This default implementation returns long description of the req, with
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162 line numbers
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163
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164 """
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165 return str(self.req) if self.req else 'unknown package'
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166
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167
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168 class VcsHashUnsupported(HashError):
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169 """A hash was provided for a version-control-system-based requirement, but
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170 we don't have a method for hashing those."""
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171
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172 order = 0
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173 head = ("Can't verify hashes for these requirements because we don't "
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174 "have a way to hash version control repositories:")
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175
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176
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177 class DirectoryUrlHashUnsupported(HashError):
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178 """A hash was provided for a version-control-system-based requirement, but
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179 we don't have a method for hashing those."""
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180
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181 order = 1
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182 head = ("Can't verify hashes for these file:// requirements because they "
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183 "point to directories:")
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184
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185
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186 class HashMissing(HashError):
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187 """A hash was needed for a requirement but is absent."""
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188
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189 order = 2
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190 head = ('Hashes are required in --require-hashes mode, but they are '
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191 'missing from some requirements. Here is a list of those '
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192 'requirements along with the hashes their downloaded archives '
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193 'actually had. Add lines like these to your requirements files to '
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194 'prevent tampering. (If you did not enable --require-hashes '
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195 'manually, note that it turns on automatically when any package '
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196 'has a hash.)')
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197
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198 def __init__(self, gotten_hash):
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199 """
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200 :param gotten_hash: The hash of the (possibly malicious) archive we
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201 just downloaded
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202 """
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203 self.gotten_hash = gotten_hash
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204
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205 def body(self):
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206 # Dodge circular import.
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207 from pip._internal.utils.hashes import FAVORITE_HASH
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208
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209 package = None
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210 if self.req:
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211 # In the case of URL-based requirements, display the original URL
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212 # seen in the requirements file rather than the package name,
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213 # so the output can be directly copied into the requirements file.
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214 package = (self.req.original_link if self.req.original_link
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215 # In case someone feeds something downright stupid
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216 # to InstallRequirement's constructor.
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217 else getattr(self.req, 'req', None))
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218 return ' %s --hash=%s:%s' % (package or 'unknown package',
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219 FAVORITE_HASH,
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220 self.gotten_hash)
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221
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222
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223 class HashUnpinned(HashError):
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224 """A requirement had a hash specified but was not pinned to a specific
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225 version."""
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226
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227 order = 3
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228 head = ('In --require-hashes mode, all requirements must have their '
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229 'versions pinned with ==. These do not:')
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230
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231
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232 class HashMismatch(HashError):
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233 """
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234 Distribution file hash values don't match.
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235
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236 :ivar package_name: The name of the package that triggered the hash
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237 mismatch. Feel free to write to this after the exception is raise to
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238 improve its error message.
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239
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240 """
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241 order = 4
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242 head = ('THESE PACKAGES DO NOT MATCH THE HASHES FROM THE REQUIREMENTS '
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243 'FILE. If you have updated the package versions, please update '
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244 'the hashes. Otherwise, examine the package contents carefully; '
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245 'someone may have tampered with them.')
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246
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247 def __init__(self, allowed, gots):
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248 """
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249 :param allowed: A dict of algorithm names pointing to lists of allowed
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250 hex digests
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251 :param gots: A dict of algorithm names pointing to hashes we
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252 actually got from the files under suspicion
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253 """
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254 self.allowed = allowed
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255 self.gots = gots
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256
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257 def body(self):
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258 return ' %s:\n%s' % (self._requirement_name(),
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259 self._hash_comparison())
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260
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261 def _hash_comparison(self):
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262 """
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263 Return a comparison of actual and expected hash values.
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264
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265 Example::
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266
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267 Expected sha256 abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcde
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268 or 123451234512345123451234512345123451234512345
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269 Got bcdefbcdefbcdefbcdefbcdefbcdefbcdefbcdefbcdef
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270
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271 """
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272 def hash_then_or(hash_name):
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273 # For now, all the decent hashes have 6-char names, so we can get
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274 # away with hard-coding space literals.
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275 return chain([hash_name], repeat(' or'))
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276
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277 lines = []
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278 for hash_name, expecteds in iteritems(self.allowed):
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279 prefix = hash_then_or(hash_name)
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280 lines.extend((' Expected %s %s' % (next(prefix), e))
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281 for e in expecteds)
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282 lines.append(' Got %s\n' %
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283 self.gots[hash_name].hexdigest())
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284 return '\n'.join(lines)
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285
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286
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287 class UnsupportedPythonVersion(InstallationError):
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288 """Unsupported python version according to Requires-Python package
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289 metadata."""
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290
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291
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292 class ConfigurationFileCouldNotBeLoaded(ConfigurationError):
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293 """When there are errors while loading a configuration file
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294 """
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295
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296 def __init__(self, reason="could not be loaded", fname=None, error=None):
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297 super(ConfigurationFileCouldNotBeLoaded, self).__init__(error)
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298 self.reason = reason
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299 self.fname = fname
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300 self.error = error
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301
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302 def __str__(self):
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303 if self.fname is not None:
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304 message_part = " in {}.".format(self.fname)
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305 else:
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306 assert self.error is not None
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307 message_part = ".\n{}\n".format(self.error.message)
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308 return "Configuration file {}{}".format(self.reason, message_part)