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annotate lib/python3.8/site-packages/pip/_internal/configuration.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 """Configuration management setup
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2
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3 Some terminology:
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4 - name
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5 As written in config files.
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6 - value
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7 Value associated with a name
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8 - key
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9 Name combined with it's section (section.name)
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10 - variant
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11 A single word describing where the configuration key-value pair came from
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12 """
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13
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14 # The following comment should be removed at some point in the future.
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15 # mypy: strict-optional=False
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16
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17 import locale
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18 import logging
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19 import os
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20 import sys
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21
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22 from pip._vendor.six.moves import configparser
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23
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24 from pip._internal.exceptions import (
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25 ConfigurationError,
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26 ConfigurationFileCouldNotBeLoaded,
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27 )
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28 from pip._internal.utils import appdirs
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29 from pip._internal.utils.compat import WINDOWS, expanduser
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30 from pip._internal.utils.misc import ensure_dir, enum
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31 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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32
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33 if MYPY_CHECK_RUNNING:
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34 from typing import (
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35 Any, Dict, Iterable, List, NewType, Optional, Tuple
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36 )
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37
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38 RawConfigParser = configparser.RawConfigParser # Shorthand
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39 Kind = NewType("Kind", str)
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40
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41 logger = logging.getLogger(__name__)
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42
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43
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44 # NOTE: Maybe use the optionx attribute to normalize keynames.
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45 def _normalize_name(name):
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46 # type: (str) -> str
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47 """Make a name consistent regardless of source (environment or file)
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48 """
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49 name = name.lower().replace('_', '-')
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50 if name.startswith('--'):
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51 name = name[2:] # only prefer long opts
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52 return name
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53
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54
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55 def _disassemble_key(name):
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56 # type: (str) -> List[str]
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57 if "." not in name:
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58 error_message = (
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59 "Key does not contain dot separated section and key. "
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60 "Perhaps you wanted to use 'global.{}' instead?"
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61 ).format(name)
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62 raise ConfigurationError(error_message)
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63 return name.split(".", 1)
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64
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65
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66 # The kinds of configurations there are.
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67 kinds = enum(
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68 USER="user", # User Specific
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69 GLOBAL="global", # System Wide
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70 SITE="site", # [Virtual] Environment Specific
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71 ENV="env", # from PIP_CONFIG_FILE
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72 ENV_VAR="env-var", # from Environment Variables
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73 )
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74
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75
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76 CONFIG_BASENAME = 'pip.ini' if WINDOWS else 'pip.conf'
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77
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78
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79 def get_configuration_files():
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80 # type: () -> Dict[Kind, List[str]]
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81 global_config_files = [
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82 os.path.join(path, CONFIG_BASENAME)
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83 for path in appdirs.site_config_dirs('pip')
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84 ]
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85
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86 site_config_file = os.path.join(sys.prefix, CONFIG_BASENAME)
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87 legacy_config_file = os.path.join(
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88 expanduser('~'),
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89 'pip' if WINDOWS else '.pip',
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90 CONFIG_BASENAME,
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91 )
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92 new_config_file = os.path.join(
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93 appdirs.user_config_dir("pip"), CONFIG_BASENAME
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94 )
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95 return {
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96 kinds.GLOBAL: global_config_files,
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97 kinds.SITE: [site_config_file],
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98 kinds.USER: [legacy_config_file, new_config_file],
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99 }
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100
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101
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102 class Configuration(object):
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103 """Handles management of configuration.
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104
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105 Provides an interface to accessing and managing configuration files.
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106
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107 This class converts provides an API that takes "section.key-name" style
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108 keys and stores the value associated with it as "key-name" under the
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109 section "section".
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110
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111 This allows for a clean interface wherein the both the section and the
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112 key-name are preserved in an easy to manage form in the configuration files
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113 and the data stored is also nice.
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114 """
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115
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116 def __init__(self, isolated, load_only=None):
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117 # type: (bool, Kind) -> None
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118 super(Configuration, self).__init__()
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119
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120 _valid_load_only = [kinds.USER, kinds.GLOBAL, kinds.SITE, None]
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121 if load_only not in _valid_load_only:
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122 raise ConfigurationError(
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123 "Got invalid value for load_only - should be one of {}".format(
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124 ", ".join(map(repr, _valid_load_only[:-1]))
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125 )
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126 )
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127 self.isolated = isolated # type: bool
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128 self.load_only = load_only # type: Optional[Kind]
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129
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130 # The order here determines the override order.
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131 self._override_order = [
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132 kinds.GLOBAL, kinds.USER, kinds.SITE, kinds.ENV, kinds.ENV_VAR
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133 ]
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134
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135 self._ignore_env_names = ["version", "help"]
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136
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137 # Because we keep track of where we got the data from
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138 self._parsers = {
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139 variant: [] for variant in self._override_order
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140 } # type: Dict[Kind, List[Tuple[str, RawConfigParser]]]
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141 self._config = {
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142 variant: {} for variant in self._override_order
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143 } # type: Dict[Kind, Dict[str, Any]]
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144 self._modified_parsers = [] # type: List[Tuple[str, RawConfigParser]]
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145
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146 def load(self):
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147 # type: () -> None
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148 """Loads configuration from configuration files and environment
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149 """
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150 self._load_config_files()
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151 if not self.isolated:
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152 self._load_environment_vars()
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153
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154 def get_file_to_edit(self):
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155 # type: () -> Optional[str]
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156 """Returns the file with highest priority in configuration
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157 """
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158 assert self.load_only is not None, \
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159 "Need to be specified a file to be editing"
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160
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161 try:
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162 return self._get_parser_to_modify()[0]
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163 except IndexError:
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164 return None
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165
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166 def items(self):
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167 # type: () -> Iterable[Tuple[str, Any]]
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168 """Returns key-value pairs like dict.items() representing the loaded
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169 configuration
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170 """
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171 return self._dictionary.items()
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172
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173 def get_value(self, key):
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174 # type: (str) -> Any
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175 """Get a value from the configuration.
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176 """
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177 try:
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178 return self._dictionary[key]
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179 except KeyError:
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180 raise ConfigurationError("No such key - {}".format(key))
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181
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182 def set_value(self, key, value):
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183 # type: (str, Any) -> None
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184 """Modify a value in the configuration.
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185 """
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186 self._ensure_have_load_only()
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187
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188 fname, parser = self._get_parser_to_modify()
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189
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190 if parser is not None:
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191 section, name = _disassemble_key(key)
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192
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193 # Modify the parser and the configuration
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194 if not parser.has_section(section):
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195 parser.add_section(section)
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196 parser.set(section, name, value)
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197
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198 self._config[self.load_only][key] = value
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199 self._mark_as_modified(fname, parser)
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200
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201 def unset_value(self, key):
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202 # type: (str) -> None
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203 """Unset a value in the configuration.
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204 """
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205 self._ensure_have_load_only()
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206
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207 if key not in self._config[self.load_only]:
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208 raise ConfigurationError("No such key - {}".format(key))
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209
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210 fname, parser = self._get_parser_to_modify()
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211
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212 if parser is not None:
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213 section, name = _disassemble_key(key)
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214
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215 # Remove the key in the parser
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216 modified_something = False
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217 if parser.has_section(section):
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218 # Returns whether the option was removed or not
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219 modified_something = parser.remove_option(section, name)
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220
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221 if modified_something:
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222 # name removed from parser, section may now be empty
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223 section_iter = iter(parser.items(section))
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224 try:
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225 val = next(section_iter)
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226 except StopIteration:
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227 val = None
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228
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229 if val is None:
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230 parser.remove_section(section)
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231
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232 self._mark_as_modified(fname, parser)
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233 else:
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234 raise ConfigurationError(
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235 "Fatal Internal error [id=1]. Please report as a bug."
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236 )
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237
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238 del self._config[self.load_only][key]
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239
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240 def save(self):
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241 # type: () -> None
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242 """Save the current in-memory state.
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243 """
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244 self._ensure_have_load_only()
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245
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246 for fname, parser in self._modified_parsers:
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247 logger.info("Writing to %s", fname)
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248
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249 # Ensure directory exists.
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250 ensure_dir(os.path.dirname(fname))
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251
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252 with open(fname, "w") as f:
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253 parser.write(f)
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254
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255 #
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256 # Private routines
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257 #
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258
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259 def _ensure_have_load_only(self):
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260 # type: () -> None
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261 if self.load_only is None:
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262 raise ConfigurationError("Needed a specific file to be modifying.")
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263 logger.debug("Will be working with %s variant only", self.load_only)
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264
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265 @property
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266 def _dictionary(self):
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267 # type: () -> Dict[str, Any]
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268 """A dictionary representing the loaded configuration.
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269 """
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270 # NOTE: Dictionaries are not populated if not loaded. So, conditionals
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271 # are not needed here.
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272 retval = {}
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273
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274 for variant in self._override_order:
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275 retval.update(self._config[variant])
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276
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277 return retval
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278
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279 def _load_config_files(self):
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280 # type: () -> None
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281 """Loads configuration from configuration files
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282 """
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283 config_files = dict(self._iter_config_files())
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284 if config_files[kinds.ENV][0:1] == [os.devnull]:
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285 logger.debug(
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286 "Skipping loading configuration files due to "
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287 "environment's PIP_CONFIG_FILE being os.devnull"
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288 )
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289 return
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290
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291 for variant, files in config_files.items():
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292 for fname in files:
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293 # If there's specific variant set in `load_only`, load only
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294 # that variant, not the others.
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295 if self.load_only is not None and variant != self.load_only:
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296 logger.debug(
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297 "Skipping file '%s' (variant: %s)", fname, variant
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298 )
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299 continue
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300
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301 parser = self._load_file(variant, fname)
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302
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303 # Keeping track of the parsers used
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304 self._parsers[variant].append((fname, parser))
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305
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306 def _load_file(self, variant, fname):
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307 # type: (Kind, str) -> RawConfigParser
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308 logger.debug("For variant '%s', will try loading '%s'", variant, fname)
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309 parser = self._construct_parser(fname)
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310
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311 for section in parser.sections():
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312 items = parser.items(section)
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313 self._config[variant].update(self._normalized_keys(section, items))
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314
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315 return parser
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316
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317 def _construct_parser(self, fname):
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318 # type: (str) -> RawConfigParser
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319 parser = configparser.RawConfigParser()
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320 # If there is no such file, don't bother reading it but create the
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321 # parser anyway, to hold the data.
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322 # Doing this is useful when modifying and saving files, where we don't
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323 # need to construct a parser.
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324 if os.path.exists(fname):
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325 try:
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326 parser.read(fname)
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327 except UnicodeDecodeError:
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328 # See https://github.com/pypa/pip/issues/4963
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329 raise ConfigurationFileCouldNotBeLoaded(
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330 reason="contains invalid {} characters".format(
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331 locale.getpreferredencoding(False)
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332 ),
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333 fname=fname,
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334 )
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335 except configparser.Error as error:
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336 # See https://github.com/pypa/pip/issues/4893
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337 raise ConfigurationFileCouldNotBeLoaded(error=error)
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338 return parser
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339
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340 def _load_environment_vars(self):
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341 # type: () -> None
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342 """Loads configuration from environment variables
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343 """
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344 self._config[kinds.ENV_VAR].update(
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345 self._normalized_keys(":env:", self._get_environ_vars())
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346 )
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347
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348 def _normalized_keys(self, section, items):
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349 # type: (str, Iterable[Tuple[str, Any]]) -> Dict[str, Any]
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350 """Normalizes items to construct a dictionary with normalized keys.
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351
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352 This routine is where the names become keys and are made the same
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353 regardless of source - configuration files or environment.
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354 """
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355 normalized = {}
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356 for name, val in items:
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357 key = section + "." + _normalize_name(name)
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358 normalized[key] = val
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359 return normalized
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360
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361 def _get_environ_vars(self):
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362 # type: () -> Iterable[Tuple[str, str]]
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363 """Returns a generator with all environmental vars with prefix PIP_"""
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364 for key, val in os.environ.items():
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365 should_be_yielded = (
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366 key.startswith("PIP_") and
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367 key[4:].lower() not in self._ignore_env_names
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368 )
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369 if should_be_yielded:
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370 yield key[4:].lower(), val
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371
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372 # XXX: This is patched in the tests.
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373 def _iter_config_files(self):
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374 # type: () -> Iterable[Tuple[Kind, List[str]]]
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375 """Yields variant and configuration files associated with it.
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376
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377 This should be treated like items of a dictionary.
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378 """
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379 # SMELL: Move the conditions out of this function
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380
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381 # environment variables have the lowest priority
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382 config_file = os.environ.get('PIP_CONFIG_FILE', None)
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383 if config_file is not None:
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384 yield kinds.ENV, [config_file]
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385 else:
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386 yield kinds.ENV, []
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387
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388 config_files = get_configuration_files()
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guerler
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389
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390 # at the base we have any global configuration
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391 yield kinds.GLOBAL, config_files[kinds.GLOBAL]
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guerler
parents:
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392
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393 # per-user configuration next
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394 should_load_user_config = not self.isolated and not (
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guerler
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395 config_file and os.path.exists(config_file)
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guerler
parents:
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396 )
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guerler
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397 if should_load_user_config:
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guerler
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398 # The legacy config file is overridden by the new config file
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guerler
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399 yield kinds.USER, config_files[kinds.USER]
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guerler
parents:
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400
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guerler
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401 # finally virtualenv configuration first trumping others
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guerler
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402 yield kinds.SITE, config_files[kinds.SITE]
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guerler
parents:
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403
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guerler
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404 def _get_parser_to_modify(self):
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guerler
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405 # type: () -> Tuple[str, RawConfigParser]
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guerler
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406 # Determine which parser to modify
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407 parsers = self._parsers[self.load_only]
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guerler
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408 if not parsers:
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guerler
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409 # This should not happen if everything works correctly.
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guerler
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410 raise ConfigurationError(
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guerler
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411 "Fatal Internal error [id=2]. Please report as a bug."
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guerler
parents:
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412 )
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guerler
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413
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guerler
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414 # Use the highest priority parser.
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415 return parsers[-1]
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416
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guerler
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417 # XXX: This is patched in the tests.
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guerler
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418 def _mark_as_modified(self, fname, parser):
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guerler
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419 # type: (str, RawConfigParser) -> None
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guerler
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420 file_parser_tuple = (fname, parser)
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guerler
parents:
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421 if file_parser_tuple not in self._modified_parsers:
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guerler
parents:
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422 self._modified_parsers.append(file_parser_tuple)