Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/pip/_internal/configuration.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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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 import locale
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15 import logging
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16 import os
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17 import sys
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18
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19 from pip._vendor.six.moves import configparser
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20
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21 from pip._internal.exceptions import (
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22 ConfigurationError, ConfigurationFileCouldNotBeLoaded,
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23 )
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24 from pip._internal.utils import appdirs
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25 from pip._internal.utils.compat import WINDOWS, expanduser
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26 from pip._internal.utils.misc import ensure_dir, enum
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27 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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28
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29 if MYPY_CHECK_RUNNING:
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30 from typing import (
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31 Any, Dict, Iterable, List, NewType, Optional, Tuple
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32 )
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33
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34 RawConfigParser = configparser.RawConfigParser # Shorthand
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35 Kind = NewType("Kind", str)
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36
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37 logger = logging.getLogger(__name__)
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38
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39
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40 # NOTE: Maybe use the optionx attribute to normalize keynames.
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41 def _normalize_name(name):
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42 # type: (str) -> str
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43 """Make a name consistent regardless of source (environment or file)
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44 """
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45 name = name.lower().replace('_', '-')
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46 if name.startswith('--'):
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47 name = name[2:] # only prefer long opts
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48 return name
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49
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50
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51 def _disassemble_key(name):
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52 # type: (str) -> List[str]
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53 if "." not in name:
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54 error_message = (
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55 "Key does not contain dot separated section and key. "
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56 "Perhaps you wanted to use 'global.{}' instead?"
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57 ).format(name)
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58 raise ConfigurationError(error_message)
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59 return name.split(".", 1)
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60
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61
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62 # The kinds of configurations there are.
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63 kinds = enum(
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64 USER="user", # User Specific
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65 GLOBAL="global", # System Wide
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66 SITE="site", # [Virtual] Environment Specific
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67 ENV="env", # from PIP_CONFIG_FILE
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68 ENV_VAR="env-var", # from Environment Variables
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69 )
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70
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71
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72 CONFIG_BASENAME = 'pip.ini' if WINDOWS else 'pip.conf'
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73
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74
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75 def get_configuration_files():
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76 global_config_files = [
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77 os.path.join(path, CONFIG_BASENAME)
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78 for path in appdirs.site_config_dirs('pip')
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79 ]
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80
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81 site_config_file = os.path.join(sys.prefix, CONFIG_BASENAME)
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82 legacy_config_file = os.path.join(
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83 expanduser('~'),
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84 'pip' if WINDOWS else '.pip',
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85 CONFIG_BASENAME,
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86 )
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87 new_config_file = os.path.join(
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88 appdirs.user_config_dir("pip"), CONFIG_BASENAME
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89 )
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90 return {
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91 kinds.GLOBAL: global_config_files,
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92 kinds.SITE: [site_config_file],
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93 kinds.USER: [legacy_config_file, new_config_file],
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94 }
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95
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96
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97 class Configuration(object):
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98 """Handles management of configuration.
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99
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100 Provides an interface to accessing and managing configuration files.
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101
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102 This class converts provides an API that takes "section.key-name" style
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103 keys and stores the value associated with it as "key-name" under the
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104 section "section".
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105
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106 This allows for a clean interface wherein the both the section and the
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107 key-name are preserved in an easy to manage form in the configuration files
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108 and the data stored is also nice.
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109 """
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110
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111 def __init__(self, isolated, load_only=None):
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112 # type: (bool, Kind) -> None
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113 super(Configuration, self).__init__()
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114
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115 _valid_load_only = [kinds.USER, kinds.GLOBAL, kinds.SITE, None]
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116 if load_only not in _valid_load_only:
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117 raise ConfigurationError(
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118 "Got invalid value for load_only - should be one of {}".format(
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119 ", ".join(map(repr, _valid_load_only[:-1]))
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120 )
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121 )
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122 self.isolated = isolated # type: bool
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123 self.load_only = load_only # type: Optional[Kind]
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124
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125 # The order here determines the override order.
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126 self._override_order = [
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127 kinds.GLOBAL, kinds.USER, kinds.SITE, kinds.ENV, kinds.ENV_VAR
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128 ]
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129
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130 self._ignore_env_names = ["version", "help"]
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131
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132 # Because we keep track of where we got the data from
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133 self._parsers = {
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134 variant: [] for variant in self._override_order
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135 } # type: Dict[Kind, List[Tuple[str, RawConfigParser]]]
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136 self._config = {
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137 variant: {} for variant in self._override_order
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138 } # type: Dict[Kind, Dict[str, Any]]
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139 self._modified_parsers = [] # type: List[Tuple[str, RawConfigParser]]
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140
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141 def load(self):
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142 # type: () -> None
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143 """Loads configuration from configuration files and environment
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144 """
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145 self._load_config_files()
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146 if not self.isolated:
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147 self._load_environment_vars()
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148
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149 def get_file_to_edit(self):
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150 # type: () -> Optional[str]
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151 """Returns the file with highest priority in configuration
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152 """
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153 assert self.load_only is not None, \
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154 "Need to be specified a file to be editing"
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155
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156 try:
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157 return self._get_parser_to_modify()[0]
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158 except IndexError:
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159 return None
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160
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161 def items(self):
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162 # type: () -> Iterable[Tuple[str, Any]]
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163 """Returns key-value pairs like dict.items() representing the loaded
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164 configuration
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165 """
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166 return self._dictionary.items()
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167
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168 def get_value(self, key):
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169 # type: (str) -> Any
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170 """Get a value from the configuration.
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171 """
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172 try:
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173 return self._dictionary[key]
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174 except KeyError:
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175 raise ConfigurationError("No such key - {}".format(key))
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176
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177 def set_value(self, key, value):
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178 # type: (str, Any) -> None
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179 """Modify a value in the configuration.
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180 """
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181 self._ensure_have_load_only()
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182
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183 fname, parser = self._get_parser_to_modify()
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184
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185 if parser is not None:
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186 section, name = _disassemble_key(key)
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187
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188 # Modify the parser and the configuration
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189 if not parser.has_section(section):
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190 parser.add_section(section)
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191 parser.set(section, name, value)
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192
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193 self._config[self.load_only][key] = value
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194 self._mark_as_modified(fname, parser)
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195
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196 def unset_value(self, key):
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197 # type: (str) -> None
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198 """Unset a value in the configuration.
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199 """
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200 self._ensure_have_load_only()
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201
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202 if key not in self._config[self.load_only]:
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203 raise ConfigurationError("No such key - {}".format(key))
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204
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205 fname, parser = self._get_parser_to_modify()
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206
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207 if parser is not None:
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208 section, name = _disassemble_key(key)
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209
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210 # Remove the key in the parser
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211 modified_something = False
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212 if parser.has_section(section):
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213 # Returns whether the option was removed or not
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214 modified_something = parser.remove_option(section, name)
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215
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216 if modified_something:
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217 # name removed from parser, section may now be empty
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218 section_iter = iter(parser.items(section))
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219 try:
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220 val = next(section_iter)
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221 except StopIteration:
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222 val = None
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223
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224 if val is None:
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225 parser.remove_section(section)
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226
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227 self._mark_as_modified(fname, parser)
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228 else:
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229 raise ConfigurationError(
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230 "Fatal Internal error [id=1]. Please report as a bug."
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231 )
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232
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233 del self._config[self.load_only][key]
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234
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235 def save(self):
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236 # type: () -> None
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237 """Save the current in-memory state.
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238 """
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239 self._ensure_have_load_only()
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240
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241 for fname, parser in self._modified_parsers:
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242 logger.info("Writing to %s", fname)
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243
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244 # Ensure directory exists.
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245 ensure_dir(os.path.dirname(fname))
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246
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247 with open(fname, "w") as f:
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248 parser.write(f)
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249
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250 #
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251 # Private routines
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252 #
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253
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254 def _ensure_have_load_only(self):
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255 # type: () -> None
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256 if self.load_only is None:
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257 raise ConfigurationError("Needed a specific file to be modifying.")
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258 logger.debug("Will be working with %s variant only", self.load_only)
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259
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260 @property
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261 def _dictionary(self):
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262 # type: () -> Dict[str, Any]
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263 """A dictionary representing the loaded configuration.
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264 """
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265 # NOTE: Dictionaries are not populated if not loaded. So, conditionals
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266 # are not needed here.
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267 retval = {}
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268
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269 for variant in self._override_order:
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270 retval.update(self._config[variant])
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271
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272 return retval
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273
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274 def _load_config_files(self):
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275 # type: () -> None
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276 """Loads configuration from configuration files
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277 """
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278 config_files = dict(self._iter_config_files())
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279 if config_files[kinds.ENV][0:1] == [os.devnull]:
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280 logger.debug(
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281 "Skipping loading configuration files due to "
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282 "environment's PIP_CONFIG_FILE being os.devnull"
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283 )
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284 return
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285
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286 for variant, files in config_files.items():
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287 for fname in files:
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288 # If there's specific variant set in `load_only`, load only
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289 # that variant, not the others.
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290 if self.load_only is not None and variant != self.load_only:
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291 logger.debug(
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292 "Skipping file '%s' (variant: %s)", fname, variant
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293 )
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294 continue
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295
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296 parser = self._load_file(variant, fname)
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297
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298 # Keeping track of the parsers used
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299 self._parsers[variant].append((fname, parser))
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300
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301 def _load_file(self, variant, fname):
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302 # type: (Kind, str) -> RawConfigParser
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303 logger.debug("For variant '%s', will try loading '%s'", variant, fname)
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304 parser = self._construct_parser(fname)
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305
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306 for section in parser.sections():
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307 items = parser.items(section)
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308 self._config[variant].update(self._normalized_keys(section, items))
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309
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310 return parser
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311
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312 def _construct_parser(self, fname):
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313 # type: (str) -> RawConfigParser
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314 parser = configparser.RawConfigParser()
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315 # If there is no such file, don't bother reading it but create the
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316 # parser anyway, to hold the data.
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317 # Doing this is useful when modifying and saving files, where we don't
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318 # need to construct a parser.
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319 if os.path.exists(fname):
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320 try:
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321 parser.read(fname)
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322 except UnicodeDecodeError:
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323 # See https://github.com/pypa/pip/issues/4963
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324 raise ConfigurationFileCouldNotBeLoaded(
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325 reason="contains invalid {} characters".format(
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326 locale.getpreferredencoding(False)
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327 ),
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328 fname=fname,
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329 )
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330 except configparser.Error as error:
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331 # See https://github.com/pypa/pip/issues/4893
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332 raise ConfigurationFileCouldNotBeLoaded(error=error)
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333 return parser
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334
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335 def _load_environment_vars(self):
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336 # type: () -> None
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337 """Loads configuration from environment variables
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338 """
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339 self._config[kinds.ENV_VAR].update(
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340 self._normalized_keys(":env:", self._get_environ_vars())
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341 )
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342
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343 def _normalized_keys(self, section, items):
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344 # type: (str, Iterable[Tuple[str, Any]]) -> Dict[str, Any]
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345 """Normalizes items to construct a dictionary with normalized keys.
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346
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347 This routine is where the names become keys and are made the same
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348 regardless of source - configuration files or environment.
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349 """
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350 normalized = {}
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351 for name, val in items:
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352 key = section + "." + _normalize_name(name)
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353 normalized[key] = val
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354 return normalized
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355
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356 def _get_environ_vars(self):
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357 # type: () -> Iterable[Tuple[str, str]]
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358 """Returns a generator with all environmental vars with prefix PIP_"""
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359 for key, val in os.environ.items():
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360 should_be_yielded = (
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361 key.startswith("PIP_") and
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362 key[4:].lower() not in self._ignore_env_names
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363 )
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364 if should_be_yielded:
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365 yield key[4:].lower(), val
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366
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367 # XXX: This is patched in the tests.
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368 def _iter_config_files(self):
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369 # type: () -> Iterable[Tuple[Kind, List[str]]]
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370 """Yields variant and configuration files associated with it.
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371
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372 This should be treated like items of a dictionary.
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373 """
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374 # SMELL: Move the conditions out of this function
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375
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376 # environment variables have the lowest priority
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377 config_file = os.environ.get('PIP_CONFIG_FILE', None)
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378 if config_file is not None:
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379 yield kinds.ENV, [config_file]
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380 else:
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381 yield kinds.ENV, []
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382
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383 config_files = get_configuration_files()
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384
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385 # at the base we have any global configuration
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386 yield kinds.GLOBAL, config_files[kinds.GLOBAL]
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387
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388 # per-user configuration next
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389 should_load_user_config = not self.isolated and not (
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390 config_file and os.path.exists(config_file)
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391 )
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392 if should_load_user_config:
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393 # The legacy config file is overridden by the new config file
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394 yield kinds.USER, config_files[kinds.USER]
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395
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396 # finally virtualenv configuration first trumping others
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397 yield kinds.SITE, config_files[kinds.SITE]
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398
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399 def _get_parser_to_modify(self):
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400 # type: () -> Tuple[str, RawConfigParser]
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401 # Determine which parser to modify
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402 parsers = self._parsers[self.load_only]
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403 if not parsers:
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404 # This should not happen if everything works correctly.
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405 raise ConfigurationError(
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406 "Fatal Internal error [id=2]. Please report as a bug."
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407 )
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408
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409 # Use the highest priority parser.
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410 return parsers[-1]
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411
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412 # XXX: This is patched in the tests.
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413 def _mark_as_modified(self, fname, parser):
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414 # type: (str, RawConfigParser) -> None
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415 file_parser_tuple = (fname, parser)
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416 if file_parser_tuple not in self._modified_parsers:
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417 self._modified_parsers.append(file_parser_tuple)