Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/pip/_internal/configuration.py: 25%
178 statements
« prev ^ index » next coverage.py v7.2.7, created at 2023-06-07 06:48 +0000
1"""Configuration management setup
3Some terminology:
4- name
5 As written in config files.
6- value
7 Value associated with a name
8- key
9 Name combined with it's section (section.name)
10- variant
11 A single word describing where the configuration key-value pair came from
12"""
14import configparser
15import locale
16import os
17import sys
18from typing import Any, Dict, Iterable, List, NewType, Optional, Tuple
20from pip._internal.exceptions import (
21 ConfigurationError,
22 ConfigurationFileCouldNotBeLoaded,
23)
24from pip._internal.utils import appdirs
25from pip._internal.utils.compat import WINDOWS
26from pip._internal.utils.logging import getLogger
27from pip._internal.utils.misc import ensure_dir, enum
29RawConfigParser = configparser.RawConfigParser # Shorthand
30Kind = NewType("Kind", str)
32CONFIG_BASENAME = "pip.ini" if WINDOWS else "pip.conf"
33ENV_NAMES_IGNORED = "version", "help"
35# The kinds of configurations there are.
36kinds = enum(
37 USER="user", # User Specific
38 GLOBAL="global", # System Wide
39 SITE="site", # [Virtual] Environment Specific
40 ENV="env", # from PIP_CONFIG_FILE
41 ENV_VAR="env-var", # from Environment Variables
42)
43OVERRIDE_ORDER = kinds.GLOBAL, kinds.USER, kinds.SITE, kinds.ENV, kinds.ENV_VAR
44VALID_LOAD_ONLY = kinds.USER, kinds.GLOBAL, kinds.SITE
46logger = getLogger(__name__)
49# NOTE: Maybe use the optionx attribute to normalize keynames.
50def _normalize_name(name: str) -> str:
51 """Make a name consistent regardless of source (environment or file)"""
52 name = name.lower().replace("_", "-")
53 if name.startswith("--"):
54 name = name[2:] # only prefer long opts
55 return name
58def _disassemble_key(name: str) -> List[str]:
59 if "." not in name:
60 error_message = (
61 "Key does not contain dot separated section and key. "
62 "Perhaps you wanted to use 'global.{}' instead?"
63 ).format(name)
64 raise ConfigurationError(error_message)
65 return name.split(".", 1)
68def get_configuration_files() -> Dict[Kind, List[str]]:
69 global_config_files = [
70 os.path.join(path, CONFIG_BASENAME) for path in appdirs.site_config_dirs("pip")
71 ]
73 site_config_file = os.path.join(sys.prefix, CONFIG_BASENAME)
74 legacy_config_file = os.path.join(
75 os.path.expanduser("~"),
76 "pip" if WINDOWS else ".pip",
77 CONFIG_BASENAME,
78 )
79 new_config_file = os.path.join(appdirs.user_config_dir("pip"), CONFIG_BASENAME)
80 return {
81 kinds.GLOBAL: global_config_files,
82 kinds.SITE: [site_config_file],
83 kinds.USER: [legacy_config_file, new_config_file],
84 }
87class Configuration:
88 """Handles management of configuration.
90 Provides an interface to accessing and managing configuration files.
92 This class converts provides an API that takes "section.key-name" style
93 keys and stores the value associated with it as "key-name" under the
94 section "section".
96 This allows for a clean interface wherein the both the section and the
97 key-name are preserved in an easy to manage form in the configuration files
98 and the data stored is also nice.
99 """
101 def __init__(self, isolated: bool, load_only: Optional[Kind] = None) -> None:
102 super().__init__()
104 if load_only is not None and load_only not in VALID_LOAD_ONLY:
105 raise ConfigurationError(
106 "Got invalid value for load_only - should be one of {}".format(
107 ", ".join(map(repr, VALID_LOAD_ONLY))
108 )
109 )
110 self.isolated = isolated
111 self.load_only = load_only
113 # Because we keep track of where we got the data from
114 self._parsers: Dict[Kind, List[Tuple[str, RawConfigParser]]] = {
115 variant: [] for variant in OVERRIDE_ORDER
116 }
117 self._config: Dict[Kind, Dict[str, Any]] = {
118 variant: {} for variant in OVERRIDE_ORDER
119 }
120 self._modified_parsers: List[Tuple[str, RawConfigParser]] = []
122 def load(self) -> None:
123 """Loads configuration from configuration files and environment"""
124 self._load_config_files()
125 if not self.isolated:
126 self._load_environment_vars()
128 def get_file_to_edit(self) -> Optional[str]:
129 """Returns the file with highest priority in configuration"""
130 assert self.load_only is not None, "Need to be specified a file to be editing"
132 try:
133 return self._get_parser_to_modify()[0]
134 except IndexError:
135 return None
137 def items(self) -> Iterable[Tuple[str, Any]]:
138 """Returns key-value pairs like dict.items() representing the loaded
139 configuration
140 """
141 return self._dictionary.items()
143 def get_value(self, key: str) -> Any:
144 """Get a value from the configuration."""
145 orig_key = key
146 key = _normalize_name(key)
147 try:
148 return self._dictionary[key]
149 except KeyError:
150 # disassembling triggers a more useful error message than simply
151 # "No such key" in the case that the key isn't in the form command.option
152 _disassemble_key(key)
153 raise ConfigurationError(f"No such key - {orig_key}")
155 def set_value(self, key: str, value: Any) -> None:
156 """Modify a value in the configuration."""
157 key = _normalize_name(key)
158 self._ensure_have_load_only()
160 assert self.load_only
161 fname, parser = self._get_parser_to_modify()
163 if parser is not None:
164 section, name = _disassemble_key(key)
166 # Modify the parser and the configuration
167 if not parser.has_section(section):
168 parser.add_section(section)
169 parser.set(section, name, value)
171 self._config[self.load_only][key] = value
172 self._mark_as_modified(fname, parser)
174 def unset_value(self, key: str) -> None:
175 """Unset a value in the configuration."""
176 orig_key = key
177 key = _normalize_name(key)
178 self._ensure_have_load_only()
180 assert self.load_only
181 if key not in self._config[self.load_only]:
182 raise ConfigurationError(f"No such key - {orig_key}")
184 fname, parser = self._get_parser_to_modify()
186 if parser is not None:
187 section, name = _disassemble_key(key)
188 if not (
189 parser.has_section(section) and parser.remove_option(section, name)
190 ):
191 # The option was not removed.
192 raise ConfigurationError(
193 "Fatal Internal error [id=1]. Please report as a bug."
194 )
196 # The section may be empty after the option was removed.
197 if not parser.items(section):
198 parser.remove_section(section)
199 self._mark_as_modified(fname, parser)
201 del self._config[self.load_only][key]
203 def save(self) -> None:
204 """Save the current in-memory state."""
205 self._ensure_have_load_only()
207 for fname, parser in self._modified_parsers:
208 logger.info("Writing to %s", fname)
210 # Ensure directory exists.
211 ensure_dir(os.path.dirname(fname))
213 with open(fname, "w") as f:
214 parser.write(f)
216 #
217 # Private routines
218 #
220 def _ensure_have_load_only(self) -> None:
221 if self.load_only is None:
222 raise ConfigurationError("Needed a specific file to be modifying.")
223 logger.debug("Will be working with %s variant only", self.load_only)
225 @property
226 def _dictionary(self) -> Dict[str, Any]:
227 """A dictionary representing the loaded configuration."""
228 # NOTE: Dictionaries are not populated if not loaded. So, conditionals
229 # are not needed here.
230 retval = {}
232 for variant in OVERRIDE_ORDER:
233 retval.update(self._config[variant])
235 return retval
237 def _load_config_files(self) -> None:
238 """Loads configuration from configuration files"""
239 config_files = dict(self.iter_config_files())
240 if config_files[kinds.ENV][0:1] == [os.devnull]:
241 logger.debug(
242 "Skipping loading configuration files due to "
243 "environment's PIP_CONFIG_FILE being os.devnull"
244 )
245 return
247 for variant, files in config_files.items():
248 for fname in files:
249 # If there's specific variant set in `load_only`, load only
250 # that variant, not the others.
251 if self.load_only is not None and variant != self.load_only:
252 logger.debug("Skipping file '%s' (variant: %s)", fname, variant)
253 continue
255 parser = self._load_file(variant, fname)
257 # Keeping track of the parsers used
258 self._parsers[variant].append((fname, parser))
260 def _load_file(self, variant: Kind, fname: str) -> RawConfigParser:
261 logger.verbose("For variant '%s', will try loading '%s'", variant, fname)
262 parser = self._construct_parser(fname)
264 for section in parser.sections():
265 items = parser.items(section)
266 self._config[variant].update(self._normalized_keys(section, items))
268 return parser
270 def _construct_parser(self, fname: str) -> RawConfigParser:
271 parser = configparser.RawConfigParser()
272 # If there is no such file, don't bother reading it but create the
273 # parser anyway, to hold the data.
274 # Doing this is useful when modifying and saving files, where we don't
275 # need to construct a parser.
276 if os.path.exists(fname):
277 locale_encoding = locale.getpreferredencoding(False)
278 try:
279 parser.read(fname, encoding=locale_encoding)
280 except UnicodeDecodeError:
281 # See https://github.com/pypa/pip/issues/4963
282 raise ConfigurationFileCouldNotBeLoaded(
283 reason=f"contains invalid {locale_encoding} characters",
284 fname=fname,
285 )
286 except configparser.Error as error:
287 # See https://github.com/pypa/pip/issues/4893
288 raise ConfigurationFileCouldNotBeLoaded(error=error)
289 return parser
291 def _load_environment_vars(self) -> None:
292 """Loads configuration from environment variables"""
293 self._config[kinds.ENV_VAR].update(
294 self._normalized_keys(":env:", self.get_environ_vars())
295 )
297 def _normalized_keys(
298 self, section: str, items: Iterable[Tuple[str, Any]]
299 ) -> Dict[str, Any]:
300 """Normalizes items to construct a dictionary with normalized keys.
302 This routine is where the names become keys and are made the same
303 regardless of source - configuration files or environment.
304 """
305 normalized = {}
306 for name, val in items:
307 key = section + "." + _normalize_name(name)
308 normalized[key] = val
309 return normalized
311 def get_environ_vars(self) -> Iterable[Tuple[str, str]]:
312 """Returns a generator with all environmental vars with prefix PIP_"""
313 for key, val in os.environ.items():
314 if key.startswith("PIP_"):
315 name = key[4:].lower()
316 if name not in ENV_NAMES_IGNORED:
317 yield name, val
319 # XXX: This is patched in the tests.
320 def iter_config_files(self) -> Iterable[Tuple[Kind, List[str]]]:
321 """Yields variant and configuration files associated with it.
323 This should be treated like items of a dictionary.
324 """
325 # SMELL: Move the conditions out of this function
327 # environment variables have the lowest priority
328 config_file = os.environ.get("PIP_CONFIG_FILE", None)
329 if config_file is not None:
330 yield kinds.ENV, [config_file]
331 else:
332 yield kinds.ENV, []
334 config_files = get_configuration_files()
336 # at the base we have any global configuration
337 yield kinds.GLOBAL, config_files[kinds.GLOBAL]
339 # per-user configuration next
340 should_load_user_config = not self.isolated and not (
341 config_file and os.path.exists(config_file)
342 )
343 if should_load_user_config:
344 # The legacy config file is overridden by the new config file
345 yield kinds.USER, config_files[kinds.USER]
347 # finally virtualenv configuration first trumping others
348 yield kinds.SITE, config_files[kinds.SITE]
350 def get_values_in_config(self, variant: Kind) -> Dict[str, Any]:
351 """Get values present in a config file"""
352 return self._config[variant]
354 def _get_parser_to_modify(self) -> Tuple[str, RawConfigParser]:
355 # Determine which parser to modify
356 assert self.load_only
357 parsers = self._parsers[self.load_only]
358 if not parsers:
359 # This should not happen if everything works correctly.
360 raise ConfigurationError(
361 "Fatal Internal error [id=2]. Please report as a bug."
362 )
364 # Use the highest priority parser.
365 return parsers[-1]
367 # XXX: This is patched in the tests.
368 def _mark_as_modified(self, fname: str, parser: RawConfigParser) -> None:
369 file_parser_tuple = (fname, parser)
370 if file_parser_tuple not in self._modified_parsers:
371 self._modified_parsers.append(file_parser_tuple)
373 def __repr__(self) -> str:
374 return f"{self.__class__.__name__}({self._dictionary!r})"