forked from varia/varia.website
375 lines
13 KiB
Python
375 lines
13 KiB
Python
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"""Configuration management setup
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Some terminology:
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- name
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As written in config files.
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- value
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Value associated with a name
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- key
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Name combined with it's section (section.name)
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- variant
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A single word describing where the configuration key-value pair came from
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"""
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import configparser
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import locale
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import os
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import sys
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from typing import Any, Dict, Iterable, List, NewType, Optional, Tuple
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from pip._internal.exceptions import (
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ConfigurationError,
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ConfigurationFileCouldNotBeLoaded,
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)
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from pip._internal.utils import appdirs
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from pip._internal.utils.compat import WINDOWS
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from pip._internal.utils.logging import getLogger
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from pip._internal.utils.misc import ensure_dir, enum
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RawConfigParser = configparser.RawConfigParser # Shorthand
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Kind = NewType("Kind", str)
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CONFIG_BASENAME = "pip.ini" if WINDOWS else "pip.conf"
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ENV_NAMES_IGNORED = "version", "help"
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# The kinds of configurations there are.
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kinds = enum(
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USER="user", # User Specific
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GLOBAL="global", # System Wide
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SITE="site", # [Virtual] Environment Specific
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ENV="env", # from PIP_CONFIG_FILE
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ENV_VAR="env-var", # from Environment Variables
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)
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OVERRIDE_ORDER = kinds.GLOBAL, kinds.USER, kinds.SITE, kinds.ENV, kinds.ENV_VAR
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VALID_LOAD_ONLY = kinds.USER, kinds.GLOBAL, kinds.SITE
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logger = getLogger(__name__)
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# NOTE: Maybe use the optionx attribute to normalize keynames.
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def _normalize_name(name: str) -> str:
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"""Make a name consistent regardless of source (environment or file)"""
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name = name.lower().replace("_", "-")
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if name.startswith("--"):
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name = name[2:] # only prefer long opts
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return name
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def _disassemble_key(name: str) -> List[str]:
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if "." not in name:
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error_message = (
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"Key does not contain dot separated section and key. "
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"Perhaps you wanted to use 'global.{}' instead?"
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).format(name)
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raise ConfigurationError(error_message)
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return name.split(".", 1)
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def get_configuration_files() -> Dict[Kind, List[str]]:
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global_config_files = [
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os.path.join(path, CONFIG_BASENAME) for path in appdirs.site_config_dirs("pip")
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]
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site_config_file = os.path.join(sys.prefix, CONFIG_BASENAME)
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legacy_config_file = os.path.join(
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os.path.expanduser("~"),
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"pip" if WINDOWS else ".pip",
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CONFIG_BASENAME,
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)
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new_config_file = os.path.join(appdirs.user_config_dir("pip"), CONFIG_BASENAME)
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return {
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kinds.GLOBAL: global_config_files,
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kinds.SITE: [site_config_file],
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kinds.USER: [legacy_config_file, new_config_file],
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}
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class Configuration:
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"""Handles management of configuration.
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Provides an interface to accessing and managing configuration files.
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This class converts provides an API that takes "section.key-name" style
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keys and stores the value associated with it as "key-name" under the
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section "section".
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This allows for a clean interface wherein the both the section and the
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key-name are preserved in an easy to manage form in the configuration files
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and the data stored is also nice.
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"""
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def __init__(self, isolated: bool, load_only: Optional[Kind] = None) -> None:
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super().__init__()
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if load_only is not None and load_only not in VALID_LOAD_ONLY:
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raise ConfigurationError(
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"Got invalid value for load_only - should be one of {}".format(
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", ".join(map(repr, VALID_LOAD_ONLY))
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)
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)
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self.isolated = isolated
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self.load_only = load_only
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# Because we keep track of where we got the data from
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self._parsers: Dict[Kind, List[Tuple[str, RawConfigParser]]] = {
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variant: [] for variant in OVERRIDE_ORDER
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}
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self._config: Dict[Kind, Dict[str, Any]] = {
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variant: {} for variant in OVERRIDE_ORDER
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}
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self._modified_parsers: List[Tuple[str, RawConfigParser]] = []
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def load(self) -> None:
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"""Loads configuration from configuration files and environment"""
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self._load_config_files()
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if not self.isolated:
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self._load_environment_vars()
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def get_file_to_edit(self) -> Optional[str]:
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"""Returns the file with highest priority in configuration"""
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assert self.load_only is not None, "Need to be specified a file to be editing"
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try:
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return self._get_parser_to_modify()[0]
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except IndexError:
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return None
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def items(self) -> Iterable[Tuple[str, Any]]:
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"""Returns key-value pairs like dict.items() representing the loaded
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configuration
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"""
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return self._dictionary.items()
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def get_value(self, key: str) -> Any:
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"""Get a value from the configuration."""
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orig_key = key
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key = _normalize_name(key)
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try:
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return self._dictionary[key]
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except KeyError:
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# disassembling triggers a more useful error message than simply
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# "No such key" in the case that the key isn't in the form command.option
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_disassemble_key(key)
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raise ConfigurationError(f"No such key - {orig_key}")
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def set_value(self, key: str, value: Any) -> None:
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"""Modify a value in the configuration."""
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key = _normalize_name(key)
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self._ensure_have_load_only()
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assert self.load_only
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fname, parser = self._get_parser_to_modify()
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if parser is not None:
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section, name = _disassemble_key(key)
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# Modify the parser and the configuration
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if not parser.has_section(section):
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parser.add_section(section)
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parser.set(section, name, value)
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self._config[self.load_only][key] = value
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self._mark_as_modified(fname, parser)
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def unset_value(self, key: str) -> None:
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"""Unset a value in the configuration."""
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orig_key = key
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key = _normalize_name(key)
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self._ensure_have_load_only()
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assert self.load_only
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if key not in self._config[self.load_only]:
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raise ConfigurationError(f"No such key - {orig_key}")
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fname, parser = self._get_parser_to_modify()
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if parser is not None:
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section, name = _disassemble_key(key)
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if not (
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parser.has_section(section) and parser.remove_option(section, name)
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):
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# The option was not removed.
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raise ConfigurationError(
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"Fatal Internal error [id=1]. Please report as a bug."
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)
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# The section may be empty after the option was removed.
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if not parser.items(section):
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parser.remove_section(section)
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self._mark_as_modified(fname, parser)
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del self._config[self.load_only][key]
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def save(self) -> None:
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"""Save the current in-memory state."""
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self._ensure_have_load_only()
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for fname, parser in self._modified_parsers:
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logger.info("Writing to %s", fname)
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# Ensure directory exists.
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ensure_dir(os.path.dirname(fname))
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with open(fname, "w") as f:
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parser.write(f)
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#
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# Private routines
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#
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def _ensure_have_load_only(self) -> None:
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if self.load_only is None:
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raise ConfigurationError("Needed a specific file to be modifying.")
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logger.debug("Will be working with %s variant only", self.load_only)
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@property
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def _dictionary(self) -> Dict[str, Any]:
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"""A dictionary representing the loaded configuration."""
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# NOTE: Dictionaries are not populated if not loaded. So, conditionals
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# are not needed here.
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retval = {}
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for variant in OVERRIDE_ORDER:
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retval.update(self._config[variant])
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return retval
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def _load_config_files(self) -> None:
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"""Loads configuration from configuration files"""
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config_files = dict(self.iter_config_files())
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if config_files[kinds.ENV][0:1] == [os.devnull]:
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logger.debug(
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"Skipping loading configuration files due to "
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"environment's PIP_CONFIG_FILE being os.devnull"
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)
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return
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for variant, files in config_files.items():
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for fname in files:
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# If there's specific variant set in `load_only`, load only
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# that variant, not the others.
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if self.load_only is not None and variant != self.load_only:
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logger.debug("Skipping file '%s' (variant: %s)", fname, variant)
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continue
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parser = self._load_file(variant, fname)
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# Keeping track of the parsers used
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self._parsers[variant].append((fname, parser))
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def _load_file(self, variant: Kind, fname: str) -> RawConfigParser:
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logger.verbose("For variant '%s', will try loading '%s'", variant, fname)
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parser = self._construct_parser(fname)
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for section in parser.sections():
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items = parser.items(section)
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self._config[variant].update(self._normalized_keys(section, items))
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return parser
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def _construct_parser(self, fname: str) -> RawConfigParser:
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parser = configparser.RawConfigParser()
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# If there is no such file, don't bother reading it but create the
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# parser anyway, to hold the data.
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# Doing this is useful when modifying and saving files, where we don't
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# need to construct a parser.
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if os.path.exists(fname):
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locale_encoding = locale.getpreferredencoding(False)
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try:
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parser.read(fname, encoding=locale_encoding)
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except UnicodeDecodeError:
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# See https://github.com/pypa/pip/issues/4963
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raise ConfigurationFileCouldNotBeLoaded(
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reason=f"contains invalid {locale_encoding} characters",
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fname=fname,
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)
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except configparser.Error as error:
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# See https://github.com/pypa/pip/issues/4893
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raise ConfigurationFileCouldNotBeLoaded(error=error)
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return parser
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def _load_environment_vars(self) -> None:
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"""Loads configuration from environment variables"""
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self._config[kinds.ENV_VAR].update(
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self._normalized_keys(":env:", self.get_environ_vars())
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)
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def _normalized_keys(
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self, section: str, items: Iterable[Tuple[str, Any]]
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) -> Dict[str, Any]:
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"""Normalizes items to construct a dictionary with normalized keys.
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This routine is where the names become keys and are made the same
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regardless of source - configuration files or environment.
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"""
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normalized = {}
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for name, val in items:
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key = section + "." + _normalize_name(name)
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normalized[key] = val
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return normalized
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def get_environ_vars(self) -> Iterable[Tuple[str, str]]:
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"""Returns a generator with all environmental vars with prefix PIP_"""
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for key, val in os.environ.items():
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if key.startswith("PIP_"):
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name = key[4:].lower()
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if name not in ENV_NAMES_IGNORED:
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yield name, val
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# XXX: This is patched in the tests.
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def iter_config_files(self) -> Iterable[Tuple[Kind, List[str]]]:
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"""Yields variant and configuration files associated with it.
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This should be treated like items of a dictionary.
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"""
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# SMELL: Move the conditions out of this function
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# environment variables have the lowest priority
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config_file = os.environ.get("PIP_CONFIG_FILE", None)
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if config_file is not None:
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yield kinds.ENV, [config_file]
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else:
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yield kinds.ENV, []
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config_files = get_configuration_files()
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# at the base we have any global configuration
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yield kinds.GLOBAL, config_files[kinds.GLOBAL]
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# per-user configuration next
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should_load_user_config = not self.isolated and not (
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config_file and os.path.exists(config_file)
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)
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if should_load_user_config:
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# The legacy config file is overridden by the new config file
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yield kinds.USER, config_files[kinds.USER]
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# finally virtualenv configuration first trumping others
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yield kinds.SITE, config_files[kinds.SITE]
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def get_values_in_config(self, variant: Kind) -> Dict[str, Any]:
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"""Get values present in a config file"""
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return self._config[variant]
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def _get_parser_to_modify(self) -> Tuple[str, RawConfigParser]:
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# Determine which parser to modify
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assert self.load_only
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parsers = self._parsers[self.load_only]
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if not parsers:
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# This should not happen if everything works correctly.
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raise ConfigurationError(
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"Fatal Internal error [id=2]. Please report as a bug."
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)
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# Use the highest priority parser.
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return parsers[-1]
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# XXX: This is patched in the tests.
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def _mark_as_modified(self, fname: str, parser: RawConfigParser) -> None:
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file_parser_tuple = (fname, parser)
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if file_parser_tuple not in self._modified_parsers:
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self._modified_parsers.append(file_parser_tuple)
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def __repr__(self) -> str:
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return f"{self.__class__.__name__}({self._dictionary!r})"
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