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Dir : ~/lib/python3.9/site-packages/cockpit/

View File Name : config.py

#
# Copyright (C) 2023 Red Hat, Inc.
# SPDX-License-Identifier: GPL-3.0-or-later


import configparser
import logging
import os
from pathlib import Path

from cockpit._vendor.systemd_ctypes import bus

logger = logging.getLogger(__name__)

XDG_CONFIG_HOME = Path(os.getenv('XDG_CONFIG_HOME') or os.path.expanduser('~/.config'))
DOT_CONFIG_COCKPIT = XDG_CONFIG_HOME / 'cockpit'


def lookup_config(filename: str) -> Path:
    config_dirs = os.environ.get('XDG_CONFIG_DIRS', '/etc').split(':')
    fallback = None
    for config_dir in config_dirs:
        config_path = Path(config_dir, 'cockpit', filename)
        if not fallback:
            fallback = config_path
        if config_path.exists():
            logger.debug('lookup_config(%s): found %s', filename, config_path)
            return config_path

    # default to the first entry in XDG_CONFIG_DIRS; that's not according to the spec,
    # but what Cockpit has done for years
    logger.debug('lookup_config(%s): defaulting to %s', filename, fallback)
    assert fallback  # mypy; config_dirs always has at least one string
    return fallback


class Config(bus.Object, interface='cockpit.Config'):
    def __init__(self) -> None:
        self.reload()

    @bus.Interface.Method(out_types='s', in_types='ss')
    def get_string(self, section: str, key: str) -> str:
        try:
            return self.config[section][key]
        except KeyError as exc:
            raise bus.BusError('cockpit.Config.KeyError', f'key {key} in section {section} does not exist') from exc

    @bus.Interface.Method(out_types='u', in_types='ssuuu')
    def get_u_int(self, section: str, key: str, default: int, maximum: int, minimum: int) -> int:
        try:
            value = self.config[section][key]
        except KeyError:
            return default

        try:
            int_val = int(value)
        except ValueError:
            logger.warning('cockpit.conf: [%s] %s is not an integer', section, key)
            return default

        return min(max(int_val, minimum), maximum)

    @bus.Interface.Method()
    def reload(self) -> None:
        self.config = configparser.ConfigParser(interpolation=None)
        cockpit_conf = lookup_config('cockpit.conf')
        logger.debug("cockpit.Config: loading %s", cockpit_conf)
        # this may not exist, but it's ok to not have a config file and thus leave self.config empty
        try:
            self.config.read(cockpit_conf)
        except configparser.Error as exc:
            logger.warning("cockpit.conf is invalid: %s", exc)
            self.config.clear()
            return


class Environment(bus.Object, interface='cockpit.Environment'):
    variables = bus.Interface.Property('a{ss}')

    @variables.getter
    def get_variables(self) -> 'dict[str, str]':
        return os.environ.copy()