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9 9li~ e8EpOe1h hai~ e8EpOe1h 9auto # ;lY>d n-jvOe1h M8 8} ;# # Copyright (c) 2018 Red Hat, Inc. # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License # as published by the Free Software Foundation; either version 2 # of the License, or (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA # 02110-1301, USA. # """ Configuration - VDO manager configuration file handling $Id: //eng/vdo-releases/magnesium/src/python/vdo/vdomgmnt/Configuration.py#7 $ """ from . import ArgumentError, MgmntLogger from . import StateExitStatus from . import VDOService from utils import Command, runCommand from utils import FileLock, YAMLObject import errno import os from stat import ST_MTIME import time import yaml class BadConfigurationFileError(StateExitStatus, Exception): """Exception raised to indicate an error in processing the configuration file, such as a parse error or missing data. """ ###################################################################### # Overridden methods ###################################################################### def __init__(self, msg, *args, **kwargs): super(BadConfigurationFileError, self).__init__(*args, **kwargs) self._msg = msg ###################################################################### def __str__(self): return self._msg ######################################################################## class Configuration(YAMLObject): """Configuration of VDO volumes and associated Albireo servers. This class is designed for use with the "with" statement. If Command.noRunMode is True, the file will still be opened and read but writes will not be performed. The Configuration is stored in a simple XML format; see vdoconfig.dtd. Attributes: _vdos: A dictionary of VDOServices, indexed by name. _filename: The name of the configuration file. _readonly: True iff this Configuration is read-only. _dirty: True iff this Configuration has been modified but the changes have not been persisted. _mustExist: If True, the file must exist (otherwise a missing file is treated as an empty configuration). """ log = MgmntLogger.getLogger(MgmntLogger.myname + '.Configuration') supportedSchemaVersions = [0x20170907] modifiableSingltons = {} singletonLock = '/var/lock/vdo-config-singletons' yaml_tag = u"!Configuration" ###################################################################### # Public methods ###################################################################### @classmethod def modifiableSingleton(cls, filepath): """Allocates, as necessary, and returns a modifiable, singleton Configuration instance for the specified filepath. Separate entities can thus share one in memory copy of the configuration file allowing for encapsulation of per-entity manipulation of the configuration. Args: filepath (str): path to config file """ config = None with FileLock(cls.singletonLock, "r+") as f: config = cls.modifiableSingltons.get(filepath) if config is None: config = Configuration(filepath, readonly = Fals