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Direktori : /lib/python2.7/site-packages/yum/ |
Current File : //lib/python2.7/site-packages/yum/plugins.py |
#! /usr/bin/python -tt # 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 Library 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. # Copyright 2005 Duke University import os import glob import imp import warnings import atexit import gettext import logging import logginglevels from constants import * import config from config import ParsingError, ConfigParser import Errors from parser import ConfigPreProcessor from textwrap import fill import fnmatch from weakref import proxy as weakref from yum import _ from yum.i18n import utf8_width # TODO: expose rpm package sack objects to plugins (once finished) # TODO: allow plugins to use the existing config stuff to define options for # their own configuration files (would replace confString() etc). # TODO: expose progress bar interface # TODO "log" slot? To allow plugins to do customised logging/history (say to a # SQL db) # TODO: consistent case of YumPlugins methods # TODO: allow plugins to extend shell commands # TODO: allow plugins to define new repository types # TODO: More developer docs: use epydoc as API begins to stablise # The API_VERSION constant defines the current plugin API version. It is used # to decided whether or not plugins can be loaded. It is compared against the # 'requires_api_version' attribute of each plugin. The version number has the # format: "major_version.minor_version". # # For a plugin to be loaded the major version required by the plugin must match # the major version in API_VERSION. Additionally, the minor version in # API_VERSION must be greater than or equal the minor version required by the # plugin. # # If a change to yum is made that break backwards compatibility wrt the plugin # API, the major version number must be incremented and the minor version number # reset to 0. If a change is made that doesn't break backwards compatibility, # then the minor number must be incremented. API_VERSION = '2.7' class DeprecatedInt(int): """A simple int subclass that is used to check when a deprecated constant is used. """ # Plugin types TYPE_CORE = 0 TYPE_INTERACTIVE = 1 TYPE_INTERFACE = DeprecatedInt(1) ALL_TYPES = (TYPE_CORE, TYPE_INTERACTIVE) # Mapping of slots to conduit classes SLOT_TO_CONDUIT = { 'config': 'ConfigPluginConduit', 'postconfig': 'PostConfigPluginConduit', 'init': 'InitPluginConduit', 'args': 'ArgsPluginConduit', 'predownload': 'DownloadPluginConduit', 'postdownload': 'DownloadPluginConduit', 'prelistenabledrepos': 'PreRepoSetupPluginConduit', 'prereposetup': 'PreRepoSetupPluginConduit', 'postreposetup': 'PostRepoSetupPluginConduit', 'close': 'PluginConduit', 'clean': 'PluginConduit', 'pretrans': 'MainPluginConduit', 'posttrans': 'MainPluginConduit', 'preverifytrans': 'MainPluginConduit', 'postverifytrans': 'MainPluginConduit', 'exclude': 'MainPluginConduit', 'preresolve': 'DepsolvePluginConduit', 'postresolve': 'DepsolvePluginConduit', 'historybegin': 'HistoryPluginConduit', 'historyend': 'HistoryPluginConduit', 'compare_providers': 'CompareProvidersPluginConduit', 'verify_package': 'VerifyPluginConduit', } # Enumerate all slot names SLOTS = sorted(SLOT_TO_CONDUIT.keys()) class PluginYumExit(Exception): """Exception that can be raised by plugins to signal that yum should stop.""" def __init__(self, value="", translation_domain=""): self.value = value self.translation_domain = translation_domain def __str__(self): if self.translation_domain: return gettext.dgettext(self.translation_domain, self.value) else: return self.value class YumPlugins: """Manager class for Yum plugins.""" def __init__(self, base, searchpath, optparser=None, types=None, pluginconfpath=None,disabled=None,enabled=None): '''Initialise the instance. @param base: The @param searchpath: A list of paths to look for plugin modules. @param optparser: The OptionParser instance for this run (optional). Use to allow plugins to extend command line options. @param types: A sequence specifying the types of plugins to load. This should be sequnce containing one or more of the TYPE_... constants. If None (the default), all plugins will be loaded. @param pluginconfpath: A list of paths to look for plugin configuration files. Defaults to "/etc/yum/pluginconf.d". ''' if not pluginconfpath: pluginconfpath = ['/etc/yum/pluginconf.d'] self.searchpath = searchpath self.pluginconfpath = pluginconfpath self.base = weakref(base) self.optparser = optparser self.cmdline = (None, None) self.verbose_logger = logging.getLogger("yum.verbose.YumPlugins") self.disabledPlugins = disabled self.enabledPlugins = enabled if types is None: types = ALL_TYPES if not isinstance(types, (list, tuple)): types = (types,) if id(TYPE_INTERFACE) in [id(t) for t in types]: self.verbose_logger.log(logginglevels.INFO_2, 'Deprecated constant TYPE_INTERFACE during plugin ' 'initialization.\nPlease use TYPE_INTERACTIVE instead.') self._importplugins(types) self.cmdlines = {} # Call close handlers when yum exit's atexit.register(self.run, 'close') # Let plugins register custom config file options self.run('config') def run(self, slotname, **kwargs): """Run all plugin functions for the given slot. :param slotname: a string representing the name of the slot to run the plugins for :param kwargs: keyword arguments that will be simply passed on to the plugins """ # Determine handler class to use conduitcls = SLOT_TO_CONDUIT.get(slotname, None) if conduitcls is None: raise ValueError('unknown slot name "%s"' % slotname) conduitcls = eval(conduitcls) # Convert name to class object for modname, func in self._pluginfuncs[slotname]: self.verbose_logger.log(logginglevels.DEBUG_4, 'Running "%s" handler for "%s" plugin', slotname, modname) _, conf = self._plugins[modname] func(conduitcls(self, self.base, conf, **kwargs)) def _importplugins(self, types): '''Load plugins matching the given types. ''' # Initialise plugin dict self._plugins = {} self._pluginfuncs = {} for slot in SLOTS: self._pluginfuncs[slot] = [] # Import plugins self._used_disable_plugin = set() self._used_enable_plugin = set() for dir in self.searchpath: if not os.path.isdir(dir): continue for modulefile in sorted(glob.glob('%s/*.py' % dir)): self._loadplugin(modulefile, types) # If we are in verbose mode we get the full 'Loading "blah" plugin' lines if (self._plugins and not self.verbose_logger.isEnabledFor(logginglevels.DEBUG_3)): # Mostly copied from YumOutput._outKeyValFill() key = _("Loaded plugins: ") val = ", ".join(sorted(self._plugins)) nxt = ' ' * (utf8_width(key) - 2) + ': ' width = 80 if hasattr(self.base, 'term'): width = self.base.term.columns self.verbose_logger.log(logginglevels.INFO_2, fill(val, width=width, initial_indent=key, subsequent_indent=nxt)) if self.disabledPlugins: for wc in self.disabledPlugins: if wc not in self._used_disable_plugin: self.verbose_logger.log(logginglevels.INFO_2, _("No plugin match for: %s") % wc) del self._used_disable_plugin if self.enabledPlugins: for wc in self.enabledPlugins: if wc not in self._used_enable_plugin: self.verbose_logger.log(logginglevels.INFO_2, _("No plugin match for: %s") % wc) del self._used_enable_plugin @staticmethod def _plugin_cmdline_match(modname, plugins, used): """ Check if this plugin has been temporary enabled/disabled. """ if plugins is None: return False for wc in plugins: if fnmatch.fnmatch(modname, wc): used.add(wc) return True return False def _loadplugin(self, modulefile, types): '''Attempt to import a plugin module and register the hook methods it uses. ''' dir, modname = os.path.split(modulefile) modname = modname.split('.py')[0] # This should really work like enable/disable repo. and be based on the # cmd line order ... but the API doesn't really allow that easily. # FIXME: Fix for 4.* (lol) # Do disabled cmd line checks before loading the module code. if (self._plugin_cmdline_match(modname, self.disabledPlugins, self._used_disable_plugin) and not self._plugin_cmdline_match(modname, self.enabledPlugins, self._used_enable_plugin)): return conf = self._getpluginconf(modname) if (not conf or (not config.getOption(conf, 'main', 'enabled', config.BoolOption(False)) and not self._plugin_cmdline_match(modname, self.enabledPlugins, self._used_enable_plugin))): self.verbose_logger.debug(_('Not loading "%s" plugin, as it is disabled'), modname) return try: fp, pathname, description = imp.find_module(modname, [dir]) try: module = imp.load_module(modname, fp, pathname, description) finally: fp.close() except: if self.verbose_logger.isEnabledFor(logginglevels.DEBUG_4): raise # Give full backtrace: self.verbose_logger.error(_('Plugin "%s" can\'t be imported') % modname) return # Check API version required by the plugin if not hasattr(module, 'requires_api_version'): self.verbose_logger.error( _('Plugin "%s" doesn\'t specify required API version') % modname) return if not apiverok(API_VERSION, module.requires_api_version): self.verbose_logger.error( _('Plugin "%s" requires API %s. Supported API is %s.') % ( modname, module.requires_api_version, API_VERSION, )) return # Check plugin type against filter plugintypes = getattr(module, 'plugin_type', ALL_TYPES) if not isinstance(plugintypes, (list, tuple)): plugintypes = (plugintypes,) if len(plugintypes) < 1: return for plugintype in plugintypes: if id(plugintype) == id(TYPE_INTERFACE): self.verbose_logger.log(logginglevels.INFO_2, 'Plugin "%s" uses deprecated constant ' 'TYPE_INTERFACE.\nPlease use TYPE_INTERACTIVE ' 'instead.', modname) if plugintype not in types: return self.verbose_logger.log(logginglevels.DEBUG_3, _('Loading "%s" plugin'), modname) # Store the plugin module and its configuration file if modname not in self._plugins: self._plugins[modname] = (module, conf) else: raise Errors.ConfigError(_('Two or more plugins with the name "%s" ' \ 'exist in the plugin search path') % modname) for slot in SLOTS: funcname = slot+'_hook' if hasattr(module, funcname): self._pluginfuncs[slot].append( (modname, getattr(module, funcname)) ) def _getpluginconf(self, modname): '''Parse the plugin specific configuration file and return a IncludingConfigParser instance representing it. Returns None if there was an error reading or parsing the configuration file. ''' for dir in self.pluginconfpath: conffilename = os.path.join(dir, modname + ".conf") if os.access(conffilename, os.R_OK): # Found configuration file break self.verbose_logger.log(logginglevels.INFO_2, _("Configuration file %s not found") % conffilename) else: # for # Configuration files for the plugin not found self.verbose_logger.log(logginglevels.INFO_2, _("Unable to find configuration file for plugin %s") % modname) return None parser = ConfigParser() confpp_obj = ConfigPreProcessor(conffilename) try: parser.readfp(confpp_obj) except ParsingError, e: raise Errors.ConfigError("Couldn't parse %s: %s" % (conffilename, str(e))) return parser def setCmdLine(self, opts, commands): """Set the parsed command line options so that plugins can access them. :param opts: a dictionary containing the values of the command line options :param commands: a list of command line arguments passed to yum """ self.cmdline = (opts, commands) class DummyYumPlugins: """This class provides basic emulation of the :class:`YumPlugins` class. It exists so that calls to plugins.run() don't fail if plugins aren't in use. """ def run(self, *args, **kwargs): """Do nothing. All arguments are unused.""" pass def setCmdLine(self, *args, **kwargs): """Do nothing. All arguments are unused.""" pass class PluginConduit: """A conduit class to transfer information between yum and the plugin. """ def __init__(self, parent, base, conf): self._parent = parent self._base = base self._conf = conf self.logger = logging.getLogger("yum.plugin") self.verbose_logger = logging.getLogger("yum.verbose.plugin") def info(self, level, msg): """Send an info message to the logger. :param level: the level of the message to send :param msg: the message to send """ converted_level = logginglevels.logLevelFromDebugLevel(level) self.verbose_logger.log(converted_level, msg) def error(self, level, msg): """Send an error message to the logger. :param level: the level of the message to send :param msg: the message to send """ converted_level = logginglevels.logLevelFromErrorLevel(level) self.logger.log(converted_level, msg) def promptYN(self, msg, prompt=None): """Return a yes or no response, either from assumeyes already being set, or from prompting the user. :param msg: the message to show to the user :param prompt: the question to ask the user (optional); defaults to 'Is this ok [y/N]: ' :return: 1 if the response is yes, and 0 if the response is no """ self.info(2, msg) if self._base.conf.assumeno: return False if self._base.conf.assumeyes: return True else: kwargs = {'prompt': prompt} if prompt else {} return bool(self._base.userconfirm(**kwargs)) def getYumVersion(self): """Return a string representing the current version of yum.""" import yum return yum.__version__ def getOptParser(self): """Return the :class:`optparse.OptionParser` instance for this execution of Yum. In the "config" and "init" slots a plugin may add extra options to this instance to extend the command line options that Yum exposes. In all other slots a plugin may only read the :class:`OptionParser` instance. Any modification of the instance at this point will have no effect. See the :func:`PreRepoSetupPluginConduit.getCmdLine` method for details on how to retrieve the parsed values of command line options. :return: the global :class:`optparse.OptionParser` instance used by Yum. May be None if an OptionParser isn't in use """ # ' xemacs highlighting hack # This isn't API compatible :( # return self._parent.optparser.plugin_option_group return self._parent.optparser def confString(self, section, opt, default=None): """Read a string value from the plugin's own configuration file. :param section: configuration file section to read :param opt: option name to read :param default: value to read if the option is missing :return: string option value read, or default if option was missing """ # ' xemacs highlighting hack return config.getOption(self._conf, section, opt, config.Option(default)) def confInt(self, section, opt, default=None): """Read an integer value from the plugin's own configuration file. :param section: configuration file section to read :param opt: option name to read :param default: value to read if the option is missing :return: the integer option value read, or *default* if the option was missing or could not be parsed """ return config.getOption(self._conf, section, opt, config.IntOption(default)) def confFloat(self, section, opt, default=None): """Read a float value from the plugin's own configuration file. :param section: configuration file section to read :param opt: option name to read :param default: value to read if the option is missing :return: float option value read, or *default* if the option was missing or could not be parsed """ return config.getOption(self._conf, section, opt, config.FloatOption(default)) def confBool(self, section, opt, default=None): """Read a boolean value from the plugin's own configuration file :param section: configuration file section to read :param opt: option name to read :param default: value to read if the option is missing :return: boolean option value read, or *default* if the option was missing or could not be parsed """ return config.getOption(self._conf, section, opt, config.BoolOption(default)) def confList(self, section, opt, default=None): """Read a boolean value from the plugin's own configuration file :param section: configuration file section to read :param opt: option name to read :param default: value to read if the option is missing :return: boolean option value read, or *default* if the option was missing or could not be parsed """ return config.getOption(self._conf, section, opt, config.ListOption(default)) def registerPackageName(self, name): """Register the name of a package to use. :param name: the name of the package to register """ self._base.run_with_package_names.add(name) class ConfigPluginConduit(PluginConduit): """A conduit for use in the config slot.""" def registerOpt(self, name, valuetype, where, default): """Deprecated. Register a yum configuration file option. :param name: name of the new option :param valuetype: option type (PLUG_OPT_BOOL, PLUG_OPT_STRING, etc.) :param where: where the option should be available in the config file (PLUG_OPT_WHERE_MAIN, PLUG_OPT_WHERE_REPO, etc) :param default: default value for the option if it is not set by the user """ warnings.warn('registerOpt() will go away in a future version of Yum.\n' 'Please manipulate config.YumConf and config.RepoConf directly.', DeprecationWarning) type2opt = { PLUG_OPT_STRING: config.Option, PLUG_OPT_INT: config.IntOption, PLUG_OPT_BOOL: config.BoolOption, PLUG_OPT_FLOAT: config.FloatOption, } if where == PLUG_OPT_WHERE_MAIN: setattr(config.YumConf, name, type2opt[valuetype](default)) elif where == PLUG_OPT_WHERE_REPO: setattr(config.RepoConf, name, type2opt[valuetype](default)) elif where == PLUG_OPT_WHERE_ALL: option = type2opt[valuetype](default) setattr(config.YumConf, name, option) setattr(config.RepoConf, name, config.Inherit(option)) def registerCommand(self, command): """Register a new command. :param command: the command to register :raises: :class:`yum.Errors.ConfigError` if the registration of commands is not supported """ if hasattr(self._base, 'registerCommand'): self._base.registerCommand(command) else: raise Errors.ConfigError(_('registration of commands not supported')) class PostConfigPluginConduit(ConfigPluginConduit): """Conduit for use in the postconfig slot.""" def getConf(self): """Return a dictionary containing the values of the configuration options. :return: a dictionary containing the values of the configuration options """ return self._base.conf class InitPluginConduit(PluginConduit): """Conduit for use in the init slot.""" def getConf(self): """Return a dictionary containing the values of the configuration options. :return: a dictionary containing the values of the configuration options """ return self._base.conf def getRepos(self): """Return Yum's container object for all configured repositories. :return: Yum's :class:`yum.repos.RepoStorage` instance """ return self._base.repos class ArgsPluginConduit(InitPluginConduit): """Conduit for dealing with command line arguments.""" def __init__(self, parent, base, conf, args): InitPluginConduit.__init__(self, parent, base, conf) self._args = args def getArgs(self): """Return a list of the command line arguments passed to yum. :return: a list of the command line arguments passed to yum """ return self._args class PreRepoSetupPluginConduit(InitPluginConduit): """Conduit for use in the prererosetup slot.""" def getCmdLine(self): """Return parsed command line options. :return: (options, commands) as returned by :class:`OptionParser.parse_args()` """ return self._parent.cmdline def getRpmDB(self): """Return a representation of the local RPM database. This allows querying of installed packages. :return: a :class:`yum.rpmUtils.RpmDBHolder` instance """ return self._base.rpmdb class PostRepoSetupPluginConduit(PreRepoSetupPluginConduit): """Conduit for use in the postreposetup slot.""" def getGroups(self): """Return group information. :return: :class:`yum.comps.Comps` instance """ return self._base.comps class DownloadPluginConduit(PostRepoSetupPluginConduit): """Conduit for use in the download slots.""" def __init__(self, parent, base, conf, pkglist, errors=None): PostRepoSetupPluginConduit.__init__(self, parent, base, conf) self._pkglist = pkglist self._errors = errors def getDownloadPackages(self): """Return a list of package objects representing packages to be downloaded. :return: a list of package object representing packages to be downloaded """ return self._pkglist def getErrors(self): """Return a dictionary of download errors. :return: a dictionary of download errors. This dictionary is indexed by package object. Each element is a list of strings describing the error """ if not self._errors: return {} return self._errors class MainPluginConduit(PostRepoSetupPluginConduit): """Main conduit class for plugins. Many other conduit classes will inherit from this class. """ def getPackages(self, repo=None): """Return a list of packages. :param repo: the repo to return a packages from :return: a list of package objects """ if repo: arg = repo.id else: arg = None return self._base.pkgSack.returnPackages(arg) def getPackageByNevra(self, nevra): """Retrieve a package object from the packages loaded by Yum using nevra information. :param nevra: a tuple holding (name, epoch, version, release, arch) for a package :return: a :class:`yum.packages.PackageObject` instance (or subclass) """ return self._base.getPackageObject(nevra) def delPackage(self, po): """Delete the given package from the package sack. :param po: the package object to delete """ po.repo.sack.delPackage(po) def getTsInfo(self): """Return transaction set. :return: the transaction set """ return self._base.tsInfo class DepsolvePluginConduit(MainPluginConduit): """Conduit for use in solving dependencies.""" def __init__(self, parent, base, conf, rescode=None, restring=[]): MainPluginConduit.__init__(self, parent, base, conf) self.resultcode = rescode self.resultstring = restring @property def missing_requires(self): """Boolean indicating if depsolving failed due to missing dependencies.""" return self._base._missing_requires def pretty_output_restring(self): return '\n'.join(prefix % msg for prefix, msg in self._base.pretty_output_restring(self.resultstring)) class CompareProvidersPluginConduit(MainPluginConduit): """Conduit to compare different providers of packages.""" def __init__(self, parent, base, conf, providers_dict={}, reqpo=None): MainPluginConduit.__init__(self, parent, base, conf) self.packages = providers_dict self.reqpo = reqpo class HistoryPluginConduit(MainPluginConduit): """Conduit to access information about the yum history.""" def __init__(self, parent, base, conf, rescode=None, restring=[]): MainPluginConduit.__init__(self, parent, base, conf) self.history = self._base.history class VerifyPluginConduit(MainPluginConduit): """Conduit to verify packages.""" def __init__(self, parent, base, conf, verify_package): MainPluginConduit.__init__(self, parent, base, conf) self.verify_package = verify_package def parsever(apiver): """Parse a string representing an api version. :param apiver: a string representing an api version :return: a tuple containing the major and minor version numbers """ maj, min = apiver.split('.') return int(maj), int(min) def apiverok(a, b): """Return true if API version "a" supports API version "b" :param a: a string representing an api version :param b: a string representing an api version :return: whether version *a* supports version *b* """ a = parsever(a) b = parsever(b) if a[0] != b[0]: return 0 if a[1] >= b[1]: return 1 return 0