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| Current File : //proc/3/task/3/cwd/usr/lib/python2.6/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 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',
'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):
'''Used 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.
'''
# 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]
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
# 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.*
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
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
'''
self.cmdline = (opts, commands)
class DummyYumPlugins:
'''
This class provides basic emulation of the YumPlugins class. It exists so
that calls to plugins.run() don't fail if plugins aren't in use.
'''
def run(self, *args, **kwargs):
pass
def setCmdLine(self, *args, **kwargs):
pass
class PluginConduit:
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):
converted_level = logginglevels.logLevelFromDebugLevel(level)
self.verbose_logger.log(converted_level, msg)
def error(self, level, msg):
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):
import yum
return yum.__version__
def getOptParser(self):
'''Return the 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 OptionParser instance.
Any modification of the instance at this point will have no effect.
See the getCmdLine() method for details on how to retrieve the parsed
values of command line options.
@return: the global 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 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 option is missing.
@return: Integer option value read, or default if 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 option is missing.
@return: Float option value read, or default if 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 option is missing.
@return: Boolean option value read, or default if 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):
self._base.run_with_package_names.add(name)
class ConfigPluginConduit(PluginConduit):
def registerOpt(self, name, valuetype, where, default):
'''Register a yum configuration file option.
@param name: Name of the new option.
@param valuetype: Option type (PLUG_OPT_BOOL, PLUG_OPT_STRING ...)
@param where: Where the option should be available in the config file.
(PLUG_OPT_WHERE_MAIN, PLUG_OPT_WHERE_REPO, ...)
@param default: Default value for the option if 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):
if hasattr(self._base, 'registerCommand'):
self._base.registerCommand(command)
else:
raise Errors.ConfigError(_('registration of commands not supported'))
class PostConfigPluginConduit(ConfigPluginConduit):
def getConf(self):
return self._base.conf
class InitPluginConduit(PluginConduit):
def getConf(self):
return self._base.conf
def getRepos(self):
'''Return Yum's container object for all configured repositories.
@return: Yum's RepoStorage instance
'''
return self._base.repos
class ArgsPluginConduit(InitPluginConduit):
def __init__(self, parent, base, conf, args):
InitPluginConduit.__init__(self, parent, base, conf)
self._args = args
def getArgs(self):
return self._args
class PreRepoSetupPluginConduit(InitPluginConduit):
def getCmdLine(self):
'''Return parsed command line options.
@return: (options, commands) as returned by OptionParser.parse_args()
'''
return self._parent.cmdline
def getRpmDB(self):
'''Return a representation of local RPM database. This allows querying
of installed packages.
@return: rpmUtils.RpmDBHolder instance
'''
return self._base.rpmdb
class PostRepoSetupPluginConduit(PreRepoSetupPluginConduit):
def getGroups(self):
'''Return group information.
@return: yum.comps.Comps instance
'''
return self._base.comps
class DownloadPluginConduit(PostRepoSetupPluginConduit):
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 self._pkglist
def getErrors(self):
'''Return a dictionary of download errors.
The returned 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):
def getPackages(self, repo=None):
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 PackageObject instance (or subclass)
'''
return self._base.getPackageObject(nevra)
def delPackage(self, po):
po.repo.sack.delPackage(po)
def getTsInfo(self):
return self._base.tsInfo
class DepsolvePluginConduit(MainPluginConduit):
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):
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):
def __init__(self, parent, base, conf, rescode=None, restring=[]):
MainPluginConduit.__init__(self, parent, base, conf)
self.history = self._base.history
class VerifyPluginConduit(MainPluginConduit):
def __init__(self, parent, base, conf, verify_package):
MainPluginConduit.__init__(self, parent, base, conf)
self.verify_package = verify_package
def parsever(apiver):
maj, min = apiver.split('.')
return int(maj), int(min)
def apiverok(a, b):
'''Return true if API version "a" supports API version "b"
'''
a = parsever(a)
b = parsever(b)
if a[0] != b[0]:
return 0
if a[1] >= b[1]:
return 1
return 0
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