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File name : yum-cron

Content :#!/usr/bin/python -tt import os import sys import gzip from socket import gethostname import yum import yum.Errors from yum.config import BaseConfig, Option, IntOption, ListOption, BoolOption from yum.parser import ConfigPreProcessor from ConfigParser import ConfigParser, ParsingError from yum.constants import * from email.mime.text import MIMEText from yum.i18n import to_str, to_utf8, to_unicode, utf8_width, utf8_width_fill, utf8_text_fill from yum import _, P_ import yum.updateinfo import smtplib from random import random from time import sleep from yum.misc import setup_locale # FIXME: is it really sane to use this from here? sys.path.append('/usr/share/yum-cli') from output import YumOutput import callback default_config_file = '/etc/yum/yum-cron.conf' class UpdateEmitter(object): """Abstract class for implementing different types of emitters. Most methods will add certain messages the output list. Then, the sendMessage method can be overridden in a subclass to combine these messages and transmit them as required. """ def __init__(self, opts): self.opts = opts self.output = [] def updatesAvailable(self, summary): """Appends a message to the output list stating that there are updates available. :param summary: A human-readable summary of the transaction. """ self.output.append('The following updates are available on %s:' % self.opts.system_name) self.output.append(summary) def updatesDownloading(self, summary): """Append a message to the output list stating that downloading updates has started. :param summary: A human-readable summary of the transaction. """ self.output.append('The following updates will be downloaded on %s:' % self.opts.system_name) self.output.append(summary) def updatesDownloaded(self): """Append a message to the output list stating that updates have been downloaded successfully. """ self.output.append("Updates downloaded successfully.") def updatesInstalling(self, summary): """Append a message to the output list stating that installing updates has started. :param summary: A human-readable summary of the transaction. """ self.output.append('The following updates will be applied on %s:' % self.opts.system_name) self.output.append(summary) def updatesInstalled(self): """Append a message to the output list stating that updates have been installed successfully. """ self.output.append('The updates were successfully applied') def setupFailed(self, errmsg): """Append a message to the output list stating that setup failed, and then call sendMessages to emit the output. :param errmsgs: a string that contains the error message """ self.output.append("Plugins failed to initialize with the following error message: \n%s" % errmsg) self.sendMessages() def checkFailed(self, errmsg): """Append a message to the output stating that checking for updates failed, then call sendMessages to emit the output. :param errmsgs: a string that contains the error message """ self.output.append("Failed to check for updates with the following error message: \n%s" % errmsg) self.sendMessages() def groupError(self, errmsg): """Append a message to the output list stating that an error was encountered while checking for group updates. :param errmsgs: a string that contains the error message """ self.output.append("Error checking for group updates: \n%s" % errmsg) def groupFailed(self, errmsg): """Append a message to the output list stating that checking for group updates failed, then call sendMessages to emit the output. :param errmsgs: a string that contains the error message """ self.output.append("Failed to check for updates with the following error message: \n%s" % errmsg) self.sendMessages() def downloadFailed(self, errmsg): """Append a message to the output list stating that downloading updates failed, then call sendMessages to emit the output. :param errmsgs: a string that contains the error message """ self.output.append("Updates failed to download with the following error message: \n%s" % errmsg) self.sendMessages() def updatesFailed(self, errmsg): """Append a message to the output list stating that installing updates failed, then call sendMessages to emit the output. :param errmsgs: a string that contains the error message """ self.output.append("Updates failed to install with the following error message: \n%s" % errmsg) self.sendMessages() def sendMessages(self): """Send the messages that have been stored. This should be overridden by inheriting classes to emit the messages according to their individual methods. """ # Convert any byte strings to unicode objects now (so that we avoid # implicit conversions with the "ascii" codec later when join()-ing the # strings, leading to tracebacks). self.output = [x.decode('utf-8') if isinstance(x, str) else x for x in self.output] class EmailEmitter(UpdateEmitter): """Emitter class to send messages via email.""" def __init__(self, opts, logger): super(EmailEmitter, self).__init__(opts) self.logger = logger self.subject = "" def updatesAvailable(self, summary): """Appends a message to the output list stating that there are updates available, and set an appropriate subject line. :param summary: A human-readable summary of the transaction. """ super(EmailEmitter, self).updatesAvailable(summary) self.subject = "Yum: Updates Available on %s" % self.opts.system_name def updatesDownloaded(self): """Append a message to the output list stating that updates have been downloaded successfully, and set an appropriate subject line. """ self.subject = "Yum: Updates downloaded on %s" % self.opts.system_name super(EmailEmitter, self).updatesDownloaded() def updatesInstalled(self): """Append a message to the output list stating that updates have been installed successfully, and set an appropriate subject line. """ self.subject = "Yum: Updates installed on %s" % self.opts.system_name super(EmailEmitter, self).updatesInstalled() def setupFailed(self, errmsg): """Append a message to the output list stating that setup failed, and then call sendMessages to emit the output, and set an appropriate subject line. :param errmsgs: a string that contains the error message """ self.subject = "Yum: Failed to perform setup on %s" % self.opts.system_name super(EmailEmitter, self).setupFailed(errmsg) def checkFailed(self, errmsg): """Append a message to the output stating that checking for updates failed, then call sendMessages to emit the output, and set an appropriate subject line. :param errmsgs: a string that contains the error message """ self.subject = "Yum: Failed to check for updates on %s" % self.opts.system_name super(EmailEmitter, self).checkFailed(errmsg) def downloadFailed(self, errmsg): """Append a message to the output list stating that checking for group updates failed, then call sendMessages to emit the output, and add an appropriate subject line. :param errmsgs: a string that contains the error message """ self.subject = "Yum: Failed to download updates on %s" % self.opts.system_name super(EmailEmitter, self).downloadFailed(errmsg) def updatesFailed(self, errmsg): """Append a message to the output list stating that installing updates failed, then call sendMessages to emit the output, and add an appropriate subject line. :param errmsgs: a string that contains the error message """ self.subject = "Yum: Failed to install updates on %s" % self.opts.system_name super(EmailEmitter, self).updatesFailed(errmsg) def sendMessages(self): """Combine the stored messages that have been stored into a single email message, and send this message. """ super(EmailEmitter, self).sendMessages() # Don't send empty emails if not self.output: return # Build up the email to be sent. Encode it with us-ascii instead of # utf-8 if possible. This ensures the email package will not # transfer-encode it to base64 in such a case (it decides based on the # charset passed to the MIMEText constructor). output = ''.join(self.output) try: output.encode('us-ascii') except UnicodeEncodeError: charset = 'utf-8' else: charset = 'us-ascii' msg = MIMEText(output, 'plain', charset) msg['Subject'] = self.subject username, at, domain = self.opts.email_from.rpartition('@') if domain == 'localhost': domain = self.opts.system_name msg['From'] = '%s@%s' % (username, domain) msg['To'] = ",".join(self.opts.email_to) # Send the email try: s = smtplib.SMTP() s.connect(self.opts.email_host) s.sendmail(self.opts.email_from, self.opts.email_to, msg.as_string()) s.close() except Exception, e: self.logger.error("Failed to send an email to %s: %s" % (self.opts.email_host, e)) class StdIOEmitter(UpdateEmitter): """Emitter class to send messages to syslog.""" def __init__(self, opts): super(StdIOEmitter, self).__init__(opts) def sendMessages(self) : """Combine the stored messages that have been stored into a single email message, and send this message to standard output. """ super(StdIOEmitter, self).sendMessages() # Don't print blank lines if not self.output: return print "".join(self.output) class YumCronConfig(BaseConfig): """Class to parse configuration information from the config file, and to store this information. """ system_name = Option(gethostname()) output_width = IntOption(80) random_sleep = IntOption(0) lock_retries = IntOption(5) lock_sleep = IntOption(60) emit_via = ListOption(['email','stdio']) email_to = ListOption(["root"]) email_from = Option("root") email_host = Option("localhost") email_port = IntOption(25) update_messages = BoolOption(False) update_cmd = Option("default") apply_updates = BoolOption(False) download_updates = BoolOption(False) yum_config_file = Option("/etc/yum.conf") group_list = ListOption([]) group_package_types = ListOption(['mandatory', 'default']) class YumCronBase(yum.YumBase, YumOutput): """Main class to check for and apply the updates.""" def __init__(self, config_file_name = None): """Create a YumCronBase object, and perform initial setup. :param config_file_name: a String specifying the name of the config file to use. """ yum.YumBase.__init__(self) YumOutput.__init__(self) # Read the config file self.readConfigFile(config_file_name) self.term.reinit(color='never') self.term.columns = self.opts.output_width # Create the emitters, and add them to the list self.emitters = [] if 'email' in self.opts.emit_via: self.emitters.append(EmailEmitter(self.opts, self.logger)) if 'stdio' in self.opts.emit_via: self.emitters.append(StdIOEmitter(self.opts)) self.updateInfo = [] self.updateInfoTime = None def readConfigFile(self, config_file_name = None): """Reads the given config file, or if none is given, the default config file. :param config_file_name: a String specifying the name of the config file to read. """ # Create ConfigParser and UDConfig Objects confparser = ConfigParser() self.opts = YumCronConfig() #If no config file name is given, fall back to the default if config_file_name == None: config_file_name = default_config_file # Attempt to read the config file. confparser.read will return a # list of the files that were read successfully, so check that it # contains config_file if config_file_name not in confparser.read(config_file_name): print >> sys.stderr, "Error reading config file:", config_file_name sys.exit(1) # Populate the values into the opts object self.opts.populate(confparser, 'commands') self.opts.populate(confparser, 'emitters') self.opts.populate(confparser, 'email') self.opts.populate(confparser, 'groups') self._confparser = confparser #If the system name is not given, set it by getting the hostname if self.opts.system_name == 'None' : self.opts.system_name = gethostname() if 'None' in self.opts.group_list: self.opts.group_list = [] def randomSleep(self, duration): """Sleep for a random amount of time up to *duration*. :param duration: the maximum amount of time to sleep, in minutes. The actual time slept will be between 0 and *duration* minutes """ if duration > 0: sleep(random() * 60 * duration) def doSetup(self): """Perform set up, including setting up directories and parsing options. :return: boolean that indicates whether setup has completed successfully """ try : # Set the configuration file self.preconf.fn = self.opts.yum_config_file # This needs to be set early, errors are handled later. try: level = int(self._confparser.get('base', 'debuglevel')) except: level = -2 self.preconf.debuglevel = level if -4 <= level <= -2: self.preconf.errorlevel = level + 4 # if we are not root do the special subdir thing if os.geteuid() != 0: self.setCacheDir() # override base yum options self.conf.populate(self._confparser, 'base') del self._confparser except Exception, e: # If there are any exceptions, send a message about them, # and return False self.emitSetupFailed('%s' % e) sys.exit(1) def acquireLock(self): """ Wrapper method around doLock to emit errors correctly.""" i = 0 while True: try: self.doLock(); break except yum.Errors.LockError, e: i += 1 if i < self.opts.lock_retries: sleep(self.opts.lock_sleep) continue self.logger.warn("Failed to acquire the yum lock: %s", e) sys.exit(1) def populateUpdateMetadata(self): """Populate the metadata for the packages in the update.""" for repo in self.repos.sort(): repo.metadata_expire = 0 repo.skip_if_unavailable = True self.pkgSack # honor skip_if_unavailable self.upinfo def refreshUpdates(self): """Check whether updates are available. :return: Boolean indicating whether any updates are available """ try: # Just call .update() because it does obsoletes loops, and group # objects. etc. update_cmd = self.opts.update_cmd idx = update_cmd.find("security-severity:") if idx != -1: sevs = update_cmd[idx + len("security-severity:"):] update_cmd = update_cmd[:idx + len("security")] self.updateinfo_filters['sevs'] = sevs.split(",") if update_cmd in ('minimal', 'minimal-security'): if not yum.updateinfo.update_minimal(self): return False self.updateinfo_filters['bugfix'] = True elif update_cmd in ('default', 'security', 'default-security'): if not self.update(): return False else: # return False ? update_cmd = 'default' if not self.update(): return False if update_cmd.endswith("security"): self.updateinfo_filters['security'] = True yum.updateinfo.remove_txmbrs(self) elif update_cmd == 'minimal': self.updateinfo_filters['bugfix'] = True yum.updateinfo.remove_txmbrs(self) except Exception, e: self.emitCheckFailed("%s" %(e,)) sys.exit(1) else: return True def refreshGroupUpdates(self): """Check for group updates, and add them to the transaction. :return: Boolean indicating whether there are any updates to the group available """ if self.conf.group_command == 'objects': return False update_available = False try: for group_string in self.opts.group_list: group_matched = False for group in self.comps.return_groups(group_string): group_matched = True try: txmbrs = self.selectGroup(group.groupid, self.opts.group_package_types, upgrade=True) # If updates are available from a previous # group, or there are updates are available # from this group, set update_available to True update_available |= (txmbrs != []) except yum.Errors.GroupsError: self.emitGroupError('Warning: Group %s does not exist.' % group_string) continue if not group_matched: self.emitGroupError('Warning: Group %s does not exist.' % group_string) continue except Exception, e: self.emitGroupFailed("%s" % e) return False else: return update_available def findDeps(self): """Build the transaction to resolve the dependencies for the update.""" try: (res, resmsg) = self.buildTransaction() except yum.Errors.RepoError, e: self.emitCheckFailed("%s" %(e,)) sys.exit(1) if res == 0: # success, empty transaction sys.exit(0) elif res == 2: # success, dependencies resolved pass else: self.emitCheckFailed("Failed to build transaction: %s" %(str.join("\n", resmsg),)) sys.exit(1) def downloadUpdates(self, emit): """Download the update. :param emit: Boolean indicating whether to emit messages about the download """ # Emit a message that that updates will be downloaded if emit : self.emitDownloading() dlpkgs = map(lambda x: x.po, filter(lambda txmbr: txmbr.ts_state in ("i", "u"), self.tsInfo.getMembers())) try: # Download the updates self.conf.downloadonly = not self.opts.apply_updates self.downloadPkgs(dlpkgs) except Exception, e: self.emitDownloadFailed("%s" % e) sys.exit(1) except SystemExit, e: if e.code == 0: # Emit a message that the packages have been downloaded self.emitDownloaded() self.emitMessages() raise def installUpdates(self, emit): """Apply the available updates. :param emit: Boolean indicating whether to emit messages about the installation """ # Emit a message that if emit : self.emitInstalling() dlpkgs = map(lambda x: x.po, filter(lambda txmbr: txmbr.ts_state in ("i", "u"), self.tsInfo.getMembers())) for po in dlpkgs: result, err = self.sigCheckPkg(po) if result == 0: continue elif result == 1: try: self.getKeyForPackage(po) except yum.Errors.YumBaseError, errmsg: self.emitUpdateFailed(errmsg) return False else: self.emitUpdateFailed(err) return False del self.ts self.initActionTs() # make a new, blank ts to populate self.populateTs(keepold=0) self.ts.check() #required for ordering self.ts.order() # order cb = callback.RPMInstallCallback(output = 0) cb.filelog = True cb.tsInfo = self.tsInfo try: self.runTransaction(cb=cb) except yum.Errors.YumBaseError, err: self.emitUpdateFailed(err) sys.exit(1) if emit : self.emitInstalled() self.emitMessages() def updatesCheck(self): """Check to see whether updates are available for any installed packages. If updates are available, install them, download them, or just emit a message, depending on what options are selected in the configuration file. """ # Sleep a random time self.randomSleep(self.opts.random_sleep) # Perform the initial setup self.doSetup() # Acquire the yum lock self.acquireLock() # Update the metadata self.populateUpdateMetadata() # Exit if we don't need to check for updates if not (self.opts.update_messages or self.opts.download_updates or self.opts.apply_updates): sys.exit(0) # Check for updates in packages, or groups ... need to run both. pups = self.refreshUpdates() gups = self.refreshGroupUpdates() # If neither have updates, we can just exit. if not (pups or gups): sys.exit(0) # Build the transaction to find the additional dependencies self.findDeps() # download if set up to do so, else tell about the updates and exit if not self.opts.download_updates: self.emitAvailable() self.emitMessages() self.releaseLocks() sys.exit(0) self.downloadUpdates(not self.opts.apply_updates) # now apply if we're set up to do so; else just tell that things are # available if not self.opts.apply_updates: self.releaseLocks() sys.exit(0) self.installUpdates(self.opts.update_messages) self.releaseLocks() sys.exit(0) def releaseLocks(self): """Close the rpm database, and release the yum lock.""" self.closeRpmDB() self.doUnlock() def emitAvailable(self): """Emit a notice stating whether updates are available.""" summary = self.listTransaction() map(lambda x: x.updatesAvailable(summary), self.emitters) def emitDownloading(self): """Emit a notice stating that updates are downloading.""" summary = self.listTransaction() map(lambda x: x.updatesDownloading(summary), self.emitters) def emitDownloaded(self): """Emit a notice stating that updates have downloaded.""" map(lambda x: x.updatesDownloaded(), self.emitters) def emitInstalling(self): """Emit a notice stating that automatic updates are about to be applied. """ summary = self.listTransaction() map(lambda x: x.updatesInstalling(summary), self.emitters) def emitInstalled(self): """Emit a notice stating that automatic updates have been applied.""" map(lambda x: x.updatesInstalled(), self.emitters) def emitSetupFailed(self, error): """Emit a notice stating that checking for updates failed.""" map(lambda x: x.setupFailed(error), self.emitters) def emitCheckFailed(self, error): """Emit a notice stating that checking for updates failed.""" map(lambda x: x.checkFailed(error), self.emitters) def emitGroupError(self, error): """Emit a notice stating that there was an error checking for group updates. """ map(lambda x: x.groupError(error), self.emitters) def emitGroupFailed(self, error): """Emit a notice stating that checking for group updates failed.""" map(lambda x: x.groupFailed(error), self.emitters) def emitDownloadFailed(self, error): """Emit a notice stating that downloading the updates failed.""" map(lambda x: x.downloadFailed(error), self.emitters) def emitUpdateFailed(self, errmsg): """Emit a notice stating that automatic updates failed.""" map(lambda x: x.updatesFailed(errmsg), self.emitters) def emitMessages(self): """Emit the messages from the emitters.""" map(lambda x: x.sendMessages(), self.emitters) def main(): """Configure and run the update check.""" setup_locale(override_time=True) # If a file name was passed in, use it as the config file name. base = None if len(sys.argv) > 1: base = YumCronBase(sys.argv[1]) else: base = YumCronBase() #Run the update check base.updatesCheck() if __name__ == "__main__": main()

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