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| Current File : //usr/sbin/yum-cron |
#!/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()