#!/usr/bin/python2 import sys, os from random import Random import string from types import StringTypes from time import strftime TIMEFORMAT="%Y-%m-%d %H:%M:%S" NODEUPDATE_PID_FILE= "/var/run/NodeUpdate.pid" # variables for cron file creation TARGET_SCRIPT = '(echo && date && echo && /usr/bin/NodeUpdate.py start) >>/var/log/NodeUpdate.log 2>&1' TARGET_DESC = 'Update node RPMs periodically' TARGET_USER = 'root' TARGET_SHELL = '/bin/bash' CRON_FILE = '/etc/cron.d/NodeUpdate.cron' YUM_PATH = "/usr/bin/yum" RPM_PATH = "/bin/rpm" RPM_GPG_PATH = "/etc/pki/rpm-gpg" # location of file containing http/https proxy info, if needed PROXY_FILE = '/etc/planetlab/http_proxy' # this is the flag that indicates an update needs to restart # the system to take effect. it is created by the rpm that requested # the reboot REBOOT_FLAG = '/etc/planetlab/update-reboot' # location of directory containing boot server ssl certs SSL_CERT_DIR='/mnt/cdrom/bootme/cacert/' # file containing the list of extensions this node has, each # correspond to a package group in yum repository. EXTENSIONS_FILE='/etc/planetlab/extensions' # file containing a list of rpms that we should attempt to delete # before updating everything else. This list is not removed with # 'yum remove', because that could accidently remove dependency rpms # that were not intended to be deleted. DELETE_RPM_LIST_FILE= '/etc/planetlab/delete-rpm-list' # print out a message only if we are displaying output def Message(message): if displayOutput: if isinstance(message,StringTypes) and len(message) >=2 and message[0]=="\n": print "\n", message=message[1:] print strftime(TIMEFORMAT), print message # always print errors def Error(Str): print strftime(TIMEFORMAT), print Str # create an entry in /etc/cron.d so we run periodically. # we will be run once a day at a 0-59 minute random offset # into a 0-23 random hour def UpdateCronFile(): try: randomMinute= Random().randrange( 0, 59, 1 ); randomHour= Random().randrange( 0, 11, 1 ); f = open( CRON_FILE, 'w' ); f.write( "# %s\n" % (TARGET_DESC) ); ### xxx is root aliased to the support mailing list ? f.write( "MAILTO=%s\n" % (TARGET_USER) ); f.write( "SHELL=%s\n" % (TARGET_SHELL) ); f.write( "%s %s,%s * * * %s %s\n\n" % (randomMinute, randomHour, randomHour + 12, TARGET_USER, TARGET_SCRIPT) ); f.close() print( "Created new cron.d entry." ) except: print( "Unable to create cron.d entry." ) # simply remove the cron file we created def RemoveCronFile(): try: os.unlink( CRON_FILE ) print( "Deleted cron.d entry." ) except: print( "Unable to delete cron.d entry." ) class NodeUpdate: def __init__( self, doReboot ): if self.CheckProxy(): os.environ['http_proxy']= self.HTTP_PROXY os.environ['HTTP_PROXY']= self.HTTP_PROXY self.doReboot= doReboot def CheckProxy( self ): Message( "Checking existence of proxy config file..." ) if os.access(PROXY_FILE, os.R_OK) and os.path.isfile(PROXY_FILE): self.HTTP_PROXY= string.strip(file(PROXY_FILE,'r').readline()) Message( "Using proxy %s." % self.HTTP_PROXY ) return 1 else: Message( "Not using any proxy." ) return 0 def InstallKeys( self ): Message( "\nRemoving any existing GPG signing keys from the RPM database" ) os.system( "%s --allmatches -e gpg-pubkey" % RPM_PATH ) Message( "\nInstalling all GPG signing keys in %s" % RPM_GPG_PATH ) os.system( "%s --import %s/*" % (RPM_PATH, RPM_GPG_PATH) ) def ClearRebootFlag( self ): os.system( "/bin/rm -rf %s" % REBOOT_FLAG ) def CheckForUpdates( self ): Message( "\nRemoving any existing reboot flags" ) self.ClearRebootFlag() if self.doReboot == 0: Message( "\nIgnoring any reboot flags set by RPMs" ); Message( "\nChecking if yum supports SSL certificate checks" ) if os.system( "%s --help | grep -q sslcertdir" % YUM_PATH ) == 0: Message( "It does, using --sslcertdir option" ) sslcertdir = "--sslcertdir=" + SSL_CERT_DIR else: Message( "Unsupported, not using --sslcertdir option" ) sslcertdir = "" yum_options="" Message( "\nChecking if yum supports --verbose" ) if os.system( "%s --help | grep -q verbose" % YUM_PATH ) == 0: Message( "It does, using --verbose option" ) yum_options += " --verbose" else: Message( "Unsupported, not using --verbose option" ) Message( "\nUpdating PlanetLab group" ) os.system( "%s %s %s -y groupupdate \"PlanetLab\"" % (YUM_PATH, yum_options, sslcertdir) ) Message( "\nUpdating rest of system" ) os.system( "%s %s %s -y update" % (YUM_PATH, yum_options, sslcertdir) ) Message( "\nChecking for extra groups (extensions) to update" ) if os.access(EXTENSIONS_FILE, os.R_OK) and \ os.path.isfile(EXTENSIONS_FILE): extensions_contents= file(EXTENSIONS_FILE).read() extensions_contents= string.strip(extensions_contents) if extensions_contents == "": Message( "No extra groups found in file." ) else: extensions_contents.strip() for extension in extensions_contents.split(): group = "extension%s" % extension Message( "\nUpdating %s group" % group ) os.system( "%s %s %s -y groupupdate \"%s\"" % (YUM_PATH, yum_options, sslcertdir, group) ) else: Message( "No extensions file found" ) if os.access(REBOOT_FLAG, os.R_OK) and os.path.isfile(REBOOT_FLAG) and self.doReboot: Message( "\nAt least one update requested the system be rebooted" ) self.ClearRebootFlag() os.system( "/sbin/shutdown -r now" ) def RebuildRPMdb( self ): Message( "\nRebuilding RPM Database." ) try: os.system( "rm /var/lib/rpm/__db.*" ) except Exception, err: print "RebuildRPMdb: %s" % err try: os.system( "%s --rebuilddb" % RPM_PATH ) except Exception, err: print "RebuildRPMdb: %s" % err def YumCleanAll ( self ): Message ("\nCleaning all yum cache (yum clean all)") try: os.system( "yum clean all") except: pass def RemoveRPMS( self ): Message( "\nLooking for RPMs to be deleted." ) if os.access(DELETE_RPM_LIST_FILE, os.R_OK) and \ os.path.isfile(DELETE_RPM_LIST_FILE): rpm_list_contents= file(DELETE_RPM_LIST_FILE).read() rpm_list_contents= string.strip(rpm_list_contents) if rpm_list_contents == "": Message( "No RPMs listed in file to delete." ) return rpm_list= string.join(string.split(rpm_list_contents)) Message( "Deleting these RPMs:" ) Message( rpm_list_contents ) rc= os.system( "%s -ev %s" % (RPM_PATH, rpm_list) ) if rc != 0: Error( "Unable to delete RPMs, continuing. rc=%d" % rc ) else: Message( "RPMs deleted successfully." ) else: Message( "No RPMs list file found." ) if __name__ == "__main__": # if we are invoked with 'start', display the output. # this is useful for running something silently # under cron and as a service (at startup), # so the cron only outputs errors and doesn't # generate mail when it works correctly displayOutput= 0 # if we hit an rpm that requests a reboot, do it if this is # set to 1. can be turned off by adding noreboot to command line # option doReboot= 1 if "start" in sys.argv or "display" in sys.argv: displayOutput= 1 Message ("\nTurning on messages") if "noreboot" in sys.argv: doReboot= 0 if "updatecron" in sys.argv: # simply update the /etc/cron.d file for us, and exit UpdateCronFile() sys.exit(0) if "removecron" in sys.argv: RemoveCronFile() sys.exit(0) # see if we are already running by checking the existance # of a PID file, and if it exists, attempting a test kill # to see if the process really does exist. If both of these # tests pass, exit. if os.access(NODEUPDATE_PID_FILE, os.R_OK): pid= string.strip(file(NODEUPDATE_PID_FILE).readline()) if pid <> "": if os.system("/bin/kill -0 %s > /dev/null 2>&1" % pid) == 0: Message( "It appears we are already running, exiting." ) sys.exit(1) # write out our process id pidfile= file( NODEUPDATE_PID_FILE, 'w' ) pidfile.write( "%d\n" % os.getpid() ) pidfile.close() nodeupdate= NodeUpdate(doReboot) if not nodeupdate: Error( "Unable to initialize." ) else: nodeupdate.RebuildRPMdb() nodeupdate.RemoveRPMS() nodeupdate.InstallKeys() nodeupdate.YumCleanAll() nodeupdate.CheckForUpdates() Message( "\nUpdate complete." ) # remove the PID file os.unlink( NODEUPDATE_PID_FILE )