ubuntu auto-update script to keep systems up to date on patches/etc

auto_update.sh

#!/bin/bash
# Script Name: auto_update.sh
# Original Author Name: Keith Bawden
# Modified by : Aaron
# Date: Wed May 17 15:40:32 JST 2006
# Updated: Thur Feb 01, 2007
# Description: This script will:
#        Clean up the local apt repository of retrieved packages (apt-get clean)
#        Resync the package index (apt-get update)    
#        If called with AUTOUPDATE set to yes then updates will be downloaded and 
#   applied with no feed back (not recommended)
#        If called without AUTOUPDATE then packages are downloaded and an email is 
#   sent informing which packages are to be updated.
#        And more ;-)
# NOTE: Perl is needed for this script to work. 
# NOTE: A custom header is added to every email send to:
#                X-Maint: ERROR  and X-Maint: SUCCESS
# NOTE: Standard and detailed logging added, as well as e-mail notifications
#	for any update activity
 
#
# Make user configuration changes in this section 
#
 
export [email protected]
MAILTO="aaron"
AUTOUPDATE="yes" 
LOGFILE="/var/log/auto_update.log"
MAILFILE="/var/log/auto_update_detail.log"
THISSERVER=`hostname --fqdn` 
 
#
# End of user configuration section 
#
 
DASHES="---------------------------------------------------------------------------------"
DASHES2="================================================================================="
 
# Check if the script is being run as root exit if it is not.
if [ "$UID" -ne "0" ]
then
    echo "[ERROR] This script must be run as root"
    exit 1
fi
 
function start_logging {
    echo $DASHES2 >> $LOGFILE
  echo "$0 started running at `date`" > $LOGFILE
    echo $DASHES2 >> $LOGFILE
}                
 
function stoplogging {
    echo "`date` [MESSAGE] $0 finished runnning" >> $LOGFILE
    echo $DASHES >> $LOGFILE
}
 
function check_return {
    if [ "$?" -ne "0" ]
        then
          echo "`date` [ERROR]   $1 failed to run" >> $LOGFILE
            send_error_email $1
            stoplogging
          exit 1
    fi
    echo "`date` [SUCCESS] $1 ran without error" >> $LOGFILE
}
 
function send_error_email {
    mail -s "[$THISSERVER] There was an error whilst running $0" -a "X-Maint: ERROR" $MAILTO <<EOF
Hello,
 
Whilst running the update script ($0) on $THISSERVER there was a problem.
 
[ERROR] "$1" failed to run
 
The server has the following network interfaces configured ${SERVERADDS[@]}.
 
Please log in via ssh (e.g. ssh root@${IPADDR[0]}) and check the log file:
 
vim $LOGFILE
 
Regards.
EOF
}
 
# IP Address stuff
declare -a IPADDR
declare -a NICINTERFACE
declare -a SERVERADDS
index=0
 
for i in $( ifconfig | grep 'inet addr' | awk '{print $2}'| sed 's#addr:##g' );
do
    IPADDR[$index]=$i
    let "index += 1"
done
 
index=0
 
for i in $( ifconfig | grep 'eth' | awk '{print $1}' );
do
    SERVERADDS[$index]="$i ${IPADDR[$index]}"
    let "index += 1"
done
 
# End IP Address stuff
 
start_logging
 
apt-get clean > /dev/null
check_return "apt-get clean"
 
apt-get update > /dev/null
check_return "apt-get update"
 
if [[ "$AUTOUPDATE" == "yes" ]]
then
    PACKAGES_TO_BE_UPGRADED=`apt-get -Vs upgrade | perl -ne 'print if /upgraded:/ .. /upgraded,/'`
    if [[ -z $PACKAGES_TO_BE_UPGRADED ]]
	then
    	echo "`date` [MESSAGE] No packages need updating." >> $LOGFILE
	mail -s "[$THISSERVER] does not need upgrading on `date +%m-%d-%y`" $MAILTO <<EOF
On `date` [$THISSERVER] checked for updates, the status was 

`cat $LOGFILE`
.
EOF
    else
    apt-get -yq upgrade > $MAILFILE
    check_return "apt-get -yq upgrade"
    mail -s "[$THISSERVER] has been updated on `date +%m-%d-%y`" $MAILTO <<EOF
On `date` [$THISSERVER] was upgraded with the following packages

$PACKAGES_TO_BE_UPGRADED

The status was 

`cat $MAILFILE`
`cat $LOGFILE`
.
EOF
    fi
else 
    PACKAGES_TO_BE_UPGRADED=`apt-get -Vs upgrade | perl -ne 'print if /upgraded:/ .. /upgraded,/'`
    apt-get -yqd upgrade > /dev/null
    check_return "apt-get -yqd upgrade"
fi
 
if [[ -z $PACKAGES_TO_BE_UPGRADED ]]
then
    echo "`date` [MESSAGE] No packages need updating." >> $LOGFILE
else
  mail -s "[$THISSERVER] server may need some updates applied" -a "X-Maint: SUCCESS" $MAILTO <<EOF
Hello,
 
Packages have been downloaded onto $THISSERVER.
 
$PACKAGES_TO_BE_UPGRADED
 
The server has the following network interfaces configured ${SERVERADDS[@]}.
 
To update the server log in via ssh (e.g. ssh root@${IPADDR[0]}) and run the following command:
 
apt-get upgrade
 
See the logfile for more info: vim $LOGFILE
 
Regards.
EOF
 
  echo "`date` [MESSAGE] Packages need updating email sent to $MAILTO" >> $LOGFILE
fi
 
stoplogging
exit 0