#!/bin/bash
# Script Name: check_updates_deb
# Author Name: Matt McKinnon
# Date: 7th June 2016
# Description: For use on Debian Based Systems
# 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.

#
# Make user configuration changes in this section
#

MAILTO="support@comprofix.com"
MAILFROM="support@comprofix.com"
THISSERVER=$(hostname -f)
SMTP="mail.comprofix.com"

AUTOUPDATE="no"
LOGFILE="/var/log/server_maint.log"
THISSERVER=$(hostname -f)

#
# End of user configuration section
#

DASHES="---------------------------------------------------------------------------------"
DASHES2="================================================================================="


# Check if the script is being run as root exit if it is not.

if [ $(id -u) -ne 0 ]
then
echo "You need to be root to run this script."
 exit 1
fi

startlogging() {
  echo $DASHES2 >> $LOGFILE
  echo "$0 started running at $(date)" >> $LOGFILE
  echo $DASHES2 >> $LOGFILE
}

stoplogging() {
  echo "$(date) [MESSAGE] $0 finished runnning" >> $LOGFILE
  echo $DASHES >> $LOGFILE
}

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
}

send_error_email() {
sendemail -o tls=no -s $SMTP -t $MAILTO -f "$THISSERVER <$MAILFROM>" -u "[$THISSERVER] There was an error whilst running $0" -m "

Hello,

Whilst running the update script ($0) on $THISSERVER there was a problem.

[ERROR] "$1" failed to run

Please log in via ssh (e.g. ssh root@$(hostname -f)) and check the log file:

vim $LOGFILE

Regards." -q

}

startlogging

apt-get clean > /dev/null
check_return "apt-get clean"

apt-get update > /dev/null
check_return "apt-get update"

if [[ "$AUTOUPDATE" == "yes" ]]
then
  apt-get -yqq upgrade > /dev/null
  check_return "apt-get -yq upgrade"
else
  PACKAGES_TO_BE_UPGRADED=$(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

echo "
Hello,

Packages have been downloaded onto $THISSERVER.

$PACKAGES_TO_BE_UPGRADED

To update the server log in via ssh (e.g. ssh root@$(hostname -f)) and run the following command:

apt-get upgrade

See the logfile for more info: vim $LOGFILE

Regards. " >/tmp/servermail.msg

sendemail -o tls=no -s $SMTP -t $MAILTO -f "$THISSERVER <$MAILFROM>" -u "[$THISSERVER] server may need some updates applied" -m "$(cat /tmp/servermail.msg)" -q


  echo "$(date) [MESSAGE] Packages need updating email sent to $MAILTO" >> $LOGFILE
fi

stoplogging
exit 0