check-joomla-update.sh

#!/bin/bash
CURL=`which curl`
CURL_OPTS='--user-agent check-joomla-updates-nagios-plugin --insecure'
BASENAME=`which basename`
PROGNAME=`$BASENAME $0`

# Exit codes
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3

function print_usage
{
        echo "Usage: $PROGNAME <URL>" 
}

if [ ! $1 ]; then
        print_usage
        exit $STATE_CRITICAL
fi

# Check that we're getting a 200 OK message for the joomla-version.php file on the remote host. 
response=`$CURL $CURL_OPTS -I $1`
if [[ ( $response != *"200 OK"* && $response != *"HTTP/2 200"* ) ]]; then
        echo 'CRITICAL - Checker Script not installed on remote host'
        exit $STATE_CRITICAL
fi


result=`$CURL $CURL_OPTS -s $1`

if [ $? != 0 ]; then
        echo 'CRITICAL - Check plugin does not work. Maybe you need to install curl.'
        exit $STATE_CRITICAL
else
        status=`echo $result | cut -d\# -f1`
        text=`echo $result | cut -d\# -f2`
        echo "Joomla $status - $text"

        case "$status" in
                CRITICAL)
                        exit $STATE_CRITICAL
                        ;;
                WARNING)
                        exit $STATE_WARNING
                        ;;
                OK)
                        exit $STATE_OK
                        ;;
        esac
fi