NagiosAndCruiseControl - CruiseControl

I wrote a small plugin for nagios (http://www.nagios.org/) to monitor whether CruiseControl runs or hangs. It depends
on a installed lynx. Here it is:

 #!/bin/sh 
 PATH=/bin:/usr/bin:/usr/local/bin
 # parse arguments
 if [ $# -lt 3 ]; then
    echo "usage: check_cruisecontrol -H host pause"
    exit 1
 fi
 host=$2
 pause=$3
 # get current state and number of projects
 noprojects=0
 while true; do
    url="http://${host}:8000/getattribute?objectname=CruiseControl%20Manager:id=unique&attribute=Projects&format=collection&template=viewcollection"
    if [ $noprojects -gt 0 ]; then
	url="${url}&start=${noprojects}"
    fi
    lynx -source ${url} > /tmp/check_cruisecontrol-$$-$noprojects
    if [ $? -ne 0 ]; then
	echo "CruiseControl CRITICAL: Unknown host!"
	exit 2
    fi
    grep net\.sourceforge\.cruisecontrol\.Project /tmp/check_cruisecontrol-$$-$noprojects > /dev/null
    if [ $? -ne 0 ]; then
	break
    fi
    noprojects=`expr $noprojects + 30` 
 done
 # get current state
 sleep $pause
 project=0
 while [ $project -lt $noprojects ]; do
     url="http://${host}:8000/getattribute?objectname=CruiseControl%20Manager:id=unique&attribute=Projects&format=collection&template=viewcollection"
    if [ $project -gt 0 ]; then
	url="${url}&start=${project}"
    fi
    lynx -source ${url} > /tmp/check_cruisecontrol-$$-${project}-d
    diff /tmp/check_cruisecontrol-$$-$project /tmp/check_cruisecontrol-$$-${project}-d > /dev/null
    if [ $? -gt 0 ]; then
	rm /tmp/check_cruisecontrol-$$-*
	echo "CruiseControl OK: -"
	exit 0
    fi
    project=`expr $project + 30` 
 done
 rm /tmp/check_cruisecontrol-$$-*
 echo "CruiseControl CRITICAL: It hangs!"
 exit 2