Nagios plugin wrapper for long running plugins

cacheslow

#!/bin/bash

# Nagios plugin wrapper for long running plugins

# It returns the last run and re-runs the plugin in background caching the results
# in /etc/nagios/slowplugins

# Examples
#   /usr/lib64/nagios/plugins/cacheslow /usr/lib64/nagios/plugins/check_package_updates
#   /usr/lib64/nagios/plugins/cacheslow /usr/lib64/nagios/plugins/check_package_updates -w 3 -c 10

CACHE_DIR="/etc/nagios/slowplugins"

main() {
	if [ ! -e "${CACHE_DIR}" ]; then
		mkdir -p "${CACHE_DIR}"
	fi

	if [ ! -e "${CACHE_DIR}/${program}-output" ]; then
		echo "First run, caching details"
		daemonize -l ${CACHE_DIR}/${program}.lock -p ${CACHE_DIR}/${program}.pid $me cache $*
		exit 3
	fi

	daemonize -l ${CACHE_DIR}/${program}.lock -p ${CACHE_DIR}/${program}.pid $me cache $* || exit 3
	cat ${CACHE_DIR}/${program}-output
	RC=$(cat ${CACHE_DIR}/${program}-rc)
	exit ${RC}
}


run_real() {
	F=$(mktemp)
	$* > ${F}
	cat ${F} > ${CACHE_DIR}/${program}-output
	rm -f ${F}
	echo $? > ${CACHE_DIR}/${program}-rc
}

if [ "$1" == "cache" ]; then
    me=$0
    shift
    program=$(echo $1|sed 's/.*\///g')
    run_real $*
else
    me=$0
    program=$(echo $1|sed 's/.*\///g')
    main $*
fi