#!/bin/sh
# vim: set fileencoding=utf-8 ai noet sts=8 sw=8 tw=0:

FILE=''
INTERVAL=60
EXIT=0

usage(){
	ret=$1

	cat <<EOF
$0: usage:
	$0 <options>

	File age checker for nagios.  Will alert if the named file is
	older than the interval (interval default is 60 minutes)

	-h	This help message
	-i	Interval in minutes at which to alert
	-f	File to check
EOF

	exit $ret
}

while getopts f:i:h opt ; do
	case "$opt" in
		f) FILE="$OPTARG" ;;
		i) INTERVAL="$OPTARG" ;;
		h) usage 0
	esac
done

if [ -z "$FILE" ]; then
	echo "Need file argument!" >&2
	usage 1
fi

if [ ! -r "$FILE" ]; then
	printf "state file %s is missing or unreadable\n" $FILE
	exit 2
fi

if [ "$(( $( date +%s ) - $(stat -c %Y $FILE) ))" -gt "$(( $INTERVAL * 60 ))" ]; then
	printf "state file %s is older than %d minutes\n" $FILE $INTERVAL
	exit 2
fi

printf "state file %s OK: updated on %s\n" $FILE "$(stat -c %y $FILE)"