#!/bin/bash
#
## FILE: check_nfs.sh
##
## DESCRIPTION: This is a nagios compatible script to checks NFS mounts against what
## 							should be mounted in /etc/fstab and if there is a stale mount.
##
## AUTHOR: Dennis Ruzeski (denniruz@gmail.com)
##
## Creation Date: 1/23/2013
##
## Last Modified: 1/25/2013
##
## VERSION: 1.0
##
## USAGE: ./check_nfs.sh
##        This version takes no arguments
##
## TODO: Improve the check for stale mounts, add command line arguments to provide the ability to
## 			 check mount statut, stale mounts, and latency separately.
#
declare -a nfs_mounts=( $(grep -v ^\# /etc/fstab |grep nfs |awk '{print $2}') )
declare -a MNT_STATUS
declare -a SFH_STATUS
for mount_type in ${nfs_mounts[@]} ; do
	if [ $(stat -f -c '%T' ${mount_type}) = nfs ]; then
		read -t3 < <(stat -t ${mount_type})
			if [ $? -ne 0 ]; then
			SFH_STATUS=("${SFH_STATUS[@]}" "ERROR: ${mount_type} might be stale.")
			else
			MNT_STATUS=("${MNT_STATUS[@]}" "OK: ${mount_type} is ok.")
			fi
		else
		MNT_STATUS=("${MNT_STATUS[@]}" "ERROR: ${mount_type} is not properly mounted.")
fi
done
echo ${MNT_STATUS[@]} ${SFH_STATUS[@]} |grep -q ERROR
	if [ $? -eq 0 ]; then
		RETVAL=2
        echo "CRITICAL - NFS mounts may be stale or unavailable"
	else
		RETVAL=0
        echo "OK - NFS mounts are not reporting any errors"
	fi
unset -v MNT_STATUS
unset -v SFH_STATUS
exit ${RETVAL}