#!/bin/bash
#
# Nagios Filesystem Plugin
#
# Description: Check the filesystem status for ZFS
# Author     : Suraj K Abraham
# Version    : 1.0
#
#

# Usage
if [ $# -lt 3 ]; then
echo "Usage: $0  <zpool> <warning> <critical>"
exit 2
fi

# Filesystem threshold values
Zpool_NAME=$1
FS_WARNING=$2
FS_CRITICAL=$3

zpool list |grep "^$Zpool_NAME " > /dev/null 2>&1
if [ $? -ne 0 ] ; then
   echo "UNKNOWN : zpool $Zpool_NAME is invalid"
   exit 3
fi


if (( $FS_CRITICAL <= $FS_WARNING ))
then
      echo "UNKNOWN : warning:$FS_WARNING critical:$FS_CRITICAL, critical value must be less than the warning value."
      exit 3
fi

ZFS_mountpoint=`zfs list -H -o mountpoint $Zpool_NAME`
ZFS_utilization=`zpool list -H -o capacity $Zpool_NAME | cut -d % -f1`
ZFS_used=`zpool list -H -o used $Zpool_NAME`
ZFS_size=`zpool list -H -o size $Zpool_NAME`
i=$ZFS_utilization
    if [ $i -lt $2 ] ; then
        echo "$ZFS_mountpoint: $i%used - (Used: $ZFS_used/Total: $ZFS_size) ($FS_WARNING%): OK" ; exit 0

    elif [ $i -ge $3 ] ; then
        echo "$ZFS_mountpoint: $i%used - (Used: $ZFS_used/Total: $ZFS_size) ($FS_CRITICAL%): CRITICAL" ; exit 2

    else
        echo "$ZFS_mountpoint: $i%used - (Used: $ZFS_used/Total: $ZFS_size) ($FS_WARNING%): WARNING" ; exit 1
    fi