Nagios check for zfs snapshot creation date, checks the age of the most recent snapshot

check_snapshot_creation

#!/bin/sh

FSNAME=$1
WARNAGE=$2
CRITAGE=$3

NOW=$(/bin/date +%s)

ZFS="sudo /sbin/zfs"

# get all snapshots of zfs filesystem and search for newest snapshot
CREATIONDATE=$($ZFS get creation -Hpr -t snapshot $FSNAME | /bin/awk 'BEGIN {max = 0} {if ($3>max) max=$3} END {print max}')

DIFF=$((NOW-CREATIONDATE))

if (( WARNAGE > CRITAGE )); then
  echo "usage: $0 <fsname> <warntime> <crittime>"
  echo " warning time must be smaller than crittime"
  exit 3
fi

RETVAL=3 # UNKNOWN

MSG=""

if (( DIFF > CRITAGE )); then
  RETVAL=2 # CRITICAL
  MSG="CRITICAL:"
elif (( DIFF > WARNAGE )); then
  RETVAL=1 # WARNING
  MSG="WARNING:"
else
  RETVAL=0 # OK
  MSG="OK:"
fi

DATEFMT=$(date -d @$CREATIONDATE +"%Y-%m-%dT%H:%M:%SZ")

echo "$MSG snapshot $FSNAME created $DATEFMT" 

exit $RETVAL