check_hard_errors

#!/usr/bin/env bash
# Copyright 2010-2012 Voxer IP LLC. All rights reserved.
# License: MIT
#
# Check for hard errors with kstat nagios style
#
# Author: Dave Eddy <dave@voxer.com>

usage() {
  echo "Version $VERSION"
  echo " "
  echo Usage
  echo "./check_hard_errors [-b sd0<,sd1><,sd2><,...>]"
  echo " "
  echo "    -s  : don't consider listed devices (comma separated)"
  echo "    -h  : this help"
  echo " "
  exit 1
}

# blacklisted vendors
skipvendors=('KVM' 'TEAC')

# blacklisted sd
#skipsd=('1' '2' '3')

while getopts "b:h" opt; do
  case $opt in
    b)
      skipsd=$OPTARG
      ;;
    h)
      usage
      ;;
  esac
done


# Get a list of devices
sds=$(kstat -l sderr:::class | awk -F: '{print $2}')

# Function to extract a value from kstat
get_kstat() {
	IFS=$'\t' read _ value _ < <(kstat -p "$1")
	read value <<< "$value"
	echo "$value"
}

ret=0
err=''
# Loop the devices
while read sd; do

	skip=false

	# Chesk if the sd is blacklisted
	IFS=',' read -ra ARR <<< "$skipsd"
        for v in "${ARR[@]}"; do
                if [[ "sd$sd" == "$v" ]]; then
                        skip=true
                        break
                fi
        done
        $skip && continue

	# Check the vendor, skip it if it's blacklisted
	vendor=$(get_kstat "sderr:$sd::Vendor")

	for v in "${skipvendors[@]}"; do
		if [[ "$vendor" == "$v" ]]; then
			skip=true
			break
		fi
	done
	$skip && continue

	# Check for hard errors
	hard_errors=$(get_kstat "sderr:$sd::Hard Errors")
	if (( hard_errors > 0 )); then
		# Append to `err` string
		err=${err:-critical:}
		err="$err sd $sd: $hard_errors hard errors;"
		ret=2
	fi
done <<< "$sds"

echo "${err:-ok: no hard errors found}"
exit "$ret"