#!/usr/bin/env bash

check_required() {
  type hostname &> /dev/null || { echo "Requiring 'hostname' but it's not installed"; exit 1; }
  type mailx &> /dev/null || { echo "Requiring 'mailx' but it's not installed"; exit 1; }
  type wall &> /dev/null || { echo "Requiring 'wall' but it's not installed"; exit 1; }
}

check_required

HOSTNAME=$(hostname)
echo "$SMARTD_MESSAGE" | mail -s "[smartd $HOSTNAME] $SMARTD_FAILTYPE" "$SMARTD_ADDRESS"
wall "$SMARTD_MESSAGE"