check_vm_df.sh

#! /usr/bin/env bash

CRITICAL_USE=90
WARNING_USE=80

if [ -d /var/vm ]; then
  VM_DEVICE_DIR="/var/vm/store"
  VM=`echo $1 |sed 's/\.vm\.xeriom\.net//'`
  VM_DEVICE="${VM_DEVICE_DIR}/$VM.img"
else
  VM_DEVICE_DIR="/dev/`hostname |cut -f 1 -d .`"
  VM=$1
  VM_DEVICE="${VM_DEVICE_DIR}/$VM-disk"
fi

if [ ! -e $VM_DEVICE ]; then
  echo "DISK / UNKNOWN: Couldn't find $VM_DEVICE"
  exit 3
fi

FREE=`tune2fs -l $VM_DEVICE |grep 'Free blocks:' |awk '{ print $3 }'`
if [ "0" != "$?" ]; then
  echo "DISK / UNKNOWN: Couldn't get free block count (command failed)"
  exit 3
elif [ -z $FREE ]; then
  echo "DISK / UNKNOWN: Couldn't get free block count (no output)"
  exit 3
fi

TOTAL=`tune2fs -l $VM_DEVICE |grep 'Block count:' |awk '{ print $3 }'`
if [ "0" != "$?" ]; then
  echo "DISK / UNKNOWN: Couldn't get total block count (command failed)"
  exit 3
elif [ -z $TOTAL ]; then
  echo "DISK / UNKNOWN: Couldn't get total block count (no output)"
  exit 3
fi

USAGE=$((100 - ($FREE * 100 / $TOTAL)))

if [ $USAGE -gt $CRITICAL_USE ]; then
  echo "DISK / CRITICAL: ${USAGE}% used"
  exit 2
elif [ $USAGE -gt $WARNING_USE ]; then
  echo "DISK / WARNING: ${USAGE}% used"
  exit 1
else
  echo "DISK / OKAY: ${USAGE}% used"
  exit 0
fi