#!/bin/bash
#############
#Author: whbakus
#This is a simple nagios plugin to monitoring the disk usage percentage, when you are working inside LXC container on proxmox.
#It is based on	df command to gather info about	disk and awk to	manipulate output.
#
#Inside LXC container the disk info is misaligned from inside and outside container.
#For example for  my LXC container from host I read (from lvs command):
#  vm-101-disk-1 LSize:36.00g Data% 68.99
# this values are in Gib (Gibibyte)
#From inside container with dh command I read:
# Filesystem: /dev/mapper/pve-vm--101--disk--1 Size 38G Use% 51%
# and this values are in more useful format GB (Gigabyte). I need this values!
# 
#
#
###########

awk=/bin/awk
warning_th=$1
critical_th=$2


function calc() {
warning_th=$1
critical_th=$2

mounted_on=$(df -Hl | awk '/pve-vm/ {print $6}')
echo $mounted_on
use=$(df -Hl  | awk '/pve-vm/ {print substr($5,1, length($5)-1)}')
Avail=$(df -Hl  | awk '/pve-vm/ {print $4}')
Used=$(df -Hl  | awk '/pve-vm/ {print $3}')
Size=$(df -Hl  | awk '/pve-vm/ {print $2}')

if [ "$use" -gt "$critical_th" ]; then
  echo "SERVICE Critical: Mounted: $mounted_on - Total Size: $Size - Used: $Used - Avail: $Avail - %Used: $use"
  exit 2
fi

if [ "$use" -gt "$warning_th" ]; then
  echo "SERVICE Warning: Mounted: $mounted_on - Total Size: $Size - Used: $Used - Avail: $Avail - %Used: $use"
  exit 1
fi 
if [ "$use" -lt "$warning_th" ]; then
 echo "SERVICE OK: Mounted: $mounted_on - Total Size: $Size - Used: $Used - Avail: $Avail - %Used: $use"
 exit 0
fi
}
#condition warning_th < critical_th
#is warning if Used > warning_th
#is critical if Used > critical_th
#is OK if Used < warning_th

while getopts w:c: option
do 
case "${option}"
in
c) critical_th=${OPTARG};;
w) warning_th=${OPTARG};;
esac
done

if [ $warning_th -gt $critical_th ] || [ $warning_th -gt 100 ] || [ $critical_th -gt 100 ]
then
	echo "Error passing params"
	echo "Usage: check_disk_on_lxc -w 70 -c 90"
	echo "-w warning threshold -c critical threshold"
	echo "the thresholds's value is comparised with disk's usage percets"
	exit 1
else
   calc  $warning_th $critical_th
fi