#!/bin/bash

# check_mounted - plugin for nagios to check that a partition is mounted
#
# Based on check_glusterfs_mount by Ioannis Aslanidis and modified by Thomas Blanchin
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.

timelimit=5  # We allow 10 seconds for ls to rn. If it does not, we consider it has hanged.
### NOT NECESSARY AS ALL PARAMETERS ARE PATH TO CHECK
#TOTALPARAMS=1 # Total number of expected parameters.
minlines=2    # If we find less that these number of lines, we understand that there was an error.
error=0

TryList()
{
  # The path to check.
  path=${1}
  # List the contents of the path and verify that the output is correct
  numlines=$(/bin/ls -l ${path} | /usr/bin/wc -l)
  if [ ${numlines} -lt ${minlines} ]; then
    error=2
  fi
}

TimerOn()
{
  /bin/sleep ${timelimit} && /usr/bin/kill -s 14 ${$} &
  # Waits some seconds, then sends sigalarm to script.
}

Int14Vector()
{
  echo CRITICAL: Mount point does not seem to work. Could not list the contents!
  exit 2
}
 
# Timer interrupt (14) subverted for our purposes.
trap Int14Vector 14

### NOT NECESSARY AS ALL PARAMETERS ARE PATH TO CHECK
# Check that the total number of parameters is correct.
#if [ ${#} -ne ${TOTALPARAMS} ]; then
#  echo UNKNOWN: Script was executed with incorrect number of arguments. Check could not be performed.
#  exit 3
#fi

# Start the timer.
TimerOn
# Make the call.
for i in $*
do
    TryList ${i}
done

# Kill the alarm timer, we do not need it any more. (bash will write to stdout about the process that got killed, redirecting makes no sense here)
/usr/bin/kill ${!}

if [ $error -eq 2 ]; then
  # HoHooooo
  echo CRITICAL: Mount point is not working correctly.
  exit 2
elif [ $error -eq 0 ]; then
  # Return success.
  echo OK: Mount seems to be working correctly
  exit 0
fi