#!/bin/bash
#
# Give information about the next filesystem check 
#
# 2009-11-08:	initial Version   / Jan Toenjes <mail@jan-toenjes.de>
# 2009-11-09:    changed dumpe2fs to "tune2fs -l" as suggested by kero / Jan Toenjes <mail@jan-toenjes.de>
 
 
# check if skript is run as root for tune2fs 
if [ `id -u` != "0" ] ; then 
  echo ""
  echo "     Usage: $0 /dev/disk"
  echo ""
  echo "     Error: You need to be root to run this skript"
  echo ""
  exit 3
fi
 
 
# check if needed programs are installed
which bc 1>/dev/null 
if [ $? -ne 0 ]; then
  echo "    ERROR: Cant find bc"
  exit 3        
fi        
 
 
# check if we got a parameter 
if [ "$1" == "" ] ; then
  echo ""
  echo "     Usage: $0 /dev/disk"
  echo ""
  echo "     Error: You need to give a valid mounted device as parameter i.e. /dev/sda1" 
  echo ""
  exit 3
fi
 
 
 
 
# check if the device given as a parameter exists
DEVEXIST=`mount | grep -ir "$1" | grep "/dev/" | wc | awk {'print $1'}`
if [ "$DEVEXIST" == "0" ] ; then
  echo ""
  echo "     Usage: $0 /dev/disk/"
  echo ""
  echo "     Error: The given parameter  \"$1\"  is not a valid mounted device."
  echo ""
  exit 3
fi
 
 
 
# get remaining mounts
MOUNTCOUNT=`tune2fs -l $1 2>&1 | grep "Mount count:" | awk {'print $3'}`
MAXIMUMMOUNTCOUNT=` tune2fs -l $1 2>&1 | grep "Maximum mount count:" | awk {'print $4'}`
REMAININGMOUNTS=`echo $MAXIMUMMOUNTCOUNT-$MOUNTCOUNT|bc`
 
 
 
# check if we have a fsck after a specific time value and give wanted information
TIMECHECK=`tune2fs -l $1 2>&1 | grep "Check interval:" | awk {'print $3'}`
if [ "$TIMECHECK" == "0" ] ; then
  echo "The next filesystem check of $1 will be after another $REMAININGMOUNTS mounts."
 
else
  NEXTCHECKAFTER=`tune2fs -l $1 2>&1 | grep "Next check after:" | sed 's/Next check after:[ \t]*$//g'`
  echo "The next filesystem check of $1 will be on $NEXTCHECKAFTER or after another $REMAININGMOUNTS mounts."
 
fi