#!/bin/bash

#This script checks the disk usage of the current
# USB removable drive by executing a df command.
#If the used number of blocks is greater than the
# user defined high water mark,
# Then
#  If the current USB drive path is /media/usbdisk
#   Then copy the usbdisk1 file into the default file
#   Else copy the usbdisk  file into the default file
# Else log the current disk usage
#
#David Welsh
#April 26, 2005

echo "  Start CheckUsbDiskUsage.bash `date -u`"

#Set the execution path
export PATH=$HOME/bin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin

#Set the SEARCH home path
export SHOME=$HOME/search

#Set the number of blocks used for the high water mark
let bhwm=180000000

#get the USB disk mount point
read diskpath < "$SHOME"/diskpath

#execute the disk usage command to get the used number of blocks
let bused=`df -k "$diskpath" |grep dev|awk '{print $3}'`

#Test the number of blocks used verses the high water mark
if [ "$bused" -gt "$bhwm" ]; then
  echo "    $bused > $bhwm so switch diskpath"
  if [ "$diskpath" = '/media/usbdisk' ]; then
    echo "      switching from usbdisk to usbdisk1"
    cp $SHOME/usbdisk1 $SHOME/diskpath
  else
    echo "      switching from usbdisk1 to usbdisk"
    cp $SHOME/usbdisk  $SHOME/diskpath
  fi
else
  echo "    $bused <= $bhwm"
fi

echo "  Stop CheckUsbDiskUsage.bash `date -u`"