bash script for brute-force loading and unloading tapes from a Quantum Superloader 3 via the HTML management console

autoloader.sh

#!/bin/bash
wget="/usr/local/bin/wget"
username="user"
password="pass"
IP="10.0.0.1"

#this is a file used to stash the origin slot for the tape currently in the tape drive
homefile="$SCRIPTDIR/drive-status.txt"

SCRIPTDIR=$( cd "$( dirname "$0" )" && pwd )
HOMESLOT=$(<$homefile)
DRIVE="17" 
scripted="1"

# Slots 1 - 16
# Drive is 17
# Mailslot (Tape Ejecter) is 18
# Picker is 19

#should be able to:
	#load from slot to drive  		autoloader.sh -l 3
	#unload from drive to originating slot	autoloader.sh -u
	#move from drive to given slot		autoloader.sh -m 7
	#force unload to a given slot		autoloader.sh -f 2



function movetape {
	arg1=$1
	arg2=$2
	arg3=$3
	echo "moving from $arg1 to $arg2 (home= $HOMESLOT)"


	exiter="1"
	while [ "$exiter" -ne "4" ]; do
		#a "no data received" page signifies success and gives us exit code 4
		#any other page (302, for example) signifies failure, so we should try again
		$wget -q --http-user=$username --http-password=$password "http://$IP/move.cgi?from=$arg1&to=$arg2" -O /dev/null --max-redirect=0 -t 1  > /dev/null 2>&1
		exiter=$?
		sleep 2 #add a little delay between tries
		
		#this should also have a timeout after five tries or so with a failure message
		
	done

	if [ "$arg2" -eq "$DRIVE" ]; then
		HOMESLOT=$arg1
		echo $HOMESLOT > $homefile
		echo "tape from $HOMESLOT loading in drive"
	else
		HOMESLOT=""
		echo $HOMESLOT > $homefile
		echo "tape unloading to $arg2, drive now empty"
	fi

	
	#wait a while for the drive to work - two minutes seems about right
	echo "waiting two minutes"
	sleep 120
	if [ -z $arg3 ]; then
    #send a growl notification to me
    ssh 10.0.0.2 "/usr/local/bin/growlnotify '$HOSTNAME alert' -m 'hopefully done moving tapes' -s"
		echo "done moving"
	fi
}

if [ -z $HOMESLOT ]; then
	echo "drive is empty"
else
	echo "drive is loaded from slot $HOMESLOT"
fi

while getopts "ul:m:f:s" opt; do
	case $opt in
		s)
			#this variable is boolean backwards - if we're running this from a script, we use the -s switch
			#and it won't send growl notifications
			scripted=""
			;;
		l)
			#check to see if homeslot is empty
			if [ -z $HOMESLOT ]; then
				#if it's empty, load normally
				movetape $OPTARG $DRIVE
			else
				# if it's not empty, there's a tape in the drive
				#check to see if homeslot has desired tape number
				if [ "$HOMESLOT" -eq "$OPTARG" ]; then
					#if so, echo and do nothing
					echo "the tape from slot $OPTARG is already in the drive (according to $homefile)"
				else
					#if not, unload current tape to home and wait
					movetape $DRIVE $HOMESLOT 
					#then load desired tape and write to homefile
					movetape $OPTARG $DRIVE $scripted
				fi
			fi
			;;
		u)
			#check to see if homefile is empty
			if [ -z $HOMESLOT ]; then
				echo "there is no tape in the drive (according to $homefile)"
			else
				movetape $DRIVE $HOMESLOT $scripted
			fi
			;;
		m)
			#unload tape to specific slot, rather than its homeslot
			#will be rarely used
			#check to see if homefile is empty
			if [ -z $HOMESLOT ]; then
				#if so, comment
				echo "there is no tape in the drive (according to $homefile)"
			else
				movetape $DRIVE $OPTARG $scripted
			fi
			;;
		f)
			#force unload to specific slot
			#used when the homefile is incorrectly empty
			echo "forcing unload to $OPTARG from drive"
			movetape $DRIVE $OPTARG $scripted
			;;
		\?)
			echo "Invalid option: -$OPTARG"
			exit 1
			;;
	esac
done