vtape

# Shell script providing an interface to interact with the Virtual Tape Driver.
# It performs various functions depending on the user input.
# Calls appropriate routines defined in the Vtape Library (vtap_lib.o).


#!/usr/bin/bash


case "$1" in
# Case create : Creates a virtual tape media.   
# Usage: vtape.sh -create "media_path" -size "size".
# It gives the media specified by the "media_path" , a virtual tape structure by creating a file of given "size",
# and writing the header information onto it. 
	-create) 
		#[ $# -ne 4 ] && { echo "Usage: vtape -create media_path -size size" ; exit ; }
		
		mkfile $4 $2 ;
	 	
		lofiadm -a $2 /dev/lofi/1 ;

		exec "./vtp_lib.o" "initialize" "$4" ;;	# Calls the initialize routine which writes the header
		

# Case insert : Provides abstraction of inserting the tape media. 
# Usage: vtape.sh -insert "media_path".
	-insert) 
		#[ $# -lt 3 ] && { echo "Usage: vtape -insert media_path" ; exit ; }
			 	
		lofiadm -a $2 /dev/lofi/1 ;
		
		exec "./vtp_lib.o" "insert" ;;


# Case validate: Checks for a valid tape media. 
# Usage: vtape.sh -validate
	-validate)
		exec "./vtp_lib.o" "print_header" ;;	# Call to validate routine which checks whether the media is valid tape 


	-printheader)
		exec "./vtp_lib.o" "print_header" ;;


# Case eject : Provides abstraction of ejecting the tape media. 
# Usage: vtape.sh -eject
	-eject)  
		lofiadm -d /dev/lofi/1 ;
		
		echo "Media ejected successfully!!" ;;


	-backup)
		#[ $# -lt 2 ] && { echo "Usage: vtape -backup file_names" ; exit ; }
		
		exec "./vtp_lib.o" "backup" "$@" ;;
		#shift 1
		#tar -cvf /dev/rmt/0node $@;;

	-restore)
		#[ $# -lt 2 ] && { echo "Usage: vtape -restore file_names" ; exit ; }

		#exec "./vtp_lib.o" "restore" "$@" ;;
		shift 1
                tar -xvf /dev/rmt/0node $@;;

	-show_records)
		#exec "./vtp_lib.o" "show_records" "$@" ;;
		;;

	-show_backups)
		#exec "./vtp_lib.o" "show_backups" ;;
		shift 1
                tar -xvf /dev/rmt/0node $@;;
	
	-fsf)
		#mt -f /devices/pseudo/lyr@1:node fsf $2;;
		exec "./vtp_lib.o" "fsf"  "$2" ;;

	
	-bsf)
		exec "./vtp_lib.o" "bsf" "$2" ;;

	
	-getrecsize)
		exec "./vtp_lib.o" "get_record_size" ;;

esac