#!/bin/bash

if [ "$1" = "-h" ]
    then 
        echo 
        echo 
        echo "do-plication <option> (<n>) [directory to back up]"
    	echo
    	echo "Options:"
    	echo 
    	echo "-a append arcive to the back of the tape no n needed"
        echo "-c checks (lists) the contents of the n'th arcive put - as argument for directory to back up "
    	echo "-f Override the n'th arcive"
        echo "-l Load the n'th arcive"
        echo 
        echo "-e enable encription {do-plication -e  [path to key file] [ key file descriptoin(only if key not alreadey created)}"
        echo 
        echo 
        echo 
    exit 0
fi

if [ "$1" = "-e" ]
    then 
        sudo ls "$2" > /dev/null
        if [ $? == 0 ]
            then 
                echo "key fount using key"
                sudo stenc -f /dev/nst0 -e on -k "$2" -a 1 --ckod
            else 
                echo "key not fount creating key"
                sudo stenc -g 256 -k "$2" -kd "$3";
                sudo stenc -f /dev/nst0 -e on -k "$2" -a 1 --ckod
        fi 
    exit 0 
fi

# Going to the right directory 
# cd /media

case "$1" in 
    # overwrite the tape from the begining
    -a) 
        sudo mt -f /dev/nst0 eod;
        sudo mt -f /dev/nst0 status;
        echo "your arcive will be the file number"
        sudo screen -dmS do-plication tar -cvf /dev/nst0 "$3"
        true
    ;;

    -c)
        sudo mt -f /dev/nst0 asf "$2";
        sudo tar tvf /dev/st0 
        true 
    ;;

    -f)
        sudo mt -f /dev/nst0 asf "$2";
        echo "your arcive wil be $2";
        sudo screen -dmS do-plication tar -cvf /dev/nst0 "$3"
        true
    ;;

    -l) 
        sudo mt -f /dev/nst0 asf "$2";
        sudo screen -dmS do-plication tar xvf /dev/nst0  -C "$3"
        true
esac
exit $?