#!/bin/bash
EXIT_CODE=1
DEVICE=$1
if [[ -z $DEVICE ]]; then
        DEVICE=/dev/dvd
fi

if [[ ! -b $DEVICE ]]; then
        echo "Device $DEVICE doesn't exist" >&2
        exit 1
fi

while [[ $EXIT_CODE != 0 ]]; do
        /usr/local/bin/disc_id $DEVICE 2> /dev/null
        EXIT_CODE=$?

        if [[ $EXIT_CODE != 0 ]]; then
                sleep 1
        fi
done