#!/bin/bash
set -e

DEVICE=/dev/sdb
MAPPED=backup

if [ "$EUID" -ne 0 ]; then
    echo "Need to be root" >&2
    exit 1
fi

case "$1" in
    mount)
	cryptsetup open "$DEVICE" "$MAPPED"
	mount /dev/mapper/"$MAPPED" /mnt
	;;
    umount)
       	umount /mnt
	cryptsetup close "$MAPPED"
	;;
    *)
	echo "Unknown argument $1"
	exit 1
	;;
esac