#! /bin/bash

if [ $# -ne 1 ]; then
	echo "Usage: $0 <filename>" >&2
	exit 1
fi

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

ARG=${1%/}
LOOP_DEV=${ARG##*/}

if [ ! -d "/media/$LOOP_DEV" -o ! -b "/dev/mapper/$LOOP_DEV" ]; then
	echo "Not a crypto loop" >&2
	exit 3
fi

su -c "umount \"/media/$LOOP_DEV\" && rmdir \"/media/$LOOP_DEV\" && cryptsetup luksClose \"/dev/mapper/$LOOP_DEV\" && losetup -d \"/dev/$LOOP_DEV\""