#!/bin/sh

DISK=disk.img
MOUNTPOINT=mnt
OFFSET=1048576

if [ "$(id -u)" -ne 0 ]; then
	echo "must be root"
	exit 1
fi

if mountpoint "$MOUNTPOINT" >/dev/null; then
	echo "unmounting"
	umount "$MOUNTPOINT"
	losetup -D "$DISK"
else
	echo "mounting"
	LOOPDEV="$(losetup -f)"
	losetup "$LOOPDEV" "$DISK" -o "$OFFSET"
	mount "$LOOPDEV" "$MOUNTPOINT"
fi