#!/bin/sh
# Copyright (C) 2007 Krzysztof Kozlowski
#   License: GNU General Public License version 2
#            http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# version 2 as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# Ostatnia zmiana: 11.02.2007
#
# Mount cryptsetup-loop file
#
#

. /home/kozik/bin/kozik_functions

usage () {
  echo "Usage: $(basename $0) file mount_point"
  exit 127
}

if [ $# -ne 2 ]; then
  usage
fi

FILE=$1
MOUNT_POINT=$2
DM_NODE_NAME=`basename "${FILE}"`
CRYPT_NODE_NAME="${DM_NODE_NAME}.crypt"

test -d "${MOUNT_POINT}" || die "Mount point not found!"
test -f "${FILE}" || die "File to mount not found!"

mount -v | grep "${MOUNT_POINT}" && die "${MOUNT_POINT} seems to be already mounted."

LOOP_DEV=`find_free_loop_dev`
if [ "$LOOP_DEV" != "" ]; then
  echo "Using loop device: ${LOOP_DEV}"
  modprobe aes-i586
  modprobe dm-crypt
  losetup "${LOOP_DEV}" "${FILE}" || die "Could not losetup ${LOOP_DEV}"
  cryptsetup -c aes create "${CRYPT_NODE_NAME}" "${LOOP_DEV}" || die "Could not cryptsetup ${DM_NODE_NAME}.crypt"
  mount "/dev/mapper/${CRYPT_NODE_NAME}" "${MOUNT_POINT}"
  STATUS=$?
  if [ $STATUS -ne 0 ]; then
    cryptsetup remove "${CRYPT_NODE_NAME}"
    losetup -d "${LOOP_DEV}"
  fi
  exit $STATUS
else
  echo "Could not find suitable loop device!"
fi