#!/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: 06.12.2007
#
# Umount cryptsetup-loop file
#
#

. /home/kozik/bin/kozik_functions

usage () {
  echo "Usage: $(basename $0) [mount_point|crypt_node_name]"
  exit 127
}

if [ $# -ne 1 ]; then
  usage
fi

MOUNT_POINT=${1%/}
ABSOLUTE_PATHNAME=`absolute_pathname "${MOUNT_POINT}"`
if [ "$ABSOLUTE_PATHNAME" == "" ]; then
  # It is crypt_node_name?
  CRYPT_NODE_NAME=${MOUNT_POINT}
  CRYPT_NODE_FILEPATH="/dev/mapper/${CRYPT_NODE_NAME}"
  if [ -b "${CRYPT_NODE_FILEPATH}" ] || [ -c "${CRYPT_NODE_FILEPATH}" ]; then
    MOUNT_POINT=""
  else
    die "Could not find mount point or crypt node name $1"
  fi
else
  CRYPT_NODE_FILEPATH=`mount | grep "${MOUNT_POINT}" | cut -f 1 -d ' '`
  CRYPT_NODE_FILEPATH=`trim_string "${CRYPT_NODE_FILEPATH}"`
  CRYPT_NODE_NAME=`basename "${CRYPT_NODE_FILEPATH}"`
fi
LOOP_DEV=`cryptsetup status "${CRYPT_NODE_NAME}" | grep device | sed -e 's/device://'`
LOOP_DEV=`trim_string "${LOOP_DEV}"`

if [ "${CRYPT_NODE_NAME}" == "" ]; then
  die "Could not find dm-crypt node name!"
fi
if [ "${LOOP_DEV}" == "" ]; then
  die "Could not find loop device name!"
fi

if [ "${MOUNT_POINT}" != "" ]; then
  echo "Umounting ${MOUNT_POINT}..."
  umount "${MOUNT_POINT}" || die "Could not umount ${MOUNT_POINT} on ${CRYPT_NODE_NAME} - ${LOOP_DEV}"
fi
echo "Removing dm-crypt node ${CRYPT_NODE_NAME}..."
cryptsetup remove "${CRYPT_NODE_NAME}"
echo "Removing loop device ${LOOP_DEV}..."
losetup -d "${LOOP_DEV}"
exit $?