#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# Makes a USB drive containing a gpg key fragment
#
# License
# =======
#
# Copyright (C) 2015 Bob Mottram <bob@robotics.uk.to>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.


if [ ! $1 ]; then
   echo 'Specify a drive, such as sdb, sdc, etc'
   exit 1
fi

USB_DRIVE=/dev/${1}

echo "Formatting $USB_DRIVE as LUKS"
cryptsetup -y -v luksFormat ${USB_DRIVE}
if [ ! "$?" = "0" ]; then
    echo "Failed to format $USB_DRIVE as LUKS"
    exit 36823
fi
cryptsetup luksOpen ${USB_DRIVE} encrypted_usb
if [ ! "$?" = "0" ]; then
    echo "Failed to open LUKS formatted drive $USB_DRIVE"
    exit 37232
fi
mkfs.ext4 /dev/mapper/encrypted_usb
if [ ! "$?" = "0" ]; then
    cryptsetup luksClose encrypted_usb
    echo 'Format of drive $USB_DRIVE failed'
    exit 73218
fi
sleep 2
cryptsetup luksClose encrypted_usb
if [ -f /dev/mapper/encrypted_usb ]; then
    rm -rf /dev/mapper/encrypted_usb
fi
echo 'Format completed'
exit 0