#!/bin/bash
# script to close a LUKS encrypted container file (use open_container.sh to open)
# -must be run with root privileges
# -start it without any or with 3 arguments: ./open_container.sh /path/to/container mapper_filename /path/to/mount_point
# written by Christian Ulrich (based on a script from http://wiki.ubuntuusers.de/LUKS/Containerdatei)
# version: 0.2
# date: 2011/09/13

run=1
choice=

if test $# -ne 0; then
    if test $# -ne 3; then
	echo "Aufruf des Skripts entweder ohne Argumante oder: ./close_container /Pfad/zum/Container mapper_filename /Pfad/zum/Mountpoint"
	exit 1
    else
	SAFE=$1
	CRYPTNAME=$2
	MNT=$3
    fi
else
    SAFE=/home/christian/privat/encrypted
    CRYPTNAME=container
    MNT=/home/christian/mnt
fi
LOOPDEV=`losetup -a | grep "$SAFE" | sed "s/: .*//"`

echo "close_container.sh v0.2 (by Christian Ulrich)
---------------------------------------------"

while [ $run -ne 0 ]; do
    echo
    echo "Bitte wählen:"
    echo "-------------"
    echo "[1] Pfad zum Container ändern ($SAFE)"
    echo "[2] Dateiname in /dev/mapper/ ändern ($CRYPTNAME)"
    echo "[3] Mount-Pfad ändern ($MNT)"
    echo "---------------------------------------------------"
    echo "[c] Container schließen"
    echo "[q] Script beenden"
    read choice
    case $choice in       
	1 ) echo "Neuen Pfad eingeben oder <return> um abzubrechen (aktueller Pfad: $SAFE):"
	    SAFE_tmp=
	    read SAFE_tmp
	    if [[ -n "$SAFE_tmp" ]]; then #if only <return> was pressed
		SAFE=$SAFE_tmp
	    fi	    
	    ;;
	2 ) echo "Neuen Dateinamen eingeben oder <return> um abzubrechen (aktueller Dateiname: $CRYPTNAME):"
	    CRYPTNAME_tmp=
	    read CRYPTNAME_tmp
	    if [[ -n "$CRYPTNAME_tmp" ]]; then
		CRYPTNAME=$CRYPTNAME_tmp
	    fi	    
	    ;;
	3 ) echo "Neuen Mount-Pfad eingeben oder <return> um abzubrechen (aktueller Pfad: $MNT):"
	    MNT_tmp=
	    read MNT_tmp
	    if [[ -n "$MNT_tmp" ]]; then
		MNT=$MNT_tmp
	    fi	    
	    ;;
	'c' ) run=0 
	    if [ "`losetup -a | grep -c "$SAFE"`" != "1" ]; then 
		  echo "nicht eingehängt"
		  exit
	      fi	      
	      umount $MNT
	      cryptsetup luksClose $CRYPTNAME
	      losetup -d $LOOPDEV
	      echo "Container geschlossen"
	      ;;
        'q' ) run=0;;
	* ) echo "Falsche Eingabe!";;
    esac
done