tcplay script

Recently, when I was using TrueCrypt in Arch Linux to mount a truecrypt container file, it was very slow to mount the container. Furthermore, I also read that the TrueCrypt is discontinued.

Therefore, I decided to use the tcplay. However, it is a command-line. Arch Linux wiki page shows a good tutorial on how to use tcplay.

When using tcplay in Linux, unlike mounting the folder like encfs, tcplay requires losetup for loop device. Thus, it involves 3 steps to mount a truecrypt container: i) setup loop device, ii) setup device-mapper with tcplay, and iii) mount. Consequently, to unmount the truecrypt containter need to reverse these 3 steps.

In order to make my life easier, I wrote a simple script as following. Feel free to modify it.

[code language=“bash”] # @author Allen Choong # @date    2014-06-29 # @version    1.0.1 # # Easy mount the truecrypt encryptinog by using tcplay. # Assuming the truecrypt mounting name does not have whitespace. # # Changelog: # 2014-06-29    1.0.1    Add display help if there is no argument # 2014-06-02    1.0    Initial

tc_mount() { lo=`losetup -f` losetup “$lo” “$1” tcplay -m “`basename “$1”`” -d “$lo” mount “/dev/mapper/`basename “$1”`” “$2” }

tc_unmount() { echo -en “Unmount … " umount “/dev/mapper/$1” lo=`losetup -l | grep “$1” | cut -d ’ ’ -f 1` dmsetup remove “$1” losetup -d “$lo” echo “OK!” }

mklist() { start="$1” num="$2" ret="$1" for ((i=1;$i<=$num;i++)) ; do ret+=$(echo " `expr $start + $i`") done echo $ret }

show_mount() { mount|grep ‘/dev/mapper’ |while read l ; do num=`echo “$l” | tr ’ ’ ‘\n’ | wc -l`; cutnum=$(mklist 3 `expr $num - 6`) echo “$l” | cut -d ’ ’ -f “1 $cutnum” | sed -e ’s/\s/ => /’ done }

#Get arguments for ((i=0;i<=$#;i++)) ; do args[$i]=${!i} done

action=“mount”

#Print help if [ $# == “0” ] ; then   echo “This command requires root privilege.”   echo “Usage:”   echo “`basename $0` TRUECRYPT_CONTAINER MOUNT_POINT”   echo ""   echo “To list the mounted container:”   echo “`basename $0` -l”   echo ""   echo “To unmount (requires root):”   echo “`basename $0` -u CONTAINER_FILENAME”   echo “where CONTAINER_FILENAME is the device mapper name”   echo ""   exit fi

for ((i=1;i<=$#;i++)) ; do case ${args[$i]} in -l) show_mount exit ;; -u) unmnt=`echo ${args[$i+1]}` action=“unmount” ;; esac done

if [[ “$action” == “mount” ]] ; then tc_mount “$1” “$2” elif [[ “$action” == “unmount” ]] ; then tc_unmount “$unmnt” fi [/code]

Update (2014-06-29): In order to use this script, if you have a file called foobar.tc (already make file system),

[code language=“bash”]sudo tcplay.sh foobar.tc /path/to/mnt[/code]

After this, you can list the mounted point as,

[code language=“bash”]tcplay.sh -l[/code]

To unmount the container,

[code language=“bash”]sudo tcplay.sh -u foobar.tc #where the foobar.tc is the device mapper name, not the path to the file[/code]