Tombautosyncviasshfs

######################DISCLAIMER######################

THE CODE IN THIS PAGE IS HORRIBLE AND DISGUSTING!!!

JUST USE IT IF YOU UNDERSTAND IT AFTER READING AND YOU WANT TO DEBUG

######################################################

Scenario

We have two laptop: a big one and a netbook and we need to share a tomb with personal settings and data.

Description

Unfortunately, we can't just use a "shared" tomb, because tomb cannot be mounted by more than one computer. Furthermore, tomb has (still) no way to use a lock. So, we need to do it ourselves with an external lock (just aside to the tomb).

What we do is (periodically):

1. acquiring the lock
2. mounting the remote tomb
3. using unison to do sync
4. unmounting
5. releasing the lock

The HORRIBLE code

Login Script

#!/bin/bash
# LOGIN SCRIPT

lockfile="/local/mountpoint/tomb.lock"

imgpath=`zenity --file-selection --text='Choose an image file whith an embedded key' --title='Select File'`

tomb exhume /tmp/local.tomb $imgpath

(flock 5
if ! tomb open /path/to/local.tomb -k /tmp/local.tomb.key; then
    zenity --error --text='Imposible to mount local tomb!' --title='Horror!'
    return 1
else
    zenity --notification --text='Local tomb correctly mounted'
fi

if sshfs remote.server:/ /local/mountpoint/; then
    tomb open /local/mountpoint/remote.tomb -k /tmp/local.tomb.key
    zenity --notification --text='Remote tomb correctly mounted'
else
    zenity --error --text='Impossible to mount remote tomb!' --title='Horror!'
    return 1
fi
) 5> $lockfile

Post-Hook in remote Tomb

#!/bin/bash
# POST-HOOK IN REMOTE TOMB

remotetomb="/media/remote.tomb/"
localtomb="/media/local.tomb/"

if unison $remotetomb $localtomb;then
	zenity --notification --text='Data sync success'
else
	zenity --error --text='Data sync failed!' --title='Horror!'
	return 1
fi

Logout Script

#!/bin/bash
#LOGOUT SCRIPT 

lockfile="/local/mountpoint/tomb.lock"

wipe -f -s /tmp/local.tomb.key

(flock 5
if tomb close all; then
	zenity --notification --text='Tombs closed your bones will rest in peace.'
else
	zenity --error --text='Problems closing tombs!' --title='Horror!'
	return 1
fi
) 5> $lockfile

Cron script

#!/bin/bash
# CRON SCRIPT

remotetomb="/media/remote.tomb/"
localtomb="/media/local.tomb/"
lockfile="/local/mountpoint/tomb.lock"

(flock 5
if !ping -c 1 remote.server;then
	return 1
elif  !mountpoint /local/mountpoint/; then
	if sshfs remote.server:/ /local/mountpoint/; then
		tomb open /local/mountpoint/remote.tomb -k /tmp/local.tomb.key;
			unison $remotetomb $localtomb;
	fi
fi
) 5> $lockfile