.dotfiles/home/bin/dbvault

#!/usr/bin/env python

"""dbvault: Dropbox Encrypted Folders

This script makes it easy to set up, mount and unmount encrypted folders for use
in Dropbox. It depends on fuse-encfs in Linux.

To initialize it in a new Dropbox installation:

    $ dbvault init

To mount later:

    $ dbvault mount

And unmount:

    $ dbvault umount

--Kirsle
"""

from __future__ import print_function
import sys
import os
import os.path
import subprocess

# Relevant paths.
# home      = $HOME
# dropbox   = $HOME/Dropbox         (your Dropbox folder)
# encrypted = $HOME/Dropbox/.vault  (your encrypted folder inside Dropbox)
# mount     = $HOME/Dropbox Vault   (mount point when accessing folder; OUTSIDE of Dropbox root!)
home      = os.environ["HOME"]
dropbox   = os.path.join(home, "Dropbox")
encrypted = os.path.join(dropbox, ".vault")
mount     = os.path.join(home, "Dropbox Vault")

# Test for enc-fs.
if subprocess.call("which encfs >/dev/null 2>&1", shell=True) != 0:
    print("You require fuse-encfs to use this script.")
    sys.exit(1)

if len(sys.argv) == 1:
    print("Usage: dbvault <action>")
    print("")
    print("To set up for the first time (and create ~/Dropbox/.vault):")
    print("    $ dbvault init")
    print("")
    print("To mount the encrypted folder (to ~/Dropbox Vault):")
    print("    $ dbvault mount")
    print("")
    print("To unmount the folder when you're done:")
    print("    $ dbvault umount")
    print("")
    print("The paths used by this script:")
    print("* Your home directory:                 ", home)
    print("* Your Dropbox folder:                 ", dropbox)
    print("* Your encrypted folder inside Dropbox:", encrypted)
    print("* Your mount point OUTSIDE Dropbox:    ", mount)
    sys.exit(1)

def die(message):
    print(message)
    sys.exit(1)

def mkdir():
    if os.path.isdir(mount):
        die("Can't create mount point {}: already exists!".format(mount))
    os.mkdir(mount)

def rmdir():
    if not os.path.isdir(mount):
        die("Can't remove mount point {}: doesn't exist!".format(mount))
    os.rmdir(mount)

action = sys.argv[1]
if action == "init":
    # Initialization.
    if not os.path.isdir(dropbox):
    	die("Couldn't find your Dropbox folder. Is it at {}?".format(dropbox))

    # Already initialized?
    if os.path.isdir(encrypted):
        die("Encrypted folder '{}' already exists. dbvault appears to already be initialized.".format(encrypted))

    print("Initializing encrypted folder. I will now run `encfs` to create the folder.")
    print("I recommend that you pick the strongest encryption you think you'll need.")
    mkdir()
    subprocess.call(["encfs", encrypted, mount])

elif action == "mount":
    mkdir()
    result = subprocess.call(["encfs", encrypted, mount])
    if result != 0:
        print("An error happened when trying to mount the filesystem.")
        print("The mount point will be removed.")
        rmdir()

elif action in ["umount", "unmount"]:
    subprocess.call(["fusermount", "-u", mount])
    rmdir()

else:
    die("Unknown action: {}".format(action))

# vim:expandtab