encrypted-swap.sh

#!/bin/bash

# How to Enable an Encrypted Swap Partition
# =========================================
# Ubuntu 14.04
#
# I came up with this solution when `ecryptfs-setup-swap` failed to work
# on my system, possibly because I have a GUID Partition Table on my disk.
# So I used the Ubuntu Disks GUI utility to format my swap partition as 
# LUKS+ext4 and then put together this script to enable it on log-in.
#
# /etc/profile.d/encrypted-swap.sh
# --------------------------------

# ### System specific parameters

PARTITION_RAW="/dev/sda10"
PARTITION_UNLOCKED="/dev/mapper/luks-5edddf9e-76b9-4030-9fd3-90502211ace3"

# ### The code
# First, make sure the swap partition isn't already unlocked.

if [[ -z `ls $PARTITION_UNLOCKED` ]];
then
  echo "Unlocking encrypted swap partition..."  
  udisksctl unlock -b $PARTITION_RAW
fi

# Make sure it's not already enabled as a swap device.

if [[ -z `swapon -s | grep $PARTITION_UNLOCKED` ]]
then
  echo "Enabling swap..."
  sudo swapon $PARTITION_UNLOCKED
fi

# To ensure this works for GUI sessions run this script as a 
# "Start-up Application" using the GUI tool for such, or by manually adding a 
# .desktop file to ~/.config/autostart to run this script, e.g., 
#
#     gnome-terminal -e "/etc/profile.d/encrypted-swap.sh"