#!/bin/bash
#
# Replace the "[VOLUME_ID]" part with the volume label or identification
# (ID) of your external USB hard drive. The point of this is to be able
# to store configurations and resources tied to a program on an external
# hard drive. Some applications require a lot of assets, resources, 
# large databases, and etc.. Also, you may be wanting to run a program
# but keep the required/associated files on an encrypted hard drive,
# partition, or disk image.
#
# Do not forget to replace the "Program" and "Program Name" parts, as 
# well as paths.
#
# This script is what you would tell a *.desktop file to use, such as
# Exec=sh -c "/path/to/thisScript.sh"
#
# If the program in question does not have any command-line arguments
# to specify a different location to a configuration, creat a symbolic
# link to the file or folder from the USB hard drive to the system
# hard drive.
#
# If 'libnotify' is not installed, 'xterm' will pop-up, using 'dialog'
# to display a message instead if needed.
#
# Requires 'xterm' and 'dialog' to be installed, but most GNU/Linux
# systems have these by default.
#

if [ ! -d "/media/$USER/[VOLUME_ID]" ]
then
    if [ -f '/usr/bin/notify-send' ]
    then
        notify-send 'Hard drive not mounted.'
        notify-send 'Minetest will not start.'
    else
        xterm -T 'Program Name: Whoops...' -e dialog --msgbox "Hard drive not mounted.\Program will not start." 0 0
    fi
else
    sh -c "/path/to/program"
fi