.gnupg file backup helper

gnupg_backup

#!/bin/bash

# Helper script used to back up your gnupg directory
#
# Author:  Ben Dechrai <ben@ctoforhire.com.au>
# License: GPLv3 <http://www.gnu.org/licenses/gpl-3.0.txt>
#
# Installation instructions:
#    wget https://gist.githubusercontent.com/bendechrai/8bbde547642404a4986c/raw/8049dcd7def5b2c96c28c7dd3b09933d2d5c9190/gnupg_backup -O ~/.gnupg/backup

if [ -z "$1" ]
then
	echo Usage: $0 /path/to/backup
	exit
fi

if [ ! -f gpg.conf -o ! -f pubring.gpg -o ! -f random_seed -o ! -f secring.gpg -o ! -f trustdb.gpg ]
then
	echo "Couldn't find these files in the current directory: gpg.conf, pubring.gpg, random_seed, secring.gpg, trustdb.gpg"
	exit
fi

# Get the current dir name, and move up a directory ready to take a backup
sourcedir="$(cd "$(dirname "$0")"; pwd -P)"
sourcedir="$(basename $sourcedir)"
cd ..

# Rebuild the destination directory to ensure its in an expected format
destdir="$(dirname $1)/$(basename $1)"

if [ ! -d $destdir ]
then
	echo $destdir is not a directory
	exit
fi

if [ ! -w $destdir ]
then
	echo $destdir is not writeable
	exit
fi

# Generate the filename once for multiple use
filename="$destdir/gnupg.$(date +%Y-%m-%d.%H-%M-%S).tbz2"

read -p "You're about to back up your public and secret GnuPG data from $sourcedir to $filename. Are you sure this destination is secure and uncompromised? (yN)" yn
case $yn in
	[Yy]* ) tar cjfv $filename $sourcedir; echo Backed up to $filename;;
        * ) echo "Aborted";;
esac

# Back in to the source directory
cd $sourcedir