#!/bin/bash

GPG=`which gpg`
TAR=`which tar`

if [ "$1" == "" ]; then
	echo "Please support a filename."
	exit 1
fi

FILENAME=$1
SIGFILE=""

if [ -f $FILENAME.gpg ]; then
	SIGFILE=${FILENAME}.gpg
fi
if [ -f $FILENAME.sig ]; then
	SIGFILE=${FILENAME}.sig
fi
if [ -f $FILENAME.asc ]; then
	SIGFILE=${FILENAME}.asc
fi

echo "Sigfile: '${SIGFILE}'"

if [ "${SIGFILE}" = "" ]; then
	echo "Please type the filename which contains the gpg signature:"
	read SIGFILE
	if [ ! -f $SIGFILE ]; then
		echo "File not found - giving up!"
		exit 1;
	fi
fi

echo "===== GPG Output Start ====="
${GPG} --verify ${SIGFILE} ${FILENAME} > /dev/null
RET=$?
echo "===== GPG Output End ====="
if [ ${RET} -eq 0 ]; then
	echo "Good signature! Extracting archive..."
	${TAR} -xzf $FILENAME
else
	echo "Bad signature! Aborting..."
	exit 1
fi