#!/bin/bash

# Copyright © 2009 Stefano Zacchiroli <zack@upsilon.cc>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

if [ -z "$1" ] ; then
    echo "Usage: sign-remote HOSTNAME:PATH"
    exit 2
fi
url="$1"
host=$(echo "$url" | cut -f 1 -d':')
path=$(echo "$url" | cut -f 2 -d':')
base=$(dirname "$path")
if [ -z "$host" -o -z "$path" ] ; then
    echo "Malformed remote \"URL\", must follow the \"HOSTNAME:PATH\" convention."
    exit 2
fi

tmp=`mktemp`
sig="$tmp.gpg"
trap "rm -f $tmp $sig" EXIT

echo "I: retrieving file to sign from remote host ..."
scp "$url" $tmp
echo "I: signing ..."
gpg --detach-sign --batch -o $sig $tmp
echo "I: sending back signature ..."
scp $sig "$host":"$path.gpg"
echo "I: remote signing done."