#!/bin/bash
#
# Copyright (c) 2012, Ting-Wei Lan. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of the author nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR 
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

PKG_TREE="/tmp/lfspkgbuild"
PKG_STORE="/usr/pkg"

function parse_package_string () 
{

	package_name=`echo "$1" | sed -r 's/(.*)-([0-9\.]*)/\1/g'`
	package_version=`echo "$1" | sed -r 's/(.*)-([0-9\.]*)/\2/g'`
}

read -e -i "$PKG_TREE" -p "Temporarily installed package tree: " PKG_TREE
[ '!' -d "$PKG_TREE" ] && echo "$PKG_TREE is not a directory" && exit 1
read -e -i "$PKG_STORE" -p "Store package in: " PKG_STORE
[ '!' -d "$PKG_STORE" ] && echo "$PKG_STORE is not a directory" && exit 1

guess_name="$(basename "`pwd`")"
parse_package_string "$guess_name"
read -e -i "$package_name" -p "Package name: " package_name
read -e -i "$package_version" -p "Package version: " package_version

package_arch="`uname -m`"
[ "$package_arch" = "x86_64" ] && package_arch="amd64"
[ "$package_arch" = "i686" ] && package_arch="i386"
read -e -i "$package_arch" -p \
		 "Architecture (type \`all' for architecture-independent package): " \
		 package_arch

current_username="`id -nur`"
current_fullname="`getent passwd "$current_username" | cut -d ':' -f 5 | cut -d ',' -f 1`"
package_creator="$current_fullname <$current_username@`hostname`>"
read -e -i "$package_creator" -p "Maintainer: " package_creator

package_desc="$package_name"
read -e -i "$package_desc" -p "Description: " package_desc

mkdir -p "$PKG_TREE/DEBIAN"
rm -fv "$PKG_TREE/usr/share/info/dir"

echo "==> Creating MD5 sum"
pushd "$PKG_TREE" > /dev/null
md5sum `find . -type f | awk '/.\// { print substr($0, 3) }'` > "$PKG_TREE/DEBIAN/md5sums"
popd > /dev/null

echo "==> Creating control file"
controlfile="$PKG_TREE/DEBIAN/control"
exec 3> "$controlfile"
echo "Package: $package_name" 1>&3
echo "Version: $package_version" 1>&3
echo "Architecture: $package_arch" 1>&3
echo "Maintainer: $package_creator" 1>&3
echo "Description: $package_desc" 1>&3
exec 3>&-

echo "==> Creating DEB package"

dpkg-deb -b "$PKG_TREE" "$PKG_STORE"