#!/bin/bash

myver='2.3.2'

usage() {
  echo "gensync $myver"
  echo "usage: $0 <root> <destfile>"
	echo
	echo "gensync will generate a sync database by reading all PKGBUILD files"
	echo "from <root>.  gensync builds the database in /tmp/.gensync and then"
	echo "compresses it to <destfile>."
	echo
	echo "note: The <destfile> name is important.  It must be of the form"
	echo "      {treename}.db.tar.gz where {treename} is the name of the custom"
	echo "      package repository you configured in /etc/pacman.conf.  The"
	echo "      generated database must reside in the same directory as your"
	echo "      custom packages (also configured in /etc/pacman.conf)"
	echo
	echo "example:  gensync /usr/abs/local /home/mypkgs/custom.db.tar.gz"
	echo
  echo
  exit 0
}

db_write_entry()
{
	unset pkgname pkgver pkgrel
	unset depends conflicts
	source $1 || return 1
	cd /tmp/.gensync
	mkdir $pkgname-$pkgver-$pkgrel
	cd $pkgname-$pkgver-$pkgrel
	# desc
	echo "%NAME%" >desc
	echo "$pkgname" >>desc
	echo "" >>desc
	echo "%VERSION%" >>desc
	echo "$pkgver-$pkgrel" >>desc
	echo "" >>desc
	echo "%DESC%" >>desc
	echo "$pkgdesc" >>desc
	echo "" >>desc
	# depends
	echo "%DEPENDS%" >depends
	for depend in "${depends[@]}"; do
	  echo "$depend" >>depends
	done
	echo "" >>depends
	echo "%CONFLICTS%" >>depends
	for conflict in "${conflicts[@]}"; do
	  echo "$conflict" >>depends
	done
	echo "" >>depends
}

if [ $# -lt 2 ]; then
	usage
	exit 0
fi

if [ "$1" = "-h" -o "$1" = "--help" ]; then
	usage
	exit 0
fi

d=`dirname $1`
rootdir=`cd $d && pwd`
rootdir="$rootdir/`basename $1`"
d=`dirname $2`
destfile=`cd $d && pwd`
destfile="$destfile/`basename $2`"

rm -rf /tmp/.gensync || exit 1
mkdir -p /tmp/.gensync || exit 1

if [ ! -d $rootdir ]; then
	echo "gensync: invalid root dir: $rootdir" >&2
	rm -rf /tmp/.gensync
	exit 1
fi

echo "gensync: building database entries..." >&2
#for category in `find $rootdir/* -type d -maxdepth 0`; do
for file in `find $rootdir/* -name PKGBUILD`; do
	db_write_entry $file
	if [ $? -gt 0 ]; then
		echo "gensync: error writing entry for $file" >&2
		rm -rf /tmp/.gensync
		exit 1
	fi
done

echo "gensync: compressing to $destfile..." >&2
cd /tmp/.gensync
tar c * | gzip -9 >$destfile
if [ $? -gt 0 ]; then
	echo "gensync: error writing to $destfile" >&2
	rm -rf /tmp/.gensync
	exit 1
fi

rm -rf /tmp/.gensync

exit 0