#!/bin/sh
#
# This script takes a directory containing the base install of X, a directory
# containing the packing lists for the tarballs, and generates the distribution
# tarballs in a 3rd destination directory.

# generate_tarball <packing list> <tarball>
#
# Takes the packing list listed in the first argument and generates a
# corresponding tarball relative to the source directory in a file with the
# name listed in the second argument.
generate_tarball() {
	echo "Generating $2 from $1..."

	tar_arguments='cnTfp';

	# handle gzip/bzip2/compress
	case $2 in
		*gz)
			tar_arguments="${tar_arguments}z"
			;;
		*bz)
			tar_arguments="${tar_arguments}y"
			;;
		*Z)
			tar_arguments="${tar_arguments}Z"
			;;
	esac

	cat $1 | (cd  ${source_dir} ; tar ${tar_arguments} - - ) > $2
}

# output the usage
#
usage() {
	echo "$0 <source_dir> <plist_dir> <tarball_dir>"
	echo
	echo "Where <source_dir> is a directory containing the X distribution,"
	echo "<plist_dir> is the directory containing all of the packing lists"
	echo "generated by generate_plists.sh, and <tarball_dir> is the"
	echo "directory to put all the tarballs under."
	exit 1
}

# copy the directory structure of the packing list directory over into the
# tarball directory
#
mirror_directories() {
	echo "Creating tarball directory structure..."
	find ${plist_dir} -type d | \
		sed -e "s:^${plist_dir}:mkdir -p ${tarball_dir}:" | \
		sh -x || exit 1
}

# build all the tarballs
#
build_tarballs() {
	for plist in `find ${plist_dir} ! -type d`; do
		archive=`echo ${plist} | \
			sed -e "s:^${plist_dir}:${tarball_dir}:" \
			    -e 's/\.plist$//'`
		generate_tarball ${plist} ${archive}
	done
}

# check for enough arguments
if [ $# -ne 3 ]; then
	usage
fi

# setup the variables
source_dir=$1
plist_dir=$2
tarball_dir=$3

# do all the work
if mirror_directories; then
	build_tarballs
fi