#!/bin/sh
# See LICENSE file for copyright and license details.

set -e

if ! test $# = 3; then
	printf 'usage: %s tarball-url ref-tarball work-dir\n' "$0" >&2
	exit 1
fi

utildir="$(dirname -- "$0")"
tarball="$3/download-$$.tar.gz"
refdir="$3/$$.refdir"
tmpdir="$3/$$.tmpdir"

rm -rf -- "${refdir}"
rm -rf -- "${tmpdir}"
mkdir -- "${refdir}"
mkdir -- "${tmpdir}"

curl -sL -- "$1" > "${tarball}"
gunzip < "${tarball}" | (cd -- "${tmpdir}" && tar -x)
gunzip < "$2" | (cd -- "${refdir}" && tar -x)
(cd -- "${refdir}"/*/ && find -print0) > "$3/listing-1"
(cd -- "${tmpdir}"/*/ && find -print0) > "$3/listing-2"

set +e
"${utildir}"/repodiff "${refdir}"/* "$3/listing-1" "${tmpdir}"/* "$3/listing-2"
ret=$?
set -e

rm -rf -- "${refdir}"
rm -rf -- "${tmpdir}"

if test $ret = 0; then
	"${utildir}"/get-checksums "${tarball}"
fi

rm -f -- "${tarball}"
exit $ret