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#!/bin/sh
#
# Copyright (C) 2021 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
#
# 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.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e

usage()
{
	echo "$0 <tag> <output directory> [-j N] [-T N]"
	echo "  -j N        use at most N download jobs to run in parallel;"
	echo "              the default is 4;"
	echo "  -T N        use at most N threads to compress the tarball;"
	echo "              the default is 1; set to 0 to use as many threads"
	echo "              as there are processor cores"

	exit 1
}

jobs=4
threads=1

get_option()
{
	option="$1"
	value="$2"

	if [ "${option}" = "-T" ] ; then
		threads="${value}"
	elif [ "${option}" = "-j" ] ; then
		jobs="${value}"
	else
		usage
	fi
}

if [ $# -ne 2 -a $# -ne 4 -a $# -ne 6 ] ; then
	usage
elif [ $# -eq 4 ] ; then
	get_option "$3" "$4"
elif [ $# -eq 6 ] ; then
	if [ "$3" = "$5" ] ; then
		usage
	fi
	get_option "$3" "$4"
	get_option "$5" "$6"
fi

tag="$1"
outdir="$2"

replicant_dir="${outdir}/${tag}"
repo_branch="refs/tags/${tag}"

version="$(echo ${tag} | sed 's/replicant-//')"
major_version="$(echo ${version} | sed 's/-.*//')"
minor_version="$(echo ${version} | sed 's/.*-//')"

mkdir -p "${replicant_dir}"
cd "${replicant_dir}"
if [ ! -d .repo ] ; then
	yes | repo init \
		-u https://git.replicant.us/replicant/manifest.git \
		-b "${repo_branch}" \
		--depth=1 || rm -rf .repo/
fi

# We have an issue with all the Replicant releases before Replicant 6.0-0001:
# All the manifests use git://, however over the time we moved several git
# repositories and wrote some apache redirect rules to handle that.
# Due to that, only http:// and https:// work fine.
# This should be fixed in all the replicant-<version>-dev branches, however
# we cannot use that here as we are making tarballs of former releases.
if [ $(echo ${major_version} | sed 's/\..*//') -lt 6 ] ; then
	sed 's#git://#https://#g' -i \
	    .repo/manifests/default.xml
fi

repo sync -j "${jobs}"

# We want the exact same source code used to build the images, so we need to
# remove all the modifications we did to enable fetching the source code
if [ $(echo $major_version | sed 's/\..*//') -lt 6 ] ; then
	git -C .repo/manifests reset --hard
fi

cd ..
tarball="${tag}.tar"
if [ ! -f "${tarball}" ] && [ ! -f "${tarball}.xz" ] ; then
	tar cf "${tarball}" "${replicant_dir}"	|| rm -f "${tarball}"
fi

# TODO: Make the tarball reproducible by removing metadata

xz -T "${threads}" -9e --verbose "${tarball}"