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#!/bin/bash
# Copyright (C) 2014, 2017 Joseph Graham <joseph@xylon.me.uk>
# Copyright (C) 2018 Luke Shumaker <lukeshu@parabola.nu>
#
# 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 Affero 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/>.

# This script finds any updated packages and calls
# `make_indivudual_torrent' for each of them. Run every hour from cron.

# pacman doesn't support multiple different packages of the same name,
# so it's OK to just stuff all the torrents into a single directory.

set -eE
shopt -s extglob globstar nullglob
. "$(dirname "$(readlink -e "$0")")/../config"
. "$(dirname "$(readlink -e "$0")")/../torrent.conf"
. "$(librelib messages)"

mkdir -p -- "${FTP_BASE}/${TORRENTPOOL}"

IFS=, # for ${TRACKERS[*]} and ${WEBSEEDS[*]}

ret=0

make_torrent() {
	local pkgfile="$1"
	local target

	if [[ -f ${pkgfile}.torrent ]]; then
		return 0
	fi
	if ! [[ -f $pkgfile ]]; then
		die 'Is not a file: %s' "$pkgfile"
	fi

	if [[ -L "$pkgfile" ]]; then
		target=$(readlink -- "$pkgfile")
		make_torrent "${pkgfile%/*}/${target}"
		ln -sT -- "${target}.torrent" "${pkgfile}.torrent"
	else
		# Create the .torrent
		if [[ -f "${FTP_BASE}/${TORRENTPOOL}/${pkgfile##*/}.torrent" &&
		    ! -L "${FTP_BASE}/${TORRENTPOOL}/${pkgfile##*/}.torrent" ]]; then
			ln -T -- "${FTP_BASE}/${TORRENTPOOL}/${pkgfile##*/}.torrent" "${pkgfile}.torrent"
			ln -sfrT -- "${pkgfile}.torrent" "${FTP_BASE}/${TORRENTPOOL}/${pkgfile##*/}.torrent" || ret=$?
		else
			msg2 'Creating %s' "${pkgfile}.torrent"
			mktorrent \
				--announce="${TRACKERS[*]}" \
				--web-seed="${WEBSEEDS[*]/%/"${pkgfile#"${FTP_BASE}"}"}" \
				--output="${pkgfile}.torrent" \
				-- "${pkgfile}" >/dev/null
			ln -sfrT -- "${pkgfile}.torrent" "${FTP_BASE}/${TORRENTPOOL}/${pkgfile##*/}.torrent" || ret=$?
		fi
	fi
}

msg 'Creating .torrent files...'
for pkgfile in "$FTP_BASE"/*/os/*/*${PKGEXTS}; do
	make_torrent "$pkgfile"
done
msg 'Done'
exit $ret