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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
. "$(dirname "$(readlink -e "$0")")/../config"
. "$(dirname "$(readlink -e "$0")")/../torrent.conf"
. "$(dirname "$(readlink -e "$0")")/../db-functions"

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

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

# Find any packages
for pkgfile in "$FTP_BASE"/*/os/*/*${PKGEXTS}; do
	# Resolve any symlinks
	pkgfile=$(readlink -f -- "$pkgfile")

	if ! [[ -f ${pkgfile##*/}.torrent ]]; then
		mktorrent \
			--announce="${TRACKERS[*]}" \
			--web-seed="${WEBSEED_MIRROR}${pkgfile#"${FTP_BASE}/"}" \
			-- "${pkgfile}" >/dev/null
	fi
done

# For torrents older than 1 year, we check if it's package still
# exists, else clean it up.  This shouldn't be done every hour.  So we
# do it with a 1-in-30 probability.
if ! (( $(shuf -e {0..29} | head -1) )); then
	while read -r torrent; do
		pkgfile="${torrent##*/}"
		pkgfile="${torrent%.torrent}"

		if ! is_globfile "$FTP_BASE"/*/os/*/"$pkgfile"; then
			rm -f -- "$torrent"
		fi
	done < <(find -H . -mtime +365 -name '*.torrent' -type f)
fi