# pro-archman
# src/garbage.sh
# Functions for garbage collection
#
# Copyright (C) 2013  Patrick "P. J." McDermott
#
# This file is part of the ProteanOS Archive Manager.
#
# The ProteanOS Archive Manager 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.
#
# The ProteanOS Archive Manager 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 the ProteanOS Archive Manager.  If not, see
# <http://www.gnu.org/licenses/>.

time()
{
	# Based on code from <https://www.etalabs.net/sh_tricks.html> by Rich
	# Felker, with whitespace added for readability.
	printf '%d' $(($(TZ=UTC0 date "+
		(
			  (%Y - 1600) * 365
			+ (%Y - 1600) / 4
			- (%Y - 1600) / 100
			+ (%Y - 1600) / 400
			+ 1%j - 1000
			- 135140
		) * 86400
		+ (1%H - 100) * 3600
		+ (1%M - 100) * 60
		+ (1%S - 100)")))
}

collect_garbage()
{
	local cur_time=
	local garbage=
	local gar_time=
	local dirs=
	local file=

	info_v "$(get_msg 'collecting_garbage')"

	cur_time=$(time)

	for garbage in "${base_dir}/.db/garbage/"*; do
		if [ ! -f "${garbage}" ]; then
			continue
		fi
		gar_time=${garbage##*/}
		if [ ${cur_time} -lt ${gar_time} ]; then
			break
		fi
		while read -r dirs file; do
			info_v "$(get_msg 'collecting_garbage_file')" "${file}"
			rm -f "${base_dir}/${file}"
			while [ ${dirs} -gt 0 ]; do
				file="${file%/*}"
				try_rmdir "${base_dir}/${file}"
				dirs=$(($dirs - 1))
			done
		done <"${garbage}"
		rm -f "${garbage}"
	done

	return 0
}

mark_pool_garbage()
{
	local file="${1}"
	local time=

	info_v "$(get_msg 'marking_garbage_file')" "${file}"

	time=$(time)
	time=$(($time + $conf_pool_gc_delay))

	mkdir -p "${base_dir}/.db/garbage"
	printf '2 %s\n' "${file}" >>"${base_dir}/.db/garbage/${time}"

	return 0
}