# pro-archman
# lib/garbage.sh
# Functions for garbage collection
#
# Copyright (C) 2013  Patrick "P. J." McDermott
#
# 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/>.

[ "x${_GARBAGE_SM+set}" = 'xset' ] && return 0
_GARBAGE_SM=1

use locale
use output
use dir

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

	info_v "$(get_msg 'collecting_garbage')"

	# NB: The %s format conversion specifier is not specified by POSIX, but
	# it is supported by the GNU and BusyBox implementations of date.
	cur_time=$(date '+%s')

	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 <<-EOF
			${garbage}
			EOF
		rm -f "${garbage}"
	done
}

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

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

	# NB: The %s format conversion specifier is not specified by POSIX, but
	# it is supported by the GNU and BusyBox implementations of date.
	time=$(date '+%s')
	time=$(($time + $conf_pool_gc_delay))

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