# pro-archman
# lib/index.sh
# Functions for working with package feed indices
#
# 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/>.

use dir

feed_add_package()
{
	local chan="${1}"
	local dist="${2}"
	local plat="${3}"
	local arch="${4}"
	local sect="${5}"
	local pkg="${6}"
	local size="${7}"
	local file="${8}"
	local pkg_hash=
	local feed_hash_idx=
	local old_dir=

	pkg_hash="$(hash_name "${pkg}")"

	# Add package metadata to feed hash index.
	feed_hash_idx="${opt_base_dir}/feeds/${chan}/${dist}/${plat}/${arch}"
	feed_hash_idx="${feed_hash_idx}/${sect}/.db/${pkg_hash}"
	mkdir -p "${feed_hash_idx}"
	tar -xzOf "${opt_base_dir}/${file}" 'control.tar.gz' | \
		tar -xzO './control' >"${feed_hash_idx}/info/${pkg}.control"
	printf 'Filename: %s\nSize: %s\nMD5sum: %s\n\n' \
		"../../../../../../${file}" "${size}" \
		"$(md5sum "${opt_base_dir}/${file}" | sed 's/ .*$//')" \
		>>"${feed_hash_idx}/info/${pkg}.control"

	# Mark feed index fragment as outdated.
	old_dir="${opt_base_dir}/feeds/.db/${chan}_${dist}/${plat}_${arch}"
	old_dir="${old_dir}/${sect}"
	mkdir -p "${old_dir}"
	>"${old_dir}/${pkg_hash}"

	return 0
}

feed_remove_package()
{
	local chan="${1}"
	local dist="${2}"
	local plat="${3}"
	local arch="${4}"
	local sect="${5}"
	local pkg="${6}"
	local pkg_hash=
	local feed_hash_idx=
	local old_dir=

	pkg_hash="$(hash_name "${pkg}")"

	# Remove package metadata from feed hash index.
	feed_hash_idx="${opt_base_dir}/feeds/${chan}/${dist}/${plat}/${arch}"
	feed_hash_idx="${feed_hash_idx}/${sect}/.db/${pkg_hash}"
	rm -f "${feed_hash_idx}/info/${pkg}.control"
	try_rmdir "${feed_hash_idx}/info"

	# Mark feed index fragment as outdated.
	old_dir="${opt_base_dir}/feeds/.db/${chan}_${dist}/${plat}_${arch}"
	old_dir="${old_dir}/${sect}"
	mkdir -p "${old_dir}"
	>"${old_dir}/${pkg_hash}"

	return 0
}

update_feeds()
{
	local script=
	local suite_dirent=
	local archplat_dirent=
	local sect_dirent=
	local feed=
	local hash_dirent=
	local idx=

	script='s|^.*//*\(..*\)_\(..*\)//*\(..*\)_\(..*\)//*\(..*\)/$'
	script="${script}|${opt_base_dir}/feeds/"'\1/\2/\3/\4/\5|'

	# For each suite:
	for suite_dirent in "${opt_base_dir}/feeds/.db/"*_*/; do
		if [ ! -d "${suite_dirent}" ]; then
			continue
		fi
		# For each archplat:
		for archplat_dirent in "${suite_dirent}/"*_*/; do
			if [ ! -d "${archplat_dirent}" ]; then
				continue
			fi
			# For each section:
			for sect_direct in "${archplat_dirent}/"*/; do
				if [ ! -d "${sect_dirent}" ]; then
					continue
				fi
				# Get the feed path from the index path.
				feed="$(printf '%s\n' "${sect_dirent}" | \
					sed "${script}")"
				# For each package name hash:
				for hash_dirent in "${sect_dirent}/"*; do
					if [ ! -d "${hash_dirent}" ]; then
						continue
					fi
					idx="${feed}/.db/${hash_dirent##*/}"
					# Ensure there are still packages here.
					if [ -d "${idx}/info" ]; then
						cat "${idx}/info/"*.control \
							>"${idx}/Packages"
					else
						rm -f "${idx}/Packages"
					fi
					rm -f "${hash_dirent}"
				done
				# Ensure there are still packages here.
				if ! try_rmdir "${feed}/.db"; then
					cat "${feed}/.db/"*/Packages \
						>"${feed}/Packages~"
					mv "${feed}/Packages~" \
						"${feed}/Packages"
				else
					>"${feed}/Packages"
				fi
				rmdir "${sect_dirent}"
			done
			rmdir "${archplat_dirent}"
		done
		rmdir "${suite_dirent}"
	done

	return 0
}