lib/index.sh: New file.

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+# 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="${archive}/feeds/${chan}/${dist}/${plat}/${arch}/${sect}"
+	feed_hash_idx="${feed_hash_idx}/.db/${pkg_hash}"
+	mkdir -p "${feed_hash_idx}"
+	tar -xzOf "${archive}/${file}" 'control.tar.gz' | tar -xzO './control' \
+		>"${feed_hash_idx}/info/${pkg}.control"
+	printf 'Filename: %s\nSize: %s\nMD5sum: %s\n\n' \
+		"../../../../../../${file}" "${size}" \
+		"$(md5sum "${archive}/${file}" | sed 's/ .*$//')" \
+		>>"${feed_hash_idx}/info/${pkg}.control"
+
+	# Mark feed index fragment as outdated.
+	old_dir="${archive}/feeds/.db/${chan}_${dist}/${plat}_${arch}/${sect}"
+	mkdir -p "${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="${archive}/feeds/${chan}/${dist}/${plat}/${arch}/${sect}"
+	feed_hash_idx="${feed_hash_idx}/.db/${pkg_hash}"
+	rm -f "${feed_hash_idx}/info/${pkg}.control"
+	try_rmdir "${feed_hash_idx}/info"
+
+	# Mark feed index fragment as outdated.
+	old_dir="${archive}/feeds/.db/${chan}_${dist}/${plat}_${arch}/${sect}"
+	mkdir -p "${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}|${archive}/feeds/"'\1/\2/\3/\4/\5|'
+
+	# For each suite:
+	for suite_dirent in "${archive}/feeds/.db/"*_*/; do
+		# For each archplat:
+		for archplat_dirent in "${suite_dirent}/"*_*/; do
+			# For each section:
+			for sect_direct in "${archplat_dirent}/"*/; do
+				# 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
+					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
+}