#!/bin/bash
# Releases 'any' packages from Arch arches to our arches

set -eu -o pipefail
source "$(dirname "$(readlink -e "$0")")/config"
source "$(dirname "$(readlink -e "$0")")/db-import-any.conf"
source "$(librelib messages)"
setup_traps

# usage: expac_file <file.db> <expac_args>
#
# Uses the ${WORKDIR} global
expac_file() {
	local dbfile=$1
	local args=("${@:2}")

	local reponame=${dbfile##*/}
	reponame=${reponame%%.*}

	mkdir -p -- "${WORKDIR}/expac/root"
	cat >"${WORKDIR}/expac/pacman.conf" <<-EOT
	[options]
	RootDir = ${WORKDIR}/expac/root
	DBPath = ${WORKDIR}/expac/root

	[${reponame}]
	Server = file://$(realpath --no-symlinks -- "${dbfile%/*}")
	EOT

	fakeroot pacman --config="${WORKDIR}/expac/pacman.conf" -Syy >/dev/null
	# expac exits with non-zero on emtpy databases, so ignore errors
	expac --config="${WORKDIR}/expac/pacman.conf" --sync "${args[@]}" || true
}

db_list_any_pkgfiles() {
	local dbfile="$1"
	expac_file "$dbfile" '%a %f' | awk '$1 == "any" { print $2 }'
}

main() {
	WORKDIR=$(mktemp -dt "${0##*/}.XXXXXXXXXX")
	readonly WORKDIR
	trap "rm -rf -- ${WORKDIR@Q}" EXIT

	local repo arch
	for repo in "${PKGREPOS[@]}"; do
		msg "Processing %s..." "${repo}"
		mkdir -p -- "${WORKDIR}/staging/${repo}"
		# Look for arch=(any) packages that exist in
		# ${BASEARCH} for this repo but is missing from one or
		# more of ${ARCHES[@]}.
		db_list_any_pkgfiles "${FTP_BASE}/${repo}/os/${BASEARCH}/${repo}.db" | sort -u > "${WORKDIR}/base.txt"
		for arch in "${ARCHES[@]}"; do
			[[ $arch != "$BASEARCH" ]] || continue
			db_list_any_pkgfiles "${FTP_BASE}/${repo}/os/${arch}/${repo}.db" | sort -u > "${WORKDIR}/arch.txt"
			comm -23 "${WORKDIR}/base.txt" "${WORKDIR}/arch.txt"
		done \
			| sort -u \
			| xargs -d '\n' -r -n1 -- printf '%s/%s\n' "${FTP_BASE}/${repo}/os/${BASEARCH}" \
			| sed 's/.*/&\n&.sig/' \
			| xargs -d '\n' -r -- ln -srv -t "${WORKDIR}/staging/${repo}" --
	done

	msg "Running db-update..."
	STAGING=${WORKDIR}/staging db-update
}

main "$@"