#!/bin/sh -e
# -*- mode: sh; indent-tabs-mode: t -*-
#
# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
#
# This file is part of cdist.
#
# cdist 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.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#

__package_apt bridge-utils
export require=__package_apt/bridge-utils

bridge_ports='none'  # space-separated list
bridge_stp='off'
enable_hotplug=no

cd "${__object:?}/parameter"
for param in *
do
	case ${param}
	in
		(bootproto)
			bootproto=$(cat "${__object:?}/parameter/bootproto")
			set -- "$@" --bootproto "${bootproto}"

			case ${bootproto}
			in
				(manual)
					# if set to manual, there is nothing to wait for…
					set -- "$@" --extra-config 'bridge_maxwait 0'
					;;
			esac
			;;
		(hotplug)
			# N.B.: This option must be equal for all configured bridges,
			#       or cdist will error.
			#       This is a limitation of the bridge-utils package.
			enable_hotplug=yes
			;;
		(port)
			bridge_ports=$(
				while read -r _port
				do
					test -z "$(echo "${_port}" | tr -d 'A-Za-z0-9')" || {
						printf 'Invalid bridge port name: %s\n' "${_port}" >&2
						exit 1
					}

					printf ' %s' "${_port}"
				done <"${__object:?}/parameter/port"
			)
			bridge_ports=${bridge_ports# }
			;;
		(stp)
			bridge_stp='on'
			;;
		(onboot)
			# boolean parameters
			set -- "$@" --"${param}"
			;;
		(*)
			set -- "$@" --"${param}" "$(cat "${__object:?}/parameter/${param}")"
			;;
	esac
done


# Set bridge ports
set -- "$@" --extra-config "bridge_ports ${bridge_ports}"

# Set boolean options
set -- "$@" --extra-config "bridge_stp ${bridge_stp}"
test "${bridge_stp}" = 'on' || set -- "$@" --extra-config 'bridge_fd 0'

__key_value /etc/default/bridge-utils:BRIDGE_HOTPLUG --state present \
	--file /etc/default/bridge-utils --key BRIDGE_HOTPLUG \
	--delimiter = --exact_delimiter \
	--value "${enable_hotplug}"


# Instantiate backend type
if test -s "${__object:?}/stdin"
then
	exec <"${__object:?}/stdin"
fi
__interface "${__object_id:?}" --type ifupdown.d "$@"