#!/bin/sh -e
#
# 2021 Joachim Desroches (joachim.desroches@epfl.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/>.
#


os=$(cat "${__global:?}/explorer/os")

case "$os" in
'alpine'|'debian'|'ubuntu')
	confdir='/etc/bird.d'
;;
*)
	printf "Your operating system (%s) is currently not supported by this __bird_ospf\n" "$os" >&2
	printf "Please contribute an implementation for it if you can.\n" >&2
	exit 1
;;
esac

description=
if [ -f "${__object:?}/parameter/description" ];
then
	description="$(cat "${__object:?}/parameter/description")"
fi

instance_id=
if [ -f "${__object:?}/parameter/instance-id" ];
then
	instance_id="$(cat "${__object:?}/parameter/instance-id")"
fi

extra_area_configuration=
if [ -f "${__object:?}/parameter/extra-area-configuration" ];
then
	extra_area_configuration="$(cat "${__object:?}/parameter/extra-area-configuration")"

	if [ "$extra_area_configuration" = "-" ]; then
		extra_area_configuration=$(cat "$__object/stdin")
	fi
fi

if [ ! -f "${__object:?}/parameter/interface" ] && [ -z "$extra_area_configuration" ]; then
	echo "Either --interface or --extra-area-configuration must be set." >&2
	exit 1
fi

__file "${confdir:?}/ospf-${__object_id:?}.conf" \
	--mode 0640 --owner root --group bird \
	--source - << EOF
protocol ospf v3 ${__object_id:?} {
$([ -n "${description?}" ] && printf "\tdescription \"%s\";\n" "${description?}")
$([ -n "${instance_id?}" ] && printf "\tinstance id %s;\n" "${instance_id?}")

	$(cat "${__object:?}/parameter/channel") {
		import $(cat "${__object:?}/parameter/import");
		export $(cat "${__object:?}/parameter/export");
	};

	area 0 {
$(sed -e 's/^/\t\tinterface "/' -e 's/$/";/' "${__object:?}/parameter/interface")
$(sed -e 's/^/\t\tsubnet /' -e 's/$/;/' "${__object:?}/parameter/subnet")

		$extra_area_configuration
	};
}
EOF