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

# Required parameters
channel="$(cat "${__object:?}/parameter/channel")"

# Boolean switches
persist=
if [ -f "${__object:?}"/parameter/persist ];
then
	persist=true
fi

learn=
if [ -f "${__object:?}"/parameter/learn ];
then
	learn=true
fi

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

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

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

# Install resulting configuration
__file "${confdir:?}"/kernel-"${__object_id:?}".conf \
	--mode 0640 --owner root --group bird \
	--source - << EOF
protocol kernel ${__object_id:?} {
$([ -n "${description?}" ] && printf "\tdescription \"%s\";\n" "${description?}")
$([ -n "${persist?}" ] && printf "\tpersist;\n")
$([ -n "${learn?}" ] && printf "\tlearn;\n")
	${channel:?} {
		import ${import:?};
		export ${_export:?};
	};
}
EOF