#!/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/>.
#

opt_format() {
	printf '%s %s\n' "${1:?'option name missing'}" "${2:?'option value missing'}"
}

opt_from_param() {
	# Only first line will be read.
	opt_format \
		"${1:?'option name missing'}" \
		"$(head -n 1 "${__object:?}/parameter/${2:?'parameter name missing'}")"
}


set -- --state "$(cat "${__object:?}/parameter/state")" --family inet

# Boolean flags
if test -f "${__object:?}/parameter/onboot"
then
	set -- "$@" --auto
fi
if test -f "${__object:?}/parameter/hotplug"
then
	set -- "$@" --hotplug
fi


if test -f "${__object:?}/parameter/name"
then
	set -- "$@" --name "$(cat "${__object:?}/parameter/name")"
fi


# Generate appropriate parameters based on bootproto
bootproto=$(cat "${__object:?}/parameter/bootproto")
case $bootproto
in
	(dhcp)
		set -- "$@" --method dhcp
		;;
	(static)
		set -- "$@" --method static

		if test -s "${__object:?}/parameter/address"
		then
			while read -r _value
			do
				set -- "$@" --option "$(opt_format address "${_value}")"
			done <"${__object:?}/parameter/address"
			unset _value
		fi

		if test -s "${__object:?}/parameter/gateway"
		then
			set -- "$@" --option "$(opt_from_param gateway gateway)"
		fi
		;;
	(manual)
		set -- "$@" --method manual
		;;
	(*)
		exit 1
		;;
esac

if test -s "${__object:?}/parameter/comment"
then
	set -- "$@" --comment "$(cat "${__object:?}/parameter/comment")"
fi

if test -s "${__object:?}/parameter/onchange"
then
	set -- "$@" --onchange "$(cat "${__object:?}/parameter/onchange")"
fi

if test -s "${__object:?}/parameter/extra-config"
then
	while read -r _opt
	do
		set -- "$@" --option "${_opt}"
	done <"${__object:?}/parameter/extra-config"
	unset _opt
fi

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