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#!/bin/sh


# Copyright (C) 2014-2021 Daniel Baumann <daniel.baumann@open-infrastructure.net>
#
# SPDX-License-Identifier: GPL-3.0+
#
# This program 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.
#
# This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.

set -e

PROJECT="open-infrastructure"
SOFTWARE="compute-tools"
PROGRAM="container"
COMMAND="$(basename ${0})"

CONFIG="/etc/${SOFTWARE}/config"
HOOKS="/etc/${SOFTWARE}/hooks"
MACHINES="/var/lib/machines"
SCRIPTS="/usr/share/${SOFTWARE}/scripts"

Parameters ()
{
	GETOPT_LONGOPTIONS="name:,cnt.container-server:,id:,script:,shortname:,config-template:,verbose,"
	GETOPT_OPTIONS="n:,i:,s:,c:,v,"

	PARAMETERS="$(getopt --longoptions ${GETOPT_LONGOPTIONS} --name=${COMMAND} --options ${GETOPT_OPTIONS} --shell sh -- ${@})"

	if [ "${?}" != "0" ]
	then
		echo "'${COMMAND}': getopt exit" >&2
		exit 1
	fi

	eval set -- "${PARAMETERS}"

	while true
	do
		case "${1}" in
			-n|--name)
				NAME="${2}"
				shift 2
				;;

			--cnt.container-server)
				CNT_CONTAINER_SERVER="${2}"
				shift 2
				;;

			-i|--id)
				ID="${2}"
				shift 2
				;;

			-s|--script)
				SCRIPT="${2}"
				shift 2
				;;

			--shortname)
				SHORTNAME="${2}"
				shift 2
				;;

			-t|--config-template)
				CONFIG_TEMPLATE="${2}"
				shift 2
				;;

			-v|--verbose)
				VERBOSE="true"
				shift 1
				;;

			--)
				shift 1
				break
				;;

			*)
				echo "'${COMMAND}': getopt error" >&2
				exit 1
				;;
		esac
	done
}

Usage ()
{
	# FIXME
	echo WIP
	echo "Usage: ${PROGRAM} ${COMMAND} -n|--name NAME [--cnt.container-server=true|false|FQDN] [--cnt.overlay=DIRECTORY_LOWER:DIRECTORY_UPPER:DIRECTORY_WORK:DIRECTORY_MERGED] [--cnt.overlay-options=OPTION[,OPTION]] [-b|--bind DIRECTORY:DIRECTORY[:OPTIONS]] [--bind-ro DIRECTORY:DIRECTORY[:OPTIONS]] [-c|--capability CAPABILITY[,CAPABILITY]] [-d|--drop-capability DROP_CAPABILITY[,DROP_CAPABILITY]] [-s|--script SCRIPT] [-v|--verbose] [-- SCRIPT_OPTIONS]" >&2
	exit 1
}

Parameters "${@}"

if [ -z "${NAME}" ]
then
	Usage
fi

if [ -z "${ID}" ]
then
	Usage
fi

case "${NAME}" in
	ALL)
		echo "'${NAME}': name 'ALL' is reserved to expand to all available container" >&2
		exit 1
		;;
esac

if [ -e "${CONFIG}/${NAME}.conf" ]
then
	echo "'${NAME}': container already exists or ${CONFIG}/${NAME}.conf has not been removed" >&2
	exit 1
fi

if [ -z "${SCRIPT}" ]
then
	if [ -e "${SCRIPTS}/default" ]
	then
		TARGET="$(basename $(readlink ${SCRIPTS}/default))"

		case "${TARGET}" in
			container_script)
				TARGET="$(basename $(readlink /etc/alternatives/container_script))"
				;;
		esac

		if [ -e "${SCRIPTS}/${TARGET}" ]
		then
			SCRIPT="${TARGET}"
		else
			echo "default -> '${TARGET}': no such script" >&2
			exit 1
		fi
	else
		SCRIPT="debian"
	fi
else
	if [ ! -e "${SCRIPTS}/${SCRIPT}" ]
	then
		echo "'${SCRIPT}': no such script" >&2
		exit 1
	fi
fi

case "${CONFIG_TEMPLATE}" in
	'')
		CONFIG_TEMPLATE="/usr/share/${SOFTWARE}/config/container.conf.in"
		;;
esac

case "${VERBOSE}" in
	true)

cat << EOF
################################################################################
Creating container: ${NAME}
################################################################################
EOF

	;;
esac

BASE_PORT="20000"

CNT_CONTAINER_SERVER="${CNT_CONTAINER_SERVER:-$(hostname -f 2> /dev/null || hostname)}"
PORT="$((${BASE_PORT}+${ID}))"

# config
mkdir -p "${CONFIG}"

sed	-e "s|@CNT_AUTO@|${CNT_AUTO}|g" \
	-e "s|@CNT_CONTAINER_SERVER@|${CNT_CONTAINER_SERVER}|g" \
	-e "s|@CNT_NETWORK_BRIDGE@|${CNT_NETWORK_BRIDGE}|g" \
	-e "s|@CNT_OVERLAY@|${CNT_OVERLAY}|g" \
	-e "s|@CNT_OVERLAY_OPTIONS@|${CNT_OVERLAY_OPTIONS}|g" \
	-e "s|@NAME@|${NAME}|g" \
	-e "s|@BIND@|${BIND}|g" \
	-e "s|@BIND_RO@|${BIND_RO}|g" \
	-e "s|@BOOT@|yes|g" \
	-e "s|@CAPABILITY@|${CAPABILITY}|g" \
	-e "s|@DIRECTORY@|${MACHINES}/${NAME}|g" \
	-e "s|@DROP_CAPABILITY@|${DROP_CAPABILITY}|g" \
	-e "s|@LINK_JOURNAL@|no|g" \
	-e "s|@MACHINE@|${NAME}|g" \
	-e "s|@NETWORK_VETH_EXTRA@|${NETWORK_VETH_EXTRA}|g" \
	-e "s|@PRIVATE_USERS@|no|g" \
	-e "s|@REGISTER@|yes|g" \
	-e "s|@ID@|${ID}|g" \
	-e "s|@SHORTNAME@|${SHORTNAME}|g" \
	-e "s|@PORT@|${PORT}|g" \
"${CONFIG_TEMPLATE}" > "${CONFIG}/${NAME}.conf"

# Run
"${SCRIPTS}/${SCRIPT}" $(echo "${@}" | sed -e 's| -- | |')

# done
echo "'${NAME}': container created."