#!/bin/sh

# container-tools - Manage systemd-nspawn containers
# Copyright (C) 2016-2017 David Kunz <david.kunz@open-infrastructure.net>
#
# 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 <http://www.gnu.org/licenses/>.

#set -e

CONFIG="/etc/container-tools/config"
MACHINES="/var/lib/machines"

echo -n "Creating new config files "

# FIXME: only touch config files of this system

for FILE in "${CONFIG}"/*.conf
do
	CONTAINER="$(basename ${FILE} .conf)"

	CNT_AUTO="$(awk -F= '/^cnt.auto=/ { print $2 }' ${FILE})"
	CNT_AUTO="${CNT_AUTO:-FIXME}"

	CNT_OVERLAY="$(awk -F= '/^cnt.overlay=/ { print $2 }' ${FILE})"

	BIND="$(awk -F= '/^bind=/ { print $2 }' ${FILE})"
	BIND="${BIND:-/srv/data/${CONTAINER}:/srv/${CONTAINER};}"

	BOOT="$(awk -F= '/^boot=/ { print $2 }' ${FILE})"
	BOOT="${BOOT:-no}"

	CAPABILITY="$(awk -F= '/^capability=/ { print $2 }' ${FILE})"
	DIRECTORY="${MACHINES}/${CONTAINER}"
	DROP_CAPABILITY="$(awk -F= '/^drop-capability=/ { print $2 }' ${FILE})"

	LINK_JOURNAL="$(awk -F= '/^link-journal=/ { print $2 }' ${FILE})"
	LINK_JOURNAL="${LINK_JOURNAL:-no}"

	MACHINE="${CONTAINER}"

	PRIVATE_USERS="$(awk -F= '/^private-users=/ { print $2 }' ${FILE})"
	PRIVATE_USERS="${PRIVATE_USERS:-no}"

	REGISTER="$(awk -F= '/^register=/ { print $2 }' ${FILE})"
	REGISTER="${REGISTER:-yes}"

	while read LINE
	do
		if echo ${LINE} | grep -qs '^cnt.network-bridge='
		then
			VETH="$(echo ${LINE} | awk -F: '{ print $1 }')"
			BRIDGE="$(echo ${LINE} | awk -F: '{ print $2 }')"

			IP="$(ip address show ${VETH} | awk '/inet / { print $2 }' | sed -e 's|/.*||')"
			CNT_NETWORK_BRIDGE="veth-$(echo ${IP} | awk -F. '{ print $3 }')-$(echo ${IP} | awk -F. '{ print $4 }'):${BRIDGE}"
		elif echo ${LINE} | grep -qs '^network-veth-extra='
		then
			VETH="$(echo ${LINE} | awk -F: '{ print $1 }')"
			ETH="$(echo ${LINE} | awk -F: '{ print $2 }')"

			IP="$(ip address show ${VETH} | awk '/inet / { print $2 }' | sed -e 's|/.*||')"
			NETWORK_VETH_EXTRA="veth-$(echo ${IP} | awk -F. '{ print $3 }')-$(echo ${IP} | awk -F. '{ print $4 }'):${ETH}"
		fi
	done < "${FILE}"

cat > ${FILE}-new << EOF
# container-tools: ${CONTAINER}

[start]
cnt.auto=${CNT_AUTO}
cnt.network-bridge=${CNT_NETWORK_BRIDGE}
cnt.overlay=${CNT_OVERLAY}
bind=${BIND}
boot=${BOOT}
capability=${CAPABILITY}
directory=${DIRECTORY}
drop-capability=${DROP_CAPABILITY}
link-journal=${LINK_JOURNAL}
machine=${MACHINE}
network-veth-extra=${NETWORK_VETH_EXTRA}
private-users=${PRIVATE_USERS}
register=${REGISTER}
EOF

	echo -n "."

done

echo " done."

for FILE in "${CONFIG}"/*.conf-new
do
	if [ ! -e "${CONFIG}/$(basename ${FILE} -new)" ]
	then
		continue
	fi

	clear

	echo "diff -Naurp ${CONFIG}/$(basename ${FILE} -new) ${FILE}"
	diff -Naurp "${CONFIG}/$(basename ${FILE} -new)" "${FILE}"

	echo
	echo -n "Accept $(basename ${FILE}) [y|N] "
	read ACCEPT

	case "${ACCEPT}" in
		y|Y)
			rm -f "${CONFIG}/$(basename ${FILE} -new)"
			mv "${FILE}" "${CONFIG}/$(basename ${FILE} -new)"
			;;
	esac
done