#!/bin/sh

# container-tools - Manage systemd-nspawn containers
# Copyright (C) 2014-2017 Daniel Baumann <daniel.baumann@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

if [ -e "${DEBCONF_TMPDIR}/debconf.default" ]
then
	. "${DEBCONF_TMPDIR}/debconf.default"
fi

if [ -z "${PRESEED_FILE}" ]
then
	# user has not specified or selected any preseed files
	exit 0
fi

# user has one or more preseed file specified through commandline option
# or debconf selection dialog.
PRESEED_FILES="$(echo ${PRESEED_FILE} | sed -e 's|,| |g')"

DEBCONF_PRESEED_FILES=""

for PRESEED_FILE in ${PRESEED_FILES}
do
	if [ ! -e "${PRESEED_FILE}" ]
	then
		# preseed file does not exist
		echo "W: ${PRESEED_FILE}: No such file."

		continue
	fi

	# add preseed file to debconf
	DEBCONF_PRESEED_FILES="${DEBCONF_PRESEED_FILES} ${PRESEED_FILE}"

	if ! grep -qs '^ *container-tools *cnt-debconf/include-preseed-files' "${PRESEED_FILE}"
	then
		# preseed file has no includes
		continue
	fi

	# preseed file has includes
	INCLUDE_PRESEED_FILES="$(grep '^ *container-tools *cnt-debconf/include-preseed-files' ${PRESEED_FILE} | awk '{ $1=$2=$3=""; print $0 }' | sed -e 's|,| |g')"

	# FIXME: we're supporting only *ONE* include layer for now, so no nested/recursive includes just yet
	for FILE in ${INCLUDE_PRESEED_FILES}
	do
		if [ -e "${FILE}" ]
		then
			DEBCONF_PRESEED_FILES="${FILE} ${DEBCONF_PRESEED_FILES}"
		else
			# included preseed file does not exist
			echo "W: ${INCLUDE_PRESEED_FILE}: No such file - included from ${PRESEED_FILE}"
		fi
	done
done

for DEBCONF_PRESEED_FILE in ${DEBCONF_PRESEED_FILES}
do
	if [ -e /usr/bin/kdig ]
	then
		DIG="/usr/bin/kdig"
	elif [ -e /usr/bin/dig ]
	then
		DIG="/usr/bin/dig"
	fi

	if [ -n "${DIG}" ]
	then
		IPV4_ADDRESS="$(${DIG} +short ${NAME} | tail -n1)"
	fi

	sed -e "s|@NAME@|${NAME}|g" \
	    -e "s|@IPV4_ADDRESS@|${IPV4_ADDRESS}|g" \
	"${DEBCONF_PRESEED_FILE}" > "${DIRECTORY}/preseed.cfg"

	# Apply user specified preseed files
	debconf-set-selections "${DIRECTORY}/preseed.cfg"

	rm -f "${DIRECTORY}/preseed.cfg"
done

# Write expanded list of debconf preseed files
echo "PRESEED_FILE=\"${DEBCONF_PRESEED_FILES}\"" >> "${DEBCONF_TMPDIR}/debconf.default"