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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"

CONFIG="/etc/${SOFTWARE}/config"
DEBCONF="/etc/${SOFTWARE}/debconf"

DEBCONF_NOWARNINGS="true"
export DEBCONF_NOWARNINGS

. /usr/share/debconf/confmodule

if [ -n "${PRESEED_FILE}" ]
then
	# user specified one or more preseed files through commandline option
	db_set container/preseed-file "${PRESEED_FILE}"
	db_fset container/preseed-file seen true
elif [ -e "${DEBCONF}/${NAME}.cfg" ]
then
	# user did not specify a pressed file, but there is a matching one
	# available on the system matching the container name
	db_set container/preseed-file "${DEBCONF}/${NAME}.cfg"
	db_fset container/preseed-file seen true
elif [ "$(ls ${DEBCONF}/*/${NAME}.cfg 2>/dev/null | wc -l)" -eq 1 ]
then
	# user did not specify a pressed file, but there is 1 (and only 1)
	# matching in a sub-directory of /etc/${SOFTWARE}/debconf

	FILE="$(ls ${DEBCONF}/*/${NAME}.cfg)"

	db_set container/preseed-file "${FILE}"
	db_fset container/preseed-file seen true
elif [ -e "${DEBCONF}/default.cfg" ]
then
	# user did not specify a pressed file, but there is a default one
	db_set container/preseed-file "${DEBCONF}/default.cfg"
	db_fset container/preseed-file seen true
elif ls "${DEBCONF}"/*.cfg > /dev/null 2>&1 || ls "${DEBCONF}"/*/*.cfg > /dev/null 2>&1
then
	# user has not specified preseed files through commandline option,
	# showing debconf selection dialog for global preseed file.

	FILES="$(cd ${DEBCONF} && find . -type f -name '*.cfg' -printf '%P\n' | LC_ALL=C sort)"
	PRESEED_FILES="$(for FILE in ${FILES}; do echo -n "$(echo ${FILE} | sed -e 's|.cfg$||'), "; done | sed -e 's|, $||')"

	if [ -n "${PRESEED_FILES}" ]
	then
		db_subst container/preseed-files CHOICES "custom, exit, none, , ${PRESEED_FILES}"

		db_settitle container/title
		db_input high container/preseed-files || true
		db_go

		db_get container/preseed-files
		PRESEED_FILE="${RET}" # select

		case "${PRESEED_FILE}" in
			custom|none)
				;;

			exit)
				rm -f "${CONFIG}/${NAME}.conf"
				exit 1
				;;

			*)
				# user specified preseed file through debconf select
				db_set container/preseed-file "${DEBCONF}/${PRESEED_FILE}.cfg"
				db_fset container/preseed-file seen true
				;;
		esac
	fi
fi

case "${PRESEED_FILE}" in
	none)
		;;

	*)
		# ask user for a preseed file
		db_settitle container/title
		db_input high container/preseed-file || true
		db_go

		db_get container/preseed-file
		PRESEED_FILE="${RET}" # string (w/ empty)

		echo "PRESEED_FILE=\"${PRESEED_FILE}\"" >> "${DEBCONF_TMPDIR}/debconf.default"
		export PRESEED_FILE
		;;
esac

db_stop