#!/bin/bash

# Copyright (C) 2010-2023 Pädagogisches Landesinstitut Rheinland-Pfalz
# Copyright (C) 2022-2023 Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
# Copyright (C) 2022-2023 Daniel Teichmann <daniel.teichmann@das-netzwerkteam.de>
#
# 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 2 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, write to the
# Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

# postrm script for debian-edu-router-config

set -e

. /usr/share/debconf/confmodule || exit 255

# prepare debconf
export DC_PRIO_LOW="medium"
export DC_PRIO_HIGH="high"


if [ -e /etc/debian-edu/router.conf ]; then
	source /etc/debian-edu/router.conf
fi
PRODUCTNAME="${PRODUCTNAME:-"Debian Edu Router"}"
db_title "$PRODUCTNAME"

# summary of how this script can be called:
#        * <postrm> `remove'
#        * <postrm> `purge'
#        * <old-postrm> `upgrade' <new-version>
#        * <new-postrm> `failed-upgrade' <old-version>
#        * <new-postrm> `abort-install'
#        * <new-postrm> `abort-install' <old-version>
#        * <new-postrm> `abort-upgrade' <old-version>
#        * <disappearer's-postrm> `disappear' <overwriter>
#          <overwriter-version>
# for details, see https://www.debian.org/doc/debian-policy/ or
# the debian-policy package

function unmask_dnsmasq_service() {
	deb-systemd-helper unmask dnsmasq
}

case "${1}" in
	'purge')
		db_input ${DC_PRIO_HIGH} debian-edu-router-config/purging-warn-remaining-config || true
		db_go

		# purge debconf-managed ifupdown config snippets
		rm -fv /etc/network/interfaces.d/??_d-e-r_*

		# purge debconf-managed uif config snippets
		rm -fv /etc/uif/uif.conf.d/??_d-e-r_*
		rm -fv /etc/uif/uif-ipv4-networks.inc.d/??_d-e-r_*
		rm -fv /etc/uif/uif-ipv6-networks.inc.d/??_d-e-r_*

		# purge mdns-reflector related config files
		rm -fv /etc/mdns-reflector/conf.d/??_d-e-r_*

		# purge ssh service related config files
		rm -fv /etc/ssh/sshd_config.d/??_d-e-r_*

		# if /etc/ssh/sshd_config does not exist we should assume that
		# openssh-server has never been installed (or purged again).
		# This might mean that it has been likely us who created
		# /etc/ssh/sshd_config.d/ (in our postinst script) and thus, we should
		# remove it again if empty.
		if [ ! -e "/etc/ssh/sshd_config" ] && [ -d "/etc/ssh/sshd_config.d" ]; then
			rmdir --ignore-fail-on-non-empty /etc/ssh/sshd_config.d/
			rmdir --ignore-fail-on-non-empty /etc/ssh/
		fi

		# purge debconf-managed sysctl config snippet
		rm -fv /etc/sysctl.d/30-debian-edu-router-config.conf

		# purge debconf-managed dnsmasq config snippets
		rm -fv /etc/dnsmasq.d/??_d-e-r_*

		# if /etc/dnsmasq.conf does not exist we should assume that
		# dnsmasq has never been installed (or purged again).
		# This might mean that it has been likely us who created
		# /etc/dnsmasq.d/ (in our postinst script) and thus, we should
		# remove it again if empty.
		if [ ! -e "/etc/dnsmasq.conf" ] && [ -d "/etc/dnsmasq.d" ]; then
			rmdir --ignore-fail-on-non-empty /etc/dnsmasq.d/
		fi

		unmask_dnsmasq_service

		rm -fv /etc/debian-edu-router/MANAGED_BY_DEBIAN_EDU_ROUTER
		rm -fv /etc/debian-edu-router/debug

		;;
	'remove'|'upgrade'|'failed-upgrade'|'abort-install'|'abort-upgrade'|'disappear')
		unmask_dnsmasq_service
		;;
	*)
		echo "postrm called with unknown argument '${1}'" >&2
		exit '1'
		;;
esac

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

# Automatically added by dh_installsystemd/13.24.2
if [ "$1" = remove ] && [ -d /run/systemd/system ] ; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installsystemd/13.24.2
if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge 'dnsmasq_d-e-r.target' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_installdebconf/13.24.2
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section


exit '0'