#!/bin/sh
#
# Copyright (C) 2022 The Falco Authors.
#
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
set -e

DKMS_PACKAGE_NAME="@PACKAGE_NAME@"
DKMS_VERSION="@DRIVER_VERSION@"
NAME="@PACKAGE_NAME@"

postinst_found=0

case "$1" in
	configure)
		for DKMS_POSTINST in /usr/lib/dkms/common.postinst /usr/share/$DKMS_PACKAGE_NAME/postinst; do
			if [ -f $DKMS_POSTINST ]; then
				$DKMS_POSTINST $DKMS_PACKAGE_NAME $DKMS_VERSION /usr/share/$DKMS_PACKAGE_NAME "" $2
				postinst_found=1
				break
			fi
		done
		if [ "$postinst_found" -eq 0 ]; then
			echo "ERROR: DKMS version is too old and $DKMS_PACKAGE_NAME was not"
			echo "built with legacy DKMS support."
			echo "You must either rebuild $DKMS_PACKAGE_NAME with legacy postinst"
			echo "support or upgrade DKMS to a more current version."
			exit 1
		fi
	;;
esac

# Based off what debhelper dh_systemd_enable/13.3.4 would have added
# ref: https://www.debian.org/doc/manuals/debmake-doc/ch05.en.html#debhelper

if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
        # This will only remove masks created by d-s-h on package removal.
        deb-systemd-helper unmask 'falco.service' >/dev/null || true

        # was-enabled defaults to true, so new installations run enable.
        if deb-systemd-helper --quiet was-enabled 'falco.service'; then
                # Enables the unit on first installation, creates new
                # symlinks on upgrades if the unit file has changed.
                deb-systemd-helper enable 'falco.service' >/dev/null || true
        else
                # Update the statefile to add new symlinks (if any), which need to be
                # cleaned up on purge. Also remove old symlinks.
                deb-systemd-helper update-state 'falco.service' >/dev/null || true
        fi
fi

if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
        if [ -d /run/systemd/system ]; then
                systemctl --system daemon-reload >/dev/null || true
                if [ -n "$2" ]; then
                        _dh_action=restart
                else
                        _dh_action=start
                fi
                deb-systemd-invoke $_dh_action 'falco.service' >/dev/null || true
        fi
fi