#!/bin/bash
# Debian nodm package pre-removal script
#
# Based on gdm3.prerm:
# © 2001 Branden Robinson
#
# Licensed under the GNU General Public License, version 2.  See the file
# /usr/share/common-licenses/GPL-2 or <http://www.gnu.org/copyleft/gpl.txt>.
# Acknowlegements to Stephen Early, Mark Eichin, and Manoj Srivastava.

set -e

THIS_PACKAGE=nodm
DEFAULT_DISPLAY_MANAGER_FILE=/etc/X11/default-display-manager

if [ "$1" = "remove" -o "$1" = "deconfigure" ]; then
	if [ -e /usr/share/debconf/confmodule ]; then
		. /usr/share/debconf/confmodule
		# disown this question
		db_unregister shared/default-x-display-manager || true
		# does the question still exist?
		if db_get shared/default-x-display-manager; then
			db_metaget shared/default-x-display-manager owners
			db_subst shared/default-x-display-manager choices "$RET"
			db_get shared/default-x-display-manager
			# are we removing the currently selected display manager?
			if [ "$THIS_PACKAGE" = "$RET" ]; then
				if [ -e "$DEFAULT_DISPLAY_MANAGER_FILE" ]; then
					db_get "$RET"/daemon_name
					if [ "$(cat $DEFAULT_DISPLAY_MANAGER_FILE)" = "$RET" ]; then
						rm "$DEFAULT_DISPLAY_MANAGER_FILE"
					fi
				fi
				# ask the user to choose a new default
				db_fset shared/default-x-display-manager seen false
				db_input critical shared/default-x-display-manager || true
				db_go
				# if the display manager file doesn't exist, write it with the path
				# to the new default display manager
				if [ ! -e $DEFAULT_DISPLAY_MANAGER_FILE ]; then
					db_get shared/default-x-display-manager
					echo "Please be sure to run \"dpkg-reconfigure $RET\"."
					db_get "$RET"/daemon_name
					echo "$RET" > "$DEFAULT_DISPLAY_MANAGER_FILE"
				fi
			fi
		fi
	fi

	DEFAULT_SERVICE=/etc/systemd/system/display-manager.service
	# set default-display-manager systemd service link according to our config
	if [ -e "$DEFAULT_DISPLAY_MANAGER_FILE" ]; then
		SERVICE=/lib/systemd/system/$(basename $(cat "$DEFAULT_DISPLAY_MANAGER_FILE")).service
		if [ -h "$DEFAULT_SERVICE" ] && [ $(readlink "$DEFAULT_SERVICE") = /dev/null ]; then
			echo "Display manager service is masked" >&2
		elif [ -e "$SERVICE" ]; then
			ln -sf "$SERVICE" "$DEFAULT_SERVICE"
		else
			echo "WARNING: $SERVICE is the selected default display manager but does not exist" >&2
			rm -f "$DEFAULT_SERVICE"
		fi
	else
		rm -f "$DEFAULT_SERVICE"
	fi
fi

if [ "$1" = "remove" ]; then
	if [ -x /etc/init.d/nodm ]; then
		nostop=
		for hostname in "" "localhost" "$(hostname)" "$(hostname -f)"; do
			if echo $DISPLAY | grep -q "^$hostname:0.*"; then
				nostop=yes
			fi
		done
		if [ -z $nostop ]; then
			invoke-rc.d nodm stop
		fi
	fi
fi

# Automatically added by dh_installsystemd/13.3.4
if [ -d /run/systemd/system ] && [ "$1" = remove ]; then
	deb-systemd-invoke stop 'nodm.service' >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installinit/13.3.4
if [ -x "/etc/init.d/nodm" ] && [ "$1" = remove ]; then
	invoke-rc.d --skip-systemd-native nodm stop || exit 1
fi
# End automatically added section


exit 0