#!/sbin/openrc-run
# Copyright 1999-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License, v2

retry="TERM/5/TERM/5"

# This is here to serve as a note to myself, and future developers.
#
# Any Display manager (gdm,kdm,xdm) has the following problem:  if
# it is started before any getty, and no vt is specified, it will
# usually run on vt2.  When the getty on vt2 then starts, and the
# DM is already started, the getty will take control of the keyboard,
# leaving us with a "dead" keyboard.
#
# Resolution: add the following line to /etc/inittab
#
#  x:a:once:/usr/bin/startDM
#
# and have /usr/bin/startDM start the DM in daemon mode if
# a lock is present (with the info of what DM should be started),
# else just fall through.
#
# How this basically works, is the "a" runlevel is a additional
# runlevel that you can use to fork processes with init, but the
# runlevel never gets changed to this runlevel. Along with the "a"
# runlevel, the "once" key word means that startDM will only be
# run when we specify it to run, thus eliminating respawning
# startDM when "display-manager" is not added to the default 
# runlevel, as was done previously.
#
# This script then just calls "telinit a", and init will run
# /usr/bin/startDM after the current runlevel completes (this
# script should only be added to the actual runlevel the user is
# using).
#
# Martin Schlemmer
# aka Azarah
# 04 March 2002

depend() {
	need localmount display-manager-setup

	# this should start as early as possible
	# we can't do 'before *' as that breaks it
	# (#139824) Start after ypbind and autofs for network authentication
	# (#145219 #180163) Could use lirc mouse as input device
	# (#70689 comment #92) Start after consolefont to avoid display corruption
	# (#291269) Start after quota, since some dm need readable home
	# (#390609) gdm-3 will fail when dbus is not running
	# (#366753) starting keymaps after X causes problems
	# (#768834) race condition with elogind
	after bootmisc consolefont modules netmount
	after readahead-list ypbind autofs openvpn gpm lircmd
	after quota keymaps
	after elogind
	after sssd
	before alsasound

	# Start before GUI
	use dbus xfs
}

setup_dm() {
	local MY_XDM

	MY_XDM=$(echo "${DISPLAYMANAGER}" | tr '[:upper:]' '[:lower:]')
	case "${MY_XDM}" in
		kdm|kde)
			command=/usr/bin/kdm
			pidfile=/run/kdm.pid
			;;
		entrance*)
			command=/usr/sbin/entrance
			pidfile=/run/entrance.pid
			;;
		gdm|gnome)
			# gdm-3 and above has different paths
			if [ -f /usr/sbin/gdm ]; then
				command=/usr/sbin/gdm
				pidfile=/run/gdm/gdm.pid
				start_stop_daemon_args="--background"
			else
				command=/usr/bin/gdm
				pidfile=/run/gdm.pid
			fi
			[ "${RC_UNAME}" != "Linux" ] && name=gdm-binary
			;;
		greetd)
			command=/usr/bin/greetd
			command_background=yes
			pidfile=/run/greetd.pid
			;;
		wdm)
			command=/usr/bin/wdm
			;;
		gpe)
			command=/usr/bin/gpe-dm
			pidfile=/run/gpe-dm.pid
			;;
		lxdm)
			command=/usr/sbin/lxdm-binary
			pidfile=/run/lxdm.pid
			start_stop_daemon_args="--background"
			;;
		lightdm)
			command=/usr/sbin/lightdm
			pidfile=/run/lightdm.pid
			start_stop_daemon_args="--background"
			;;
		sddm)
			command="/usr/bin/sddm"
			command_background=yes
			pidfile=/run/sddm.pid
			;;
		*)
			# first find out if there is such executable
			command="$(command -v ${MY_XDM} 2>/dev/null)"
			pidfile="/run/${MY_XDM}.pid"

			# warn user that they are doing sick things if the exe was not found
			if [ -z "${command}" ]; then
				eerror "ERROR: Your XDM value is invalid."
				eerror "  No ${MY_XDM} executable could be found on your system."
			fi
			;;
	esac

	if ! [ -x "${command}" ]; then
		command=/usr/bin/xdm
		pidfile=/run/xdm.pid
		if ! [ -x "/usr/bin/xdm" ]; then
			eerror "ERROR: Please set your DISPLAYMANAGER variable in /etc/conf.d/display-manager,"
			eerror "        or install the x11-apps/xdm package"
			return 1
		fi
	fi
	return 0
}

# Check to see if something is defined on our VT
vtstatic() {
	if [ -e /etc/inittab ] ; then
		grep -Eq "^[^#]+.*\<tty$1\>" /etc/inittab
	elif [ -e /etc/ttys ] ; then
		grep -q "^ttyv$(($1 - 1))" /etc/ttys
	else
		return 1
	fi
	return
}

start_pre() {
	setup_dm || return

	if [ -f /run/.nogui ]; then
		einfo "Skipping ${command##*/}, /run/.nogui found or 'nogui' bootparam passed."
		rm /run/.nogui
		return 1
	fi

	if vtstatic "${CHECKVT:-7}" ; then
		if [ -x /sbin/telinit ] && [ "${SOFTLEVEL}" != "BOOT" ] && [ "${RC_SOFTLEVEL}" != "BOOT" ]; then
			ewarn "Something is already defined on VT ${CHECKVT:-7}, will start X later"
			telinit a >/dev/null 2>&1
			return 0
		else
			eerror "Something is already defined on VT ${CHECKVT:-7}, not starting"
			return 1
		fi
	fi
	return 0
}

stop_pre() {
	if [ -t 0 ]; then
		if command -v fgconsole >/dev/null 2>&1; then
			curvt=$(fgconsole 2>/dev/null)
		else
			curvt=$(tty)
			case "${curvt}" in
				/dev/ttyv[0-9]*) curvt=${curvt#/dev/ttyv} ;;
				*) curvt= ;;
			esac
		fi
	fi
	return
}

stop_post() {
	# switch back to original vt
	if [ -n "${curvt}" ]; then
		if command -v chvt >/dev/null 2>&1; then
			chvt "${curvt}"
		else
			vidcontrol -s "$((curvt + 1))"
		fi
	fi
	return
}

# vim: set ts=4 :