xstart

#!/usr/bin/env bash
# xstart - dead simple combination of xinit and startx

# requires Xorg xset xauth timeout moreutils bash

#log redirection
logfile="$XDG_LOG_HOME"/xorg.log
exec > >(ts '[%Y-%m-%d %H:%M:%S]'|tee -i $logfile)
exec 2>&1

echo Starting xstart

trap 'cleanup "$pid"' EXIT
readonly stty=$(stty -g)

error() {
    # shellcheck disable=SC2059
    printf -- "xstart: $2" "${@:3}" >&2
    exit "$1"
}

warn() {
    # shellcheck disable=SC2059
    printf -- "xstart:" "${@:2}" >&2
}

cleanup() {
    if [ "$(ps -o comm= "$1")" = Xorg ]; then
        kill "$1"

        # Send SIGKILL after 10 seconds if the xserver is taking too long to
        # terminate.
        timeout 10 tail --pid="$1" -f /dev/null

        case $? in
            124) kill -s KILL "$1"
        esac

        xauth remove :"$tty"
    fi

    if ! stty "$stty"; then
        stty sane
    fi

    exit
}

export XHOME=${XHOME:-$HOME}
export XSERVERRC=${XSERVERRC:-$XHOME/.xserverrc}
XAUTHORITY=${XAUTHORITY:-$XDG_RUNTIME_HOME/xauthority}
export XDEFAULT=${XDEFAULT:-$XHOME/.xdesktop}
export XPROFILE=${XPROFILE:-$XHOME/.xprofile}
XPROFILESYS=/etc/xprofile
export XRESOURCES=${XRESOURCES:-$XHOME/.Xresources}
XRESOURCESSYS=/etc/X11/xinit/.Xresources
export XMODMAP=${XMODMAP:-$XHOME/.Xmodmap}
XMODMAPSYS=/etc/X11/xinit/.Xmodmap

if [ "$DISPLAY" ]; then
    error 1 '%s: DISPLAY already present\n' "$DISPLAY"
fi

if ! readonly tty=$(fgconsole); then
    exit
fi

echo Creating Xauthority in "$XAUTHORITY"

touch "$XAUTHORITY"
export XAUTHORITY

# NOTE: Clobbers existing entries.
xauth add :"$tty" MIT-MAGIC-COOKIE-1 "$(mcookie)"

echo Finished seting up Xauthority

echo Loading Xserver

$XSERVERRC :"$tty" -auth "$XAUTHORITY" & pid=$!

export DISPLAY=:$tty

echo Establishing connection to Xserver

# Wait for the xserver to become available before continuing.
# NOTE: This is the same logic xinit(1) uses.
attempts=60
until xset q > /dev/null 2>&1; do
    if [ "$attempts" -gt 0 ]; then
        attempts=$((attempts - 1))
        sleep 1
    else
        error 1 '%s: failed to connect to the server, giving up\n' "$DISPLAY"
    fi
done

echo Connected to Xserver to Xserver

# merge in defaults and keymaps and source profile
echo Parsing Xserver

[ -f "$XPROFILESYS" ] && . "$XPROFILESYS"
[ -f "$XPROFILE" ] && . "$XPROFILE"

echo Loading Xreasources

[ -f "$XRESOURCESSYS" ] && xrdb -merge "$XRESOURCESSYS"
[ -f "$XRESOURCES" ] && xrdb -merge -I$XHOME $XRESOURCES

echo loading key boad configuration

[ -f "$XMODMAPSYS" ] && xmodmap "$XMODMAPSYS"
[ -f "$XMODMAP" ] && xmodmap "$XMODMAP"

echo configuration loaded
# start some nice programs

if [ -d /etc/X11/xinit/xinitrc.d ] ; then
    for f in /etc/X11/xinit/xinitrc.d/?*.sh ; do
        [ -x "$f" ] && . "$f"
    done
    unset f
fi

(
    unset XDG_SEAT
    unset XDG_SESSION_ID
    unset XDG_VTNR

    dbus-update-activation-environment --systemd --all
)

systemctl --user start graphical.target

echo Loading the xclient

session_default="$(cat "$XDEFAULT")"

session=${1:-"$session_default"}

if [ "x$session" == "x" ]; then
    warn NO VALID SESSION FOUND. FALLING BACK TO XTERM
    session=xterm
fi

case $session in
    kde|plasma)
        echo Loading KDE Plasma
        startkde
        ;;
    openbox|openbox3)
        echo Loading Openbox
        export XDG_CONFIG_HOME=${XDG_CONFIG_HOME:-"$HOME/.config"}
        [ -f "/etc/xdg/openbox/environment" ] && . "/etc/xdg/openbox/environment"
        [ -f "$XDG_CONFIG_HOME/openbox/environment" ] && . "$XDG_CONFIG_HOME/openbox/environment"
        [ -f "/etc/xdg/openbox/autostart" ] && . "/etc/xdg/openbox/autostart"
        [ -f "$XDG_CONFIG_HOME/openbox/autostart" ] && . "$XDG_CONFIG_HOME/openbox/autostart"
        openbox
        ;;
    xinit)
        echo Loading the system default
        /etc/X11/xinitrc
        ;;
    # No known session, try to run it as command
    *)
        echo Loading $session
        "${1+"$@"}"
    ;;
esac

EXIT_CODE=$?

systemctl --user stop graphical.target

echo xclient terminated with exit $EXIT_CODE
echo Terminating the Xserver

cleanup "$pid"