gui@.service

[Unit]
Conflicts=getty@tty%i.service
After=systemd-user-sessions.service

[Service]
User=gui
PAMName=login

TTYPath=/dev/tty%I
TTYReset=yes
TTYVHangup=yes
TTYVTDisallocate=yes

UtmpIdentifier=tty%I
UtmpMode=user

Environment=XDG_VTNR=%I
Environment=XDG_SESSION_CLASS=user
Environment=XDG_SESSION_TYPE=x11
Environment=XDG_SESSION_DESKTOP=i3

ExecStart=/home/gui/.xinitrc

[Install]
WantedBy=graphical.target

ls -l startx.target.wants

total 8.0K
drwxr-xr-x 2 fraggod fraggod 4.0K Mar  4  2019 .
drwxr-xr-x 4 fraggod fraggod 4.0K Mar  4  2019 ..
lrwxrwxrwx 1 fraggod fraggod   18 Sep 10  2018 compton.service -> ../compton.service
lrwxrwxrwx 1 fraggod fraggod   13 Sep  9  2018 i3.service -> ../i3.service
lrwxrwxrwx 1 fraggod fraggod   19 Sep 11  2018 switcher.service -> ../switcher.service
lrwxrwxrwx 1 fraggod fraggod   17 Mar  4  2019 x11vnc.service -> ../x11vnc.service
lrwxrwxrwx 1 fraggod fraggod   14 Sep  9  2018 xorg.target -> ../xorg.target

ls -l xorg.target.wants

total 8.0K
drwxr-xr-x 2 fraggod fraggod 4.0K Sep  9  2018 .
drwxr-xr-x 4 fraggod fraggod 4.0K Mar  4  2019 ..
lrwxrwxrwx 1 fraggod fraggod   15 Sep  9  2018 xorg.service -> ../xorg.service
lrwxrwxrwx 1 fraggod fraggod   26 Sep  9  2018 xorg-start-wait.service -> ../xorg-start-wait.service

startx.target

[Unit]
Description=X session

xinitrc

#!/bin/bash

env_pids=()
exit_cleanup() {
        systemctl --user --no-block exit &
        disown # to avoid lockups in case of systemd/dbus fails
        for pid in "${env_pids[@]}"; do kill "$pid" 2>/dev/null; done
}
trap exit_cleanup TERM INT

source /etc/profile
export DISPLAY=:1 # hardcoded in systemd units
systemctl --user import-environment
systemctl --user start startx.target

# X screensaver/dpms "always on" settings
xset s off s noblank dpms force on -dpms

sleep infinity &
env_pids+=( $! )
wait

exit 0

xorg-start-wait.service

# This unit waits for Xorg to to avoid race conditions
#  when starting everything that relies on Xorg server running.
# Needed because Xorg socket activation does not work
#  since 1.18+: https://bugs.freedesktop.org/show_bug.cgi?id=93072

[Unit]
PartOf=xorg.target

[Service]
Type=oneshot
ExecStart=/usr/bin/mkdir -pm1777 /tmp/.X11-unix
ExecStart=/bin/bash -c "\
        trap 'pkill -g 0' EXIT; trap 'exit' TERM; \
        inotifywait -qq -e create /tmp/.X11-unix/ & \
        [[ -e /tmp/.X11-unix/X1 ]] || wait"

xorg.service

[Unit]
PartOf=xorg.target

[Service]
SyslogIdentifier=%p
SuccessExitStatus=0 1
ExecStart=/usr/bin/X :1 -nolisten tcp -verbose 0 vt${XDG_VTNR}

xorg.target

[Unit]