2024-10-06

Trying to get full session in xwayland under WSL2.
https://gist.github.com/tdcosta100/e28636c216515ca88d1f2e7a2e188912

On Debian (not Ubuntu), one needs

echo "LANG=en_US.UTF-8" | sudo tee -a /etc/default/locale

Fix /tmp/.X11-unix, which is mounted read-only by default.

sudo systemctl edit --full --force wslg-fix.service

Then, in the editor, enter the following:

[Service]
Type=oneshot
ExecStart=-/usr/bin/umount /tmp/.X11-unix
ExecStart=/usr/bin/rm -rf /tmp/.X11-unix
ExecStart=/usr/bin/mkdir /tmp/.X11-unix
ExecStart=/usr/bin/chmod 1777 /tmp/.X11-unix
ExecStart=/usr/bin/ln -s /mnt/wslg/.X11-unix/X0 /tmp/.X11-unix/X0
ExecStart=/usr/bin/chmod 0777 /mnt/wslg/runtime-dir
ExecStart=/usr/bin/chmod 0666 /mnt/wslg/runtime-dir/wayland-0.lock

[Install]
WantedBy=multi-user.target

Then:

sudo systemctl enable wslg-fix.service

Remove all references to Wayland. If not, some apps (like gnome-terminal) will open outside xwayland.
```
sudo systemctl edit user-runtime-dir@.service
```
Then, in the editor, paste the following:
```
[Service]
ExecStartPost=-/usr/bin/rm -f /run/user/%i/wayland-0 /run/user/%i/wayland-0.lock
```
Change default startup-target. If not, a shell-window will appear every time you start your distro.
```
sudo systemctl set-default multi-user.target
```

Back up original Xorg script:

sudo mv /usr/bin/Xorg /usr/bin/Xorg.original

Make new /usr/bin/Xorg.Xwayland:

#!/bin/bash
for arg do
  shift
  case $arg in
    # Xwayland doesn't support vtxx argument. So we convert to ttyxx instead
    vt*)
      set -- "$@" "${arg//vt/tty}"
      ;;
    # -keeptty is not supported at all by Xwayland
    -keeptty)
      ;;
    # -novtswitch is not supported at all by Xwayland
    -novtswitch)
      ;;
    # other arguments are kept intact
    *)
      set -- "$@" "$arg"
      ;;
  esac
done

# Check if the runtime dir is present, and create it if not
if [ ! -d $HOME/runtime-dir ]
then
  mkdir $HOME/runtime-dir
  ln -s /mnt/wslg/runtime-dir/wayland-0 /mnt/wslg/runtime-dir/wayland-0.lock $HOME/runtime-dir/
fi

# Point the XDG_RUNTIME_DIR variable to $HOME/runtime-dir
export XDG_RUNTIME_DIR=$HOME/runtime-dir

# Find an available display number
for displayNumber in $(seq 1 100)
do
  [ ! -e /tmp/.X11-unix/X$displayNumber ] && break
done

# Here you can change or add options to fit your needs
command=("/usr/bin/Xwayland" ":${displayNumber}" "-geometry" "1920x1080" "-fullscreen" "$@")

systemd-cat -t /usr/bin/Xorg echo "Starting Xwayland:" "${command[@]}"

exec "${command[@]}"

Then:

sudo chmod 0755 /usr/bin/Xorg.Xwayland
sudo ln -sf Xorg.Xwayland /usr/bin/Xorg

That last step might need to be repeated after running apt to update.

Configure resolution of monitor:

mkdir -p ~/.config
vim ~/.config/monitors.xml

Paste this:

<monitors version="2">
  <configuration>
    <logicalmonitor>
      <x>0</x>
      <y>0</y>
      <scale>1</scale>
      <primary>yes</primary>
      <monitor>
        <monitorspec>
          <connector>XWAYLAND0</connector>
          <vendor>unknown</vendor>
          <product>unknown</product>
          <serial>unknown</serial>
        </monitorspec>
        <mode>
          <width>1920</width>
          <height>1080</height>
          <rate>59.963</rate>
        </mode>
      </monitor>
    </logicalmonitor>
  </configuration>
</monitors>

At the end:
```
sudo systemctl start graphical.target
```