xwayland-satellite grants rootless Xwayland integration to any Wayland compositor implementing xdg_wm_base. This is particularly useful for compositors that (understandably) do not want to go through implementing support for rootless Xwayland themselves.
Run xwayland-satellite. You can specify an X display to use (i.e. :12). Be sure to set the same DISPLAY environment variable for any X11 clients.
Because xwayland-satellite is a Wayland client (in addition to being a Wayland compositor), it will need to launch after your compositor launches, but obviously before any X11 applications.
cargo build
cargo runxwayland-satellite can be built with systemd support - simply add -F systemd to your build command - i.e. cargo build --release -F systemd.
With systemd support, satellite will send a state change notification when Xwayland has been initialized, allowing for having services dependent on satellite's startup.
An example service file is located in resources/xwayland-satellite.service - be sure to replace the ExecStart line with the proper location before using it. It can be placed in a systemd user unit directory (i.e. $XDG_CONFIG_HOME/systemd/user or /etc/systemd/user), and be launched and enabled with systemctl --user enable --now xwayland-satellite. It will be started when the graphical-session.target is reached, which is likely after your compositor is started if it supports systemd.