Wayland
Wayland is a new display protocol that aims to replace X11. Wayland requires a seat manager to work.
The setup-wayland-base script installs and enables elogind as seat manager besides enabling community repository and eudev.
Compositors
Display servers that implement the Wayland display server protocol are also called Wayland compositors because they additionally perform the task of a compositing window manager.
Multiple compositor implementations exist, including Sway, Mutter (GNOME's compositor) and Kwin (KDE's compositor). The following compositors are available in Alpine Linux.
XDG_RUNTIME_DIR
As per the protocol spec, Wayland compositors require the XDG_RUNTIME_DIR variable to be set. Elogind seat manager handles XDG_RUNTIME_DIR and also export other XDG environment variables automatically for each session. So do not follow further configuration, if using elogind.
If Seatd is used then there are a few ways to create a XDG_RUNTIME_DIR directory and export this variable:
Use pam_rundir
pam_rundir is a PAM module that provides the runtime directory variable. Installing the package pam-rundir takes care of dependencies and no further configuration is required.
XDG_RUNTIME_DIR variable MUST be initialised before the Wayland compositor, and also before the D-Bus session instance is started in your startup script/file for both the methods listed below.Use mkrundir
mkrundir is an executable that can be used to initialise the runtime directory explicitly by each user. To use mkrundir, install the package mkrundir available in testing repository. In your shell init script (e.g.: ~/.profile include an entry as follows at the top of the file
Contents of ~.profile
As per mkrundir website, this might have issues inside containers, due to privilege escalation.
Configuring XDG_RUNTIME_DIR manually
Generally, care should be taken when configuring the XDG_* variables manually as this configuration may have errors or conflict with other utilities that do this automatically. Use this only on a system that's not using elogind and other solutions outlined above cannot handle this.
The XDG_RUNTIME_DIR can be initialised manually by adding below snippet to shell init scripts (e.g.: ~/.profile):
Contents of ~/.profile