Seatd
Seatd is a seat management daemon, that does everything it needs to do. Nothing more, nothing less. Depends only on libc. Seat management takes care of mediating access to shared devices (graphics, input), without requiring the applications needing access to be root.
When using elogind, seatd is not required and viceversa. Don't add both to auto-start.
Installation
apk add seatd # install seatd rc-update add seatd # configure it to auto-start service seatd start # start it now adduser $USER seat # allow current user to access seatd
If you are already logged in as a $USER, you will need to relogin.
Configuration
Ensure that XDG_RUNTIME_DIR is set before starting your Wayland compositor.
Seatd and polkit
polkit can be used for authentication with seatd if you use groups in the polkit rules. With seatd you are restricted to YES or NO rules.
A sample polkit rule file /etc/polkit-1/rules.d/50-my-custom-rules.rules which allow members of the "wheel" group to reboot without a password. This rule depends only on group membership which works with seatd can be as follows:
Contents of /etc/polkit-1/rules.d/50-my-custom-rules.rules
Elogind is required for "subject.active" rules and no AUTH_ADMIN, since polkit agents need POLKIT_IS_SUBJECT. Given below is a sample polkit rule file /etc/polkit-1/rules.d/51-require-active-session.rules which allow only active local sessions to suspend based on subject.active which requires Elogind can be as follows:
Contents of /etc/polkit-1/rules.d/51-require-active-session.rules