weston-init: Stop running weston as root
Running the weston compositor as the root user is an insecure default behavior for OE-core. We can do much better, at least when using systemd. Change the recipe to create a dedicated "weston" user and start weston as this user. The systemd service and socket units are no longer template units, as there were several inconsistencies in the templates. Instead, there is now a global /run/wayland-0 socket that gets created, and systemd will start weston on demand when a client connects to that socket or when attempting to reach graphical.target, whichever comes first. This also allows downstream users to easily change the behavior so that weston *only* starts on demand by adding a drop file. Access to the global socket is controlled by a "wayland" group; any user that is a member of the group can use the socket to talk to the compositor. This also satisfies another use case where another systemd service might start a graphical application that needs to display with weston (e.g. a single function device in kiosk mode). Finally, the udev rules for starting weston with the existance of a DRM device have been removed. Being WantedBy= a graphical target should eliminate the need for this behavior, and having it present makes it difficult for downstream users to start weston on demand (having to override the udev rules). Signed-off-by:Joshua Watt <JPEWhacker@gmail.com> Signed-off-by:
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