In GDBus it's possible to watch for a particular name to appear on the bus with g_bus_watch_name_on_connection(). It's also possible to be notified about new interfaces/objects added on objects implementing the org.freedesktop.DBus.ObjectManager interface. I cannot however find a way to be notified about the appearance of the top-level ObjectManager on the bus. In other words:
We have a name org.foobar which exports an ObjectManager at /org/foobar which manages /org/foobar/abc and /org/foobar/xyz.
I can get notified about the name acquisition of org.foobar and about the addition of /org/foobar/abc and /org/foobar/xyz. However some time passes between when the org.foobar name is taken and then the /org/foobar object appears. How do I programmatically and correctly wait for it in GLib?
