I want to check if shutdown is available to the current user( in javascript, not shell command). I have try this command in shell:
dbus-send --session --type=method_call --print-reply --dest=org.gnome.SessionManager /org/gnome/SessionManager org.gnome.SessionManager.CanShutdown
I got the return message"boolen true"
In gnome's documentaion, I can see this line: CanShutdown (out 'b' is_available), but I don't know how to use outsignatue in js.
Can anyone tell me how to do? Or some other documentions. THANK YOU!