The shutdown interface is currently only exposed via dbus. This PR adds a comparable varlink implementation. It is inspired by the existing dbus methods and implements PowerOff, Reboot, Halt, Kexec, SoftReboot as varlink methods on a new io.systemd.Shutdown interface. It is (intentional) simpler than the dbus for now, i.e. no Can* yet, mostly because I want to get feedback first (happy to do that in a followup). The only real difficulty here is what to do about verify_shutdown_creds() as this is needed by both dbus and varlink and its dbus only. I went for an ugly but (hopefully) pragmatic choice (see the commit message for details). But I can totally understand if a refactor instead is preferred.
System and Service Manager
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