FetchAPIFromContext returns the DeviceAPI stored in ctx, or an error if there is none.

FindPortal is a helper function to work out which portal interface should be used for getting information on running apps.

GetHardwareDetails will try to get a hardware vendor and model from DBus.

GetHostname will try to fetch the hostname of the device from DBus.

NewDeviceAPI sets up a DeviceAPI struct with appropriate DBus API endpoints.

StoreAPIInContext returns a new Context that embeds a DeviceAPI.