How to check the exposed services?

[Geevarghese V K]

Dear team,

The main purpose of session manager is to launch the startup service and expose the services mentioned in session_manager.cml file.But i have few queries.

1) Where can i find this path ? 

/// The path to the configuration file for the session.

const CONFIG_PATH: &str = "/config/data/startup.config";

2) How to check whether the fidl services  are actually exposed?

pub async fn expose_services(&mut self) -> Result<(), Error> {

        let mut fs = ServiceFs::new_local();

        fs.dir("svc")

            .add_fidl_service(ExposedServices::ElementManager)

            .add_fidl_service(ExposedServices::Launcher)

            .add_fidl_service(ExposedServices::Restarter)

            .add_fidl_service(ExposedServices::InputDeviceRegistry);

        fs.take_and_serve_directory_handle()?;

[Gabe Schine]

+component-framework-dev 

Hi Geevarghese,

Find answers inline.

 

1) Where can i find this path ? 

/// The path to the configuration file for the session.

const CONFIG_PATH: &str = "/config/data/startup.config";

This path is mapped to a configuration file mapped in at build-time. The component_manager (parent of session_manager) performs the mapping. At runtime, session_manager finds whatever file was mapped in at build-time at /config/data/startup.config. You can read more about config_data mapping here:

https://fuchsia.dev/fuchsia-src/development/components/config_data

From there, you can probably find the BUILD.gn file that maps startup.config for session_manager. Let me know if you have any trouble.

 

2) How to check whether the fidl services  are actually exposed?

pub async fn expose_services(&mut self) -> Result<(), Error> {

        let mut fs = ServiceFs::new_local();

        fs.dir("svc")

            .add_fidl_service(ExposedServices::ElementManager)

            .add_fidl_service(ExposedServices::Launcher)

            .add_fidl_service(ExposedServices::Restarter)

            .add_fidl_service(ExposedServices::InputDeviceRegistry);

        fs.take_and_serve_directory_handle()?;

At runtime, you can inspect what services are exposed by a running component by looking at the "hub". You can read about the hub here:

https://fuchsia.dev/fuchsia-src/concepts/components/v2/hub?hl=en

 

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[Yegor Pomortsev]

Re: #1, Session_manager is almost always configured through the session_config GN template, rather than using config_data directly.

It serves two purposes:

1. Store the given file in as /config/data/startup.config for component_manager_sfw, which offers the whole dir to session_manager.

2. Configure sysmgr to start component_manager_sfw/session_manager on boot.