set mass_storage function parameters in sheme

[johannG56]

Is there a way to set mass_storage function parameters in scheme ?
I have tried this syntax based on the examples i found on the repo :

functions : {
    mass_storage_usb0 : {
        instance = "usb0";
        type = "mass_storage";
        lun.0 = ({
                file = "/gadget-imgs/usbdisk.img";
        });
    };
};

but i get a syntax error.

am I typing it wrong or Is there some thing to implement to mage it work ?

[katyo]

@johannG56
Seems I set attributes in a right way (here #27) but it still hasn't effect.