guest/trusty/common/Android.bp

soong_config_module_type {
    name: "trusty_vm_prebuilt_etc",
    module_type: "prebuilt_etc",
    config_namespace: "trusty_system_vm",
    bool_variables: [
        "enabled",
        "placeholder_trusted_hal",
    ],
    properties: ["src"],
}

soong_config_module_type {
    name: "trusty_vm_avb_add_hash_footer",
    module_type: "avb_add_hash_footer",
    config_namespace: "trusty_system_vm",
    bool_variables: ["enabled"],
    properties: ["src"],
}

prebuilt_etc {
    name: "early_vms.xml",
    filename: "early_vms.xml",
    relative_install_path: "avf",
    system_ext_specific: true,
    enabled: select(soong_config_variable("trusty_system_vm", "enabled"), {
        true: true,
        default: false,
    }),
    src: select(soong_config_variable("trusty_system_vm", "enabled"), {
        true: "early_vms.xml",
        default: ":empty_file",
    }),
}