+external is_ready : t -> bool = "ocaml_guestfs_is_ready"
+external is_config : t -> bool = "ocaml_guestfs_is_config"
+external is_launching : t -> bool = "ocaml_guestfs_is_launching"
+external is_busy : t -> bool = "ocaml_guestfs_is_busy"
+external get_state : t -> int = "ocaml_guestfs_get_state"