external kill_subprocess : t -> unit = "ocaml_guestfs_kill_subprocess"
external add_drive : t -> string -> unit = "ocaml_guestfs_add_drive"
external add_cdrom : t -> string -> unit = "ocaml_guestfs_add_cdrom"
+external add_drive_ro : t -> string -> unit = "ocaml_guestfs_add_drive_ro"
external config : t -> string -> string option -> unit = "ocaml_guestfs_config"
external set_qemu : t -> string -> unit = "ocaml_guestfs_set_qemu"
external get_qemu : t -> string = "ocaml_guestfs_get_qemu"