external mount_options : t -> string -> string -> string -> unit = "ocaml_guestfs_mount_options"
external mount_vfs : t -> string -> string -> string -> string -> unit = "ocaml_guestfs_mount_vfs"
external debug : t -> string -> string array -> string = "ocaml_guestfs_debug"
external mount_options : t -> string -> string -> string -> unit = "ocaml_guestfs_mount_options"
external mount_vfs : t -> string -> string -> string -> string -> unit = "ocaml_guestfs_mount_vfs"
external debug : t -> string -> string array -> string = "ocaml_guestfs_debug"