+external checksum : t -> string -> string -> string = "ocaml_guestfs_checksum"
+external tar_in : t -> string -> string -> unit = "ocaml_guestfs_tar_in"
+external tar_out : t -> string -> string -> unit = "ocaml_guestfs_tar_out"
+external tgz_in : t -> string -> string -> unit = "ocaml_guestfs_tgz_in"
+external tgz_out : t -> string -> string -> unit = "ocaml_guestfs_tgz_out"
+external mount_ro : t -> string -> string -> unit = "ocaml_guestfs_mount_ro"
+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 lvremove : t -> string -> unit = "ocaml_guestfs_lvremove"
+external vgremove : t -> string -> unit = "ocaml_guestfs_vgremove"
+external pvremove : t -> string -> unit = "ocaml_guestfs_pvremove"