+external pvresize : t -> string -> unit = "ocaml_guestfs_pvresize"
+external sfdisk_N : t -> string -> int -> int -> int -> int -> string -> unit = "ocaml_guestfs_sfdisk_N_byte" "ocaml_guestfs_sfdisk_N"
+external sfdisk_l : t -> string -> string = "ocaml_guestfs_sfdisk_l"
+external sfdisk_kernel_geometry : t -> string -> string = "ocaml_guestfs_sfdisk_kernel_geometry"
+external sfdisk_disk_geometry : t -> string -> string = "ocaml_guestfs_sfdisk_disk_geometry"