external umount_all : t -> unit = "ocaml_guestfs_umount_all"
external lvm_remove_all : t -> unit = "ocaml_guestfs_lvm_remove_all"
external file : t -> string -> string = "ocaml_guestfs_file"
external umount_all : t -> unit = "ocaml_guestfs_umount_all"
external lvm_remove_all : t -> unit = "ocaml_guestfs_lvm_remove_all"
external file : t -> string -> string = "ocaml_guestfs_file"