external pvs_full : t -> lvm_pv array = "ocaml_guestfs_pvs_full"
external vgs_full : t -> lvm_vg array = "ocaml_guestfs_vgs_full"
external lvs_full : t -> lvm_lv array = "ocaml_guestfs_lvs_full"
+external read_lines : t -> string -> string array = "ocaml_guestfs_read_lines"