+let lvm_type_register (lvm_name : string) probe_fn list_lvs_fn =
+ lvm_types := (lvm_name, (probe_fn, list_lvs_fn)) :: !lvm_types
+
+(* Probe a device for a PV. Returns [Some lvm_name] or [None]. *)
+let probe_for_pv dev =
+ if debug then eprintf "probing if %s is a PV ...\n%!" dev#name;
+ let rec loop = function
+ | [] -> None
+ | (lvm_name, (probe_fn, _)) :: rest ->
+ try Some (probe_fn lvm_name dev)
+ with Not_found -> loop rest
+ in
+ let r = loop !lvm_types in
+ if debug then (
+ match r with
+ | None -> eprintf "no PV found on %s\n%!" dev#name
+ | Some { lvm_plugin_id = name } ->
+ eprintf "%s contains a %s PV\n%!" dev#name name
+ );
+ r
+
+let list_lvs lvm_name devs =
+ let _, list_lvs_fn = List.assoc lvm_name !lvm_types in
+ list_lvs_fn devs
+
+(*----------------------------------------------------------------------*)
+
+(* This version by Isaac Trotts. *)
+let group_by ?(cmp = Pervasives.compare) ls =
+ let ls' =
+ List.fold_left
+ (fun acc (day1, x1) ->
+ match acc with
+ [] -> [day1, [x1]]
+ | (day2, ls2) :: acctl ->
+ if cmp day1 day2 = 0
+ then (day1, x1 :: ls2) :: acctl
+ else (day1, [x1]) :: acc)
+ []
+ ls
+ in
+ let ls' = List.rev ls' in
+ List.map (fun (x, xs) -> x, List.rev xs) ls'