CP-42182 Add CLI tool on xe and rrd-cli to enable saving of rrds to local host

Makefile

@@ -8,9 +8,11 @@ build:
 
 install:
 	install -D _build/install/default/bin/xcp-rrdd $(DESTDIR)$(SBINDIR)/xcp-rrdd
+	install -D _build/install/default/bin/rrd-cli $(DESTDIR)$(SBINDIR)/rrd-cli
 
 uninstall:
 	rm -f $(DESTDIR)$(SBINDIR)/xcp-rrdd
+	rm -f $(DESTDIR)$(SBINDIR)/rrd-cli
 
 clean:
 	dune clean

cli/dune

@@ -0,0 +1,12 @@
+(executable
+ (name rrd_cli)
+ (public_name rrd-cli)
+ (package xapi-rrdd)
+ (modules rrd_cli)
+ (libraries
+   cmdliner
+   rpclib.cmdliner
+   rpclib.markdown
+   xapi-idl.rrd
+ ))
+

cli/rrd_cli.ml

@@ -0,0 +1,27 @@
+(* Rrd CLI *)
+
+module Cmds = Rrd_interface.RPC_API (Cmdlinergen.Gen ())
+
+let version_str description =
+  let maj, min, mic = description.Idl.Interface.version in
+  Printf.sprintf "%d.%d.%d" maj min mic
+
+let default_cmd =
+  let doc =
+    String.concat ""
+      [
+        "A CLI for the Db monitoring API. This allows scripting of the Rrd \
+         daemon "
+      ; "for testing and debugging. This tool is not intended to be used as an "
+      ; "end user tool"
+      ]
+  in
+  ( Cmdliner.Term.(ret (const (fun _ -> `Help (`Pager, None)) $ const ()))
+  , Cmdliner.Term.info "rrd-cli" ~version:(version_str Cmds.description) ~doc )
+
+let cli () =
+  let rpc = Rrd_client.rpc in
+  Cmdliner.Term.eval_choice default_cmd
+    (List.map (fun t -> t rpc) (Cmds.implementation ()))
+
+let _ = cli ()