ddclient: Make verbose logging deactivatable.

nixos/modules/services/networking/ddclient.nix

@@ -7,7 +7,7 @@ let
 
   stateDir = "/var/spool/ddclient";
   ddclientUser = "ddclient";
-  ddclientFlags = "-foreground -verbose -noquiet -file ${config.services.ddclient.configFile}";
+  ddclientFlags = "-foreground -file ${config.services.ddclient.configFile}";
   ddclientPIDFile = "${stateDir}/ddclient.pid";
 
 in
@@ -102,6 +102,22 @@ in
           Method to determine the IP address to send to the dynamic DNS provider.
         '';
       };
+
+      verbose = mkOption {
+        default = true;
+        type = bool;
+        description = ''
+          Print verbose information.
+        '';
+      };
+
+      quiet = mkOption {
+        default = false;
+        type = bool;
+        description = ''
+          Print no messages for unnecessary updates.
+        '';
+      };
     };
   };
 
@@ -136,6 +152,8 @@ in
           lib.optionalString (server != "") "server=${server}"}
         ssl=${if config.services.ddclient.ssl then "yes" else "no"}
         wildcard=YES
+        quiet=${if config.services.ddclient.quiet then "yes" else "no"}
+        verbose=${if config.services.ddclient.verbose then "yes" else "no"}
         ${config.services.ddclient.domain}
         ${config.services.ddclient.extraConfig}
       '';