smartd: Add options for each device being monitored

modules/services/monitoring/smartd.nix

@@ -24,7 +24,7 @@ let
 
   smartdConf = pkgs.writeText "smartd.conf" (concatMapStrings (device:
     ''
-      ${device} -a -m root -M exec ${smartdMail}
+      ${device} -a -m root -M exec ${smartdMail} ${cfg.deviceOpts}
     ''
     ) cfg.devices);
 
@@ -50,6 +50,17 @@ in
         '';
       };
 
+      deviceOpts = mkOption {
+        default = "";
+        type = types.string;
+        example = "-o on -s (S/../.././02|L/../../7/04)";
+        description = ''
+          Additional options for each device that is monitored. The example
+          turns on SMART Automatic Offline Testing on startup, and schedules short
+          self-tests daily, and long self-tests weekly. 
+        '';
+      };
+
       devices = mkOption {
         default = [];
         example = ["/dev/sda" "/dev/sdb"];