nixos vdr: introduce option enableLirc

also introduce option socket for lirc, to have access to socket path

nixos/modules/services/hardware/lirc.nix

@@ -33,6 +33,13 @@ in {
         description = "Extra arguments to lircd.";
       };
 
+      socket = mkOption {
+        type = types.path;
+        # default search path of many applications
+        default = "/run/lirc/lircd";
+        description = "Socket path";
+      };
+
     };
   };
 
@@ -49,8 +56,7 @@ in {
       description = "LIRC daemon socket";
       wantedBy = [ "sockets.target" ];
       socketConfig = {
-        # default search path
-        ListenStream = "/run/lirc/lircd";
+        ListenStream = cfg.socket;
         SocketUser = "lirc";
         SocketMode = "0660";
       };

nixos/modules/services/hardware/vdr.nix

@@ -33,12 +33,14 @@ in {
         default = [];
         description = "Additional command line arguments to pass to VDR.";
       };
+
+      enableLirc = mkEnableOption "enable LIRC";
     };
   };
 
   ###### implementation
 
-  config = mkIf cfg.enable {
+  config = mkIf cfg.enable (mkMerge [{
     systemd.tmpfiles.rules = [
       "d ${cfg.videoDir} 0755 vdr vdr -"
       "Z ${cfg.videoDir} - vdr vdr -"
@@ -67,5 +69,13 @@ in {
     };
 
     users.groups.vdr = {};
-  };
+  }
+
+  (mkIf cfg.enableLirc {
+    services.lirc.enable = true;
+    users.users.vdr.extraGroups = [ "lirc" ];
+    services.vdr.extraArguments = [
+      "--lirc=${config.services.lirc.socket}"
+    ];
+  })]);
 }