Use swaybg to change the background

background.lua

@@ -0,0 +1,3 @@
+hl.on("hyprland.start", function()
+	hl.exec_cmd("swaybg -m stretch -i ./wallpaper/XP.jpg")
+end)

flake.nix

@@ -13,13 +13,23 @@
       };
 
       hypr = pkgs.hyprland;
-      configFile = "${self}/hyprland.lua";
+
+      configDir = pkgs.lib.cleanSource ./.;
+      configFile = "${configDir}/hyprland.lua";
+
+      runtimePackages = with pkgs; [
+        swaybg
+      ];
+
+      runtimePath = pkgs.lib.makeBinPath runtimePackages;
 
       verifyScript = pkgs.writeShellScript "hyprland-verify" ''
+        export PATH=${runtimePath}:$PATH
         exec ${hypr}/bin/Hyprland --config ${configFile} --verify-config
       '';
 
       runScript = pkgs.writeShellScript "hyprland-run" ''
+        export PATH=${runtimePath}:$PATH
         exec ${hypr}/bin/Hyprland --config ${configFile}
       '';
     in
@@ -36,6 +46,9 @@
         };
       };
 
-      packages.${system}.default = hypr;
+      packages.${system}.default = pkgs.runCommand "hyprland-config-check" { } ''
+        ${verifyScript}
+        touch $out
+      '';
     };
 }

hyprland.lua

@@ -1 +1,2 @@
 require("monitor")
+require("background")