Merge master into staging-next

nixos/modules/system/boot/loader/grub/grub.nix

@@ -83,7 +83,7 @@ let
              ] ++ (optional (cfg.fontSize!=null) "--size ${toString cfg.fontSize}")))
          );
 
-  defaultSplash = "${pkgs.nixos-artwork.wallpapers.simple-dark-gray-bootloader}/share/artwork/gnome/nix-wallpaper-simple-dark-gray_bootloader.png";
+  defaultSplash = pkgs.nixos-artwork.wallpapers.simple-dark-gray-bootloader.gnomeFilePath;
 in
 
 {

nixos/modules/system/boot/stage-1.nix

@@ -584,7 +584,7 @@ in
       { assertion = !config.boot.loader.supportsInitrdSecrets ->
           all (source:
             builtins.isPath source ||
-            (builtins.isString source && hasPrefix source builtins.storeDir))
+            (builtins.isString source && hasPrefix builtins.storeDir source))
           (attrValues config.boot.initrd.secrets);
         message = ''
           boot.loader.initrd.secrets values must be unquoted paths when