convert custom package

config/base.nix

@@ -1,26 +1,33 @@
 { config, pkgs, lib, ... }:
 #let
-  #disko = pkgs.callPackage ../pkgs/disko/package.nix {};
-  #disko = "github:nix-community/disko"
+#  installFiles = pkgs.runCommand "install-files" {
+#    #inherit (pkgs) coreutils;
+#  } ''
+#    mkdir -p $out
+#    cp -rv ${./initrd-include}/* $out/
+#  '';
 #in
-let
-  installFiles = pkgs.runCommand "install-files" {
-    #inherit (pkgs) coreutils;
-  } ''
-    mkdir -p $out
-    cp -rv ${./initrd-include}/* $out/
-  '';
-in
+## above is the olde installFiles Declaration. 
 {
+    options.myPackages.installFiles = lib.mkOption {
+    type = lib.types.package;
+  };
   imports = [ 
     ../quickly.nix
     ## installer.nix is a system service to run a script on boot
     ../installer/installer.nix
     ];
+  #_module.args = { inherit installFiles; }; ##uncomment to pass installFiles to modules
  config = {
+  myPackages.installFiles = pkgs.runCommand "install-files" "..." {
+    #inherit (pkgs) coreutils;
+  } ''
+    mkdir -p $out
+    cp -rv ${./initrd-include}/* $out/
+  '';
   services.getty.autologinUser = "nixos";
   security.sudo.wheelNeedsPassword = false;
-  services.getty.loginProgram = "${installFiles}/bin/install.sh";
+  services.getty.loginProgram = "${config.myPackages.installFiles}/bin/install.sh";
    users.users.nixos = {
      isNormalUser = true;
      password = "password";
@@ -45,7 +52,7 @@ in
        pkgs.nixos-install-tools
        pkgs.util-linux
        pkgs.nettools
-       installFiles
+       config.myPackages.installFiles
     ];
 
   };

installer/installer.nix

@@ -16,7 +16,7 @@
       # Your installation commands here
       if [ ! -f /etc/installation-completed ]; then
         # Run your installation steps
-        "${pkgs.installFiles}/bin/install.sh"
+        "${config.myPackages.installFiles}/bin/install.sh"
         # Mark as completed
         touch /etc/installation-completed
       fi