hi

overlay.nix

@@ -0,0 +1,14 @@
+_: pkgs: {
+  docker-nixpkgs = rec {
+
+    curl = pkgs.callPackage ./curl {};
+
+    nix = pkgs.callPackage ./nix {};
+
+    # docker images must be lower-cased
+    nix-unstable = nix.overrideAttrs (self: { 
+      nix = pkgs.nixUnstable;
+    });
+
+  };
+}