the great update

overlays/default.nix

@@ -0,0 +1,11 @@
+{ config, pkgs, lib, ... }:
+{
+  nixpkgs.overlays = [
+    (final: prev: {
+      qemu_full = prev.qemu_full.override {
+        cephSupport = false;
+        xenSupport = false;
+      };
+    })
+  ];
+}