{
  self,
  nixpkgs,
  ...
}:
nixpkgs.lib.extend (
  _final: prev: let
    inherit (prev) mkIf;
  in {
    extensions = {
      createvm = {
        name,
        system ? nixpkgs.system,
        config,
      }: {microvm, ...}: {
        imports = [microvm.host];
        microvm.vms.${name} = {
          pkgs = import nixpkgs {inherit system;};
          inherit config;
          # Host build-time reference to where the MicroVM NixOS is defined
          # under nixosConfigurations
          flake = self;
          # Specify from where to let `microvm -u` update later on
          updateFlake = "git+file:///etc/nixos";
        };
      };
    };
  }
)