anchor.diff:  { config, lib, pkgs, utils, ... }:
   let
     cfg = config.virtualisation.podman;
  +  toml = pkgs.formats.toml { };
   
     inherit (lib) mkOption types;
   
  
positive.code:       '';
      };
  
      extraPackages = mkOption {
        type = with types; listOf package;
        default = [ ];
  
negative.code: 
    };
  
    config = lib.mkIf cfg.enable (lib.mkMerge [
      {
        environment.systemPackages = [ cfg.package ]
          ++ lib.optional cfg.dockerCompat dockerCompat;
  
        environment.etc."cni/net.d/87-podman-bridge.conflist".source = utils.copyFile "${pkgs.podman-unwrapped.src}/cni/87-podman-bridge.conflist";
  
        virtualisation.containers = {
          enable = true; # Enable common /etc/containers configuration
          containersConf.extraConfig = lib.optionalString cfg.enableNvidia
            (builtins.readFile (toml.generate "podman.nvidia.containers.conf" {
              engine = {
                conmon_env_vars = [ "PATH=${lib.makeBinPath [ pkgs.nvidia-docker ]}" ];
                runtimes.nvidia = [ "${pkgs.nvidia-docker}/bin/nvidia-container-runtime" ];
              };
            }));
        };
  
        assertions = [
          {
            assertion = cfg.dockerCompat -> !config.virtualisation.docker.enable;
            message = "Option dockerCompat conflicts with docker";
          }
          {
            assertion = cfg.enableNvidia -> !config.virtualisation.docker.enableNvidia;
            message = "Option enableNvidia conflicts with docker.enableNvidia";
          }
        ];
      }
      (lib.mkIf cfg.enableNvidia {
        environment.etc."nvidia-container-runtime/config.toml".source = "${pkgs.nvidia-docker}/etc/podman-config.toml";
      })
    ]);
  }
  