anchor.diff:        storeContents = [
           {
             object = config.system.build.toplevel;
  -          symlink = "none";
  -        }
  -        {
  -          object = pkgs.stdenv;
             symlink = "none";
           }
         ];
  
positive.code:     # Containers should be light-weight, so start sshd on demand.
      services.openssh.enable = mkDefault true;
      services.openssh.startWhenNeeded = mkDefault true;
  
      # Allow ssh connections
      services.openssh.openFirewall = mkDefault true;
    };
  }
  
negative.code:       templates = mkOption {
          description = "Templates for LXD";
          type = types.attrsOf (types.submodule (templateSubmodule));
          example = literalExample ''
            {
              # create /etc/hostname on container creation
              "hostname" = {
                enable = true;
                target = "/etc/hostname";
                template = builtins.writeFile "hostname.tpl" "{{ container.name }}";
                when = [ "create" ];
              };
              # create /etc/nixos/hostname.nix with a configuration for keeping the hostname applied
              "hostname-nix" = {
                enable = true;
                target = "/etc/nixos/hostname.nix";
                template = builtins.writeFile "hostname-nix.tpl" "{ ... }: { networking.hostName = "{{ container.name }}"; }";
                # copy keeps the file updated when the container is changed
                when = [ "create" "copy" ];
              };
              # copy allow the user to specify a custom configuration.nix
              "configuration-nix" = {
                enable = true;
                target = "/etc/nixos/configuration.nix";
                template = builtins.writeFile "configuration-nix" "{{ config_get(\"user.user-data\", properties.default) }}";
                when = [ "create" ];
              };
            };
          '';
        };
      };
    };
  