nixos/virtualisation: add contents setting to googleComputeImage

        GZIP compression level of the resulting disk image (1-9).

      '';

    };

    virtualisation.googleComputeImage.contents = mkOption {

      type = with types; listOf attrs;

      default = [ ];

      description = ''

        The files and directories to be placed in the image.

        This is a list of attribute sets {source, target, mode, user, group} where

        `source' is the file system object (regular file or directory) to be

        grafted in the file system at path `target', `mode' is a string containing

        the permissions that will be set (ex. "755"), `user' and `group' are the

        user and group name that will be set as owner of the files.

        `mode', `user', and `group' are optional.

        When setting one of `user' or `group', the other needs to be set too.

      '';

      example = literalExpression ''

        [

          {

            source = ./default.nix;

            target = "/etc/nixos/default.nix";

            mode = "0644";

            user = "root";

            group = "root";

          }

        ];

      '';

    };

    virtualisation.googleComputeImage.efi = mkEnableOption "EFI booting";

  };

      '';

      format = "raw";

      configFile = if cfg.configFile == null then defaultConfigFile else cfg.configFile;

      inherit (cfg) contents;

      partitionTableType = if cfg.efi then "efi" else "legacy";

      inherit (config.virtualisation) diskSize;

      inherit config lib pkgs;