test.nix

{ nixpkgs ? <nixpkgs>, system ? "aarch64-linux" } :
#                                         ^ (1) changed to aarch64-linux
let
  myisoconfig = { pkgs, ...}: {
    imports = [
      "${nixpkgs}/nixos/modules/installer/cd-dvd/sd-image-aarch64.nix"
    ];

    boot = {
#    ^ (2) fixed the options `boot.*` namespacing issue
      kernelParams = [ "cma=32M" ];
      supportedFilesystems = [ "f2fs" ];
    };

    environment.systemPackages = with pkgs; [ vim ];

    users.extraUsers.root = {
      packages = with pkgs; [ f2fs-tools lynx vim w3m ];
      initialPassword = "nixos";
    };

    fileSystems = {
      "/boot" = {
        device = "/dev/disk/by-label/NIXOS_BOOT";
        fsType = "vfat";
      };
      "/" = {
        device = "/dev/disk/by-label/NIXOS_SD";
        fsType = "f2fs";
      };
    };

  };

  evalNixos = configuration: import "${nixpkgs}/nixos" {
    inherit system configuration;
  };

in { sd = (evalNixos myisoconfig).config.system.build.sdImage; }
#    ^ (3) (uselessly) renamed to sd                     ^
#                                                        ^ (4) use sdImage here