machine_setup/nix/configuration/formats/iso.nix

{
  lib,
  modulesPath,
  ...
}:

{
  imports = [
    (modulesPath + "/installer/cd-dvd/iso-image.nix")
  ];

  config = {
    isoImage.makeEfiBootable = true;
    isoImage.makeUsbBootable = true;

    me.buildingPortable = true;
    me.mountPersistence = lib.mkForce false;
    me.optimizations.enable = lib.mkForce false;

    # Not doing image_based_appliance because this might be an install ISO, in which case we'd need nix to do the install.
    # me.image_based_appliance.enable = true;
  };
}