nixos/global/fs/ext4.nix

{
  lib,
  config,
  ...
}:
with lib;
let
  cfg = config.global.fs;
in
mkIf (cfg.type == "ext4") {
  fileSystems."/nix" = {
    device = "/dev/disk/by-uuid/${cfg.store}";
    fsType = "ext4";
    options = [ "noatime" ];
  };
}