these 3 derivations will be built:
  /nix/store/15cn601yaf577mi1rlri6nx7kaymsh1m-home-manager-files.drv
  /nix/store/51s4cfgz5zkkya85gskl9csrz9lg5a31-hm-putter.json.drv
  /nix/store/yx9c5bj2446252xi73637z15r6b7bjka-home-manager-generation.drv