these 3 derivations will be built:
  /nix/store/fchahvi1qa2h78yp5pq07g4kjg891pj0-home-manager-files.drv
  /nix/store/y9c71g7gzx57z3v5fnklv5lrhj8xp7ha-hm-putter.json.drv
  /nix/store/ix5iqaq794b2s9wmlmsq6xv3h047af7q-home-manager-generation.drv