these 3 derivations will be built:
  /nix/store/3z1mgvh6hih54g3fg2q27xl6c0xbd0z9-home-manager-files.drv
  /nix/store/7wnj9gar94k2p0nkm0r0dkz8fvmzbhg7-hm-putter.json.drv
  /nix/store/p2rckj3li1rmyh13hjgqdk9zxd2brdh9-home-manager-generation.drv