these 3 derivations will be built:
  /nix/store/54sa7m5y1frapd9kxk1yv9lkmrqbijnm-home-manager-files.drv
  /nix/store/0j2v5ayxxmfvcabd98nvkmvr9r8yaz4q-hm-putter.json.drv
  /nix/store/2vhvvfdkck9sv1nnf57qk2aqsg73qw47-home-manager-generation.drv