these 3 derivations will be built:
  /nix/store/xxfpngdxnacjm1i576vy8z247mmz7i23-home-manager-files.drv
  /nix/store/4rrglbbh8b1avbaa6qsdr93nnjsq4nbs-hm-putter.json.drv
  /nix/store/p6dfcw5d7qgzxiymvmkz2v1fj1fp9vbj-home-manager-generation.drv