these 3 derivations will be built:
  /nix/store/bwikm48qa1yhbxcrrnbylv8n36kh2xhp-home-manager-files.drv
  /nix/store/v8kg2hdm4whl2hixyw6yhm3p5zljp36a-hm-putter.json.drv
  /nix/store/26x43mbxkbbrsd2xhjqmx2d3fl3i0a2f-home-manager-generation.drv