these 3 derivations will be built:
  /nix/store/kf7f3gs9b27s9kz7sm8s5sgz4yy9va2s-pi-src-with-lock.drv
  /nix/store/3z32h7yxjgd49l19jgz4ig3smgg28qhf-pi-1.0.0.drv
  /nix/store/8nnl5xbmcifs2l4dpdbjn1f2mpmi2y40-check-pi.drv