unpacking 'https://github.com/NixOS/nixpkgs/archive/dc5d91f840324650bac8c379428c7037a416959a.tar.gz' into the Git cache...
this derivation will be built:
  /nix/store/pj5ndnp1ww1wq17iac6mzjvj2iacnjf4-bcachefs-module-7.0.0-38-generic.drv
building '/nix/store/pj5ndnp1ww1wq17iac6mzjvj2iacnjf4-bcachefs-module-7.0.0-38-generic.drv'...