unpacking 'https://github.com/NixOS/nixpkgs/archive/c59305bab2065cfecc4944690d9eedbb56f3a9fa.tar.gz' into the Git cache...
this derivation will be built:
  /nix/store/rand19bl8mx3ab2c641sr4qv7bm94diz-bcachefs-module-7.0.0-39-generic.drv
building '/nix/store/rand19bl8mx3ab2c641sr4qv7bm94diz-bcachefs-module-7.0.0-39-generic.drv'...