unpacking 'https://github.com/NixOS/nixpkgs/archive/643809054d65fdd466a63e3155b8c498cb483c04.tar.gz' into the Git cache...
this derivation will be built:
  /nix/store/r4h5k3cv9zm4b440vm5sxjbb8svwf4kb-bcachefs-module-7.0.0-29-generic.drv
building '/nix/store/r4h5k3cv9zm4b440vm5sxjbb8svwf4kb-bcachefs-module-7.0.0-29-generic.drv'...