unpacking 'https://github.com/NixOS/nixpkgs/archive/f665af0cdb70ed27e1bd8f9fdfecaf451260fc55.tar.gz' into the Git cache...
this derivation will be built:
  /nix/store/cnjbr9qv6dd95rwga6dh7j4myc77wsyv-bcachefs-module-7.0.0-31-generic.drv
building '/nix/store/cnjbr9qv6dd95rwga6dh7j4myc77wsyv-bcachefs-module-7.0.0-31-generic.drv'...