unpacking 'https://github.com/NixOS/nixpkgs/archive/f665af0cdb70ed27e1bd8f9fdfecaf451260fc55.tar.gz' into the Git cache...
this derivation will be built:
  /nix/store/yan2vp1n0qs86sb7jjiiq6ydrm7a153b-bcachefs-module-7.0.0-26-generic.drv
building '/nix/store/yan2vp1n0qs86sb7jjiiq6ydrm7a153b-bcachefs-module-7.0.0-26-generic.drv'...