unpacking 'https://github.com/NixOS/nixpkgs/archive/ec2d622de0773551768cf98f3fc50cbcc003b9c5.tar.gz' into the Git cache...
this derivation will be built:
  /nix/store/5aaamkyvwl6nznb8kq2acnsgzdkahx3k-bcachefs-module-7.0.0-30-generic.drv
building '/nix/store/5aaamkyvwl6nznb8kq2acnsgzdkahx3k-bcachefs-module-7.0.0-30-generic.drv'...