unpacking 'https://github.com/NixOS/nixpkgs/archive/a5cbcfe954791221bfffe2307f7d1a1bf61a871e.tar.gz' into the Git cache...
this derivation will be built:
  /nix/store/8q0ri4fwbd28rdyyw9yzzshfjm737f1k-bcachefs-module-6.18.42-1-lts.drv
this path will be fetched (213.37 MiB download, 593.51 MiB unpacked):
  /nix/store/41pxr5rbwjmgwrqq4kqvhj9mly7wj7w5-linux-6.18.41-dev
copying path '/nix/store/41pxr5rbwjmgwrqq4kqvhj9mly7wj7w5-linux-6.18.41-dev' from 'https://cache.nixos.org'...
building '/nix/store/8q0ri4fwbd28rdyyw9yzzshfjm737f1k-bcachefs-module-6.18.42-1-lts.drv'...