$ git clone -n https://src.fedoraproject.org/rpms/ghc-nanospec.git /var/lib/mock/f40-build-776127-128641/root/chroot_tmpdir/scmroot/ghc-nanospec
Cloning into '/var/lib/mock/f40-build-776127-128641/root/chroot_tmpdir/scmroot/ghc-nanospec'...
$ git fetch origin c8225efd1d5d503585fe6bcfcb08e2cb9188e435:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-nanospec
 * [new ref]         c8225efd1d5d503585fe6bcfcb08e2cb9188e435 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8225ef Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild