$ git clone -n https://src.fedoraproject.org/rpms/bsf.git /var/lib/mock/f38-build-side-42-init-devel-566217-25898/root/chroot_tmpdir/scmroot/bsf
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-566217-25898/root/chroot_tmpdir/scmroot/bsf'...
$ git fetch origin a6b8906a705081c8d9b829b6b4cedb9239218779:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bsf
 * [new ref]         a6b8906a705081c8d9b829b6b4cedb9239218779 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a6b8906 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild