$ git clone -n https://src.fedoraproject.org/rpms/rats.git /var/lib/mock/f41-build-side-1-2965993-35798/root/chroot_tmpdir/scmroot/rats
Cloning into '/var/lib/mock/f41-build-side-1-2965993-35798/root/chroot_tmpdir/scmroot/rats'...
$ git fetch origin b17d33497c72a1f691ac0c2a16aac45430b51a7c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rats
 * [new ref]         b17d33497c72a1f691ac0c2a16aac45430b51a7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b17d334 convert GPLv2 license to SPDX