$ git clone -n https://src.fedoraproject.org/rpms/Carla.git /var/lib/mock/f41-build-side-1-2749557-31004/root/chroot_tmpdir/scmroot/Carla
Cloning into '/var/lib/mock/f41-build-side-1-2749557-31004/root/chroot_tmpdir/scmroot/Carla'...
$ git fetch origin 5b071c22dc6d5471d3f62f0763b9d48605426db6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/Carla
 * [new ref]         5b071c22dc6d5471d3f62f0763b9d48605426db6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b071c2 Backport PR #1933 to support pyliblo3 for F41+