$ git clone -n https://src.fedoraproject.org/rpms/ursa-major /var/lib/mock/f41-build-side-1-3137732-39796/root/chroot_tmpdir/scmroot/ursa-major
Cloning into '/var/lib/mock/f41-build-side-1-3137732-39796/root/chroot_tmpdir/scmroot/ursa-major'...
$ git fetch origin 36bf72856c92f8feca2f0bce44317ef14fb517a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ursa-major
 * [new ref]         36bf72856c92f8feca2f0bce44317ef14fb517a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 36bf728 Bump release - 0.5.1-2