$ git clone -n https://src.fedoraproject.org/rpms/radius-engine.git /var/lib/mock/f41-build-700859-12894/root/chroot_tmpdir/scmroot/radius-engine
Cloning into '/var/lib/mock/f41-build-700859-12894/root/chroot_tmpdir/scmroot/radius-engine'...
$ git fetch origin 6837fe3845688dd33eecb70a9cf17a8883b17751:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/radius-engine
 * [new ref]         6837fe3845688dd33eecb70a9cf17a8883b17751 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6837fe3 Eliminate use of obsolete %patchN syntax (#2283636)