$ git clone -n https://src.fedoraproject.org/rpms/freeradius.git /var/lib/mock/f41-build-1208205-22498/root/chroot_tmpdir/scmroot/freeradius
Cloning into '/var/lib/mock/f41-build-1208205-22498/root/chroot_tmpdir/scmroot/freeradius'...
$ git fetch origin 005987d712cb48eff67c75886b69d27f2e3b54c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/freeradius
 * [new ref]         005987d712cb48eff67c75886b69d27f2e3b54c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 005987d Generate certificates in auth test