$ git clone -n https://src.fedoraproject.org/rpms/apache-commons-net.git /var/lib/mock/f40-build-2184674-51282/root/chroot_tmpdir/scmroot/apache-commons-net
Cloning into '/var/lib/mock/f40-build-2184674-51282/root/chroot_tmpdir/scmroot/apache-commons-net'...
$ git fetch origin c3a55733eb37eb190c518240b56a32e6afeade37:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/apache-commons-net
 * [new ref]         c3a55733eb37eb190c518240b56a32e6afeade37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c3a5573 Update to upstream version 3.10.0