$ git clone -n https://src.fedoraproject.org/rpms/xeus-zmq.git /var/lib/mock/f41-build-side-1-2903094-34669/root/chroot_tmpdir/scmroot/xeus-zmq
Cloning into '/var/lib/mock/f41-build-side-1-2903094-34669/root/chroot_tmpdir/scmroot/xeus-zmq'...
$ git fetch origin c3cd314c1f11ca61af7c2e84e8770df1515d789b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xeus-zmq
 * [new ref]         c3cd314c1f11ca61af7c2e84e8770df1515d789b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c3cd314 Update to 3.1.0