$ git clone -n https://src.fedoraproject.org/rpms/iperf.git /var/lib/mock/f41-build-side-1-3050256-37969/root/chroot_tmpdir/scmroot/iperf
Cloning into '/var/lib/mock/f41-build-side-1-3050256-37969/root/chroot_tmpdir/scmroot/iperf'...
$ git fetch origin 928197012927763dba846aef27d72baa5b316e40:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iperf
 * [new ref]         928197012927763dba846aef27d72baa5b316e40 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9281970 backport upstream patch to fix buffer overflow (BZ #2297736)