$ git clone -n https://src.fedoraproject.org/rpms/iperf3.git /var/lib/mock/f40-build-2600259-63100/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/f40-build-2600259-63100/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin 38037e9f02c5b1647d23200d76f09618b91d52f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iperf3
 * [new ref]         38037e9f02c5b1647d23200d76f09618b91d52f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 38037e9 Migrate to SPDX license