$ git clone -n https://git.cclinux.org/stage/rpms/iperf3.git /var/lib/mock/dist-circle9_5-updates-build-126298-90109/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/dist-circle9_5-updates-build-126298-90109/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin 7df74514e1f148caa8c0c51828ad027b511954c7:KOJI_FETCH_HEAD
From https://git.cclinux.org/stage/rpms/iperf3
 * [new ref]         7df74514e1f148caa8c0c51828ad027b511954c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7df7451 import iperf3-3.9-13.el9_5.1