$ git clone -n https://src.fedoraproject.org/rpms/iperf3.git /var/lib/mock/f40-build-797822-141532/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/f40-build-797822-141532/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin 874f38dab0d79ea6bd6a08a796a5d4304bbf14ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iperf3
 * [new ref]         874f38dab0d79ea6bd6a08a796a5d4304bbf14ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 874f38d Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild