$ git clone -n https://src.fedoraproject.org/rpms/iperf.git /var/lib/mock/f40-build-2600237-63098/root/chroot_tmpdir/scmroot/iperf
Cloning into '/var/lib/mock/f40-build-2600237-63098/root/chroot_tmpdir/scmroot/iperf'...
$ git fetch origin 4d89725987c4e24603cedd23949b41c05e7cf019:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iperf
 * [new ref]         4d89725987c4e24603cedd23949b41c05e7cf019 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4d89725 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild