$ git clone -n https://src.fedoraproject.org/rpms/chrony.git /var/lib/mock/f40-build-2235008-53414/root/chroot_tmpdir/scmroot/chrony
Cloning into '/var/lib/mock/f40-build-2235008-53414/root/chroot_tmpdir/scmroot/chrony'...
$ git fetch origin 396d15c284b65cc88840488e2b72ca4696159ed8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chrony
 * [new ref]         396d15c284b65cc88840488e2b72ca4696159ed8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 396d15c update clknetsim source