$ git clone -n https://src.fedoraproject.org/rpms/ksystemstats.git /var/lib/mock/f41-build-side-1-2956310-35552/root/chroot_tmpdir/scmroot/ksystemstats
Cloning into '/var/lib/mock/f41-build-side-1-2956310-35552/root/chroot_tmpdir/scmroot/ksystemstats'...
$ git fetch origin 4c5c839c85864370d082a0262e4448713f5232e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ksystemstats
 * [new ref]         4c5c839c85864370d082a0262e4448713f5232e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c5c839 6.2.0