$ git clone -n https://src.fedoraproject.org/rpms/lxsession.git /var/lib/mock/f41-build-side-1-2658241-28541/root/chroot_tmpdir/scmroot/lxsession
Cloning into '/var/lib/mock/f41-build-side-1-2658241-28541/root/chroot_tmpdir/scmroot/lxsession'...
$ git fetch origin 18e8a1e5ab1ed8a1f2641493fa2cd5307a83b6fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lxsession
 * [new ref]         18e8a1e5ab1ed8a1f2641493fa2cd5307a83b6fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18e8a1e Update to the latest git