$ git clone -n https://src.fedoraproject.org/rpms/R-waldo.git /var/lib/mock/f40-build-2094190-50353/root/chroot_tmpdir/scmroot/R-waldo
Cloning into '/var/lib/mock/f40-build-2094190-50353/root/chroot_tmpdir/scmroot/R-waldo'...
$ git fetch origin 285adff5d2a65c4d99e67adc465907080164625c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-waldo
 * [new ref]         285adff5d2a65c4d99e67adc465907080164625c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 285adff 0.5.2