$ git clone -n https://src.fedoraproject.org/rpms/R-gee.git /var/lib/mock/f42-build-3264658-41245/root/chroot_tmpdir/scmroot/R-gee
Cloning into '/var/lib/mock/f42-build-3264658-41245/root/chroot_tmpdir/scmroot/R-gee'...
$ git fetch origin 9ed401ee5628e60405be588db6d5abce2e49f72c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-gee
 * [new ref]         9ed401ee5628e60405be588db6d5abce2e49f72c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ed401e Update to latest version