$ git clone -n https://src.fedoraproject.org/rpms/R-timeSeries.git /var/lib/mock/f45-build-6466-348/root/chroot_tmpdir/scmroot/R-timeSeries
Cloning into '/var/lib/mock/f45-build-6466-348/root/chroot_tmpdir/scmroot/R-timeSeries'...
$ git fetch origin 83d3f9425b64fb063f17ee1e284f2094c2cb517a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-timeSeries
 * [new ref]         83d3f9425b64fb063f17ee1e284f2094c2cb517a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83d3f94 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild