$ git clone -n https://src.fedoraproject.org/rpms/clutter-gst3.git /var/lib/mock/f45-build-5510-340/root/chroot_tmpdir/scmroot/clutter-gst3
Cloning into '/var/lib/mock/f45-build-5510-340/root/chroot_tmpdir/scmroot/clutter-gst3'...
$ git fetch origin 3a6c0d42c01dc85ee69aa496c28d3f1cf2149068:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/clutter-gst3
 * [new ref]         3a6c0d42c01dc85ee69aa496c28d3f1cf2149068 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a6c0d4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild