$ git clone -n https://src.fedoraproject.org/rpms/clutter-gtk.git /var/lib/mock/f45-build-4219-331/root/chroot_tmpdir/scmroot/clutter-gtk
Cloning into '/var/lib/mock/f45-build-4219-331/root/chroot_tmpdir/scmroot/clutter-gtk'...
$ git fetch origin 8f87ce8a5d2c12a660e6394e1561a357cc68ea9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/clutter-gtk
 * [new ref]         8f87ce8a5d2c12a660e6394e1561a357cc68ea9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f87ce8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild