$ git clone -n https://src.fedoraproject.org/rpms/clutter-gst3.git /var/lib/mock/f39-build-1531135-36206/root/chroot_tmpdir/scmroot/clutter-gst3
Cloning into '/var/lib/mock/f39-build-1531135-36206/root/chroot_tmpdir/scmroot/clutter-gst3'...
$ git fetch origin b99efa6953188a586fe5cc5f1a6135526285d4d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/clutter-gst3
 * [new ref]         b99efa6953188a586fe5cc5f1a6135526285d4d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b99efa6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild