$ git clone -n https://src.fedoraproject.org/rpms/libvncserver.git /var/lib/mock/f45-build-17228-497/root/chroot_tmpdir/scmroot/libvncserver
Cloning into '/var/lib/mock/f45-build-17228-497/root/chroot_tmpdir/scmroot/libvncserver'...
$ git fetch origin bee80f03c3bd74d0a0df15e0feb501d54f935b35:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libvncserver
 * [new ref]         bee80f03c3bd74d0a0df15e0feb501d54f935b35 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bee80f0 Rebuilt for FFmpeg 9