$ git clone -n https://src.fedoraproject.org/rpms/v4l2ucp.git /var/lib/mock/f31-build-70771-30537/root/thebuilddir/tmp/scmroot/v4l2ucp
Cloning into '/var/lib/mock/f31-build-70771-30537/root/thebuilddir/tmp/scmroot/v4l2ucp'...
$ git reset --hard 47d0cf968100b253d93a21a743f0efeacafac8eb
HEAD is now at 47d0cf9 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild