$ git clone -n https://src.fedoraproject.org/rpms/libmfx.git /var/lib/mock/f29-build-7188-1771/root/thebuilddir/tmp/scmroot/libmfx
Cloning into '/var/lib/mock/f29-build-7188-1771/root/thebuilddir/tmp/scmroot/libmfx'...
$ git reset --hard b5928a7b2d92fc36a7b44452722ab1b2e338ad2c
HEAD is now at b5928a7 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild