$ git clone -n https://src.fedoraproject.org/rpms/ghc-data-default-class.git /var/lib/mock/f31-build-54257-27980/root/thebuilddir/tmp/scmroot/ghc-data-default-class
Cloning into '/var/lib/mock/f31-build-54257-27980/root/thebuilddir/tmp/scmroot/ghc-data-default-class'...
$ git reset --hard 6fdf9885020a1729f567a9e20c79382461ee7d37
HEAD is now at 6fdf988 refresh to cabal-rpm-0.13