$ git clone -n https://src.fedoraproject.org/rpms/ghc-mmorph.git /var/lib/mock/f31-build-54612-28022/root/thebuilddir/tmp/scmroot/ghc-mmorph
Cloning into '/var/lib/mock/f31-build-54612-28022/root/thebuilddir/tmp/scmroot/ghc-mmorph'...
$ git reset --hard b4a0c7997d70a894a88f1c508903968e1140d28e
HEAD is now at b4a0c79 refresh to cabal-rpm-0.13