$ git clone -n https://src.fedoraproject.org/rpms/ghc-Only.git /var/lib/mock/f31-build-53936-27924/root/thebuilddir/tmp/scmroot/ghc-Only
Cloning into '/var/lib/mock/f31-build-53936-27924/root/thebuilddir/tmp/scmroot/ghc-Only'...
$ git reset --hard 88b4f9355029f9422f454ba7da2e3463c8fbb3b2
HEAD is now at 88b4f93 refresh to cabal-rpm-0.13