$ git clone -n https://src.fedoraproject.org/rpms/ghc-math-functions.git /var/lib/mock/f31-build-54600-28018/root/thebuilddir/tmp/scmroot/ghc-math-functions
Cloning into '/var/lib/mock/f31-build-54600-28018/root/thebuilddir/tmp/scmroot/ghc-math-functions'...
$ git reset --hard 618f097e73f092cb715a293a70a98278dd687d26
HEAD is now at 618f097 refresh to cabal-rpm-0.13