$ git clone -n https://src.fedoraproject.org/rpms/ghc-mmap.git /var/lib/mock/f31-build-54611-28022/root/thebuilddir/tmp/scmroot/ghc-mmap
Cloning into '/var/lib/mock/f31-build-54611-28022/root/thebuilddir/tmp/scmroot/ghc-mmap'...
$ git reset --hard 2021b4ddd30fb6ff4c054e7a0f488c5225d0cfb1
HEAD is now at 2021b4d refresh to cabal-rpm-0.13