$ git clone -n https://src.fedoraproject.org/rpms/ghc-stm-chans.git /var/lib/mock/f31-build-54840-28065/root/chroot_tmpdir/scmroot/ghc-stm-chans
Cloning into '/var/lib/mock/f31-build-54840-28065/root/chroot_tmpdir/scmroot/ghc-stm-chans'...
$ git reset --hard 3931d9af97cb3e37cc590ab64afc416a67048ef1
HEAD is now at 3931d9a refresh to cabal-rpm-0.13