$ git clone -n https://src.fedoraproject.org/rpms/ghc-Stream.git /var/lib/mock/f31-build-93441-32407/root/chroot_tmpdir/scmroot/ghc-Stream
Cloning into '/var/lib/mock/f31-build-93441-32407/root/chroot_tmpdir/scmroot/ghc-Stream'...
$ git reset --hard 788ec6c4ab8c0e80f41a8588089bd0fe3730ca7d
HEAD is now at 788ec6c BR prof for lib and static for executable