$ git clone -n https://src.fedoraproject.org/rpms/ghc-ghc-mtl.git /var/lib/mock/f31-build-111612-34187/root/chroot_tmpdir/scmroot/ghc-ghc-mtl
Cloning into '/var/lib/mock/f31-build-111612-34187/root/chroot_tmpdir/scmroot/ghc-ghc-mtl'...
$ git reset --hard 39600c41a12670a2d46270e57d7169535840baa6
HEAD is now at 39600c4 BR prof for lib and static for executable