$ git clone -n https://src.fedoraproject.org/rpms/ghc-erf.git /var/lib/mock/f31-build-116331-34549/root/chroot_tmpdir/scmroot/ghc-erf
Cloning into '/var/lib/mock/f31-build-116331-34549/root/chroot_tmpdir/scmroot/ghc-erf'...
$ git reset --hard 87c27eb67580884a92b2a38a7ba31ce16ebc3b35
HEAD is now at 87c27eb BR prof for lib and static for executable