$ git clone -n https://src.fedoraproject.org/rpms/ghc-gitrev.git /var/lib/mock/f31-build-116465-34559/root/chroot_tmpdir/scmroot/ghc-gitrev
Cloning into '/var/lib/mock/f31-build-116465-34559/root/chroot_tmpdir/scmroot/ghc-gitrev'...
$ git reset --hard b4134f44b62fa79052cc55bada9259a525a52c1d
HEAD is now at b4134f4 BR prof for lib and static for executable