$ git clone -n https://src.fedoraproject.org/rpms/ghc-Only.git /var/lib/mock/f31-build-115615-34504/root/chroot_tmpdir/scmroot/ghc-Only
Cloning into '/var/lib/mock/f31-build-115615-34504/root/chroot_tmpdir/scmroot/ghc-Only'...
$ git reset --hard ace239599fd928b5ca9d062139f7adf88e96c717
HEAD is now at ace2395 BR prof for lib and static for executable