$ git clone -n https://src.fedoraproject.org/rpms/ghc-IOSpec.git /var/lib/mock/f31-build-93421-32407/root/chroot_tmpdir/scmroot/ghc-IOSpec
Cloning into '/var/lib/mock/f31-build-93421-32407/root/chroot_tmpdir/scmroot/ghc-IOSpec'...
$ git reset --hard 18cf84355a56bc857d802076a51ee3aa6e294e27
HEAD is now at 18cf843 BR prof for lib and static for executable