$ git clone -n https://src.fedoraproject.org/rpms/ghc-NumInstances.git /var/lib/mock/f31-build-93434-32407/root/chroot_tmpdir/scmroot/ghc-NumInstances
Cloning into '/var/lib/mock/f31-build-93434-32407/root/chroot_tmpdir/scmroot/ghc-NumInstances'...
$ git reset --hard 2f4f64f63e1fd0aae7840284bb3248d4df4aacb6
HEAD is now at 2f4f64f BR prof for lib and static for executable