$ git clone -n https://src.fedoraproject.org/rpms/ghc-SHA.git /var/lib/mock/f31-build-93450-32407/root/chroot_tmpdir/scmroot/ghc-SHA
Cloning into '/var/lib/mock/f31-build-93450-32407/root/chroot_tmpdir/scmroot/ghc-SHA'...
$ git reset --hard 23173d5db45563d8e79f167b7027d8d144383ca3
HEAD is now at 23173d5 BR prof for lib and static for executable