$ git clone -n https://src.fedoraproject.org/rpms/postgresql-plruby.git /var/lib/mock/f31-build-88814-32012/root/chroot_tmpdir/scmroot/postgresql-plruby
Cloning into '/var/lib/mock/f31-build-88814-32012/root/chroot_tmpdir/scmroot/postgresql-plruby'...
$ git reset --hard 4c85639f17f8c9194007518df917501c663bc778
HEAD is now at 4c85639 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild