$ git clone -n https://src.fedoraproject.org/rpms/rxtx.git /var/lib/mock/f31-build-66198-29839/root/chroot_tmpdir/scmroot/rxtx
Cloning into '/var/lib/mock/f31-build-66198-29839/root/chroot_tmpdir/scmroot/rxtx'...
$ git reset --hard af8c14705cc1b2341388bb5ff88b8fbbd3a9f71d
HEAD is now at af8c147 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild