Runs lsb_release on the upstream distribution

ubuntu_lsb_release.sh

#!/bin/bash

#for example "ubuntu_lsb_release -c -s" gives the ubuntu codename such as xenial or trusty

if [ ! -f /etc/upstream-release/lsb-release ]
then
    # this is already ubuntu, delegate
    /usr/bin/lsb_release $@
    exit 0
fi

sudo mv /etc/lsb-release /etc/lsb-release.bak
sudo cp /etc/upstream-release/lsb-release /etc/lsb-release

/usr/bin/lsb_release $@

sudo mv /etc/lsb-release.bak /etc/lsb-release