Comment 2 for bug 198978

We can't do it exactly right, because our references are based on tarballs from Ubuntu packages (or sometimes even on upstream tarballs), but we can approximate. Basically, parameters we have for Ubuntu packages are (distro, distroseries, sourcepackage, path, line number), and for products (product, productseries, path, line number), and if code hosting can provide us with a method to get links based on that, we'd be happy to linkify the references. Note how we _don't_ have the actual revision or release number for the sourcepackage, so everything would be just a guess.