Tycho and pre-p2 update sites

(from "Simplifying The p2 Process, Part 3: Associate Sites")

Even as p2 has taken over the world domination when it comes to Eclipse update sites, you can still find old-style update site around. This really doesn't matter as long as you want to install features in Eclipse itself - it just takes longer, as all features of the update site is downloaded - but if you want to use these old-style update sites in a Tycho build, then you have a problem as Tycho only support p2 based repositories, not the old-style update sites.

During the development the next version of our AGETOR product, we recently had this exact problem with the Elver update site, which contains the needed plug-ins if you want to work with Teneo. In this post, I'll try to describe how you can solve the problem, and likely also get a faster and more stable module resolution with your Tycho build.