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Posts Tagged ‘DEX

DEX finishes first batch of derivative patches for Debian

It’s been a few months since Zack and I announced the DEX project, which aims to improve the Debian ecosystem by working jointly with derivative distributions.

Our first milestone

The goal of our first project, nicknamed ancient-patches, was to clear out an old batch of a few hundred Ubuntu patches whose status was unclear. We couldn’t tell which ones had been merged into Debian, which were waiting in the BTS, and which had yet to be submitted to Debian. All of them were several years old.

I’m pleased to announce that this project is now complete. Thanks to help from David Paleino, Colin Watson, Nathan Handler and Steve Langasek, we were able to clear over 95% of the patches in a matter of days. These were the easy ones: patches which were obsolete, or had already been applied. We discussed the remainder, and resolved all of the patches whose status was still unclear. This left the harder ones: patches stalled in the BTS, and patches where there was no consensus about what to do with them.

One of the stalled patches was merged into Debian via an NMU, eliminating the delta between Debian and Ubuntu. Another had been submitted to Debian by a third party, but was no longer shipping in Ubuntu, so we considered it obsolete for purposes of this project.

This has left only two patches out of the original list of 277. Both of them are filed in the BTS and have been discussed with the relevant maintainer team. One of them is expected to be obsoleted when a new upstream version is packaged, which implements similar functionality. The other is being discussed with the upstream developers, but there is no conclusion yet about whether it can be merged upstream or in Debian.


Although we weren’t quite able to clear the whole list, we still consider the project to be a success because:

  • We ensured that all of the patches received due consideration for inclusion in Debian
  • We proved the concept of DEX, with developers from Debian and derivatives cooperating on a common goal and sharing tools
  • Most importantly, we learned from the experience

What’s next

In the most recent DEX update on debian-derivatives, I highlighted a few important events for DEX:

  • Our second major project, nicknamed “big-merges”, will begin soon. Our goal is to identify the few packages which are most diverged between Debian and Ubuntu, and work to get them as close to identical as possible. If you have suggestions for packages to focus on, let us know!
  • Allison Randal is beginning a DEX project to implement the Python 2.7 transition across Debian and Ubuntu
  • Nathan Handler is working on a Summer of Code project to develop specialized tools to help with this kind of cross-distribution teamwork
  • Zack is organizing a derivatives BoF at DebConf 11

We’re looking forward to seeing DEX develop further. If you’d like to get involved, come and join us on the debian-derivatives mailing list or IRC (#debian-derivatives on freenodeOFTC).

Matt Zimmerman and Stefano Zacchiroli

Written by Matt Zimmerman

June 8, 2011 at 14:21

DEX: Debian and its derivatives, getting things done together

Since I resumed active status in Debian, I’ve been thinking about how to bridge the gap between Debian and its derivatives*. I’ve spoken at length with Zack, the attendees of the Derivatives BoF at DebConf 10, and the fine folks at the Derivatives Front Desk about the technical and social issues affecting derivative projects, and could probably write a very thorough series of blog posts on the subject.

Instead, Zack and I decided to try doing something about it: we have begun a project to test out a new approach to the problem.

Introducing DEX

DEX is all about action: merging patches, fixing bugs, crunching data, whatever is necessary to get changes from derivatives into Debian proper. DEX doesn’t try to change the way any existing project works, but adds a “fast path” for getting code from one place to another.

DEX is a joint task force where developers from Debian and its derivatives work together on this common goal. As a pilot project, we’ve established an Ubuntu DEX Team focused on merging code from Ubuntu into Debian. With members from both projects, we hope to be able to resolve blockage anywhere in the pipeline. Whatever needs to get done in order to merge an Ubuntu patch, someone in the Ubuntu DEX team will know what to do. If we get good results with Ubuntu, we hope that other derivatives will follow. With thanks to David Paleino, we’re excited that the Utnubu project is merging into DEX as it aligns well with their goals. I’m very grateful to have Colin Watson and James Westby signed up to contribute as well.

Our first project is simple: turn this list green. This is an archive of quite old patches from Ubuntu, most of which have probably been merged already or made obsolete, but they pre-date any kind of tracking system so they need to be verified. Once that’s done, we’ll move on to a new project with a new todo list.

If you want to see Debian benefit from technical work done in derivatives, DEX is a chance for you to act together to make it happen. If you work on a derivative and want to carry a smaller delta, come and join us. I’m sure we’ll learn a lot from this experience.

* There are many instances of great cooperation between Debian and derivative distributions, including joint package maintenance teams, and some derivatives are even part of the Debian project. Nonetheless, there are areas were most people I’ve spoken to agree that we need to do better. This is what I’ve referred to as the “gap”.

Written by Matt Zimmerman

March 16, 2011 at 21:30