[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Reproducible Build Summit
Reproducible Build Summit
Fri, 04 Dec 2015 20:54:57 +0100
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)
Manolis and I had the pleasure to attend the first “Reproducible Build
Summit” this week, wonderfully well organized by Debian hackers Lunar
and Holger, along with other brilliant people, and with the support of
the Linux Foundation, the Open Technology Fund, and Google.
There were around 40 people, including contributors to a variety of free
operating systems and distros, which led to many very insightful
sessions and discussions.
Here are the highlights of the sessions I attended and discussions I
had, off the top of my head; Manolis can complement it:
* Guix & Nix session
Eelco Dolstra of Nix and myself held a “geek dating” session where we
presented Nix/Guix to everyone by groups of 8 people. That was a fun
exercise, but also difficult to do without any demo/slides.
I was glad to learn that Lamby, a Debian developer, had come up with
<https://github.com/lamby/apt-challenge>. :-) A later session was
dedicated to specifying a tool similar to ‘guix challenge’ and dubbed
* Shared reproducibility issue database
Currently we have a bunch of patches and open reproducibility issues
at <http://bugs.gnu.org/guix>, but they feel lonely! The Debian
folks have a Yaml database (recutils would be nice, but hey!) that is
used to generate the pages at <https://reproducible.debian.org/>.
They are kindly offering to open it to other distros, so that we can
all work together instead of duplicating work. Expect updates on the
practical details soonish.
* Distro bootstrapping
We had a short session on distro bootstrapping, where we discussed
how each project addresses it, and what we could do to improve the
situation. Most distros, including Debian, do not have a clearly
specified set of bootstrap binaries like we have, but are willing to
work towards having a more formal set of requirements, to allow the
distro to be bootstrapped in different contexts. There were
discussions about diverse double compilation and whether/how it could
help, as well as how we could reduce the bootstrap set (I suggested
something like keeping TinyC, not GCC, as a bootstrap binary, used to
build GCC 4.6-, used to build a more recent GCC that requires C++.)
* Hacking sessions
Eelco, Manolis, and I sat together for the hacking sessions. I
focused on shamelessly stealing the Nix daemon’s ability to rebuild a
derivation and error out if the result differs (commits 07e70f4 and
I also discussed with Eelco the fact that the daemon was leaking the
real name of the build directory, meaning that if a build machine
and the other runs:
then the first build process will see a directory called
/foo/bar/nix-build-xxx. If it captures the build directory name,
then we get a discrepancy. Eelco quickly changed that, such that the
build process always sees /tmp/nix-build-xxx:
I’ll merge this commit soon.
Of course the better fix is for packages to not capture the build
directory name, and even to error out when that happens. But that
seems like a longer-term goal, potentially can-of-wormy (think of
Besides, I packaged ‘findnewest’ (commit df7393b) by Thomas Klausner
of NetBSD minutes after he had tagged it. ;-) This tool is meant to
help provide useful *and* reproducible timestamps for packages that
* Testing Guix reproducibility
Holger of Debian said he would be happy to perform independent builds
of Guix packages on the ProfitBricks-sponsored machines that are used
for Debian and other distros. Manolis will discuss with him to get
that up and running.
* Authenticating code from a Git repo
The Qubes people have a sophisticated process to sign their code in
Git. Since they want signatures from both the author and the
reviewers of a given patch series, they use signed tags (signed
commits can only have one signature.) Thus they end up automatically
creating signed tags for each series of patches that is pushed (a bit
heavyweight, but it does the job.)
I’d like to suggest that we do something similar.
I think that’s a lot of food for thought already! There’ll be other
such meetings in the future, so I hope we can keep making progress
together. I would also like to get the broader GNU involved in
addressing the issue.
Anyway, that was a great experience, with lots of friendly people to
chat with and have a walk in Athens by night!
Description: PGP signature
- Reproducible Build Summit,
Ludovic Courtès <=