[Nix-dev] Hydra Building PRs

[Bas van Dijk]

This is just great work!

I'm also very excited about the work on ARM.

I do see one of my PRs failing to evaluate though:

  https://prs.nix.gsc.io/jobset/nixos/pr-22121#tabs-errors

Any idea what is going wrong?

Bas

On 28 January 2017 at 14:20, Graham Christensen <graham at grahamc.com> wrote:

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> Hash: SHA256
>
> Hello everyone,
>
> A couple weeks ago I created https://prs.nix.gsc.io/, a Hydra server
> which builds every PR. Every PR will exist at
> https://prs.nix.gsc.io/jobset/nixos/pr-PRNUMBER.
>
> It features:
>  - a web-hook, which means:
>  - the moment a PR is created, the jobset is created on this hydra
>  - every time a PR is updated, the jobset is triggered
>  - every time there is a commit to master, the master jobset is
>    triggered
>
> Non-feature:
>  - I haven't published the public key to the binary cache, because that
>    would be very expensive for me to pay for. I am personally paying for
>    the binary cache storage. Please don't use the binary cache results.
>
> The entire system is open source, publicly available at
> https://github.com/grahamc/hydra-prs/.
>
> HOW
> - --------
>
> The build infrastructure is _very_ generously donated by Packet.net, who
> lease dedicated bare metal servers by the hour. Right now we have about
> 250 cores across 30 servers.
>
> This is still a trial run, though, so the number of systems we get can
> and will change.
>
> In exchange for this hardware, I've been working to add NixOS support to
> their platform. I'm also wanting to make NixOps have built-in support
> for deploying to their hardware.
>
> FUTURE (SOON)
> - --------
>
> Packet.net is also one of the only hosting companies I know of which
> rents Cavium ThunderX ARMv8s, and they're very interested in our
> supporting this architecture. Soon, with the help of Dezgeg,
> prs.nix.gsc.io will also building PRs against ARMv8.
>
> After that works, I've spoken with Rob, and it sounds like
> hydra.nixos.org will gain the ability to run ARMv8 builds, too.
>
> FUTURE (LONGER TERM)
> - --------
>
> Ideally, I think everyone would like this to become part of
> hydra.nixos.org, Eelco included.
>
> The current state of the system has a couple of patches to Hydra, plus a
> PHP webserver calling CLI utilities to create and trigger jobsets.
> Having this integrated with hydra properly would be way more ideal.
>
> Interpreting the results is a bit of a open question. Sometimes a PR
> will cause unrelated packages to start passing or failing, which is very
> mysterious. This seems less bad than Travis (which fails with any PR
> bigger than a light breeze...) but will still be confusing for people
> who aren't deeply familiar with Hydra.
>
> Other interesting things we may want to implement is setting build
> statuses on GitHub.com, or a bot that posts comments.
>
> I would be very, very happy if people contributed and improved the
> system.
>
> - --
>
> Thank you,
> Graham Christensen
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