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Re: How to notice when my change breaks something

From: Björn Höfling
Subject: Re: How to notice when my change breaks something
Date: Sun, 18 Feb 2018 22:04:27 +0100

Hi Mark,

On Sun, 11 Feb 2018 17:35:43 -0500
Mark H Weaver <address@hidden> wrote:

> Hi Chris,
> Chris Marusich <address@hidden> writes:
> > How do you notice when a change breaks something else?  You so
> > frequently notice these things, it almost seems like you're
> > omniscient!
> >
> > Do you have an automated mechanism for doing this, or are you
> > manually checking things frequently?  
> I regularly check Hydra for newly failed packages.  To see the most
> recent evaluations, visit <>.  Each
> evaluation corresponds to a commit of Guix's git repo.  You can
> compare two evaluations with URLs of the form
> <>, which will compare
> evaluation 109907 to the previous evaluation 109906.  It is also often
> useful to compare to a slightly older evaluation, especially one with
> an unusually low number of failures, e.g.
> <> where 109896 was
> the most recent evaluation of 'master' with fewer than 1900 failures.
> Note that is not sufficiently powerful for the work it
> is currently doing, so it often takes on the order of several
> *minutes* for the above URLs to load, and sometimes the Nginx
> front-end will time-out before that happens.  Our new build farm is
> vastly more powerful, but its web interface is currently quite
> rudimentary and not yet sufficient for the kind of monitoring I do on
> Hydra.
> Hope this helps.
>        Mark

Yes, that definitely helped me too.

I have a follow-up question: This day I realized that teeworlds broke
on core-updates due to a freetype update (see

Now I thought: Is it possible to download the whole list of
(directly) breaking packages from Hydra? If so, I could fold-packages
through them and filter out those that also have freetype as a
dependency and probably fix them with a one-liner. Is there any
download/API functionality for Hydra?


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