From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@gnu.org>
Subject: Re: [PATCH] Support returning build information by output.
Date: Wed, 08 Jan 2020 22:21:51 +0100
Message-ID: <87blrdej9s.fsf@gnu.org>
References: <20200104095148.3522-1-mail@cbaines.net>
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In-Reply-To: <20200104095148.3522-1-mail@cbaines.net> (Christopher Baines's
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To: Christopher Baines <mail@cbaines.net>
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Hi,

Christopher Baines <mail@cbaines.net> skribis:

> Being able to take a derivation and query the build information is useful=
, but
> in cases where there are multiple derivations that produce the same outpu=
ts,
> the probability of getting the data back from Cuirass is reduced.
>
> This is because Cuirass might not have build the exact derivation you hav=
e,
> but a different derivation that produces the same outputs (this can commo=
nly
> happen when a related fixed output derivation changes).
>
> Cuirass doesn't store derivations if they produce the same outputs as a
> derivation it already knows about, so it can't determine if this is the
> case. Therefore, provide a way of querying build results by output, rather
> than derivation.
>
> The motivation behind this is to make it easier to import build informati=
on in
> to the Guix Data Service.
>
> * src/cuirass/database.scm (db-get-output): New procedure.
> * src/cuirass/http.scm (respond-output-not-found): New procedure.
> (request-path-components): Handle /output/=E2=80=A6 requests.
> * doc/cuirass.texi (Build information): Mention that you can get build
> information by output.

LGTM, thanks!

Ludo=E2=80=99.