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Re: [PATCH] Support returning build information by output.

From: Christopher Baines
Subject: Re: [PATCH] Support returning build information by output.
Date: Thu, 16 Jan 2020 08:36:23 +0000
User-agent: mu4e 1.2.0; emacs 26.3

Ludovic Courtès <address@hidden> writes:

> Christopher Baines <address@hidden> 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 outputs,
>> the probability of getting the data back from Cuirass is reduced.
>> This is because Cuirass might not have build the exact derivation you have,
>> but a different derivation that produces the same outputs (this can commonly
>> 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 information 
>> 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/… requests.
>> * doc/cuirass.texi (Build information): Mention that you can get build
>> information by output.
> LGTM, thanks!

Great, I've pushed this now :)

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