#30647 - [PATCH] guix build: Support '--remote-log-file=PACKAGE'.

Package	Source(s)		Maintainer(s)
guix-patches		PTS Buildd Popcon

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From: Oleg Pykhalov <go.wigust@gmail.com>
To: ludo@gnu.org (Ludovic Courtès)
Subject: Re: [bug#30647] [PATCH] guix build: Support
 '--remote-log-file=PACKAGE'.
References: <20180228141959.19789-1-go.wigust@gmail.com>
 <87po4ou5ie.fsf@gnu.org> <87606ge8c5.fsf@gmail.com>
 <874lm06ic9.fsf@gnu.org>
Date: Thu, 01 Mar 2018 18:40:50 +0300
In-Reply-To: <874lm06ic9.fsf@gnu.org> ("Ludovic
 \=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
 \=\?utf-8\?Q\?s\?\= message of "Thu, 01 Mar 2018 14:22:46 +0100")
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[Message part 1 (text/plain, inline)]

ludo@gnu.org (Ludovic Courtès) writes:

>>>> ‘--remote-log-file’ allows to get a URL for a build log file on a substitute
>>>> server regardless is it built locally.  ‘--log-file’ returns always local
>>>> build log file.
>>>
>>> What did you think of having ‘--log-file’ transparently fall back to
>>> searching for log files on substitute servers?
>
> To put it differently: what do you dislike about the current behavior?

Suppose package build failed locally.  I want to receive a log from a
remote server.  I could do it manually by:

1.  Removing local failed log.
2.  ‘wget’, but I need to know a URL.
3.  Hydra web interface, which is slow (especially multiple packages).

> No no: keep the current behavior, but print something when we’re looking
> for a remote log file (currently it silently checks whether the remote
> log file is available.)

Still not clear to me.  If ‘guix --log-file’ checks for a remote log
file, then it gets a valid URL to a remote build log file for free,
doesn't it?

>> I don't think mixing those in one output is good, because for example
>> you cannot do like:
>>
>> diff -u <(guix build --log-file hello) <(guix build --remote-log-file hello)
>
> I see.  I guess I’ve never wanted that, or rather, when I do, I
> explicitly wget the remote log file.  :-)

Could I ask What's your workflow for ‘wget’?

> So I guess I’m unconvinced about the need for a separate
> ‘--remote-log-file’ option.
>
> What do people think?  Ricardo?

Maybe CC him?  Or is it a bad etiquette for a mailing list, because he
is subscribed?

>> As a better approach in addition to ‘--no-substitutes’, maybe we could
>> implement ‘--only-substitutes’ (as I remember Nix has it)?  Such flag
>> will return a remote log file and will avoid building packages locally.
>
> That could be an option, but that’s much more work (not limited to log
> file handling.)

Yes, but benefits (especially avoid building packages locally) are
worth.

If you don't agree with the patch, I'll not complain and will try to
work on ‘--only-substitutes’.  :-)

Oleg.

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#30647 [PATCH] guix build: Support '--remote-log-file=PACKAGE'.