GNU bug report logs - #20217
Allow users to use the daemon's default settings

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From: ludo <at> gnu.org (Ludovic Courtès)
To: 20217 <at> debbugs.gnu.org
Subject: bug#20217: Allow users to use the daemon's default settings
Date: Sat, 28 Mar 2015 15:36:19 +0100

[Message part 1 (text/plain, inline)]

The message below from guix-devel says it all.

Ludo’.

[Message part 2 (message/rfc822, inline)]

From: ludo <at> gnu.org (Ludovic Courtès)
To: Mark H Weaver <mhw <at> netris.org>
Cc: guix-devel <at> gnu.org
Subject: Using the daemon’s default settings
Date: Mon, 23 Mar 2015 22:11:17 +0100

Mark H Weaver <mhw <at> netris.org> skribis:

> Ludovic Courtès <ludo <at> gnu.org> writes:
>
>> commit 4d58122071bbd7bb56c9658a9bbe7621bf3e423d
>> Author: Ludovic Courtès <ludo <at> gnu.org>
>> Date:   Sun Mar 22 23:43:25 2015 +0100
>>
>>     store: Default to a non-empty list of substituters.
>>     
>>     Fixes <http://bugs.gnu.org/20163>.
>>     Reported by Mark H Weaver <mhw <at> netris.org>.
>>     
>>     * guix/store.scm (%default-substitute-urls): New variable.
>>       (set-build-options): Change default value of #:substitute-urls to
>>       %DEFAULT-SUBSTITUTE-URLS.

[...]

> Does this mean that even if I've configured my daemon to use a different
> set of substitute-urls, when I run 'guix' as root those settings will be
> overridden?

Yes.

> That seems suboptimal.

Right.

> We have a similar problem with the values of --cores and --max-jobs
> passed to guix-daemon being ignored because they are always overridden
> by our client.

Indeed.

> How can we fix these so that the daemon's settings are used unless the
> user specifically asks to override them in the client?

If you look at nix-daemon.cc:543, there’s currently no way for a client
to say “default value.”  The only way for a client to get the daemon’s
default values is to not call the ‘set-build-options’ RPC at all; it’s
all or nothing.

I think the way forward would be to add a new RPC, say
‘set-build-options2’, that would take a list of key/value pairs, where
keys are option names.  Options not mentioned in a ‘set-build-options2’
call would keep their default value.

How does that sound?

Thanks,
Ludo’.

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