From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Using the =?utf-8?Q?daemon=E2=80=99s?= default settings
Date: Mon, 23 Mar 2015 22:11:17 +0100
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In-Reply-To: <87egofr30v.fsf@netris.org> (Mark H. Weaver's message of "Mon, 23
	Mar 2015 14:18:24 -0400")
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To: Mark H Weaver <mhw@netris.org>
Cc: guix-devel@gnu.org

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

> Ludovic Court=C3=A8s <ludo@gnu.org> writes:
>
>> commit 4d58122071bbd7bb56c9658a9bbe7621bf3e423d
>> Author: Ludovic Court=C3=A8s <ludo@gnu.org>
>> Date:   Sun Mar 22 23:43:25 2015 +0100
>>
>>     store: Default to a non-empty list of substituters.
>>=20=20=20=20=20
>>     Fixes <http://bugs.gnu.org/20163>.
>>     Reported by Mark H Weaver <mhw@netris.org>.
>>=20=20=20=20=20
>>     * 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=E2=80=99s currently no way for a cl=
ient
to say =E2=80=9Cdefault value.=E2=80=9D  The only way for a client to get t=
he daemon=E2=80=99s
default values is to not call the =E2=80=98set-build-options=E2=80=99 RPC a=
t all; it=E2=80=99s
all or nothing.

I think the way forward would be to add a new RPC, say
=E2=80=98set-build-options2=E2=80=99, that would take a list of key/value p=
airs, where
keys are option names.  Options not mentioned in a =E2=80=98set-build-optio=
ns2=E2=80=99
call would keep their default value.

How does that sound?

Thanks,
Ludo=E2=80=99.