From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Kernel modules in initrd
Date: Tue, 27 Feb 2018 16:02:16 +0100
Message-ID: <874lm23287.fsf@gnu.org>
References: <20180222211707.GB9758@jurong> <87eflck7ko.fsf@netris.org>
	<20180223020029.3babc4fa@scratchpost.org>
	<20180223152855.6a08f8bd@scratchpost.org>
	<20180223230239.GA6140@jurong>
	<20180225124330.2e706537@scratchpost.org> <87y3jfvkuv.fsf@gnu.org>
	<20180226172647.22d9e56b@scratchpost.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Return-path: <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:33751)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <ludo@gnu.org>) id 1eqglq-0007iR-PK
	for guix-devel@gnu.org; Tue, 27 Feb 2018 10:02:25 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <ludo@gnu.org>) id 1eqgln-0004yu-HC
	for guix-devel@gnu.org; Tue, 27 Feb 2018 10:02:22 -0500
Received: from hera.aquilenet.fr ([2a0c:e300::1]:60326)
	by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32)
	(Exim 4.71) (envelope-from <ludo@gnu.org>) id 1eqgln-0004vA-9v
	for guix-devel@gnu.org; Tue, 27 Feb 2018 10:02:19 -0500
In-Reply-To: <20180226172647.22d9e56b@scratchpost.org> (Danny Milosavljevic's
	message of "Mon, 26 Feb 2018 17:26:47 +0100")
List-Id: "Development of GNU Guix and the GNU System distribution."
	<guix-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/guix-devel/>
List-Post: <mailto:guix-devel@gnu.org>
List-Help: <mailto:guix-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=subscribe>
Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org
Sender: "Guix-devel" <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: guix-devel@gnu.org

Danny Milosavljevic <dannym@scratchpost.org> skribis:

> So what we would need next is something like modprobe written in guile.
>
> I think that ./gnu/build/linux-modules.scm load-linux-module* already doe=
s that.
>
> The only part missing is to replace %modprobe-wrapper by a guile script
> which imports ./gnu/build/linux-modules.scm load-linux-module*, interprets
> some of the modprobe options and then masquerades as modprobe without inv=
oking
> modprobe.
>
> The reason is that the kernel calls us back when it needs a module (for
> example when you mount something and it needs a charset converter or some=
thing).
>
> (the name of the executable invoked is configured via /proc/sys/kernel/mo=
dprobe)
>
> This can happen quite early in the boot process - and it took me some time
> to get the order and also the environment variables right.  We should be =
able
> to reuse that for the pure Guile modprobe.
>
> After the patch we don't *manually* load any of the modules - and all the
> tests work.  I booted my system with it - that also works.

I see, that=E2=80=99s a workable plan, we should do that!

> P.S. How come glibc is in the initrd?  Shouldn't guile have statically li=
nked it?
> glibc is like 50000 kiB.  In that case saving 800 kiB is not really worth=
 it...

One of the packages that ends up in the initrd must be dynamically
linked.  You need to find out which one it is.

Thanks for the explanations!

Ludo=E2=80=99.