From mboxrd@z Thu Jan  1 00:00:00 1970
From: Guillaume Le Vaillant <glv@posteo.net>
Subject: bug#37977: Mount options ignored for root file system
Date: Thu, 07 Nov 2019 19:28:10 +0100
Message-ID: <87eeyjils5.fsf@yamatai>
References: <87pnif6ec0.fsf@yamatai>
Mime-Version: 1.0
Content-Type: text/plain
Return-path: <bug-guix-bounces+gcggb-bug-guix=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:470:142:3::10]:35279)
 by lists.gnu.org with esmtp (Exim 4.90_1)
 (envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1iSmWl-0005oV-Ku
 for bug-guix@gnu.org; Thu, 07 Nov 2019 13:29:04 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
 (envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1iSmWk-0001bT-Kg
 for bug-guix@gnu.org; Thu, 07 Nov 2019 13:29:03 -0500
Received: from debbugs.gnu.org ([209.51.188.43]:35088)
 by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16)
 (Exim 4.71) (envelope-from <Debian-debbugs@debbugs.gnu.org>)
 id 1iSmWk-0001bM-8I
 for bug-guix@gnu.org; Thu, 07 Nov 2019 13:29:02 -0500
Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2)
 (envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1iSmWk-0005DW-38
 for bug-guix@gnu.org; Thu, 07 Nov 2019 13:29:02 -0500
Sender: "Debbugs-submit" <debbugs-submit-bounces@debbugs.gnu.org>
Resent-Message-ID: <handler.37977.B37977.157315130220002@debbugs.gnu.org>
In-reply-to: <87pnif6ec0.fsf@yamatai>
List-Id: Bug reports for GNU Guix <bug-guix.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/bug-guix>,
 <mailto:bug-guix-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/bug-guix>
List-Post: <mailto:bug-guix@gnu.org>
List-Help: <mailto:bug-guix-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/bug-guix>,
 <mailto:bug-guix-request@gnu.org?subject=subscribe>
Errors-To: bug-guix-bounces+gcggb-bug-guix=m.gmane.org@gnu.org
Sender: "bug-Guix" <bug-guix-bounces+gcggb-bug-guix=m.gmane.org@gnu.org>
To: 37977@debbugs.gnu.org


Guillaume Le Vaillant skribis:

> The filesystem options declared for the root file system are apparently
> ignored. This happens for a btrfs root filesystem on a LUKS volume.

This also happens on a basic btrfs root file system (without LUKS).

I tried adding "rootflags=defaults,autodefrag,compress=lzo" in kernel
arguments, but it didn't have any effect.

I then tried adding a one-shot service that remounts the root file
system, and it works, the options declared in '/etc/fstab' are taken
into consideration. This service just does 'mount -o remount /'.

--8<---------------cut here---------------start------------->8---
(define remount-rootfs-service-type
  (shepherd-service-type
   'remount-rootfs
   (const
    (shepherd-service
     (documentation "Remount rootfs with correct options.")
     (requirement '(udev))
     (provision '(remount-rootfs))
     (one-shot? #t)
     (start #~(lambda _
                (invoke (string-append #$util-linux "/bin/mount")
                        "-o" "remount" "/")))))))

(operating-system
  ...
  (services
    (cons* ...
           (service remount-rootfs-service-type #f)
           ...)))
--8<---------------cut here---------------end--------------->8---


I saw that the 'start' function of 'root-file-system-service-type'
doesn't do anything. Is it on purpose? Or could we make it remount the
root filesystem?