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bug#19491: /etc/mtab give wrong entries for early-mounted items.

From: Ludovic Courtès
Subject: bug#19491: /etc/mtab give wrong entries for early-mounted items.
Date: Sun, 04 Jan 2015 17:04:58 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux)

宋文武 <address@hidden> skribis:

> Ludovic Courtès <address@hidden> writes:
>> 宋文武 <address@hidden> skribis:
>>> Notably, I have:
>>>   /dev/sda1 /root ext4 rw,relatime,data=ordered 0 0
>>>   none /root//dev devtmpfs rw 0 0
>>> Which should be:
>>>   /dev/sda1 / ...
>>>   none /dev ...
>>> Why not make /etc/mtab a symlink to /proc/self/mounts?
>> This sounds appealing, but it seems that libmount in util-linux will
>> insist to update /etc/mtab.
>> Do you have evidence that it could cope with it?
> Not sure, but I think libmount should just work fine.
> util-linux support this since 2.19:
>   https://www.kernel.org/pub/linux/utils/util-linux/v2.19/v2.19-ReleaseNotes
> Debian make this default at 2011:
>   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=494001

OK, it sounds like it’s safe, then.  :-)

Would you like to propose a patch?  There are changes to make around
linux-boot.scm, and also in (guix build syscalls) the #:update-mtab?
argument should default to #f.


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