GNU bug report logs - #16539
df command, possible bug?

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From: Pádraig Brady <P <at> draigBrady.com>
To: Bernhard Voelker <mail <at> bernhard-voelker.de>
Cc: 16539 <at> debbugs.gnu.org
Subject: bug#16539: More details on df command output for you
Date: Wed, 18 Jun 2014 18:21:50 +0100

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

On 06/18/2014 01:09 PM, Pádraig Brady wrote:
> On 06/18/2014 02:19 AM, Bernhard Voelker wrote:
>> On 06/17/2014 06:03 PM, Pádraig Brady wrote:
>>> From 0a4b8027049f6746a237c9fc34a0e0a4afdcfc62 Mon Sep 17 00:00:00 2001
>>> From: =?UTF-8?q?P=C3=A1draig=20Brady?= <P <at> draigBrady.com>
>>> Date: Wed, 4 Jun 2014 00:09:11 +0100
>>> Subject: [PATCH] df: output placeholder values for inaccessible mount points
> 
> I agree with all your suggested tweaks here.
> 
>> Finally, I have an edge case on my PC which is not yet covered:
>> I have a backup partition mounted on /root/backup (which is not
>> accessible by a normal user), and a read-only bind-mount of it:
>>
>>   $ mount /dev/sda1 /root/backup
>>   $ mount --bind    /root/backup /media/backup
>>   $ mount -o ro,remount,bind     /media/backup
>>
>> (The 3rd command is just there for setting the read-only flag).
>>
>> df-8.21 perfectly skipped the inaccessible entry and went ahead
>> with the read-only copy
>>
>>   $ /usr/bin/df /dev/sda3
>>   Filesystem     1K-blocks      Used Available Use% Mounted on
>>   /dev/sda3      155396036 124425132  23054156  85% /media/backup
>>
>> while the latest one from git plus these 2 patches is falling over:
>>
>>   $ src/df /dev/sda3
>>   src/df: ‘/root/backup’: Permission denied
>>
>> This is a little regression.
>> Thus said, I'm not 100% happy with the filtering yet.
> 
> The above is a separate case actually, triggered in 8.22 with:
> http://git.sv.gnu.org/gitweb/?p=coreutils.git;a=commitdiff;h=2091f449
> Note that only triggers the issue when the last mount point for a device
> is accessible. If the /proc/mounts order was different, then you'd get the issue anyway.
> I'll fix this by adding a stat() to the selection criteria in get_disk().

The attached 2 patches on top of current master,
should address your suggested tweaks and above ordering issue.

thanks,
Pádraig.

[df-fix-wrong-device.diff (text/x-patch, attachment)]

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