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Re: `du` check for directory loop avoidance

From: Bernhard Voelker
Subject: Re: `du` check for directory loop avoidance
Date: Thu, 19 Dec 2013 10:37:51 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0

On 12/18/2013 07:41 PM, Pádraig Brady wrote:
> I need to look into this some more,
> but we should at least reword the warning to something more generic

BTW: the diagnostic in du(1) has been improved in 8.20 by commit

but chcon, chmod, chown, chgrp, rm, and mv are affected, too:

  $ git grep emit_cycle_warning | cat
  src/chcon.c:          emit_cycle_warning (file_full_name);
  src/chmod.c:          emit_cycle_warning (file_full_name);
  src/chown-core.c:          emit_cycle_warning (file_full_name);
  src/du.c:                emit_cycle_warning (file);
  src/remove.c:      emit_cycle_warning (ent->fts_path);
  src/system.h:#define emit_cycle_warning(file_name)    \


  $ mount -t tmpfs tmpfs /mnt

  $ mkdir /mnt/mnt

  $ mount --bind /mnt /mnt/mnt

  $ du /mnt
  du: mount point ‘/mnt/mnt’ already traversed
  0     /mnt

  $ chown -R root  /mnt
  chown: WARNING: Circular directory structure.
  This almost certainly means that you have a corrupted file system.
  The following directory is part of the cycle:

Just for the record, non-FTS ls(1) uses a different diagnostic:

  $ ls -R /mnt
  ls: /mnt/mnt: not listing already-listed directory

It seems that there is still room for improvement.

Have a nice day,

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