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bug#11108: [PATCH] chmod: fix symlink race condition
From: |
Jim Meyering |
Subject: |
bug#11108: [PATCH] chmod: fix symlink race condition |
Date: |
Wed, 28 Mar 2012 22:13:12 +0200 |
Paul Eggert wrote:
> On 03/28/2012 12:36 AM, Jim Meyering wrote:
>> I presume you'll update NEWS, too, where you can say
>> [bug introduced in the beginning]
>
> Thanks, good point. I did that in the version I just committed
> to the master.
Rats:
$ ./chmod u+w f
./chmod: changing permissions of 'f': Operation not supported
That fix introduces chmod failures on several important systems,
including my Fedora 17 desktop ;-)
I confess that I had not tested it, and had missed or forgotten
this part of the GNU/Linux/fchmodat documentation:
AT_SYMLINK_NOFOLLOW
If pathname is a symbolic link, do not dereference it: instead
operate on the link itself. This flag is not currently imple-
mented.
The nixos/hydra build server is reporting failures, too:
http://hydra.nixos.org/build/2341393
http://hydra.nixos.org/build/2341397
http://hydra.nixos.org/build/2341395