GNU bug report logs - #23564
Unexpected results from `ln --symbolic --interactive --relative`

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Florian Schweiger <florian.schweiger <at> bbc.co.uk>
To: <bug-coreutils <at> gnu.org>
Subject: Unexpected results from `ln --symbolic --interactive --relative`
Date: Tue, 17 May 2016 10:56:06 +0100

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

Hi,

I've noticed the following unexpected behaviour in `ln` which appears to 
be a bug. I'm referring to the attached MWE Bash script 
test_ln-symbolic-interactive-relative.sh.

When run, it creates a directory "test_dir" and a file "test_file" in 
the current working directory. Then it tries to create a relative, 
symbolic link to the file in said directory. When the "--interactive" 
option is present, this operation fails every other time in that it 
overwrites the existing link with an unreachable target.

DETAILED DESCRIPTION:

* First invocation
    $ ./test_ln-symbolic-interactive-relative.sh
    ln -sirv test_file test_dir/test_link
    ‘test_dir/test_link’ -> ‘../test_file’
* Second invocation:
    $ ./test_ln-symbolic-interactive-relative.sh
    ln -sirv test_file test_dir/test_link
    ln: replace ‘test_dir/test_link’? y
    ‘test_dir/test_link’ -> ‘test_file’
* Third invocation:
    $ ./test_ln-symbolic-interactive-relative.sh
    ln -sirv test_file test_dir/test_link
    ln: replace ‘test_dir/test_link’? y
    ‘test_dir/test_link’ -> ‘../test_file’


AFFECTED SYSTEM:
    * ln (GNU coreutils) 8.21
    * GNU bash, version 4.3.11(1)-release (x86_64-pc-linux-gnu)
    * Ubuntu 14.04.4 LTS
    * Linux 3.13.0-67-generic #110-Ubuntu SMP Fri Oct 23 13:24:41 UTC 
2015 x86_64 x86_64 x86_64 GNU/Linux

On other systems, the symbolic link is set as expected every time.

WORKING SETUP:
    * ln (GNU coreutils) 8.21
    * GNU bash, version 4.2.53(1)-release (x86_64-suse-linux-gnu)
    * openSUSE 13.1 (Bottle) (x86_64)
    * Linux 3.11.10-29-desktop #1 SMP PREEMPT Thu Mar 5 16:24:00 UTC 
2015 (338c513) x86_64 x86_64 x86_64 GNU/Linux

Cheers,
Florian



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[test_ln-symbolic-interactive-relative.tar.gz (application/gzip, attachment)]

Message #8 received at 23564 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: Florian Schweiger <florian.schweiger <at> bbc.co.uk>, 23564 <at> debbugs.gnu.org
Subject: Re: bug#23564: Unexpected results from `ln --symbolic --interactive
 --relative`
Date: Tue, 17 May 2016 17:10:34 +0100

unarchive 14116
forcemerge 14116 17126 23564
close 23564
stop

On 17/05/16 10:56, Florian Schweiger wrote:
> Hi,
>
> I've noticed the following unexpected behaviour in `ln` which appears to
> be a bug. I'm referring to the attached MWE Bash script
> test_ln-symbolic-interactive-relative.sh.
>
> When run, it creates a directory "test_dir" and a file "test_file" in
> the current working directory. Then it tries to create a relative,
> symbolic link to the file in said directory. When the "--interactive"
> option is present, this operation fails every other time in that it
> overwrites the existing link with an unreachable target.
>
> DETAILED DESCRIPTION:
>
> * First invocation
>       $ ./test_ln-symbolic-interactive-relative.sh
>       ln -sirv test_file test_dir/test_link
>       ‘test_dir/test_link’ -> ‘../test_file’
> * Second invocation:
>       $ ./test_ln-symbolic-interactive-relative.sh
>       ln -sirv test_file test_dir/test_link
>       ln: replace ‘test_dir/test_link’? y
>       ‘test_dir/test_link’ -> ‘test_file’
> * Third invocation:
>       $ ./test_ln-symbolic-interactive-relative.sh
>       ln -sirv test_file test_dir/test_link
>       ln: replace ‘test_dir/test_link’? y
>       ‘test_dir/test_link’ -> ‘../test_file’
>
>
> AFFECTED SYSTEM:
>       * ln (GNU coreutils) 8.21
>       * GNU bash, version 4.3.11(1)-release (x86_64-pc-linux-gnu)
>       * Ubuntu 14.04.4 LTS

This was fixed in V8.22 with:
http://git.sv.gnu.org/gitweb/?p=coreutils.git;a=commitdiff;h=v8.21-27-ge52293a

thanks,
Pádraig

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