GNU bug report logs - #15173
[cp] --link overrides dereference settings

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Package: coreutils;

Reported by: Gian Piero Carrubba <gpiero <at> rm-rf.it>

Date: Fri, 23 Aug 2013 21:55:02 UTC

Severity: normal

Tags: fixed

Merged with 23120

Done: Bernhard Voelker <mail <at> bernhard-voelker.de>

Bug is archived. No further changes may be made.

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From: Pádraig Brady <P <at> draigBrady.com>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 15173 <at> debbugs.gnu.org
Subject: bug#15173: [PATCH] cp: with --link always use linkat() if available
Date: Mon, 10 Feb 2014 04:02:22 +0000

[Message part 1 (text/plain, inline)]
On 02/10/2014 02:29 AM, Paul Eggert wrote:
> Pádraig Brady wrote:
>> +#if ! defined HAVE_LINKAT
>>              && !(LINK_FOLLOWS_SYMLINKS && S_ISLNK (src_mode)
>> -                && x->dereference == DEREF_NEVER))
>> +                && x->dereference == DEREF_NEVER)
>> +#endif
> 
> Could you reword that sort of thing so as not to use the #if inside an expression?  Something like this instead, perhaps, earlier in the code:
> 
>   #if !defined HAVE_LINKAT && LINK_FOLLOWS_SYMLINKS
>   # define LINKAT_FOLLOWS_SYMLINKS 1
>   #else
>   # define LINKAT_FOLLOWS_SYMLINKS 0
>   #endif

That's slightly confusing as linkat() emulation never
actually symlinks the referent.  I went for the more direct:

 #if defined HAVE_LINKAT || ! LINK_FOLLOWS_SYMLINKS
 # define CAN_HARDLINK_SYMLINKS 1
 #else
 # define CAN_HARDLINK_SYMLINKS 0
 #endif

Full patch is attached.

thanks,
Pádraig.

[cp-linkat.patch (text/x-patch, attachment)]
This bug report was last modified 6 years and 206 days ago.

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