GNU bug report logs - #31199
Diff sym link bug

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

From: Alessandro <mirio <at> miriodev.net>
To: bug-diffutils <at> gnu.org
Subject: Diff sym link bug
Date: Tue, 17 Apr 2018 16:17:59 +0200

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

Hi,

How to reproduce:

Scenario:

|dirA .. bar -> foo foo dirB .. |

Diff man

|-N, --new-file treat absent files as empty --no-dereference don't follow 
symbolic links |

Output

|$ diff --no-dereference dirA dirB > /dev/null $ diff -N --no-dereference 
dirA dirB > /dev/null diff: dirB/bar: No such file or directory |


Version:

diff (GNU diffutils) 3.6

It's seems a bug, any fix or workaround for that?


Thanks

[Message part 2 (text/html, inline)]

Message #8 received at 31199 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Alessandro <mirio <at> miriodev.net>, 31199 <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
Date: Tue, 17 Apr 2018 08:57:47 -0700

On 04/17/2018 07:17 AM, Alessandro wrote:
>
> It's seems a bug, any fix or workaround for that?
>
I don't see a bug. "Don't follow symbolic links" doesn't mean "Pretend 
symbolic links do not exist".

Message #11 received at 31199 <at> debbugs.gnu.org (full text, mbox):

From: Alessandro <mirio <at> miriodev.net>
To: Paul Eggert <eggert <at> cs.ucla.edu>, 31199 <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
Date: Tue, 17 Apr 2018 20:28:56 +0200

Hi,

The bug is why show the error and ignore -N on sym link.

Thx

(+ML)


On 17/04/2018 17:57, Paul Eggert wrote:
> On 04/17/2018 07:17 AM, Alessandro wrote:
>>
>> It's seems a bug, any fix or workaround for that?
>>
> I don't see a bug. "Don't follow symbolic links" doesn't mean "Pretend 
> symbolic links do not exist".
>

Message #14 received at 31199 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Alessandro <mirio <at> miriodev.net>, 31199 <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
Date: Tue, 17 Apr 2018 13:12:03 -0700

On 04/17/2018 11:28 AM, Alessandro wrote:
> The bug is why show the error and ignore -N on sym link. 

I think we are miscommunicating. What I am saying is that diff is not 
ignoring -N, and there is an error if one directory has a dangling 
symlink and another directory has nothing.

Message #17 received at 31199 <at> debbugs.gnu.org (full text, mbox):

From: Alessandro <mirio <at> miriodev.net>
To: Paul Eggert <eggert <at> cs.ucla.edu>, 31199 <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
Date: Tue, 17 Apr 2018 22:34:15 +0200

So, how we can solve it?


On 17/04/2018 22:12, Paul Eggert wrote:
> On 04/17/2018 11:28 AM, Alessandro wrote:
>> The bug is why show the error and ignore -N on sym link. 
>
> I think we are miscommunicating. What I am saying is that diff is not 
> ignoring -N, and there is an error if one directory has a dangling 
> symlink and another directory has nothing.
>

Message #20 received at 31199 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Alessandro <mirio <at> miriodev.net>, 31199 <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
Date: Tue, 17 Apr 2018 13:49:15 -0700

On 04/17/2018 01:34 PM, Alessandro wrote:
> So, how we can solve it? 

Perhaps 'diff' should not report an error in this situation if -N is 
specified.

Message #23 received at 31199 <at> debbugs.gnu.org (full text, mbox):

From: Alessandro <mirio <at> miriodev.net>
To: Paul Eggert <eggert <at> cs.ucla.edu>, 31199 <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
Date: Tue, 17 Apr 2018 22:53:39 +0200

Yep i know but i need to use -N on my scenario.


On 17/04/2018 22:49, Paul Eggert wrote:
> On 04/17/2018 01:34 PM, Alessandro wrote:
>> So, how we can solve it? 
>
> Perhaps 'diff' should not report an error in this situation if -N is 
> specified.
>

Message #26 received at 31199 <at> debbugs.gnu.org (full text, mbox):

From: Alessandro <mirio <at> miriodev.net>
To: Paul Eggert <eggert <at> cs.ucla.edu>, 31199 <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
Date: Wed, 18 Apr 2018 21:26:47 +0200

Any update? Can you give me a temporary workaround for that?

Thanks


On 17/04/2018 22:53, Alessandro wrote:
> Yep i know but i need to use -N on my scenario.
>
>
> On 17/04/2018 22:49, Paul Eggert wrote:
>> On 04/17/2018 01:34 PM, Alessandro wrote:
>>> So, how we can solve it? 
>>
>> Perhaps 'diff' should not report an error in this situation if -N is 
>> specified.
>>
>

Message #29 received at 31199 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Alessandro <mirio <at> miriodev.net>, 31199 <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
Date: Wed, 18 Apr 2018 12:32:24 -0700

On 04/18/2018 12:26 PM, Alessandro wrote:
> Any update? Can you give me a temporary workaround for that? 

I do not have any update, no. My volunteer time is limited and this is 
lower priority right now.

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