GNU bug report logs - #31199
Diff sym link bug

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Package: diffutils; Reported by: Alessandro <mirio@HIDDEN>; dated Tue, 17 Apr 2018 15:01:02 UTC; Maintainer for diffutils is bug-diffutils@HIDDEN.

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Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
To: Paul Eggert <eggert@HIDDEN>, 31199 <at> debbugs.gnu.org
References: <3bbbb0b4-4060-4332-ca41-cb0b4c611e3c@HIDDEN>
 <49106d81-eea0-e53b-dddb-65f75c784a8e@HIDDEN>
 <9b96a7f1-db4d-bd66-d733-d46a82e4374a@HIDDEN>
 <bbb52846-f3da-6fe9-e471-00e4f100b81a@HIDDEN>
 <c9b857c9-ce8c-fae0-fdcd-b9cff404069f@HIDDEN>
 <b1fdea3c-5fcd-7f4d-f916-a36768749d28@HIDDEN>
From: Alessandro <mirio@HIDDEN>
Message-ID: <77b05a0f-e895-a714-ed6f-2d7d2895bcc7@HIDDEN>
Date: Tue, 17 Apr 2018 22:53:39 +0200
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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.
>





Information forwarded to bug-diffutils@HIDDEN:
bug#31199; Package diffutils. Full text available.

Message received at 31199 <at> debbugs.gnu.org:


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Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
To: Alessandro <mirio@HIDDEN>, 31199 <at> debbugs.gnu.org
References: <3bbbb0b4-4060-4332-ca41-cb0b4c611e3c@HIDDEN>
 <49106d81-eea0-e53b-dddb-65f75c784a8e@HIDDEN>
 <9b96a7f1-db4d-bd66-d733-d46a82e4374a@HIDDEN>
 <bbb52846-f3da-6fe9-e471-00e4f100b81a@HIDDEN>
 <c9b857c9-ce8c-fae0-fdcd-b9cff404069f@HIDDEN>
From: Paul Eggert <eggert@HIDDEN>
Organization: UCLA Computer Science Department
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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.





Information forwarded to bug-diffutils@HIDDEN:
bug#31199; Package diffutils. Full text available.

Message received at 31199 <at> debbugs.gnu.org:


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Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
To: Paul Eggert <eggert@HIDDEN>, 31199 <at> debbugs.gnu.org
References: <3bbbb0b4-4060-4332-ca41-cb0b4c611e3c@HIDDEN>
 <49106d81-eea0-e53b-dddb-65f75c784a8e@HIDDEN>
 <9b96a7f1-db4d-bd66-d733-d46a82e4374a@HIDDEN>
 <bbb52846-f3da-6fe9-e471-00e4f100b81a@HIDDEN>
From: Alessandro <mirio@HIDDEN>
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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.
>





Information forwarded to bug-diffutils@HIDDEN:
bug#31199; Package diffutils. Full text available.

Message received at 31199 <at> debbugs.gnu.org:


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Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
To: Alessandro <mirio@HIDDEN>, 31199 <at> debbugs.gnu.org
References: <3bbbb0b4-4060-4332-ca41-cb0b4c611e3c@HIDDEN>
 <49106d81-eea0-e53b-dddb-65f75c784a8e@HIDDEN>
 <9b96a7f1-db4d-bd66-d733-d46a82e4374a@HIDDEN>
From: Paul Eggert <eggert@HIDDEN>
Organization: UCLA Computer Science Department
Message-ID: <bbb52846-f3da-6fe9-e471-00e4f100b81a@HIDDEN>
Date: Tue, 17 Apr 2018 13:12:03 -0700
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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.





Information forwarded to bug-diffutils@HIDDEN:
bug#31199; Package diffutils. Full text available.

Message received at 31199 <at> debbugs.gnu.org:


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Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
To: Paul Eggert <eggert@HIDDEN>, 31199 <at> debbugs.gnu.org
References: <3bbbb0b4-4060-4332-ca41-cb0b4c611e3c@HIDDEN>
 <49106d81-eea0-e53b-dddb-65f75c784a8e@HIDDEN>
From: Alessandro <mirio@HIDDEN>
Message-ID: <9b96a7f1-db4d-bd66-d733-d46a82e4374a@HIDDEN>
Date: Tue, 17 Apr 2018 20:28:56 +0200
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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".
>





Information forwarded to bug-diffutils@HIDDEN:
bug#31199; Package diffutils. Full text available.

Message received at 31199 <at> debbugs.gnu.org:


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Subject: Re: [bug-diffutils] bug#31199: Diff sym link bug
To: Alessandro <mirio@HIDDEN>, 31199 <at> debbugs.gnu.org
References: <3bbbb0b4-4060-4332-ca41-cb0b4c611e3c@HIDDEN>
From: Paul Eggert <eggert@HIDDEN>
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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".





Information forwarded to bug-diffutils@HIDDEN:
bug#31199; Package diffutils. Full text available.

Message received at submit <at> debbugs.gnu.org:


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Subject: Diff sym link bug
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This is a multi-part message in MIME format.
--------------7D5F3DBD83CFF952E287E70E
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit

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


--------------7D5F3DBD83CFF952E287E70E
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: 7bit

<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=utf-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <p style="margin: 0px 0px 0.357143em; padding: 0px; font-size: 14px;
      line-height: 1.42857em; color: rgb(34, 34, 34); font-family:
      verdana, arial, helvetica, sans-serif; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: normal; letter-spacing: normal; orphans: 2;
      text-align: start; text-indent: 0px; text-transform: none;
      white-space: normal; widows: 2; word-spacing: 0px;
      -webkit-text-stroke-width: 0px; text-decoration-style: initial;
      text-decoration-color: initial;">Hi,</p>
    <p style="margin: 0px 0px 0.357143em; padding: 0px; font-size: 14px;
      line-height: 1.42857em; color: rgb(34, 34, 34); font-family:
      verdana, arial, helvetica, sans-serif; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: normal; letter-spacing: normal; orphans: 2;
      text-align: start; text-indent: 0px; text-transform: none;
      white-space: normal; widows: 2; word-spacing: 0px;
      -webkit-text-stroke-width: 0px; text-decoration-style: initial;
      text-decoration-color: initial;">How to reproduce:<br>
    </p>
    <p style="margin: 0.357143em 0px; padding: 0px; font-size: 14px;
      line-height: 1.42857em; color: rgb(34, 34, 34); font-family:
      verdana, arial, helvetica, sans-serif; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: normal; letter-spacing: normal; orphans: 2;
      text-align: start; text-indent: 0px; text-transform: none;
      white-space: normal; widows: 2; word-spacing: 0px;
      -webkit-text-stroke-width: 0px; text-decoration-style: initial;
      text-decoration-color: initial;">Scenario:</p>
    <pre style="margin: 0.357143em 0px; padding: 4px 9px; border: 1px solid rgb(230, 230, 222); background-color: rgb(255, 255, 255); border-radius: 2px; overflow: auto; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;"><code style="font-family: monospace, monospace; font-style: normal; font-weight: normal; margin: 0px 2px; padding: 0px !important; border: 0px; background-color: transparent; border-radius: 2px; white-space: pre; word-break: normal; display: block; font-size: 1em; line-height: 1.42857em;">dirA
    ..
    bar -&gt; foo
    foo

dirB
    ..
</code></pre>
    <p style="margin: 0.357143em 0px; padding: 0px; font-size: 14px;
      line-height: 1.42857em; color: rgb(34, 34, 34); font-family:
      verdana, arial, helvetica, sans-serif; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: normal; letter-spacing: normal; orphans: 2;
      text-align: start; text-indent: 0px; text-transform: none;
      white-space: normal; widows: 2; word-spacing: 0px;
      -webkit-text-stroke-width: 0px; text-decoration-style: initial;
      text-decoration-color: initial;">Diff man</p>
    <pre style="margin: 0.357143em 0px; padding: 4px 9px; border: 1px solid rgb(230, 230, 222); background-color: rgb(255, 255, 255); border-radius: 2px; overflow: auto; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;"><code style="font-family: monospace, monospace; font-style: normal; font-weight: normal; margin: 0px 2px; padding: 0px !important; border: 0px; background-color: transparent; border-radius: 2px; white-space: pre; word-break: normal; display: block; font-size: 1em; line-height: 1.42857em;">-N, --new-file
    treat absent files as empty

--no-dereference
    don't follow symbolic links
</code></pre>
    <p style="margin: 0.357143em 0px; padding: 0px; font-size: 14px;
      line-height: 1.42857em; color: rgb(34, 34, 34); font-family:
      verdana, arial, helvetica, sans-serif; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: normal; letter-spacing: normal; orphans: 2;
      text-align: start; text-indent: 0px; text-transform: none;
      white-space: normal; widows: 2; word-spacing: 0px;
      -webkit-text-stroke-width: 0px; text-decoration-style: initial;
      text-decoration-color: initial;">Output</p>
    <pre style="margin: 0.357143em 0px; padding: 4px 9px; border: 1px solid rgb(230, 230, 222); background-color: rgb(255, 255, 255); border-radius: 2px; overflow: auto; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;"><code style="font-family: monospace, monospace; font-style: normal; font-weight: normal; margin: 0px 2px; padding: 0px !important; border: 0px; background-color: transparent; border-radius: 2px; white-space: pre; word-break: normal; display: block; font-size: 1em; line-height: 1.42857em;">$ diff --no-dereference dirA dirB &gt; /dev/null

$ diff -N --no-dereference dirA dirB &gt; /dev/null
diff: dirB/bar: No such file or directory
</code></pre>
    <p style="margin: 0.357143em 0px; padding: 0px; font-size: 14px;
      line-height: 1.42857em; color: rgb(34, 34, 34); font-family:
      verdana, arial, helvetica, sans-serif; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: normal; letter-spacing: normal; orphans: 2;
      text-align: start; text-indent: 0px; text-transform: none;
      white-space: normal; widows: 2; word-spacing: 0px;
      -webkit-text-stroke-width: 0px; text-decoration-style: initial;
      text-decoration-color: initial;"><br>
    </p>
    <p style="margin: 0.357143em 0px; padding: 0px; font-size: 14px;
      line-height: 1.42857em; color: rgb(34, 34, 34); font-family:
      verdana, arial, helvetica, sans-serif; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: normal; letter-spacing: normal; orphans: 2;
      text-align: start; text-indent: 0px; text-transform: none;
      white-space: normal; widows: 2; word-spacing: 0px;
      -webkit-text-stroke-width: 0px; text-decoration-style: initial;
      text-decoration-color: initial;">Version:</p>
    <p style="margin: 0.357143em 0px; padding: 0px; font-size: 14px;
      line-height: 1.42857em; color: rgb(34, 34, 34); font-family:
      verdana, arial, helvetica, sans-serif; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: normal; letter-spacing: normal; orphans: 2;
      text-align: start; text-indent: 0px; text-transform: none;
      white-space: normal; widows: 2; word-spacing: 0px;
      -webkit-text-stroke-width: 0px; text-decoration-style: initial;
      text-decoration-color: initial;">diff (GNU diffutils) 3.6<br>
      <br>
    </p>
    <p style="margin: 0.357143em 0px; padding: 0px; font-size: 14px;
      line-height: 1.42857em; color: rgb(34, 34, 34); font-family:
      verdana, arial, helvetica, sans-serif; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: normal; letter-spacing: normal; orphans: 2;
      text-align: start; text-indent: 0px; text-transform: none;
      white-space: normal; widows: 2; word-spacing: 0px;
      -webkit-text-stroke-width: 0px; text-decoration-style: initial;
      text-decoration-color: initial;">It's seems a bug, any fix or
      workaround for that?</p>
    <p style="margin: 0.357143em 0px 0px; padding: 0px; font-size: 14px;
      line-height: 1.42857em; color: rgb(34, 34, 34); font-family:
      verdana, arial, helvetica, sans-serif; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: normal; letter-spacing: normal; orphans: 2;
      text-align: start; text-indent: 0px; text-transform: none;
      white-space: normal; widows: 2; word-spacing: 0px;
      -webkit-text-stroke-width: 0px; text-decoration-style: initial;
      text-decoration-color: initial;"><br>
    </p>
    <p style="margin: 0.357143em 0px 0px; padding: 0px; font-size: 14px;
      line-height: 1.42857em; color: rgb(34, 34, 34); font-family:
      verdana, arial, helvetica, sans-serif; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: normal; letter-spacing: normal; orphans: 2;
      text-align: start; text-indent: 0px; text-transform: none;
      white-space: normal; widows: 2; word-spacing: 0px;
      -webkit-text-stroke-width: 0px; text-decoration-style: initial;
      text-decoration-color: initial;">Thanks</p>
  </body>
</html>

--------------7D5F3DBD83CFF952E287E70E--




Acknowledgement sent to Alessandro <mirio@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-diffutils@HIDDEN. Full text available.
Report forwarded to bug-diffutils@HIDDEN:
bug#31199; Package diffutils. Full text available.
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Last modified: Tue, 17 Apr 2018 21:00:02 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.