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Re: Bug#669084: grep does not match anything when reading from stdin


From: Aníbal Monsalve Salazar
Subject: Re: Bug#669084: grep does not match anything when reading from stdin
Date: Tue, 17 Apr 2012 20:41:19 +1000
User-agent: Mutt/1.5.20 (2009-06-14)

On Tue, Apr 17, 2012 at 08:13:49PM +1000, Aníbal Monsalve Salazar wrote:
>On Tue, Apr 17, 2012 at 11:08:16AM +0200, Tino Keitel wrote:
>>On Tue, Apr 17, 2012 at 10:25:03 +0200, Tino Keitel wrote:
>>>On Tue, Apr 17, 2012 at 10:23:28 +0200, Tino Keitel wrote:
>>>>On Tue, Apr 17, 2012 at 18:07:29 +1000, Aníbal Monsalve Salazar wrote:
>>>>>On Tue, Apr 17, 2012 at 09:23:58AM +0200, Tino Keitel wrote:
>>>>>>Package: grep
>>>>>>Version: 2.11-2
>>>>>>Severity: important
>>>>>>
>>>>>>grep does not match anything when reading from stdin. Reading from
>>>>>>a file works.
>>>>>>
>>>>>>$ echo foo > foo
>>>>>>$ grep . foo
>>>>>>foo
>>>>>>$ cat foo | grep .
>>>>>>$ echo foo | grep .
>>>>>>$ 
>>>>>
>>>>>It works for me, please see below.
>>>
>>>The version from testing (2.10-1) works here, too.
>>
>>This snipset from the 2.11 main.c is very likely the culprit. The
>>'S_ISFIFO (stats->stat.st_mode)' causes stdin to be skipped if it is a
>>pipe.
>>
>>if ((directories == SKIP_DIRECTORIES && S_ISDIR (stats->stat.st_mode))
>>    || (devices == SKIP_DEVICES && (S_ISCHR (stats->stat.st_mode)
>>                                    || S_ISBLK (stats->stat.st_mode)
>>                                    || S_ISSOCK (stats->stat.st_mode)
>>                                    || S_ISFIFO (stats->stat.st_mode))))
>>  {
>>    if (file)
>>      close (desc);
>>    return 1;
>>  }
>
>Hello Jim,
>
>grep-2.11 introduced a regression related to the "-D skip" parameter
>option.
>
>With grep-2.10 (or less than 2.10):
>
>$ echo foo | grep -D skip foo; echo $?
>foo
>0
>
>With grep-2.11:
>
>$ echo foo | grep -D skip foo; echo $?
>1
>
>Timo suggests that the possible culprit is the code above.
>
>The Debian bug report is at http://bugs.debian.org/668585

Typo. The correct address is http://bugs.debian.org/669084

>Cheers,
>
>Anibal



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