GNU bug report logs - #25655
grep-2.28 is broken with multiple -e patterns

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Lars Wendler <polynomial-c <at> gentoo.org>
Subject: bug#25655: closed (Re: bug#25655: grep-2.28 is broken with
 multiple -e patterns)
Date: Wed, 08 Feb 2017 21:05:02 +0000

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Your bug report

#25655: grep-2.28 is broken with multiple -e patterns

which was filed against the grep package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 25655 <at> debbugs.gnu.org.

-- 
25655: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=25655
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Lars Wendler <polynomial-c <at> gentoo.org>, 25655-done <at> debbugs.gnu.org
Cc: base-system <at> gentoo.org
Subject: Re: bug#25655: grep-2.28 is broken with multiple -e patterns
Date: Wed, 8 Feb 2017 13:04:25 -0800

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Thanks for reporting that. It's a reasonably serious bug. I installed 
the attached patch to fix it.

[0001-grep-do-not-mishandle-.-in-multiple-patterns.patch (application/x-patch, attachment)]

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From: Lars Wendler <polynomial-c <at> gentoo.org>
To: bug-grep <at> gnu.org
Cc: base-system <at> gentoo.org
Subject: grep-2.28 is broken with multiple -e patterns
Date: Wed, 8 Feb 2017 20:49:35 +0100

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Hi,

we got a bug report a Gentoo [1] that grep-2.28 is broken when
searching for multiple patterns with -e:

grep-2.27:

  % echo ".tar" | grep -e "\.tar"; echo $?           
  .tar
  0

  % echo ".tar" | grep -e "\.tar" -e "\.tbz"; echo $?
  .tar
  0


grep-2.28:

   % echo ".tar" | grep -e "\.tar"; echo $?           
   .tar
   0

   % echo ".tar" | grep -e "\.tar" -e "\.tbz"; echo $?
   1


But this seems to be not the only issue:


echo "atbz" | grep -e "\.tar" -e ".tbz"

is matching "atbz"

echo ".tbz" | grep -e "\.tar" -e ".tbz"

matches ".tbz"

but

echo ".tar" | grep -e "\.tar" -e "tar"

only matches "ta".


We've identified commit 290ca116c9172d97b2b026951fac722d3bd3ced9 as the
one that introduced this regression

Kind regards
Lars

[1] https://bugs.gentoo.org/608644

-- 
Lars Wendler
Gentoo package maintainer
GPG: 21CC CF02 4586 0A07 ED93  9F68 498F E765 960E 9B39

Attention! New gpg key! See
https://www.gentoofan.org/blog/index.php?/archives/9-New-gpg-keys.html

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