From: Andreas Schwab <schwab@linux-m68k.org>
Date: Mon, 09 Apr 2012 06:40:03 GMT
Subject: Re: [PATCH] Avoid bug in Solaris xpg4/sed as used in submodule
Message-ID: <m2sjgde7cs.fsf@linux-m68k.org>
In-Reply-To: <1333935414-10389-1-git-send-email-bwalton@artsci.utoronto.ca>

Ben Walton <bwalton@artsci.utoronto.ca> writes:

> The sed provided by Solaris in /usr/xpg4/bin has a bug whereby an
> unanchored regex using * for zero or more repetitions sees two
> separate matches fed to the substitution engine in some cases.
>
> This is evidenced by:
>
> $ for sed in /usr/xpg4/bin/sed /usr/bin/sed /opt/csw/gnu/sed; do \
> echo 'ab' | $sed -e 's|[a]*|X|g'; \
> done
> XXbX
> XbX
> XbX
>
> This bug was triggered during a git submodule clone operation as
> exercised in the setup stage of t5526-fetch-submodules when using the
> default SANE_TOOL_PATH for Solaris.  It led to paths such as
> ..../.. being used in the submodule .git gitdir reference.
>
> Using the expression 's|\([^/]*\(/*\)\)|..\2|g' provides the desired

How about using 's|[^/][^/]*|..|g' instead, which should avoid the bug
as well.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
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