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Message-ID: <d8269d910705030228s357e52b7tffd5cfa970061f7c@mail.gmail.com>
Date: Thu, 3 May 2007 11:28:12 +0200
To: "Arnold Daniels" <info@adaniels.nl>
Cc: internals@lists.php.net
In-Reply-To: <4638E608.2090202@adaniels.nl>
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References: <4638E608.2090202@adaniels.nl>
Subject: Re: [PHP-DEV] How to find a bug: is_link troubles
From: tijnema@gmail.com ("Tijnema !")

On 5/2/07, Arnold Daniels <info@adaniels.nl> wrote:
> Hi,
>
> I've got a bug with is_link and lstats. Any symlinks not created in the
> current session, will not be read. This only occurs in the Apache 2 SAPI
> version, not in the CLI version.
>
> Script:
> <?
>     $symlink = '/tmp/link-test';
>     if (file_exists($symlink)) unlink($symlink);
>     symlink('/tmp/pear', $symlink);
>     echo (file_exists($symlink) ? is_link($symlink) ? "Correct" : "ERROR" :
> "Couldn't create the link"), "<br/>\n";
>
>     $symlink = '/tmp/link-persist';
>     if (!file_exists($symlink)) symlink('/tmp/pear', $symlink);
>     echo (file_exists($symlink) ? is_link($symlink) ? "Correct" : "ERROR" :
> "Couldn't create the link"), "<br/>\n";
> ?>
>
> First run:
>     Correct
>     Correct
>
> Second run:
>     Correct
>     ERROR
>
> Next runs:
>     Correct
>     ERROR
>
> I've recently start using the daily snapshots op PHP, but I also tried it on
> version 5.2.1, which shows the same result. It used to work just fine, so
> I'm sure this isn't the expected result. I've recently upgraded from Ubuntu
> Edgy (6.10) to Feisty (7.04), with kernel and apache update, so I believe
> that the problem is related to that.
>
> I've straced the process (see attachment), but I can't pinpoint the problem.
> This is a big issue for me, can anyone point me in the right direction to
> find the source of this problem.
>
> Thanks,
> Arnold
>
<snip>

Well, I've also tested this code, and it does work fine. BUT if
/tmp/pear doesn't exists, what i had at first, then file_exists
returns false, because file_exists follows symlinks, and the symlink
pointed to nothing. So if you're sure that $symlink is a link, then it
might be better to check it with is_link.

Also, the is_link function is cached, so you might want to add one or
more clearstatcache() in your script.

I checked your strace also, but it doesn't look like there's a bug.
But I've never studied on the PHP core so....

Well, if above doesn't help you, then one of the "real experts" needs
to look at it :)

Tijnema