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Bug #53128 Gettext + NFS + atomic file replace = not handled
Submitted: 2010-10-21 14:11 UTC Modified: 2021-01-25 12:16 UTC
From: skygreg at gmail dot com Assigned: cmb (profile)
Status: Not a bug Package: Gettext related
PHP Version: 5.3.3 OS: Linux 2.6.35
Private report: No CVE-ID: None
 [2010-10-21 14:11 UTC] skygreg at gmail dot com
Description:
------------
Hi,

I'm facing a bug related to Gettext, Apache2 and mod_php, a NFS mount point and atomic .mo file creation.

This problem doesn't occur on local file system, or while overwriting .mo files.

How to reproduce : put your gettext files (.mo) on a NFS share, change the translated phrase and format them using a temporary file, to be an atomic change :
msgfmt -o /tmp/messages.mo /var/local/medias/small/data/test_gettext/en_GB/LC_MESSAGES/messages.po && mv /tmp/messages.mo /var/local/medias/small/data/test_gettext/en_GB/LC_MESSAGES/messages.mo

I have to use atomic change, cause it is a high loaded server and if I didn't do that, the new .mo file is partially read and cached, so I got partially translated phrases.





Test script:
---------------
<?php
$locale = 'en_GB';
$langue = substr($_GET['locale'], 0, 2);
//$bdpath = dirname($_SERVER['SCRIPT_FILENAME']);
$bdpath = '/var/local/medias/small/data/test_gettext'; // NFS mount point
bindtextdomain('messages', $bdpath);
textdomain('messages');
bind_textdomain_codeset('messages', 'UTF-8');
$local = setlocale ( LC_MESSAGES ,  $locale . '.utf8' );
putenv ( "LANG=" . $locale );
putenv ( "LANGUAGE=" . $locale );
$st = stat($bdpath."/".$locale."/LC_MESSAGES/messages.mo");
echo date("H:i:s")." inode: ".$st[1]." mtime: ".$st[8]." text: "._("bonjour le monde")."\n";

Expected result:
----------------
HELLO WORLD


Actual result:
--------------
// if I rm the .mo files, some apache2 process display :
bonjour le monde
// else, I got the old phrase :
hello world

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 [2021-01-25 12:16 UTC] cmb@php.net
-Status: Open +Status: Not a bug -Assigned To: +Assigned To: cmb
 [2021-01-25 12:16 UTC] cmb@php.net
PHP does not reset libintl on request shutdown (besides that, to
my knowledge, that is not even possible, it would be bad for
production).  That implies that translations may be cached by
libintl, and these translations may be returned on the next
request.  If in some cases changed translations are read, but not
in others, that is not a PHP issue, but rather an upstream issue,
if at all.
 
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