[TYPO3-core] RFC: Bug #8260: Update Wizard in install tool force temp-configuration files and load configuration twice

[Oliver Hader]

Hi,

Am 03.09.10 15:56, schrieb Oliver Hader:
> This is a SVN patch request.
> 
> Type: Bugfix
> 
> Bugtracker references:
> http://bugs.typo3.org/view.php?id=8260
> 
> Branches: TYPO3_4-2, TYPO3_4-3, TYPO3_4-4, Trunk
> 
> Problem:
> Imagine the situation that you have an extension installed that defines
> PHP classes or includes class files in ext_localconf.php or ext_tables.php.
> If you now try to update a TYPO3 installation by running the update
> wizard in the install tool, you'll run into a PHP fatal error like:
> "PHP Fatal error: Cannot redeclare class tx_whatever_xyz"
> The reason is that the update wizard removes existing temp_CACHED_*.php
> files, regenerates them and loads them another time just to make sure
> that the uncached versions of ext_localconf.php and ext_tables.php are
> used. The result is, that PHP classes will be defined twice with causes
> the accordant PHP fatal error.
> 
> Solution:
> Whenever the install tool is used, the ext_localconf.php and
> ext_tables.php files must not be taken from the cached files - this is
> done by listening for the constant "TYPO3_enterInstallScript".
> Besides that the cached files still must be removed when using the
> update wizard since it could happen that new extensions will be
> installed and caches need to be cleared.
> 
> Notes:
> You can test the behaviour the attached extension that includes a PHP
> class file in ext_localconf.php. Add the following to your localconf.php
> file (or set it by using the install tool):
> $TYPO3_CONF_VARS['EXT']['extCache'] = 0;
> 
> Without having the patches applied, you should get the PHP fatal error
> when using the update wizard in the install tool.

This RFC now has enough positive votes on reading and testing, thus I'm
going to commit it later on. Introducing new constants as Helmut
suggested will be handled in a separate RFC then.

olly
-- 
Oliver Hader
TYPO3 v4 Core Team Leader