[TYPO3-core] RFC: Bug #9977: Extensions' class.ext_update.php scripts are executed even when extension isn't loaded

[Marcus Krause]

Hi!

This is an SVN patch request.

Type: bug

Branches: 4.1, 4.2, trunk

Bugtracker reference: http://bugs.typo3.org/view.php?id=9977


Problem:
Extensions' scripts class.ext_update.php are used to update data when 
newly installing an extension or upgrading an existing one.

Unfortunately class.ext_update.php is even executed if the extension 
isn't loaded at all. This is unneccessary and most probably causes an 
error as class.ext_update.php in most cases will use the extension's API 
and therefore depends on a loaded extension.


Solution:
Test, if according extension is loaded before executing 
class.ext_update.php.


Notes:
Patch has been made against 4.2 branch.

Marcus.
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