[TYPO3-core] RFC: #10322: Send Notification if BE is locked

[Steffen Kamper]

Hi,

This is SVN patch request.

Type: Feature

Branches: trunk

BT reference: http://bugs.typo3.org/view.php?id=10322

One of the latest additions is the possibility to lock the BE for 
maintainance. This is done by creating the file
typo3conf/LOCK_BACKEND

If the file is present, init.php will die with the locked message.
This only happens if you click anywhere in BE.

The attached patch looks for the file in login-timout-routine which is 
called every 2 minutes. If BE is locked you will see a message box, see 
screenshot

vg Steffen
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