[TYPO3-core] RFC #11433: touch(): Utime failed in install tool

[Steffen Gebert]

Hi,

This is a SVN patch request

Type: Bugfix

Branches: 4_1, 4_2, trunk

Bugtracker reference:
http://bugs.typo3.org/view.php?id=11433

Problem:
Install tool always touches the ENABLE_INSTALL_TOOL file to update its  
utime.
If the web server user has no right to do so, this fails with a nasty PHP  
warning.

Solution:
Check, if the file is really writable before touching it.

Note:
As discussed in the bug tracker, the hints of a locked install tool are  
not the best. Those words should be optimized in another RFC.
Also, I know it's not as desired to create this file using a shell, but  
some people have this habit - me included.
So suppress the error message in this case.

Regards
Steffen
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