[Owncloud] Possible fix for endless redirects on IIS from OC v3.0 to v4.0

[Dr. Hirn]

Hi,

I'm not used to PHP but tried to get an easy fix for the problem, that
unconfigured OwnCloud is endlessly redirecting when installed on IIS.
Problem is in /lib/base.php on line 202 (in v4.0.0):

if (!OC_Config::getValue('installed', false) && OC::$SUBURI !=
'/index.php') {

On an Microsoft OS, $SUBURI will never be /index.php. It will be
\index.php. Backslash instead of slash.

I thought about another way to define $SUBURI and tried some possibilites.
But somehow I think, the following is the easiest way to solve it.
I changed
OC::$SUBURI=substr(realpath($_SERVER["SCRIPT_FILENAME"]),strlen(OC::$SERVERROOT));
to
OC::$SUBURI=substr(realpath($_SERVER["SCRIPT_FILENAME"]),strlen(OC::$SERVERROOT)+1);
to eleminate the slash.

And then changed
if (!OC_Config::getValue('installed', false) && OC::$SUBURI !=
'/index.php') {
to
if (!OC_Config::getValue('installed', false) && OC::$SUBURI != 'index.php')
{

What do you think of this?

Stefan
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