Review Request: Fix KConfigIniBackend::isWritable() when the parent directory doesn't exist

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This review has been submitted with commit f8f07161e04f8ffececade97e8deaef7385dbaec by David Faure to branch KDE/4.8.

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On Dec. 30, 2011, 2:44 a.m., Anssi Hannula wrote:
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> (Updated Dec. 30, 2011, 2:44 a.m.)
> 
> 
> Review request for kdelibs.
> 
> 
> Description
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> 
> KConfigIniBackend::isWritable() tries to handle cases where the config
> file doesn't exist and one or more of the deepest directories don't
> exist either, in which case 'true' is returned if the deepest directory
> is writable.
> 
> However, this fails because the code tries to use QDir::cdUp() to go
> upwards until an existing directory is found. As per documentation,
> cdUp() will fail when the parent directory doesn't exist, causing
> isWritable() to bail out and return false without checking further
> parent directories.
> 
> This will cause e.g. KConfig::accessMode() to return ReadOnly if the
> configuration directory structure doesn't exist yet, even if the KConfig
> is actually writeable (the parent directories are automatically created
> by KConfigIniBackend at writing time). This was observed at
> https://bugs.mageia.org/show_bug.cgi?id=3601#c10
> 
> Fix that by walking through the tree using QFileInfo::absolutePath()
> instead.
> 
> 
> Diffs
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> 
>   kdecore/config/kconfigini.cpp 5f7ba7c 
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> Diff: http://git.reviewboard.kde.org/r/103577/diff/diff
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> 
> Testing
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> 
> Built kdelibs 4.7.95 with the patch, the error message in the referenced Mageia bugreport comment (which is shown when accessMode() returns ReadOnly) doesn't show up anymore when the ~/.kde4 directory tree doesn't exist. Also, if I create an empty ~/.kde4 dir without any permissions, the accessMode() call still returns ReadOnly as expected.
> 
> 
> Thanks,
> 
> Anssi Hannula
> 
>

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