Review Request 123857: Fix crash after a user has launched kbuildsycoca as root.

[David Edmundson]

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https://git.reviewboard.kde.org/r/123857/
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Review request for KDE Frameworks.


Repository: kservice


Description
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3 commits fixing; a crash, what caused the crash, and why we weren't auto recovering from it.

QFile::open() will return a Read/Write error on failed access,
PermissionsError is only in the result of a setPermissions call.

CCBUG: 342438

Don't write kbuildsycoca cache files as root

$HOME is often preserved as root, making us write cache files in the
user's home directory. People shouldn't be running apps as root anyway.

CCBUG: 342438

Guard against being unable to open stream

This can happen if we are unable to open the database when a
notifyDatabaseChanged signal is emitted.
Other places guard also against this eventuality.

BUG: 342438


Diffs
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  src/kbuildsycoca/kbuildsycoca.cpp d14f1f950cdb0d8c9fefbce2a4740f211d3d97a1 
  src/services/kservicegroupfactory.cpp 8cfc6c6670d3b87e8ed6bdfe4aeac947846afc18 

Diff: https://git.reviewboard.kde.org/r/123857/diff/


Testing
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Thanks,

David Edmundson

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