[Bug 155910] New: mail folder management: old contents blocks changes (major; potential data loss)

[Maciej Pilichowski]

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http://bugs.kde.org/show_bug.cgi?id=155910         
           Summary: mail folder management: old contents blocks changes
                    (major; potential data loss)
           Product: kmail
           Version: unspecified
          Platform: SuSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs kde org
        ReportedBy: bluedzins wp pl


Version:            (using KDE 3.5.8)
Installed from:    SuSE RPMs

This bug is serious however if user won't panic it is possible to recover from KMail error.

Let's say we have A folder with B, C, D subfolder. We work for a while, KMail stores some data, like indices for those subfolders. Then we delete D.

Some time later we create _A folder with B and C, we move all from B and from C (to B and C in _A). Delete A, rename _A to A.

KMail restart and... B and C are gone. What happened? There was some date about D not deleted from A (on the disk) so A was deleted from KMail but not from disk. Since it was not deleted, rename _A -> A was possible but without B and C (they left in _A structure).

So there are several bugs here:
* KMail keeps some leftovers from deleted subfolders
* KMail does not check if rename is possible
* KMail does not warn about problems with rename
* KMail does not check the integrity of the data (on start at least)

Workaround:
* do not panic
* quit KMail
* find A directory in KMail (on disk)
* delete it
* rename _A directory (containing B and C) to A
* run KMail -- you should be able to see correct A folder with B and C subfolders