[Akonadi] [Bug 345337] New: akonadi chokes on empty mails

[m.eik michalke]

https://bugs.kde.org/show_bug.cgi?id=345337

            Bug ID: 345337
           Summary: akonadi chokes on empty mails
           Product: Akonadi
           Version: 1.13.0
          Platform: Kubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Maildir Resource
          Assignee: kdepim-bugs at kde.org
          Reporter: m at reaktanz.de

i'm currently in recovery from akonadi all of a sudden forgetting about all my
local mails (see bug #345211 ). as i was trying to import those mails from
backups and then moving the imported folder, some folders couldn't be moved,
the error message read "unable to retrieve item from resource: invalid entry".

i investigated the problem and found that the error was triggered by certain
mails in the respective folder which did not have a mail body any more, only
the header was still there. in one folder this was the case for about 40
"normal" mails, while in all other folders this has exclusievly happened to
unsubscribe confirmation mails from various mailing list servers. the mails
were identifiable because kmail shows an error message in its status bar when
selecting one of them. i was able to move all intact mails and then removing
the folder containing only invalid mails.

the main question is where those empty mails came from. this was an archive
with mails from the part 15 years, but the most disturbing finding (normal
mails without body) were from around 2012-2014. it was all mails that were
transfered by kmail from IMAP to a local maildir resource. the data loss most
likely happened then.

Reproducible: Didn't try

Steps to Reproduce:
well, this is hard to reproduce. but you might be "lucky" if you manually
remove mail bodies from a maildir archive, import the archive with kmail and
then try to move the imported folder.

Actual Results:  
folder cannot be moved, a rather cryptic error message is shown. if broken
mails are identified, they cannot be deleted -- you have to move all other
mails  to another folder and then delete the folder containing the invalid
mails.

Expected Results:  
at the very least, the error message should explain *why* you cannot move the
folder. in addition, it shouldn't be such a painful excercise to identify the
broken mails; kmail/akonadi should list the items in question. and once they're
found, it should be possible to delete them.

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