[kmail2] [Bug 389638] When moving imported maildir folders, before they are completely written to disk, they arrive empty, losing all the mails.

[Martin Steigerwald]

https://bugs.kde.org/show_bug.cgi?id=389638

--- Comment #5 from Martin Steigerwald  ---
Hmmm, okay, here it is about moving the folder before the import in the
background has finished. But yet also there, as a work-around, just moving it
in the filesystem should be faster. And it should safe, as it circumvents that
Akonadi first stuffes mail into the database and then puts them into the
destination location. It may confuse Akonadi at first, but I bet it will pick
up the move in the filesystem as it uses inotify to watch the maildir folders.

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[kmail2] [Bug 389638] When moving imported maildir folders, before they are completely written to disk, they arrive empty, losing all the mails.

[Martin Steigerwald]

https://bugs.kde.org/show_bug.cgi?id=389638

--- Comment #4 from Martin Steigerwald  ---
Ah, I missed to mention my current work around: I move the folder in the
filesystem and let Akonadi update the database. That still takes some time, but
on my system it is much, much faster than doing it within KMail and thus
Akonadi itself. More detail about this in the other bug report I mentioned.

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[kmail2] [Bug 389638] When moving imported maildir folders, before they are completely written to disk, they arrive empty, losing all the mails.

[Martin Steigerwald]

https://bugs.kde.org/show_bug.cgi?id=389638

Martin Steigerwald  changed:

   What|Removed |Added

 CC||mar...@lichtvoll.de

--- Comment #3 from Martin Steigerwald  ---
I think that may be related to

[Akonadi] [Bug 364114] New: moving a folder within one maildir resource is
extremely slow and inefficient

and thus

[Akonadi] Foreign payload
https://phabricator.kde.org/T630

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[kmail2] [Bug 389638] When moving imported maildir folders, before they are completely written to disk, they arrive empty, losing all the mails.

[quazgar]

https://bugs.kde.org/show_bug.cgi?id=389638

quazgar  changed:

   What|Removed |Added

  Component|composer|commands and actions
 Ever confirmed|0   |1
Summary|When moving several maildir |When moving imported
   |folders, some arrive empty, |maildir folders, before
   |losing all the mails.   |they are completely written
   ||to disk, they arrive empty,
   ||losing all the mails.
 Status|UNCONFIRMED |CONFIRMED

--- Comment #2 from quazgar  ---
OK, I think I can fully reproduce the problem now and have found its reason:

Steps to reproduce
--
1) Create a KMail archive, it should contain a folder ("somedir") and some
subfolders and sufficiently many emails (in my case, a total of 700 emails was
enough).
2) Create a target maildir directory, e.g. "target"
3) Import the archive into a folder, e.g. "imported"
4) Shortly after the import has finished, move the imported folders, e.g.
"imported/somedir" to "target".

Expected result
---
1) The moved folders should have an identical content compared to the archive's
source.

Actual result
-
1) Some, or all, of the emails are missing.

Workaround
--
1) Wait until the folder structure on the file system exists and has been
populated.  This can be checked e.g. by watching the output of:

find ~/.local/share/akonadi_maildir_resource_0/.imported.directory/ -type f |
wc -l

2) Only when the number looks reasonable and does not change any more, start
moving the folder.


Notes
-
Since in this case, the bug only happens after importing mails, maybe the
severity can be downgraded, because no data is lost as long as the archive is
still available and the problem has been noticed soon enough.

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