dovecot - Aug 2014 - preserving flags for shared mailbox when migrating from cyrus to dovecot

Dear all,

Despite all the progress we are making in our attempt to make the
migration as smooth and transparent for our users there are still some
important unsolved issues.  One thing that I can't figure out is how to
preserve a user's flags that s/he has for mail in a shared mailbox.

So far we tried 'doveadm backup -R' as well as the cyrus2dovecot script
from here [1].  Both work well for individual mailboxes but do not
migrate subscriptions for shared mailboxes and -- more importantly --
flags for mail in a shared mailbox.  Reconstructing subscriptions is
quite easy but I have no clue on how to reconstruct a user's flags.

Any hint is greatly appreciated!

[1]  http://cyrus2dovecot.sw.fu-berlin.de/index.html
-- 
j.hofm?ller

mur.sat -- a space art project                        http://sat.mur.at/

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On 20 Aug 2014, at 13:39, Jogi Hofm?ller <jogi at mur.at> wrote:
> Despite all the progress we are making in our attempt to make the
> migration as smooth and transparent for our users there are still some
> important unsolved issues.  One thing that I can't figure out is how to
> preserve a user's flags that s/he has for mail in a shared mailbox.
> 
> So far we tried 'doveadm backup -R' as well as the cyrus2dovecot
script
> from here [1].  Both work well for individual mailboxes but do not
> migrate subscriptions for shared mailboxes and -- more importantly --
> flags for mail in a shared mailbox.  Reconstructing subscriptions is
> quite easy but I have no clue on how to reconstruct a user's flags.
I think you can first migrate the shared mailbox's mails as whatever user.
Then use doveadm sync -1 (and maybe -m shared/foo to sync only the one mailbox)
to migrate the message flags. You need to run that separately for all the users
who have access to the shared mailbox. Of course Dovecot will also need to be
configured properly to have private seen flags for users (only private seen
flags are currently possible in Dovecot, I'm not sure how they are in
Cyrus).