Tamas Hegedus, 29.01.19:
* Configuration uses mail_location = mbox:~/mails
* setup per-user mail location and do for each user individually in a
serial manner:
-- doveadm sync maildir:~/Maildir; mbox is synced to Maildir, long running
time
[1]
-- doveadm sync maildir:~/Maildir; rerun to do it for new messages (fast)
-- add USER to userdb and set extra field to maildir:~/Maildir
users not present in the userdb should default to dovcot default;
[2]
the conditionally optional: doveadm auth cache flush
More or less how I would plan a migration, but to be fanatically safe
and avoiding race conditions where a user could be manipulating their
mailbox or new having mail delivered, I would put some service mutex
between [1] and [2].
By that I mean at [1]
a) tempfail any incoming mail for that user; and
b) kick the user off IMAP/POP and make sure they can't log back
in during the final synching. (Add them to separate deny userdb?)
After the final sync [2], undo these steps.
Joseph Tam <[email protected]>
