doveadm import with subfolder oddity

[Mark Moseley]

On Mon, Feb 4, 2019 at 1:59 PM Mark Moseley <moseleymark at gmail.com> wrote:

> This has got to be something weird in my config. And the standard
> disclaimer of '"happy to post doveconf -n, but wanted to see if this is
> normal first" :)
>
> Background: Ubuntu Xenial, running 2.2.36. Mailbox type is mdbox and I've
> got a period separator in my inbox namespace:
>
> namespace {
>   hidden = no
>   inbox = yes
>   list = yes
>   location =
>   mailbox Spam {
>     auto = no
>     autoexpunge = 1 weeks
>     special_use = \Junk
>   }
>   mailbox Trash {
>     auto = no
>     special_use = \Trash
>   }
>   prefix = INBOX.
>   separator = .
>   subscriptions = yes
>   type = private
> }
>
> If I do a import for a regular folder under INBOX, it works just fine:
>
> doveadm import -u testbox2 at testing.local -U testbox1 at testing.local
> mdbox:~/mdbox INBOX all mailbox Sent
>
> ... returns happily, message count gets incremented
>
> If I try to do the same with a subfolder (and a subfolder that most
> definitely exists on both source and destination side), I get an error:
>
> doveadm import -u testbox2 at testing.local -U testbox1 at testing.local
> mdbox:~/mdbox INBOX all mailbox Sub.Sub1
> doveadm(testbox2 at testing.local): Error: remote(10.1.17.98:4000): Mailbox
> Sub.Sub1: Mailbox sync failed: Mailbox doesn't exist: Sub.Sub1
>
> If I use / instead of . in my query, it works:
>
> doveadm import -u testbox2 at testing.local -U testbox1 at testing.local
> mdbox:~/mdbox INBOX all mailbox Sub/Sub1
>
> ... returns happily and message count gets incremented.
>
> Since we're using '.' as our separator, that was a bit unexpected :)
>
> Ironically, if I'm doing a IMAPc 'import', it works just fine with a query
> of 'all mailbox Sub.Sub1'. It's only when importing from a local src and
> local dest (i.e. source_location == mdbox:~/mdbox) that it fails. With
> source_location set to 'imapc:', it works. I imagine that's due to using
> straight IMAP on the source side.
>
> Likely a misconfig on my part? Expected behavior?
>
> I can see in the strace that the error is triggered when doveadm is
> looking at the source mailbox. It looks
> for mdbox/mailboxes/Sub.Sub1/dbox-Mails first, then falls back
> to mdbox/mailboxes/Sub/Sub1/dbox-Mails (which it finds). Then a little bit
> later in the strace, it again looks for mdbox/mailboxes/Sub.Sub1/dbox-Mails
> (which it doesn't find) but doesn't try mdbox/mailboxes/Sub/Sub1/dbox-Mails
> this time, and then spits out 'Mailbox Sub.Sub1: Mailbox sync failed:
> Mailbox doesn't exist: Sub.Sub1'. With a query of 'all mailbox Sub/Sub1',
> the stat() is for mdbox/mailboxes/Sub/Sub1/dbox-Mails which it finds and
> uses happily.
>
> Having to substitute the '.'s for '/'s in the 'mailbox' part of the query
> isn't an awful workaround, but it very much feels like I'm doing something
> wrong. This is a production setup, so everything else is otherwise working
> fine. But I've only just begun working with 'doveadm import', so I might be
> turning up some issues with my config.
>
> Thanks! Sorry I'm so verbose :)
>

Has anyone else seen similar behavior? It's hardly a tough kludge to regex
's/\./\//g' (even if it makes for an ugly regex), but it seems like
something's not quite right.
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