Converting mailboxes to UTF-8

[Артем Перекресний]

2016-07-25 1:08 GMT+03:00 Timo Sirainen <tss at iki.fi>:

> On 23 Jul 2016, at 13:44, Артем Перекресний <kondybas at gmail.com> wrote:
> > Is any proven routine to migrate mailboxes from mUTF-7 to UTF-8 encoding?
> ​For what purpose? By default Dovecot assumes that mailboxes are mUTF-7 on
> filesystem.​
>
>
​​Main idea is to convert FS directories names of the inherited dovecot's v
1.x hierarcy from the mUTF-7 to the readable UTF-8 format​. It's too dizzy
to work with directories like .INBOX.&BDYESwRA-.&BE8ENARK-. Also logs are
look weird.


> I don't think there's any especially easy way to do that. You'd need to
> write a script that properly goes through the hierarchies and does the
> renaming.
>

Here is the quick solution:​ we have to list mailbox names in the reverse
alnum order to be sure nested subdirs will be renamed prior to the upper
level ​ones:

​#!/bin/sh
doveadm mailbox list -8 -A | sort -r | while read user utf7
do
  utf8=$( doveadm mailbox mutf7 -7 "$utf7" )
  [ $utf7 != $utf8 ] && doveadm mailbox rename -u $user -s "$utf7" "$utf8"
done
####
​
1. Stop dovecot
2. Add the "UTF-8" key to the `mail_location = maildir:/path/:UTF-8`
3. Start dovecot. Now all old folders will be shown as plain mUFT7-encoded
strings (subscriptions stay correct)
4. Run the script above

​In my case managesieve is already configured to use UTF-8 for sieve rules
​so no additional conversion needed. But if mUTF-7 is used for sieve files
`doveadm mailbox mutf7` can be used for conversion.

​Artem​