dovecot - Feb 2013 - dsync 2.1.10 does not correctly handle renames of mailbox subtrees

Hi,

It seems that dsync 2.1.10 does not correctly handle renames of mailbox
subtrees. The scenario is as follows.

There are two servers, A and B, both running dovecot 2.1.10 and configured
to use mdbox. Automatic replication between them is disabled, ie.
replication plugin is not active and replicator service
has process_min_avail = 0. I perform the following actions:

1. On A: doveadm mailbox create -u test_user a a/b a/b/c d
2. On A: doveadm sync -u test_user -d

The result is as expected: on both A and B there are a/b/c and d mailboxes.

Now I connect to A via IMAP and rename a/b to d/b. The result is as
expected: on A there are a and d/b/c mailboxes. Next I execute on A
'doveadm sync -u mailstoragetest -d' and now the result is not as
expected:
there are a/b/c and d/b subtrees on both A and B and a/b is just a
directory, ie. it does not contain dbox-Mails (the rest are proper
mailboxes).

dovecot.mailbox.logs have the following records appended to them:

A:
#2112: rename 33259783092361d18c60ba1c7cfe973c (2013-02-12 10:42:55) - this
probably is the rename of a/b to d/b (recursive, ie. including children -
in this case a/b/c => d/b/c) by the IMAP client
#2136: rename ee2be6da91ae879476b152d7ca041f1b (1970-01-01 01:00:00) -
rename of d/b/c to a/b/c by dsync (unexpected/incorrect)

B:
#1104: rename 33259783092361d18c60ba1c7cfe973c (1970-01-01 01:00:00) -
rename of a/b to d/b (non recursive) by dsync

What seems to be missing is the record in A's dovecot.mailbox.log
describing the rename of a/b/c to d/b/c (or in general case the set of
records describing the renames of all the children of a/b). Would appending
such records allow dsync to make correct decisions as to which mailboxes
and on which servers to rename?

Thanks for any help.

# 2.1.10: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-5-amd64 x86_64 Debian 6.0.1
auth_master_user_separator = *
auth_username_format = %Ln
default_vsz_limit = 2 G
dotlock_use_excl = no
dsync_remote_cmd = ssh -l%{login} %{host} doveadm dsync-server -u%u -l5
log_path = /var/log/dovecot.log
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_access_groups = mail
mail_location = mdbox:~/mdbox:ALT=/var/vmail/alt/%n
mail_plugins = acl
namespace inbox {
  inbox = yes
  location   mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix   separator = /
}
passdb {
  args = /etc/dovecot/dovecot-ldap.conf
  driver = ldap
}
plugin {
  acl = vfile
}
protocols = imap lmtp pop3
service aggregator {
  fifo_listener replication-notify-fifo {
    mode = 0666
  }
  unix_listener replication-notify {
    mode = 0666
  }
}
service auth {
  executable = /usr/lib/dovecot/auth
  unix_listener auth-client {
    mode = 0660
  }
  unix_listener auth-master {
    mode = 0600
  }
  unix_listener auth-userdb {
    mode = 0666
  }
  user = root
}
service dict {
  unix_listener dict {
    mode = 0666
  }
}
service doveadm {
  process_min_avail = 1
  service_count = 1024
}
service imap-login {
  chroot = login
  executable = /usr/lib/dovecot/imap-login
  inet_listener imap {
    address = *
    port = 143
  }
  service_count = 0
  user = dovecot
}
service imap {
  executable = /usr/lib/dovecot/imap
}
service lmtp {
  inet_listener lmtp {
    port = 24
  }
  process_limit = 48
}
service pop3-login {
  chroot = login
  executable = /usr/lib/dovecot/pop3-login
  inet_listener pop3 {
    address = *
    port = 110
  }
  service_count = 0
  user = dovecot
}
service pop3 {
  executable = /usr/lib/dovecot/pop3
}
ssl = no
userdb {
  args = /etc/dovecot/dovecot-ldap.conf
  driver = ldap
}
protocol imap {
  imap_client_workarounds = tb-extra-mailbox-sep
  mail_plugins = acl
}
protocol lmtp {
  mail_plugins = acl
}
protocol pop3 {
  pop3_uidl_format = %08Xu%08Xv
}
protocol lda {
  mail_plugins = acl
}

-- 
Karol Jurak

On 12.2.2013, at 11.19, Karol Jurak <karol.jurak at gmail.com> wrote:
> It seems that dsync 2.1.10 does not correctly handle renames of mailbox
> subtrees. The scenario is as follows.
I'm hoping I won't have to fix this in v2.1. v2.2 has a redesigned dsync
where rename syncing should work much better.