dsync: loss of keywords in 2.2.13

[Benoit Branciard]

After some tests, we found that "dsync backup" sometimes fails to copy 
all the IMAP "keywords" (labels) from the source mailbox to the backup one.

Our Dovecot version is 2.2.13 (Debian Jessie package 1:2.2.13-12~deb8u1).

We are migrating mailboxes from MBOX (with separate indexes) to MDBOX 
(with custom DIRNAME) format.

The source mail_location is:
mail_location = 
mbox:~/mail:INBOX=~/mail/INBOX:INDEX=/var/cache/dovecot/indexes/%16Hu/%u

and the target:
mail_location = mdbox:~/mdbox:DIRNAME=_@@_dbox-Mails_@@_

and we use the following dsync command to replicate (twice, a first 
"hot" run, and a second "cold" run with lda and user kicked off).

dsync -o mail_access_groups=$mgroup -u "$login" backup 
"mdbox:$mdbhome/mdbox:DIRNAME=_@@_dbox-Mails_@@_"

where $login is username, $mgroup is an UNIX group which has write 
access to the (temporary chowned/chmoded) mailbox, and $mdbhome is the 
new (MDBOX) user's home.

It appears that some keywords get replicated, but some other do not.

The only workaroud we found is to backup all keywords with "doveadm 
fetch 'mailbox uid flags' keywords '*'", an restore them on the new 
mailbox with "doveadm flags add". This solution yields no keyword loss.


has this problem already been addressed ?



-- 
Benoit BRANCIARD
Service InfraStructures (SIS)
Direction du Système d'Information et des Usages Numériques (DSIUN)
Université Paris 1 Panthéon-Sorbonne
Centre Pierre Mendès France
90 rue de Tolbiac - 75634 Paris cedex 13 - France
Bur. B406 - Tél +33 1 44 07 89 68 - Fax +33 1 44 07 89 66
Accueil: +33 1 44 07 89 65 - Assistance-DSIUN at univ-paris1.fr
http://dsi.univ-paris1.fr