doveadm/dsync/imapc loose folder subscriptions

[Peer Heinlein]

As I already wrote some days ago we're actually running a huge migration
using doveadm/dsync-backup/imapc:

doveadm -o imapc_user="$UNAME1"  -o imapc_password="$PWORD1"  -o
imapc_host=$SERVER1 -o pop3c_user="$UNAME1" -o pop3c_password="$PWORD1"
-o pop3c_host=$SERVER1 -D -v backup -R -u "$UNAME2" imapc:

We just noticed that doveadm looses changes in folder subscriptions if a
folder is copied again.

a) Copy a mdbox-home of a user  (using doveadm backup...)

b) Change his subscriptions on the source-side OR change his subscripts
on the destination-side OR delete his subscriptions-file.

c) Copy that mdbox-home from that user again (using doveadm backup...)

doveadm will copy & merge his mails, but he does NOT check for changes
in folder subscriptions. As you can see in the attached logs, doveadm
nitices changes in subscriptions:

dsync(p100490p11): Debug: brain S: Local mailbox tree: INBOX.Trash
guid=b36f688eae08506001091708006abe5a uid_validity=1368084367
uid_next=1206 subs=yes last_change=0 last_subs=0

dsync(p100490p11): Debug: brain M: Local mailbox tree: INBOX.Trash
guid=b36f688eae08506001091708006abe5a uid_validity=1368084367
uid_next=1206 subs=no last_change=1448903088 last_subs=1448177531

but doesn't fix the subscriptions list:

dsync(p100490p11): Debug: brain M: Mailbox INBOX.Trash:
local=b36f688eae08506001091708006abe5a/1448903088/1,
remote=b36f688eae08506001091708006abe5a/0/1: Mailboxes are equal

Even a deletion of the subscriptions file doesn't work. doveadm does not
create a new subscription file.

This bug is heavy, because incremental backups made by doveadm backup
aren't complete and reliable any more.

Our biggest problem ist, that we changed the folder prefix and doveadm
does change the folder names, but not the subscriptions. So we have
several hundred thousand users with broken subscriptions (yes, sed can
fix this, I know, but also we'd kill changes made by users during
migration period).

Peer



-- 
Heinlein Support GmbH
Schwedter Str. 8/9b, 10119 Berlin

http://www.heinlein-support.de

Tel: 030 / 405051-42
Fax: 030 / 405051-19

Zwangsangaben lt. §35a GmbHG: HRB 93818 B / Amtsgericht
Berlin-Charlottenburg,
Geschäftsführer: Peer Heinlein -- Sitz: Berlin