dovecot - Oct 2014 - Replication .dovecot-sync.lock

Hello all,
I have set up two servers with dovecot and replication. The mail location is
mail_location = sdbox:/var/spool/mail/%u
Everything works fine when I override the homedirectories
userdb {
  driver = passwd
  override_fields = home=/var/spool/mail/%u
}
But, when I do not override the homedirectories, replication does not work,
and the following error is logged:
Oct 24 14:40:45 dsync-local(hans): Error: Couldn't create lock
/afs/mpa/home/hans/.dovecot-sync.lock: Permission denied

With a self-written module an IMAP user can get access to his homedirectory:
protocol imap {
  mail_plugins = afsToken
}
The user has to type in his password. Obviously this does not work for
replication.
Is there a way to specify a different location for the lockfile?
Isn't better to use the maildirectory but the homedirectory?
Is there a way to set the homedirectory differently for replication?

Thank you for any help.
HW

-- 
Hans-Werner Paulsen		hans at MPA-Garching.MPG.DE
MPI f?r Astrophysik		Tel 089-30000-2602
Karl-Schwarzschild-Str. 1	Fax 089-30000-2235	
D-85741 Garching

On 24 Oct 2014, at 06:16, Hans-Werner Paulsen <hans at
MPA-Garching.MPG.DE> wrote:
> Hello all,
> I have set up two servers with dovecot and replication. The mail location
is
> mail_location = sdbox:/var/spool/mail/%u
> Everything works fine when I override the homedirectories
> userdb {
>  driver = passwd
>  override_fields = home=/var/spool/mail/%u
> }
> But, when I do not override the homedirectories, replication does not work,
> and the following error is logged:
> Oct 24 14:40:45 dsync-local(hans): Error: Couldn't create lock
/afs/mpa/home/hans/.dovecot-sync.lock: Permission denied
> 
> With a self-written module an IMAP user can get access to his
homedirectory:
> protocol imap {
>  mail_plugins = afsToken
> }
> The user has to type in his password. Obviously this does not work for
> replication.
> Is there a way to specify a different location for the lockfile?
> Isn't better to use the maildirectory but the homedirectory?
> Is there a way to set the homedirectory differently for replication?
Is there anything in the user's real home directory that Dovecot needs?
Dovecot expects to be able to write there. It's not just replicator,
it's also if you use LDA/LMTP it writes .dovecot.lda-dupes files in there.
http://wiki2.dovecot.org/VirtualUsers/Home