File-dictionary based quotas and SETQUOTA

[Ganael Laplanche]

Hello,

I am trying to set up file-dictionary based quotas while supporting the 
SETQUOTA IMAP command.

I am using the following configuration :

----
plugin {
  quota = dict:User quota::file:%h/Maildir/dovecot-quota
  quota_set = dict:file:%h/Maildir/dovecot-quota
}
----

which enables correct quota accounting + setting through SETQUOTA.

A user's dovecot-quota file ends with the following contents :

----
priv/quota/limit/storage
5242880
priv/quota/limit/messages
20
priv/quota/messages
1
priv/quota/storage
8506282
----

which shows a correct accounting (1 mail received, ~8MB used) and correct 
setting after having used the following IMAP command through a master user :

A2 SETQUOTA "User quota" (STORAGE 5242880 MESSAGE 20)

*But* the problem is that I am unable to fetch the limits and consume them 
from userdb (as a consequence, the limits are never applied).

On the consuming side, I am using a dictionary userdb to try to fetch the 
'priv/quota/limit/storage' value from the file but it does not work because 
the key is never found.

Here is my configuration :

----
userdb {
  driver = dict
  args = /etc/dovecot/dovecot-dict-quota.conf.ext
}
----

and my dovecot-dict-quota.conf.ext file :

----
uri = file:%h/Maildir/dovecot-quota
iterate_disable = yes

key quota {
  key = priv/quota/limit/storage
  default_value = 100
}

userdb_fields {
  quota_rule = *:storage=%{dict:quota}
}
----

If I try to fetch the quota for that user :

# doveadm quota get -u ganael.laplanche at centralesupelec.fr
Quota name Type    Value Limit                                                                                                                          
%
User quota STORAGE  8307   100                                                                                                                       
8307
User quota MESSAGE     1     -                                                                                                                          
0

the default rule is returned (100). The logs show :

May 16 12:02:45 mailhost1-saclay dovecot: auth-worker(12899): Debug: 
dict(Ganael.Laplanche at centralesupelec.fr): Lookup: shared/priv/quota/limit/
storage not found, using default value 100

We can see that the default quota rule has been applied because the key is not 
found. The problem is that a "shared/" prefix is always prepended when looking 
for the key I configured (priv/quota/limit/storage).

If I test the dictionary manually, the key is found :

# doveadm dict get -u ganael.laplanche at centralesupelec.fr "file:/var/vmail/l/
laplanche_gan/Maildir/dovecot-quota" priv/quota/limit/storage
5242880

Does anyone know how to prevent Dovecot from adding that prefix and make it 
fetch the correct value from userdb ?

Best regards,

-- 
Ganael Laplanche <ganael.laplanche at centralesupelec.fr>
Unix Systems Engineer @CentraleSupelec Rennes