[Dovecot] overriding userdb connection host for doveadm-user

[Micah Anderson]

I've got my users in a replicated database setup and dovecot configured
with two connect lines in dovecot-sql.conf:

connect = host=127.0.0.1 port=3306 dbname=users user=user password=pass
connect = host=127.0.0.2 port=3306 dbname=users user=user password=pass

this works really well to help balance the load. 

However, when a new user is created, the replication information
sometimes has not made it to the slave database before my user creation
process tries to send that new user an email about their new email
account. If it hasn't and the email gets sent, then it bounces because
postfix thinks the user doesn't exist yet. 

Replication usually happens within seconds, but could be delayed due to
problems.

I would like a way to see if the new user's information has been
replicated yet before sending the email. I was thinking I could use
'doveadm user' to lookup the user, but I am not sure that I can specify
one of the specific 'connect' lines in my configuration to check. Is
there a way to override that configuration variable to do this test? I
tried various incarnations of passing '-o connect=host='... but doveadm
user would just ignore them.

thanks for any suggestions!
micah

ps - yes, I can make my user creation process just 'sleep' for an
arbitrary amount of time and by that time the replication should have
occured, but that is a bit of a shot in the dark, and doesn't handle
longer replication delays that could potentially happen.

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