dovecot - Aug 2013 - Logging pre-rewrite user ID for application-specific passwords

I have set up Dovecot v2.2.5 with application-specific passwords, along the
lines of this blog post
(http://www.dgsiegel.net/news/2013_05_21-application_specific_passwords_for_dovecot).

My users file looks like:
user-foo:{BLF-CRYPT}$2...:42:42::/home/user::allow_nets=127.0.0.1/32 user=user
user-bar:{BLF-CRYPT}$2...:42:42::/home/user::user=user
user:{BLF-CRYPT}$2...:42:42::/home/user::nologin

In this way, user-foo can log in with one password (but only from localhost),
user-bar can log in from any host with a different password, but both actually
being treated as the same user.

When these users log in through, the log entries look like:
Aug 26 23:03:01 hostname dovecot: imap-login: Login: user=<user>,
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=12345, TLS

Whereas I would like to see the original user name (prior to the re-write), i.e.
user-foo and user-bar so I can keep track of which user names are in use and
from where.

Is there some way to do this? I couldn't see any of the variables being
suitable.

There is some information in the debug logs, but I would prefer not to need to
leave this on when I don't need them.

Thanks in advance.

Steven
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On 27.8.2013, at 1.08, Steven Murdoch <steven.murdoch at cl.cam.ac.uk>
wrote:
> I have set up Dovecot v2.2.5 with application-specific passwords, along the
lines of this blog post
(http://www.dgsiegel.net/news/2013_05_21-application_specific_passwords_for_dovecot).
> 
> My users file looks like:
> user-foo:{BLF-CRYPT}$2...:42:42::/home/user::allow_nets=127.0.0.1/32
user=user
> user-bar:{BLF-CRYPT}$2...:42:42::/home/user::user=user
> user:{BLF-CRYPT}$2...:42:42::/home/user::nologin
> 
> In this way, user-foo can log in with one password (but only from
localhost), user-bar can log in from any host with a different password, but
both actually being treated as the same user.
> 
> When these users log in through, the log entries look like:
> Aug 26 23:03:01 hostname dovecot: imap-login: Login: user=<user>,
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=12345, TLS
> 
> Whereas I would like to see the original user name (prior to the re-write),
i.e. user-foo and user-bar so I can keep track of which user names are in use
and from where.
> 
> Is there some way to do this? I couldn't see any of the variables being
suitable.
Added: http://hg.dovecot.org/dovecot-2.2/rev/a32eea97afc1

So you can use %{orig_user} in login_log_format_elements.