Bug: empty prefix value in userdb lookup defaults to "yes"?

[Aki Tuomi]

> On 02/07/2021 11:48 Dan Malm <dam at one.com> wrote:
> 
>  
> Hi,
> 
> I'm trying to migrate some users into our system from another one that
> also run dovecot but with different prefix and separator settings than
> we do.
> 
> I've setup userdb to return these values for a test user to match the
> other systems separator/prefix setup:
> {
>   "home": "/customers/b/5/3/cdeadbeef/mail/m0123456789abcdef/",
>   "namespace/inbox/separator": "/",
>   "uid": 10000001,
>   "namespace/inbox/prefix": "",
>   "gid": 10000001
> }
> 
> But the empty value for prefix seems to get converted to some default
> value of "yes" as when I log in with that user dovecot throws this error:
> 
> Error: namespace configuration error: list=yes requires prefix=yes to
> end with separator /
> 
> Dovecot version: 2.3.13
> OS: Ubuntu 20.04.2
> 
> -- 
> BR/Mvh. Dan Malm, Systems Engineer, One.com

This is indeed what happens. Your best option is to not set the variable at all when it's empty.

Aki