Purpose of stats-writer and why doveadm try to open it to dump stats ?

[Jean-Daniel]

> Le 14 juil. 2019 à 11:58, Reio Remma <reio at mrstuudio.ee> a écrit :
> 
> On 14.07.2019 10:10, Jean-Daniel via dovecot wrote:
>> Hello,
>> 
>> I want to monitor dovecot stats, and so I have an exporter process that run with limited rights.
>> The monitoring user has only access to /var/run/dovecot/stats-reader and it works fine.
>> Doveadm stats dump returns the list of all stats as expected.
>> 
>> But each time I run doveadm stats dump, it logs the following error:
>> 
>> Error: net_connect_unix(/var/run/dovecot/stats-writer) failed: Permission denied
>> 
>> So what is the purpose of the stats-writer socket, and why doveadm try to open it to simply dump stats ?
>> Is it really something it needs and I should update my user permissions or is it a doveadm bug ?
>> 
> 
> Hello!
> 
> Depending on the system you're running on, there may be SELinux etc. doing its work.
> 

I know why stats-writer is not accessible, this is on purpose (doveadm run with a uid that explicitly don’t have access to stats-writer).

What I want to know is why does doveadm even try to open it to simply dump the stats.