[systemd-devel] Query currently active journald configuration option

[Andrei Borzenkov]

09.11.2020 19:09, Lennart Poettering пишет:
> On Mo, 09.11.20 08:48, Andrei Borzenkov (arvidjaar at gmail.com) wrote:
> 
>> Is it possible to query configuration options in effect in running
>> journald instance?
> 
> Besides the brief log output it does itself, no there's currently no
> way.
> 
> We never had that because journald can't use D-Bus, because D-Bus
> itself is a client to journald. However, we recently added support for
> a Varlink interface, which requires no broker daemon, and hence just
> works. It would make a ton of sense to extend that varlink IPC
> interface to expose some information about configuration, its state
> and statistics. Happy to review/merge a patch for that.
> 
>>
>> Background - when user asks question about journald, the first
>> information is current settings (like whether persistence is enabled or
>> not). It needs fetching files from multiple places which varies between
>> distributions (/lib vs /usr/lib). Not really user friendly and not
>> possible to do with simple command.
> 
> Fetching files from /lib or /usr/lib? What precisely do you mean?
> 

_CONF_PATHS_SPLIT_USR_NULSTR
_CONF_PATHS_SPLIT_USR

> For such build-time params we expose systemd.pc as pkg-config file,
> which has various paths as variables.
> 

Now explain it to user who barely knows what command line is and most
likely does not even have development environment installed.

Besides, what pkg-config variable exactly controls location of
configuration files? For all I can tell such variable does not exist.