[systemd-devel] Antw: Re: Antw: [EXT] Re: Q: Debugging missing requirements

[Ulrich Windl]

>>> Dave Howorth <systemd at howorth.org.uk> schrieb am 12.02.2021 um 16:17 in
Nachricht <20210212151718.1ff9b095 at acer-suse.lan>:
> On Fri, 12 Feb 2021 18:04:58 +0300
> Andrei Borzenkov <arvidjaar at gmail.com> wrote:
>> 12.02.2021 10:04, Ulrich Windl пишет:
>> >>>> Andrei Borzenkov <arvidjaar at gmail.com> schrieb am 11.02.2021 um
>> >>>> 15:20 in  
>> > Nachricht
>> > <CAA91j0VND=nJSDpK30_=fTxd5DoChqRLd=XJOLzKnqoLV1Jjkg at mail.gmail.com>:  
>> >> On Thu, Feb 11, 2021 at 1:47 PM Ulrich Windl
>> >> <Ulrich.Windl at rz.uni-regensburg.de> wrote:  
>> >>>
>> >>> Hi!
>> >>>
>> >>> Suspecting systemd added some requirement that isn't fulfilled
>> >>> after boot,   
>> >> preventing my units from starting I wonder:  
>> >>> How can I debug systemd's requirements checking for units that
>> >>> are enabled,   
>> >> but not started at boot (status "inactive (dead)"?
>> >>
>> >> Usual advice is - enable debug logging.  
>> > 
>> > Can I enable this for a specific unit, or just globally?
>> 
>> Not that I am aware of. It is all or nothing.
> 
> But you don't need to look at them all for other units. You can use
> --priority to view just the levels you wish to. So there'll be more
> information in the log files, but no need to look at it unless you wish
> to.

Still it would sound like a nice feature: Enabling and disabling unit
debugging at run-time.
Something like
systemctl loglevel=debug unit...

> 
>> >>  
>> >>> Or another way: Can I list the dependencies that systemd added   
>> >> automatically?  
>> >>>  
>> >>
>> >> If you mean implicit or default dependencies - no. They are listed
>> >> in man pages, although there is no guarantee that list is
>> >> complete. Your best bet is source code.  
>> > 
>> > 
>> > 
>> >   
>> 
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