[systemd-devel] Antw: Re: Antw: Re: suggestion: auto reload as the default to help packagers?

[Ulrich Windl]

>>> Andrei Borzenkov <arvidjaar at gmail.com> schrieb am 03.06.2019 um 09:48 in
Nachricht <f2d4ddbb-53a7-38df-b5d0-df35c1ee201d at gmail.com>:
> 03.06.2019 10:15, Ulrich Windl пишет:
>>>>> Michael Chapman <mike at very.puzzling.org> schrieb am 31.05.2019 um 13:28
in
>> Nachricht <alpine.LFD.2.21.1905312123080.3180 at beren.home>:
>>> On Fri, 31 May 2019, Reindl Harald wrote:
>>>> Am 31.05.19 um 12:31 schrieb Michael Chapman:
>>>>> For RPM on Fedora, the systemd package has %transfiletriggerin and 
>>>>> %transfiletriggerun scriptlets that run automatically at the end of the

>>>>> RPM transaction if units were installed or removed. This is the cleanest

>>>>> approach since it means all changes from all updated packages are
applied 
>>>>> at once.
>>>>
>>>> sadly that's all theory given that all services in Fedora are
>>>> automatically hard restartet when packages are updated and "at the end"
>>>> is too late when the service got restarted with the old unit but new
binary
>>>
>>> I actually got it slightly wrong: %transfiletriggerin and 
>>> %transfiletriggerun occur in the _middle_ of the transaction, in between 
> 
> That's not what source says:
> 
> https://github.com/rpm-software-management/rpm/blob/096ec07465f6d223a1e9d68b

> 688889e2fab103f7/lib/transaction.c#L1660
> 
> The sequence is
> 
> %pretrans
> %transfiletriggerun
> actual transaction
> %posttrans
> %transfiletriggerpostun
> %transfiletriggerin
> 
> Are you sure you do not mix up %transfiletrigger and %filetrigger?
> 
>>> installation of new packages (or new versions of packages) and removal of

>>> old packages (or old versions of packages). While %transfiletriggerin 
>>> does perform a daemon-reload, %transfiletriggerun simply stores a 
>>> flag that's picked up by a separate %filetriggerpostun scriptlet. That 
>>> reloads systemd.
>> 
>> Where is the definitive documentation for these (rather new) RPM features?
> 
> I am afraid only in sources.

You you can't expect people to use it if there is not official documentation.
As it is now it all looks like an "experimental feature" IMHO...

> 
>> And do all the major RPM-based dirstributions support these?
>> 
> 
> Upstream RPM includes support for %transfiletrigger in 4.13 so it can be
> assumed any distribution with this or newer version does support them.
> Actual patch is several years earlier.

OK: SLES12 SP3 has rpm-4.11.2, SLES15 has rpm-4.14.1...

Regards,
Ulrich Windl