[systemd-devel] Why does sysv generator translate Required-Start keyword into an After= ordering dep only ?

[Francis Moreau]

On Mon, Mar 7, 2016 at 2:13 PM, Lukáš Nykrýn <lnykryn at redhat.com> wrote:
> Francis Moreau píše v Po 07. 03. 2016 v 08:04 +0100:
>> Hello,
>>
>> Sorry for the long delay.
>>
>> On Fri, Feb 26, 2016 at 5:05 AM, Andrei Borzenkov <
>> arvidjaar at gmail.com> wrote:
>> > 26.02.2016 00:55, Francis Moreau пишет:
>> > >
>> > > But now I'm wondering how the following case is handled: a
>> > > sysinit
>> > > script "a" has "Required-Start: b". But "b" is a native systemd
>> > > service. I don't think the tool that enable/disable sysv services
>> > > can
>> > > enable and order correctly the native service.
>> > >
>> >
>> > What difference does it make?
>>
>> The difference is that in my current understanding nothing will pull
>> "b" in.
>>
>> Indeed "a" will have "After=b" ordering dep but that's not sufficient
>> to start "b". And since "b" is native it will not have a "SXXb"
>> installed by insserv.
>
> IIRC the behavior is still the same as it always was. Chkconfig on (at
> least rhel-based systems) did not enable the dependencies for the
> service. It only assured that the services will be started in the
> correct order.

That doesnt seem to match what Lennart said previously:

"""
Well, on SysV the requirement in the "Required-Start:" concept is
actually a request to the tool that enables/disables a service
(i.e. the chkconfig or update-rcd tool, depending on the distro). It
means that it shall enable another service "b" if "a" is to be
enabled.
"""

Thanks.
-- 
Francis