[oe] guidelines for upstart in oe?

[Steffen Sledz]

Am 16.09.2011 18:15, schrieb Steffen Sledz:
> On 16.09.2011 17:32, Phil Blundell wrote:
>> On Fri, 2011-09-16 at 17:29 +0200, Steffen Sledz wrote:
>>> On 14.09.2011 17:31, Steffen Sledz wrote:
>>>> If i remember right there are some first experiments with using upstart as an sysvinit replacement in some oe based distros.
>>>>
>>>> Do some guidelines or suggestions exist to make an application recipes upstart ready?
>>>>
>>>> Nowadays a recipe for a common service contains INITSCRIPT_NAME & Co and installs an init script for sysvinit.
>>>>
>>>> How should such a recipe be modified to be able to install the application in a native upstart image (without sysvinit compatible runlevels)?
>>>
>>> Let me put it in concrete terms.
>>>
>>> Is it possible to write a bb recipe in a way like this?
>>>
>>> ---------------------->snip<-------------------------
>>> ...
>>> IF IMAGE USES UPSTART AS INIT THEN
>>>
>>
>> Fundamentally no, since there is no way to know at the time the recipe
>> is evaluated what images it will go into.
>>
>> It would be possible to ship both sets of scripts and then have a
>> postprocessing step to remove the ones that you don't need.  Or you
>> could make upstart vs sysvinit be a DISTRO_FEATURE.  Or, in at least
>> some cases, we could probably stop shipping the scripts as discrete
>> files altogether and replace them with some symbolic representation from
>> which the necessary scripts could be constructed dynamically at install
>> time.
> 
> I'm not sure if there exist upstart based oe distros/images. But it seems that there are some systemd based ones (recipes/images/angstrom-systemd-image.bb).
> 
> Do they have a similar problem? How do these handle the sysvinit config vs. systemd config for the different services?

BTW: What exactly are purpose and effects of IMAGE_INIT_MANAGER?

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