[bitbake-devel] Couple of nasty bitbake issues

[Khem Raj]

On 06/16/2011 06:54 AM, Richard Purdie wrote:
> We have two nasty bitbake issues I've found:
>
> a) Our event handlers don't behave quite as you'd expect due to the use
> of global namespace.
>
> Basically, if you *ever* register an eventhandler, even in an optional
> class like native or nativesdk, your will always subsequently get called
> for any event.
>
> This means a handler in native.bbclass will see parsing events for a
> recipe which doesn't use it. The problem comes from ast.py:
>
>      all_handlers = {}
>      for var in bb.data.getVar('__BBHANDLERS', d) or []:
>          # try to add the handler
>          handler = bb.data.getVar(var, d)
>          bb.event.register(var, handler)
>
> Since we register the handlers but never un-register them or only call
> the ones which the current recipe uses.
>
> I can work around this for now but we really should fix this.
>
> b) The none server is totally broken for logging during parsing. Trying
> to cram two combine two pieces of code into one main loop turns out not
> to work so well.
>
> The first problem is that any events coming from the sub processes
> forked off during parallel parsing don't get sent to the server/UI. I
> know this has been commented on by various people, this is the root
> cause. I was able to fix that by borrowing queue code from the process
> server, so far so good.
>
> The problem then is the logger, since the logger in the UI uses the same
> namespace and setup as the one in the server. The one in the server is
> supposed to fire() events, the one in the UI is then meant to write them
> to the console. Trying to do both things in the same process goes
> horribly wrong. I have a hacky fix where each event is just seen twice
> but it doesn't look like an easy problem to solve. I'm unable to find an
> easy way to setup two loggers in parallel copying the config from one to
> the other which is ideally what is needed.

Does something like this can help
http://www.valuedlessons.com/2008/04/events-in-python.html

>
> I like the none server as its simple to debug. At present its looking
> like it might be too ugly to fix this though. My hacks are:
>
> http://git.yoctoproject.org/cgit.cgi/poky-contrib/commit/?h=rpurdie/ml&id=a3a130b3c6ca760066ca830eb46fa472ecb84c88
>
> Cheers,
>
> Richard
>
>
>
>
>
>
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