[OE-core] Weird ALTERNATIVES and staging conflict.

[Mike Looijmans]

On 11/03/2014 01:09 PM, Richard Purdie wrote:
> On Mon, 2014-11-03 at 12:35 +0100, Mike Looijmans wrote:
>> On 11/03/2014 11:49 AM, Mike Looijmans wrote:
>>> On 11/03/2014 11:04 AM, Richard Purdie wrote:
>>>> On Mon, 2014-11-03 at 10:53 +0100, Mike Looijmans wrote:
>>>>> On 10/30/2014 06:47 PM, Richard Purdie wrote:
>>>>>> On Thu, 2014-10-30 at 15:17 +0100, Mike Looijmans wrote:
>>>>>>> I have this base script that builds FPGA bitstreams:
>>>>>>>
>>>>>>> https://github.com/topic-embedded-products/meta-topic/blob/master/recipes-bsp/fpga/fpga-image.inc
>>>>>>>
>>>>>>>
>>>>>>> Now you can have multiple recipes using it, and as such, it seemed a good
>>>>>>> idea
>>>>>>> to add these lines to that recipe:
>>>>>>>
>>>>>>> +ALTERNATIVE_${PN} = "fpga.bin bitstreams"
>>>>>>> +ALTERNATIVE_LINK_NAME[fpga.bin] = "${datadir}/fpga.bin"
>>>>>>> +ALTERNATIVE_TARGET[fpga.bin] = "${datadir}/fpga.bin"
>>>>>>> +ALTERNATIVE_LINK_NAME[bitstreams] = "${datadir}/bitstreams"
>>>>>>> +ALTERNATIVE_TARGET[bitstreams] = "${datadir}/bitstreams"
>>>>>>>
>>>>>>>
>>>>>>> This still resulted in staging conflicts.
>>>>>>
>>>>>> This isn't surprising since update-alternatives only works for target
>>>>>> systems. It is not designed for operating on the sysroot.
>>>>>
>>>>> I don't want these files in sysroot, I want them on target only.
>>>>
>>>> Ok, that makes things much easier.
>>>>
>>>>>>> But looking at the contents of the fake packages, the fpga.bin has been
>>>>>>> renamed by alternatives (as expected), and the symlink will be created after
>>>>>>> installing, so how come I still get this?
>>>>>>
>>>>>> The "staging" code uses the output of do_install directly and does
>>>>>> different things to the packaging code path. We've never had someone
>>>>>> with this problem before. Binaries in *bindir only get installed into
>>>>>> the sysroot in the -native case.
>>>>>>
>>>>>> I appreciate that tells you why it doesn't work and not how to fix it
>>>>>> but hopefully that helps a bit.
>>>>>
>>>>> If I understand you correctly, the problem is that the recipe is trying to
>>>>> install things in sysroot?
>>>>
>>>> Correct, by default ${datadir} is staged. The easiest way to handle this
>>>> may be to define your own sysroot_stage_all function (or
>>>> sysroot_stage_dirs) which just stages what you need, if anything.
>>>
>>> In other words, make  sysroot_stage_all into a no-op?
>>>
>>> I've been looking at the staging.bbclass, but that's basically the best I can
>>> come up with.
>>
>> Ah, slightly better:
>>
>> # Prevent bitstreams ending up in sysroot.
>> sysroot_stage_dirs_append() {
>> 	rm -rf $to${datadir}/fpga.bin $to${datadir}/bitstreams
>> }
>>
>> This wastes a bit (installing multimegabyte bitstreams only to remove them)
>> but it won't interfere with recipes that do wish to install things in sysroot.
>>
>> I've tested with this now, and this appears to do exactly as I wanted.
>
> That is fine and perfectly acceptable. Just to be clear, you can also
> do:
>
> sysroot_stage_all() {
> 	:
> }
>
> in your recipe and it will only affect that recipe, not all recipes.

It's slowly growing into a more of a class. This particular file gets included 
by all FPGA image recipes (which is why I needed the alternatives mechanism), 
so in my particular case, any change here affects a dozen actual packages.




Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


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