[OE-core] Weird ALTERNATIVES and staging conflict.

[Mike Looijmans]

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.




Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


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