Weird ALTERNATIVES and staging conflict.

Weird ALTERNATIVES and staging conflict.

[Mike Looijmans]

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. So I made two simple recipes to 
demonstrate the problem:

SUMMARY = "FPGA bitstream"
XILINX_VIVADO_VERSION = "2014.1"
require recipes-bsp/fpga/fpga-image.inc
LICENSE = "internal"
LIC_FILES_CHKSUM = 
"file://${METATOPIC_BASE}/LICENSE;md5=cf85de037de7ae12cc2d0059741fdbae"
SRC_URI = ""
S = "${WORKDIR}"

do_compile() {
	echo "${PN}" > fpga.bit
}
do_convert_bitstreams() {
	ln -f fpga.bit fpga.bin
}


I save this as "fpga-image-fake-one.bb" and "fpga-image-fake-two.bb"

I then create an image that installs them both, and bitbake that image. This 
(still) results in the following error:


ERROR: The recipe fpga-image-fake-two is trying to install files into a shared 
area when those files already exist. Those files and their manifest location are:
 
/home/mike/zynq_platform/build/tmp-glibc/sysroots/topic-miami-7015/usr/share/fpga.bin
  Matched in manifest-topic-miami-7015-fpga-image-fake-one.populate_sysroot
Please verify which recipe should provide the above files.



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?



Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


TOPIC Embedded Systems
Eindhovenseweg 32-C, NL-5683 KH Best
Postbus 440, NL-5680 AK Best
Telefoon: (+31) (0) 499 33 69 79
Telefax:  (+31) (0) 499 33 69 70
E-mail: mike.looijmans@topic.nl
Website: www.topic.nl

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Re: Weird ALTERNATIVES and staging conflict.

[Richard Purdie]

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.

> 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.

Cheers,

Richard

Re: Weird ALTERNATIVES and staging conflict.

[Mike Looijmans]

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.

>> 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?



Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


TOPIC Embedded Systems
Eindhovenseweg 32-C, NL-5683 KH Best
Postbus 440, NL-5680 AK Best
Telefoon: (+31) (0) 499 33 69 79
Telefax:  (+31) (0) 499 33 69 70
E-mail: mike.looijmans@topic.nl
Website: www.topic.nl

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Topic zoekt gedreven (embedded) software specialisten!
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Re: Weird ALTERNATIVES and staging conflict.

[Richard Purdie]

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.

Cheers,

Richard

Re: Weird ALTERNATIVES and staging conflict.

[Mike Looijmans]

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.

M.


Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


TOPIC Embedded Systems
Eindhovenseweg 32-C, NL-5683 KH Best
Postbus 440, NL-5680 AK Best
Telefoon: (+31) (0) 499 33 69 79
Telefax:  (+31) (0) 499 33 69 70
E-mail: mike.looijmans@topic.nl
Website: www.topic.nl

Please consider the environment before printing this e-mail

Topic zoekt gedreven (embedded) software specialisten!
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Re: 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


TOPIC Embedded Systems
Eindhovenseweg 32-C, NL-5683 KH Best
Postbus 440, NL-5680 AK Best
Telefoon: (+31) (0) 499 33 69 79
Telefax:  (+31) (0) 499 33 69 70
E-mail: mike.looijmans@topic.nl
Website: www.topic.nl

Please consider the environment before printing this e-mail

Topic zoekt gedreven (embedded) software specialisten!
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Re: Weird ALTERNATIVES and staging conflict.

[Richard Purdie]

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.

Cheers,

Richard

Re: 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


TOPIC Embedded Systems
Eindhovenseweg 32-C, NL-5683 KH Best
Postbus 440, NL-5680 AK Best
Telefoon: (+31) (0) 499 33 69 79
Telefax:  (+31) (0) 499 33 69 70
E-mail: mike.looijmans@topic.nl
Website: www.topic.nl

Please consider the environment before printing this e-mail

Topic zoekt gedreven (embedded) software specialisten!
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Re: Weird ALTERNATIVES and staging conflict.

[Richard Purdie]

On Mon, 2014-11-03 at 11:49 +0100, 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.

I don't know what else your recipe may need. If you don't need to stage
anything into the sysroots, make it a no-op, yes.

Cheers,

Richard