[oe] Using EXTERNALSRC in practice

[Ulf Samuelsson]

Den 2016-06-20 kl. 15:58, skrev Jérémy Rosen:
>
>
> On 20/06/2016 15:48, Ulf Samuelsson wrote:
>> Den 2016-06-20 kl. 14:37, skrev Jérémy Rosen:
>>>
>>> On 20/06/2016 14:08, Ulf Samuelsson wrote:
>>>> We have a meta-layer which builds the kernel.
>>>>
>>>> This contains among other things:
>>>>
>>>> FILESEXTRAPATHS_prepend_<machine> = "${THIS_DIR}/<machine>"
>>>>
>>>> SRC_URI = "git://<server>/<repo.git>;protocol=ssh;branch=<branch>"
>>>> SRC_URI += "file://defconfig"
>>>>
>>>> PV = "...+git${SRCPV}"
>>>> SRCREV = "<shaid>"
>>>> ...
>>>>
>>>> Would like to have an option to build the kernel with external source.
>>>> That option should be easy to enable/disable
>>>>
>>> [skip the rest]
>>>
>>> What you are describing here is very close to how the devtool works. 
>>> I think it can deal with kernel packages in its latest iteration
>>>
>>> did you have a look at that tool ? does it satisfy your need ? if 
>>> not, what would it need to do what you want...
>>
>> No, where can I find more information?
>>
> The yocto manual has quite a section on that tool
>
>> The customer does not use the latest version of Yocto right now, so 
>> that might be a problem,
>
> depends on how old "not the latest" is... but if you can do a sandbox 
> with the latest version, you can probably see how devtool works and 
> manually do the same thing...

They use Yocto Layers, but not poky, so devtool is not present.
Anyway, devtool will generate an absolute path, and I am looking for
a recipe which uses a relative path to allow multiple yocto instances.

projects
         project1
                 yocto
                         kernelsrc + patchset1
         project2
                 yocto
                         kernelsrc + patchset2
         project3
                 yocto
                         kernelsrc + patchset3
         project4
                 yocto
                         kernelsrc + patchset4

Is there any way I can from inside a bbappend file find out the path to 
that bbappend file?


>>
>> so It would be good to have an example ".bbappend" to start with.
>>
>> BR
>>
>> Ulf
>>
>>
>