[yocto] Task vardeps on a variable changed externally

[Andrei Gherzan]

Cheers Paul!

On 09/10/2019 11:07, Paul Barker wrote:
> On Wed, 9 Oct 2019, at 10:42, Andrei Gherzan wrote:
>> Hi guys,
>>
>> I struggle to figure out an issue that I lately got into. I want to have
>> a recipe which writes a manifest of all the layers part of the build.
>> These layers are all git repositories and I want their revision to be
>> exposed at runtime.
> 
> Do you need this to be an actual package or would you be happy with it just injected into the rootfs via IMAGE_PREPROCESS_COMMAND? If so you could take a look at image-buildinfo.bbclass which seemed to work well when I've done it in the past.

That is exactly what I've done in the past to workaround this but now, 
when facing the same issue again, I thought that there must be something 
better. It really sounds to me as a bug and I'm mainly searching for an 
explanation if that is not the case.

> 
> The only other way I've done something like this in the past is to put the git commands into do_compile for a recipe and set do_compile[nostamp] = "1". That way the task and every task that depends on it are always re-ran. It does mean that it will be re-ran even if the git repositories haven't been updated at all.

Myeah. That would always invalidate the recipe. Not great.

-- 
Andrei Gherzan