[yocto] Expansion of variables inside do_package_prepend task

[Joshua Watt]

On Wed, 2018-02-21 at 16:50 +0100, Iván Castell wrote:
> Hello forum.
> 
> I have a question regarding the expansion of variables in a recipe.
> Suppose I have a recipe with this "do_install" task defined:
> 
>     do_install() {
>         BBB = ${WORKDIR}
>     }
> 
> Variable BBB expands to the proper working directory. 
> 
> 
>     $ bitbake -e <myrecipe> | grep BBB
>     BBB = /path/to/working/directory
> 
> 
> However, suppose now I have a recipe with this "do_package_prepend"
> task defined:
> 
>     do_package_prepend() {
>         AAA = ${WORKDIR}
>     }
> 
> Variable AAA doesn't expand to the expected working directory. In
> fact, it generates an error:
> 
> 
>     $ bitbake -e <myrecipe> | grep AAA
>     AAA = ${WORKDIR}
>           ^
>     SyntaxError: invalid syntax

do_package is a python function, so you prepend code must also be
python. You can do:
 AAA = d.getVar('WORKDIR')
> It seems the expansion of variables is not working inside the
> do_package_prepend task. What is going wrong with that?
> 
> Thank you in advance! :-)
> 
> 
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