[yocto] Preventing a variable from being cached

[Paul Knopf]

I take it that this is not possible?

On Mon, Dec 4, 2017 at 5:15 PM, Paul Knopf <pauldotknopf at gmail.com> wrote:

> I have a variable that has a dynamic value that is set from python.
>
> -----------------------
> def get_git_position(d):
>     import bb.process
>     (output, error) = bb.process.run("git rev-parse --abbrev-ref HEAD")
>     result = output.rstrip()
>     (output, error) = bb.process.run("git rev-parse HEAD")
>     result += "-"
>     result += output.rstrip()
>     return result
> BUILD_GIT_POSITION := "${@get_git_position(d)}"
> -----------------------
>
> I have a task that I wont the checksum to change when "BUILD_GIT_POSITION"
> changes.
>
> -----------------------
> do_compile() {
>     gitversion "${LAYERROOT}" > ${S}/version.json
> }
>
> do_compile[vardeps] += "BUILD_GIT_POSITION"
> -----------------------
>
> What I am trying to do is trigger a recipe to rebuild if the git commit
> has changed or we changed to a different branch.
>
> However, this is not working. It seems that "BUILD_GIT_POSITION" is
> getting cached with a checksum.
>
> How do I prevent BUILD_GIT_POSITION from being cached, forcing the
> checksum "do_compile" to be recomputed?
>
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