[OE-core] How to force BitBake to track dependency to METADATA_REVISION?

[Richard Purdie]

On Fri, 2016-05-06 at 10:10 +0000, Kucharczyk, Bartlomiej (Nokia -
PL/Wroclaw) wrote:
> > Bitbake tracks unexpanded forms of variables, not expanded. So it's
> > literally storing '${@base_detect_revision(d)}" in the checksum,
> > not the actual revision.
> > METADATA_REVISION[vardepvalue] = "${METADATA_REVISION}" in your
> > recipe will do it.
> 
> Hello! 
> 
> Thanks for your answer. I've tried to use vardepvalue, but it does
> not work... After I build it for the second time (after bumping git
> revision), nothing is rebuilt.
> 
>     $ bitbake test
>     ...
>     NOTE: Tasks Summary: Attempted 251 tasks of which 0 didn't need
> to be rerun and all succeeded.
>     ...
>     $ echo "" >> ../README
>     $ git commit -m"test" ../README
>     $ bitbake test
>     ...
>     NOTE: Tasks Summary: Attempted 251 tasks of which 251 didn't need
> to be rerun and all succeeded.
>     ...
> 
> My test recipe is:
> 
>     $ cat ../meta/recipes-devtools/test/test_1.0.bb
>     LICENSE = "CLOSED"
>     INHIBIT_DEFAULT_DEPS = "1"
>     METADATA_REVISION[vardepvalue] = "${METADATA_REVISION}"
>     do_compile(){
>         echo "${METADATA_REVISION}" > "${S}/testfile"
>     }
> 
> Any suggestions?

The problem is probably the cache. It has no knowledge of when it needs
to reparse to see if this value has changed. If you set BB_DONT_CACHE =
"1" in the recipe, does that help?

Cheers,

Richard