Can confirm that no attempt or submission was made to merge
meta-bitbake-variable-substitution into mainline/core. I'm happy if people
are finding it useful, but it was written very much for my use case(s). I
didn't spend much time designing it or thinking through how other people
may prefer it to work. Not to disparage it; I just mean to say there is
likely room for improvement.
Ross is also correct that automatic expansion shouldn't be the only mode of
operation. That's why meta-bitbake-variable-substitution has the option to
specify search and replace file paths:
${@bitbake_variables_search_and_sub("${PATH_OR_FILE_TO_PROCESS}",
r"${BITBAKE_VAR_SUB_DELIM}", d)}
I found cases where it was attempting variable substitution where I didn't
want it (e.g. when appending a recipe), and needed a method to be a bit
more surgical.
thanks,
Corey
On Fri, Jul 21, 2023 at 4:39 AM Ross Burton <[email protected]> wrote:
> On 21 Jul 2023, at 10:24, Yann CARDAILLAC via lists.openembedded.org
> <[email protected]> wrote:
> > There's something that has always been missing in my experience of
> Yocto, it's the ability to simply configure files with yocto variables.
> >
> > Basically the idea is to have a class that will automatically sed all
> variables from yocto inside a file using a delimiter, or to reuse the way
> it is done with .wks.in with the ${var} syntax, even if I can already see
> some limitations with shell scripts.
> >
> > What I intend to do is to provide some variables to a recipe and then to
> use them to complete a template.
> >
> > For instance I'd like to put some stuff inside my machine.conf and want
> those variables to be filled inside my templated script.
> >
> > Is there any official way to do this?
> >
> > As far as I can see there's not, the only examples I've found are using
> hand made seds. But I might not be looking in the right place.
> >
> > If I'm right, I'm wondering why this is not generalized inside a poky
> class. I've found this meta :
> https://github.com/coreycothrum/meta-bitbake-variable-substitution doing
> exactly what I needed, but since it's not mainline I assume that as always
> there's a good reason why it's not something you want to have in mainline.
> >
> > If that's only because there wasn't any submission and If you're up for
> it going mainline, I can work (with coreycothrum if he wants to?) it
> through the patch submission process.
>
> There’s also a class that I hacked up a while ago that I never finished
> because I wanted to automatically handle variable dependencies, otherwise
> it’s no good:
>
> https://github.com/rossburton/meta-ross/blob/master/classes/bbin.bbclass
>
> I’d like to see something in core, but the scope should be relatively
> tight. I don’t like the automatic expansion that
> meta-bitbake-variable-substitution does, I’m thinking of a pathological
> case where piglit wanted to use @@bindir@@ in a wrapper script: it would
> also attempt to process many gigabytes of installed files.
>
> The bbin class _only_ works on files in SRC_URI, so foo.sh.bbin would be
> processed at do_unpack and end up in WORKDIR/foo.sh. The scope is more
> limited but you know exactly what it’s doing.
>
> Ross
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