[OE-core] [PATCH] wic: Generate startup.nsh for EFI cases if none found

[Tom Rini]

On Thu, Sep 28, 2017 at 06:47:07PM +0300, Ed Bartosh wrote:
> On Wed, Sep 20, 2017 at 12:03:27PM -0400, Tom Rini wrote:
> > In the case of non-wic images there is logic today to generate a
> > startup.nsh file that will be executed by EFI to run the loader that the
> > image contains.  In the WIC case is currently depends on that file being
> > generated elsewhere and placed in DEPLOY_DIR_IMAGE and only used if
> > present there.
> 
> What's wrong with this approach?

No one ever provides a startup.nsh and everyone that wants one creates
the same one line trivial example.  The end result is that no WIC images
are Just Bootable on UEFI systems unless you first go and spell that out
as the desired booting device.  This isn't an awesome workflow which is
why the non-WIC cases make the required startup.nsh :)

> I'd be happy to make wic to do only partitioning and assembling the
> image and avoiding to modify image content as much as possible.
> That would make wic design much more clear and let us to remove
> a lot of duplication between wic and meta/classes code.
> 
> Regarding boot partition content, I think preparing it from bootfs
> directory the same way as it's done for root partition is the way to go.
> You can find more details about it here:
> https://bugzilla.yoctoproject.org/show_bug.cgi?id=10073

I don't conceptually see a problem with going that route.  But today WIC
images aren't nearly as useful as they could be, with a rather tiny
change.

My patch is also a regression-fix, I believe, in that at some point in
the past, when Christopher's patch went in, things were laid out such
that startup.nsh was often/always generated by another class and placed
where WIC would find it and copy it in.  At some point that was
broken/changed, and no one noticed / was interested enough to fix it.

-- 
Tom
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