[OE-core] [for-master][RFC PATCH 0/3] Support template files for wic wks

[Ed Bartosh]

On Mon, May 02, 2016 at 12:23:54PM -0700, Christopher Larson wrote:
> From: Christopher Larson <chris_larson at mentor.com>
> 
> This adds support for .wks.in files as WKS_FILE.
> 
> These files are treated as the contents of a bitbake variable, so usual
> bitbake variable references are supported. I considered using another
> templating mechanism, for example the one used by yocto-layer, but then we'd
> end up largely mapping metadata variables to template fields anyway, which is
> a pointless indirection. Let bitbake expand the variables directly instead.
> 
> This feature lets us, for example, reference ${APPEND} in --append, and avoid
> hardcoding the serial console tty in the wks file, and let the user's changes
> to APPEND affect wic the way they do the other image construction mechanisms.
> 
> The template is read in and set in a variable at parse time, so changes to the
> variables referenced by the template will result in rebuilding the image.
> 
> It's been suggested that the name should better reflect how its contents are
> used, i.e. .bbin or so. I've also considered including something like 'bbv' or
> similar, to indicate its contents are that of a bitbake value. I think this
> should be discussed.
> 
> I'd love to hear questions or comments on this. I think the value is clear,
> and it's something we need to solve, but I'd like to hear if others agree or
> disagree on that, and whether this implementation is appropriate.
> 
The patchset looks good to me, but I'd also like to hear opinions of
people more experienced in image creation internals.

> 
> The following changes since commit 1a0e56630c5c27d8899dd0979ae0b86bbe227881:
> 
>   utils.bbclass: note for deprecated base_contains (2016-04-29 07:53:58 +0100)
> 
> are available in the git repository at:
> 
>   git://github.com/kergoth/openembedded-core wks.in
>   https://github.com/kergoth/openembedded-core/tree/wks.in
> 
> Christopher Larson (3):
>   image.bbclass: append to prefuncs/postfuncs for do_image_*
>   image_types.bbclass: add intermediate var for WKS_FILE_CHECKSUM
>   image_types.bbclass: support template .wks.in files for wic
> 
>  meta/classes/image.bbclass       |  4 ++--
>  meta/classes/image_types.bbclass | 38 +++++++++++++++++++++++++++++++++++++-
>  2 files changed, 39 insertions(+), 3 deletions(-)
> 
> -- 
> 2.8.0
> 
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Regards,
Ed