Re: understanding what's in an image


Jim Abernathy
 

On 01/10/2012 09:57 AM, Gary Thomas wrote:
On 2012-01-10 07:48, Jim Abernathy wrote:
On 01/09/2012 09:07 PM, Christopher Larson wrote:
Read layer.conf in each layer. See the BBFILES variable.
--
Christopher Larson

On Monday, January 9, 2012 at 5:51 PM, James Abernathy wrote:

I'm trying to understand how bitbake parses the poky directory tree a little better.

The best I can figure all .bb files are NOT included. Just some of them are. I'm guessing that the .bb in the meta/recipe-sato named core-image-sato.bb is the one that is used
to start the parsing if bitbake core-image-sato is executed.
I originally thought all subdirectories of a path included in BBLAYER were parsed looking for .bb files, but now I know that is not true, but not sure why.

For example, it does not appear that webkit is included in the core-image-sato even though the recipe-sato directory includes the webkit subdirectory with it's recipe. What
would be the proper way of adding the webkit to core-image-sato??

Jim A

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the layer.conf in meta/conf includes and covers all .bb files under it like receipe-sato, which includes web-webkit. So does this say that the web-webkit get's built by bitbake,
but the images does not contain web-webkit until you put in the IMAGE_INSTALL += "web-webit"???
No, only packages which are needed to satisfy the needs of
the given image are built. So, if your image does not include
web-webkit, it won't be built even though there is a recipe
for it.

When building an image, bitbake looks at the image recipe and
figures out what packages are needed (these are listed explicitly).
Then any additional packages which are needed (DEPENDS, RDEPENDS, etc)
will be added to the list. This process continues until all
dependencies are met, yielding the final package set. Out of
the 1000 or so possible recipes, you may end up only building
a few hundred and many of these are support - i.e. only used
for the build process itself.
This makes sense now, thanks. I did this via hob this morning and it become more obvious because hob approaches this process as all about the package.

Jim A

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