[yocto] Path to current bb-file or layer

[Richard Purdie]

On Thu, 2017-09-21 at 22:00 +0200, Svein Seldal wrote:
> To determine a image version, I'd like to read a VERSION file which
> is 
> located in the root of the layer. (Per our development procedure.)
> I'd 
> like to read it from a bbclass file. However I seem to be unable to
> find 
> any methods or variables to find a useful path to either the current 
> bb-file or the root of the layer.
> 
> The only way I have found is to parse through BBLAYERS and guess at
> what 
> my own layer is of those, and then use the found to access the file.
> But 
> this feels very wacky.
> 
> Is there a reason why bitbake doesn't have a variable path reference
> to the current file?

You mean like ${FILE} ?

$ bitbake bash -e | grep ^FILE=
FILE="/media/build1/poky/meta/recipes-extended/bash/bash_4.4.bb"

Cheers,

Richard