When you are working with different layer, you may find it often confusing that, due to the bbappend-functionality, any layer can alter the recipe code without further notice. This comes in very unhandy when you might be relying of a certain functionality or configuration.
This class does offer a possibility to 'protect' certain variables of a recipe from being altered by any bbappend. Also it can 'protect' files from being overloaded by bbappends.
Just inherit this class into any recipe
To protect a variable from being changed you have to add the variable name to LAYER_SANITY_PROT_VARS. LAYER_SANITY_PROT_VARS is a list of regular expression separated by spaces.
To protect a files from being changed you have to add the file name (with relative path if needed) to LAYER_SANITY_PROT_FILES.
Let's say you want the variable EXTRA_OEMAKE not being altered by any bbappend - then all you have insert into your recipe is
LAYER_SANITY_PROT_VARS += "EXTRA_OEMAKE.*"if now any of the bbappends tries to modify the content of the variable a message will be shown with the change done.
If you also want to 'protect' the file defconfig add the following into your recipe
LAYER_SANITY_PROT_FILES += "defconfig"