[OE-core] [RFC PATCH 1/1] classes/whitelist: add class to allow whitelisting recipes from a layer

[Patrick Ohly]

On Thu, 2015-08-20 at 15:47 +0200, Patrick Ohly wrote:
> One more comment: it would be slightly nicer if empty whitelist could be
> distinguished from no whitelist, with "empty" meaning "enable no
> recipes". In other words, replace "if whitelist" with "if whitelist is
> not None".
> 
> I want to list all PNWHITELIST_xxx values for meta-openembedded, even
> when the layer is not (yet) in bblayers.sample.conf, in order to be
> prepared for adding it later. Doing that with an empty string is more
> readable than with a fake recipe name to make the variable non-empty.

I'd like to retract that proposal. It's unusual to distinguish between
"set" and "set to empty string", and once set, it is (as far as I know)
impossible to unset a variable. I.e., when a distro conf enables white
listing for a layer, a user cannot undo that in local.conf.

Perhaps there should be an explicit PNWHITELIST_LAYERS variable which
lists all layers for which white listing is meant to be active, similar
to PACKAGES and FILES_<package>?

-- 
Best Regards, Patrick Ohly

The content of this message is my personal opinion only and although
I am an employee of Intel, the statements I make here in no way
represent Intel's position on the issue, nor am I authorized to speak
on behalf of Intel on this matter.