[yocto] Remove/prevent a package's installed files if another package present

[Alexander Kanavin]

On 04/07/2017 02:53 PM, colin.helliwell at ln-systems.com wrote:
> I'd like to do a mod to my ppp recipe such that ip-up & ip-down aren't
> installed if another package is in the image recipe i.e. set in
> CORE_IMAGE_EXTRA_INSTALL.
>
> I guess I could do a do_install_append() or a pkg_postinst_(), but is there
> a way to detect the other package within the recipe? E.g. along the lines of
> what PACKAGE_CONF can do for configuration.
>
> Oh, and it needs to work after an update (e.g. rpm/deb) - don't want the
> files (re)installed by the update. (So I don't believe
> ROOTFS_POSTPROCESS_COMMAND is an option)

Maybe you should do this at runtime, and modify ip-up/down themselves 
(or the thing that utilizes them) so that they do the right thing in 
both scenarios.

Alex