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

[Colin Helliwell]

> On 07 April 2017 at 12:57 Alexander Kanavin <alexander.kanavin at linux.intel.com> wrote:
> 
> 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.
> 

Worried about complexities of runtime mods (esp. across two other packages). What seems may be a 'simple' (if not weakness-less) method is to add my own DISTRO_FEATURE, and switch on that in my ppp_.bbappend.