oe-publish-sdk: exclude sstate-cache if publishing minimal SDK
If SDK_EXT_TYPE is set to "minimal" then the SDK won't contain many
sstate artifacts, and you're required to set up an sstate mirror in this
case anyway so there's no point publishing the "stub" sstate-cache
directory from within the SDK since it won't be useful for update
purposes and may be confused with the real sstate-cache.
There is however a possibility that people might publish the real
sstate-cache directory under the same output directory provided to
oe-publish-sdk, thus deleting it after extracting (as we were doing with
other files we wanted to clean up at the end) would be problematic,
besides which extracting it and then deleting it is wasteful. Thus,
introduce a "-p" command line option to the SDK installer that we can
use to tell tar not to extract the items we don't want when publishing.
This has the added benefit of mostly keeping references to these in the
place they belong i.e. in populate_sdk_ext.bbclass.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
