[OE-core][PATCH 1/2] kernel.bbclass: run read_package_metadata only if packaging is enabled

["Andrea Adami" <andrea.adami@gmail.com>]

As exposed in the ML
https://lists.openembedded.org/g/openembedded-core/message/153000

up to commit 86142da in Gatesgarth it was possible to build a second mini-kernel w/out
modules to be just deployed and collected by other recipes.

These kernels use special care to avoid packaging:

inherit nopackages

PACKAGES = ""
PROVIDES = ""

Now the change in kernel.bblass calls a packaging routine:
do_deploy[prefuncs] += "read_subpackage_metadata"

As a result the kernel build fails.

Fix this using bb.data.inherits_class() to verify the
possible previous inherit of nopackages.bbclass.

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
---
 meta/classes/kernel.bbclass | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 379bed44f2..06e6446a08 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -771,8 +771,8 @@ kernel_do_deploy() {
 }
 
 # We deploy to filenames that include PKGV and PKGR, read the saved data to
-# ensure we get the right values for both
-do_deploy[prefuncs] += "read_subpackage_metadata"
+# ensure we get the right values for both. Do this only if packaging is enabled.
+do_deploy[prefuncs] += "${@ '' if bb.data.inherits_class('nopackages', d) else 'read_subpackage_metadata' }"
 
 addtask deploy after do_populate_sysroot do_packagedata
 
-- 
2.17.1