[OE-core] [PATCH v2] kernel.bbclass: Fix empty modules directory QA issue

[Nathan Rossi]

If a kernel is built without any external modules (aka no CONFIG_*=m),
then during a modules_install of the kernel an empty directory is
created at /lib/modules/${KERNEL_VERIONS}/kernel. This is behaviour of
the kernel infrastructure, the directory would normally be populated
with the modules that were built.

However because of the expectations of kernel-modules-split, no packages
are created when there are no modules and an empty directory lingers.
This raises QA issues as warning or errors (depending on the distro).

The following patch changes the kernel_do_install task to check if the
directory is empty and if so removes it.

Signed-off-by: Nathan Rossi <nathan.rossi at xilinx.com>
---
 meta/classes/kernel.bbclass |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 5fef446..f4dcba5 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -183,6 +183,8 @@ kernel_do_install() {
 		oe_runmake DEPMOD=echo INSTALL_MOD_PATH="${D}" modules_install
 		rm "${D}/lib/modules/${KERNEL_VERSION}/build"
 		rm "${D}/lib/modules/${KERNEL_VERSION}/source"
+		# If the kernel/ directory is empty remove it to prevent QA issues
+		rmdir --ignore-fail-on-non-empty "${D}/lib/modules/${KERNEL_VERSION}/kernel"
 	else
 		bbnote "no modules to install"
 	fi
-- 
1.7.9.5