licence_image: Add lic-pkgs IMAGE_FEATURE

Installing license packages is similar to installing -dev or -dbg
packages, so let's invent a "lic-pkgs" IMAGE_FEATURE that does so and
document it in core-image.bbclass.

This image feature only works if LICENSE_CREATE_PACKAGE is set, so
refuse to generate an image if the lic-pkgs feature is enabled without
LICENSE_CREATE_PACKAGE.

(From OE-Core rev: eee8179f5b920d3f8907db23cbc061ed6770a02a)

Signed-off-by: Mike Crowe <mac@mcrowe.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/core-image.bbclass

@@ -31,6 +31,8 @@
 #   - post-install-logging
 # - dev-pkgs            - development packages (headers, etc.) for all installed packages in the rootfs
 # - dbg-pkgs            - debug symbol packages for all installed packages in the rootfs
+# - lic-pkgs            - license packages for all installed pacakges in the rootfs, requires
+#                         LICENSE_CREATE_PACKAGE="1" to be set when building packages too
 # - doc-pkgs            - documentation packages for all installed packages in the rootfs
 # - bash-completion-pkgs - bash-completion packages for recipes using bash-completion bbclass
 # - ptest-pkgs          - ptest packages for all ptest-enabled recipes

meta/classes/license_image.bbclass

@@ -1,5 +1,15 @@
 ROOTFS_LICENSE_DIR = "${IMAGE_ROOTFS}/usr/share/common-licenses"
 
+# This requires LICENSE_CREATE_PACKAGE=1 to work too
+COMPLEMENTARY_GLOB[lic-pkgs] = "*-lic"
+
+python() {
+    if not oe.data.typed_value('LICENSE_CREATE_PACKAGE', d):
+        features = set(oe.data.typed_value('IMAGE_FEATURES', d))
+        if 'lic-pkgs' in features:
+            bb.error("'lic-pkgs' in IMAGE_FEATURES but LICENSE_CREATE_PACKAGE not enabled to generate -lic packages")
+}
+
 python write_package_manifest() {
     # Get list of installed packages
     license_image_dir = d.expand('${LICENSE_DIRECTORY}/${IMAGE_NAME}')