Restrict vendor modules to help AOSP product distribution.

Bug: 5692177

If you set "PRODUCT_RESTRICT_VENDOR_FILES := true" in a product
configuration, this changes restricts that:
- No overlays in the vendor tree.
- No PRODUCT_COPY_FILES coming from the vendor tree.
- Any referenced package with Android.mk in the vendor tree must have
  LOCAL_MODULE_OWNER set to a value that's compared against a whitelist
  stored in the core build system.

Change-Id: I172b84c7c853e9a04bf9879ea8dec90bd5054230

core/tasks/module_owner_check.mk

@@ -0,0 +1,54 @@
+#
+# Copyright (C) 2011 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Restrict the vendor module owners here.
+
+_vendor_owner_whitelist := \
+
+
+ifeq (true,$(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_RESTRICT_VENDOR_FILES))
+
+ifneq (,$(filter vendor/%, $(PRODUCT_PACKAGE_OVERLAYS) $(DEVICE_PACKAGE_OVERLAYS)))
+$(error Error: Product "$(TARGET_PRODUCT)" can not have overlay in vendor tree: \
+    $(filter vendor/%, $(PRODUCT_PACKAGE_OVERLAYS) $(DEVICE_PACKAGE_OVERLAYS)))
+endif
+ifneq (,$(filter vendor/%, $(PRODUCT_COPY_FILES)))
+$(error Error: Product "$(TARGET_PRODUCT)" can not have PRODUCT_COPY_FILES from vendor tree: \
+    $(filter vendor/%, $(PRODUCT_COPY_FILES)))
+endif
+
+_owner_check_modules := $(sort $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_PACKAGES))
+
+# expand with the required modules
+# $(1) the module name set to expand
+define _expand_required_modules
+$(eval _erm_new_modules:=)\
+$(foreach m, $(1), $(eval r:=$(ALL_MODULES.$(m).REQUIRED))\
+  $(if $(r), $(if $(filter $(_owner_check_modules), $(r)),,\
+    $(eval _owner_check_modules := $(_owner_check_modules) $(r))\
+    $(eval _erm_new_modules := $(_erm_new_modules) $(r)))))\
+$(if $(_erm_new_modules), $(call _expand_required_modules, $(_erm_new_modules)))
+endef
+
+$(call _expand_required_modules, $(_owner_check_modules))
+
+$(foreach m, $(_owner_check_modules), \
+  $(if $(filter vendor/%, $(ALL_MODULES.$(m).PATH)),\
+    $(if $(filter $(_vendor_owner_whitelist), $(ALL_MODULES.$(m).OWNER)),,\
+      $(error Error: vendor module "$(m)" in $(ALL_MODULES.$(m).PATH) with unknown owner \
+        "$(ALL_MODULES.$(m).OWNER)" in product "$(TARGET_PRODUCT)"))))
+
+endif