Add selinux and verity support to custom image generation.

New custom image configuration variables:
- CUSTOM_IMAGE_SELINUX, set to "true" if the image supports selinux.
- CUSTOM_IMAGE_SUPPORT_VERITY, set to "true" if the product supports verity.
- CUSTOM_IMAGE_VERITY_BLOCK_DEVICE

Also changed the staging directory name to the mount point, like we do
for other images built by the build system.

Bug: 19609718
Change-Id: I6bbf06b79eee63e4c77834f2e6f1d5a7f7e00a12
(cherry picked from commit 7d51a40295)

core/tasks/build_custom_images.mk

@@ -34,6 +34,9 @@
 #     module's LOCAL_PICKUP_FILES.
 #   - CUSTOM_IMAGE_COPY_FILES, a list of "<src>:<dest>" to be copied to the
 #     image. <dest> is relativ to the root of the image.
+#   - CUSTOM_IMAGE_SELINUX, set to "true" if the image supports selinux.
+#   - CUSTOM_IMAGE_SUPPORT_VERITY, set to "true" if the product supports verity.
+#   - CUSTOM_IMAGE_VERITY_BLOCK_DEVICE
 #
 # To build all those images, run "make custom_images".
 
@@ -48,6 +51,9 @@ custom_image_parameter_variables := \
   CUSTOM_IMAGE_DICT_FILE \
   CUSTOM_IMAGE_MODULES \
   CUSTOM_IMAGE_COPY_FILES \
+  CUSTOM_IMAGE_SELINUX \
+  CUSTOM_IMAGE_SUPPORT_VERITY \
+  CUSTOM_IMAGE_VERITY_BLOCK_DEVICE \
 
 # We don't expect product makefile to inherit/override PRODUCT_CUSTOM_IMAGE_MAKEFILES,
 # so we don't put it in the _product_var_list.

core/tasks/tools/build_custom_image.mk

@@ -26,7 +26,7 @@ my_custom_image_name := $(basename $(notdir $(my_custom_imag_makefile)))
 
 intermediates := $(call intermediates-dir-for,PACKAGING,$(my_custom_image_name))
 my_built_custom_image := $(intermediates)/$(my_custom_image_name).img
-my_staging_dir := $(intermediates)/$(my_custom_image_name)
+my_staging_dir := $(intermediates)/$(CUSTOM_IMAGE_MOUNT_POINT)
 
 # Collect CUSTOM_IMAGE_MODULES's installd files and their PICKUP_FILES.
 my_built_modules :=
@@ -69,6 +69,10 @@ $(my_built_custom_image): PRIVATE_FILE_SYSTEM_TYPE := $(CUSTOM_IMAGE_FILE_SYSTEM
 $(my_built_custom_image): PRIVATE_STAGING_DIR := $(my_staging_dir)
 $(my_built_custom_image): PRIVATE_COPY_PAIRS := $(my_copy_pairs)
 $(my_built_custom_image): PRIVATE_PICKUP_FILES := $(my_pickup_files)
+$(my_built_custom_image): PRIVATE_SELINUX := $(CUSTOM_IMAGE_SELINUX)
+$(my_built_custom_image): PRIVATE_SUPPORT_VERITY := $(CUSTOM_IMAGE_SUPPORT_VERITY)
+$(my_built_custom_image): PRIVATE_VERITY_KEY := $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_VERITY_SIGNING_KEY)
+$(my_built_custom_image): PRIVATE_VERITY_BLOCK_DEVICE := $(CUSTOM_IMAGE_VERITY_BLOCK_DEVICE)
 $(my_built_custom_image): PRIVATE_DICT_FILE := $(CUSTOM_IMAGE_DICT_FILE)
 $(my_built_custom_image): $(INTERNAL_USERIMAGES_DEPS) $(my_built_modules) $(my_image_copy_files) \
   $(CUSTOM_IMAGE_DICT_FILE)
@@ -86,6 +90,12 @@ $(my_built_custom_image): $(INTERNAL_USERIMAGES_DEPS) $(my_built_modules) $(my_i
 	$(hide) echo "mount_point=$(PRIVATE_MOUNT_POINT)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt
 	$(hide) echo "fs_type=$(PRIVATE_FILE_SYSTEM_TYPE)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt
 	$(hide) echo "partition_size=$(PRIVATE_PARTITION_SIZE)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt
+	$(if $(PRIVATE_SELINUX),$(hide) echo "selinux_fc=$(SELINUX_FC)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt)
+	$(if $(PRIVATE_SUPPORT_VERITY),\
+	  $(hide) echo "verity=$(PRIVATE_SUPPORT_VERITY)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt;\
+	    echo "verity_key=$(PRIVATE_VERITY_KEY)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt;\
+	    echo "verity_signer_cmd=$(VERITY_SIGNER)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt;\
+	    echo "verity_block_device=$(PRIVATE_VERITY_BLOCK_DEVICE)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt)
 	$(if $(PRIVATE_DICT_FILE),\
 	  $(hide) echo "# Properties from $(PRIVATE_DICT_FILE)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt;\
 	    cat $(PRIVATE_DICT_FILE) >> $(PRIVATE_INTERMEDIATES)/image_info.txt)