Add an Android.mk to generate build time configuration.

Some build time variables need to be installed on the image. Instead of
adding those fields in some system services, create a new Android.mk for
it.

BUG: 24585672

Change-Id: Ia4132ef7a200e7839702fe10f878b70cc4dfff43

diff --git a/brillo_config/Android.mk b/brillo_config/Android.mk
new file mode 100644 (file)
index 0000000..268692d
--- /dev/null
+++ b/brillo_config/Android.mk
@@ -0,0 +1,56 @@
+#
+# Copyright (C) 2015 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.
+#
+
+# Build time settings used by system services
+# ========================================================
+ifdef OSRELEASED_DIRECTORY
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := product_id
+LOCAL_MODULE_CLASS := ETC
+LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/$(OSRELEASED_DIRECTORY)
+include $(BUILD_SYSTEM)/base_rules.mk
+
+# We don't really have a default value for the product id as the backend
+# interaction will not work if this is not set correctly.
+$(LOCAL_BUILT_MODULE): BRILLO_PRODUCT_ID ?= ""
+$(LOCAL_BUILT_MODULE):
+       echo $(BRILLO_PRODUCT_ID) > $@
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := product_version
+LOCAL_MODULE_CLASS := ETC
+LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/$(OSRELEASED_DIRECTORY)
+include $(BUILD_SYSTEM)/base_rules.mk
+
+# The version is set to 0.0.0 if the user did not set the actual version.
+# This allows us to have a valid version number while being easy to filter.
+BRILLO_PRODUCT_VERSION ?= "0.0.0"
+ifeq ($(shell echo $(BRILLO_PRODUCT_VERSION) | grep -E '^[0-9]+\.[0-9]+\.[0-9]+$$'),)
+$(error Invalid BRILLO_PRODUCT_VERSION "$(BRILLO_PRODUCT_VERSION)", must be \
+  three numbers separated by dots. Example: "1.2.0")
+endif
+
+# Append BUILD_NUMBER if it is a number or a build timestamp otherwise.
+# Use DATE to generate the timestamp based on BUILD_DATETIME.
+$(LOCAL_BUILT_MODULE):
+ifeq ($(shell echo $(BUILD_NUMBER) | grep -E '[^0-9]'),)
+       echo $(BRILLO_PRODUCT_VERSION).$(BUILD_NUMBER) > $@
+else
+       echo $(BRILLO_PRODUCT_VERSION).$(BUILD_DATETIME_FROM_FILE) > $@
+endif
+
+endif