From 6bd3b1a7f1e90e7ccab4ea89f5d520570497c79d Mon Sep 17 00:00:00 2001
From: Tianjie <xunchang@google.com>
Date: Fri, 16 Oct 2020 18:53:47 -0700
Subject: [PATCH] Generate partial ota update package if the board defines it

Many partners have asked for platform support of system-only update.
So we config cuttlefish as an example to support the partial ota
updates. Also make such package available on the build server.
This allows continuous test to ensure the e2e update flow is working.

Bug: 170921953
Test: generate & apply a partial update, check output in presubmit
Change-Id: I79d0abeb1b2be18e6ff88f0455b6de6540a37794
---
 core/Makefile | 28 +++++++++++++++++++---------
 core/main.mk  |  1 +
 2 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/core/Makefile b/core/Makefile
index af492289da..ef9ca283d2 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -4831,7 +4831,7 @@ ifeq ($(build_ota_package),true)
 # $(1): output file
 # $(2): additional args
 define build-ota-package-target
-PATH=$(INTERNAL_USERIMAGES_BINARY_PATHS):$$PATH \
+PATH=$(INTERNAL_USERIMAGES_BINARY_PATHS):$(dir $(ZIP2ZIP)):$$PATH \
     $(OTA_FROM_TARGET_FILES) \
         --verbose \
         --extracted_input_target_files $(patsubst %.zip,%,$(BUILT_TARGET_FILES_PACKAGE)) \
@@ -4841,11 +4841,11 @@ PATH=$(INTERNAL_USERIMAGES_BINARY_PATHS):$$PATH \
         $(BUILT_TARGET_FILES_PACKAGE) $(1)
 endef
 
-name := $(TARGET_PRODUCT)
+product_name := $(TARGET_PRODUCT)
 ifeq ($(TARGET_BUILD_TYPE),debug)
-  name := $(name)_debug
+  product_name := $(product_name)_debug
 endif
-name := $(name)-ota-$(FILE_NAME_TAG)
+name := $(product_name)-ota-$(FILE_NAME_TAG)
 
 INTERNAL_OTA_PACKAGE_TARGET := $(PRODUCT_OUT)/$(name).zip
 INTERNAL_OTA_METADATA := $(PRODUCT_OUT)/ota_metadata
@@ -4860,11 +4860,7 @@ $(INTERNAL_OTA_PACKAGE_TARGET): $(BUILT_TARGET_FILES_PACKAGE) $(OTA_FROM_TARGET_
 otapackage: $(INTERNAL_OTA_PACKAGE_TARGET)
 
 ifeq ($(BOARD_BUILD_RETROFIT_DYNAMIC_PARTITIONS_OTA_PACKAGE),true)
-name := $(TARGET_PRODUCT)
-ifeq ($(TARGET_BUILD_TYPE),debug)
-  name := $(name)_debug
-endif
-name := $(name)-ota-retrofit-$(FILE_NAME_TAG)
+name := $(product_name)-ota-retrofit-$(FILE_NAME_TAG)
 
 INTERNAL_OTA_RETROFIT_DYNAMIC_PARTITIONS_PACKAGE_TARGET := $(PRODUCT_OUT)/$(name).zip
 $(INTERNAL_OTA_RETROFIT_DYNAMIC_PARTITIONS_PACKAGE_TARGET): KEY_CERT_PAIR := $(DEFAULT_KEY_CERT_PAIR)
@@ -4881,6 +4877,20 @@ otapackage otardppackage: $(INTERNAL_OTA_RETROFIT_DYNAMIC_PARTITIONS_PACKAGE_TAR
 
 endif # BOARD_BUILD_RETROFIT_DYNAMIC_PARTITIONS_OTA_PACKAGE
 
+ifneq ($(BOARD_PARTIAL_OTA_UPDATE_PARTITIONS_LIST),)
+name := $(product_name)-partial-ota-$(FILE_NAME_TAG)
+
+INTERNAL_OTA_PARTIAL_PACKAGE_TARGET := $(PRODUCT_OUT)/$(name).zip
+$(INTERNAL_OTA_PARTIAL_PACKAGE_TARGET): KEY_CERT_PAIR := $(DEFAULT_KEY_CERT_PAIR)
+$(INTERNAL_OTA_PARTIAL_PACKAGE_TARGET): $(BUILT_TARGET_FILES_PACKAGE) $(OTA_FROM_TARGET_FILES) $(INTERNAL_OTATOOLS_FILES)
+	@echo "Package partial OTA: $@"
+	$(call build-ota-package-target,$@,-k $(KEY_CERT_PAIR) --partial "$(BOARD_PARTIAL_OTA_UPDATE_PARTITIONS_LIST)")
+
+.PHONY: partialotapackage
+partialotapackage: $(INTERNAL_OTA_PARTIAL_PACKAGE_TARGET)
+
+endif # BOARD_PARTIAL_OTA_UPDATE_PARTITIONS_LIST
+
 endif    # build_ota_package
 
 # -----------------------------------------------------------------
diff --git a/core/main.mk b/core/main.mk
index 40cc70f7d5..0bf590a311 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1715,6 +1715,7 @@ else ifeq (,$(TARGET_BUILD_UNBUNDLED))
     $(INTERNAL_UPDATE_PACKAGE_TARGET) \
     $(INTERNAL_OTA_PACKAGE_TARGET) \
     $(INTERNAL_OTA_METADATA) \
+    $(INTERNAL_OTA_PARTIAL_PACKAGE_TARGET) \
     $(INTERNAL_OTA_RETROFIT_DYNAMIC_PARTITIONS_PACKAGE_TARGET) \
     $(BUILT_OTATOOLS_PACKAGE) \
     $(SYMBOLS_ZIP) \