diff --git a/core/Makefile b/core/Makefile
index 0b63915..ac8b2f2 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -887,6 +887,10 @@
 
 INTERNAL_USERIMAGES_DEPS += $(BLK_ALLOC_TO_BASE_FS)
 
+ifeq ($(INTERNAL_USERIMAGES_USE_EXT),true)
+INTERNAL_USERIMAGES_DEPS += $(MKE2FS_CONF)
+endif
+
 # $(1): the path of the output dictionary file
 # $(2): additional "key=value" pairs to append to the dictionary file.
 define generate-userimage-prop-dictionary
@@ -937,10 +941,10 @@
 $(if $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VBOOT),$(hide) echo "futility=$(notdir $(FUTILITY))" >> $(1))
 $(if $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VBOOT),$(hide) echo "vboot_signer_cmd=$(VBOOT_SIGNER)" >> $(1))
 $(if $(BOARD_AVB_ENABLE),$(hide) echo "avb_signing_args=$(INTERNAL_AVB_SIGNING_ARGS)" >> $(1))
-$(if $(BOARD_AVB_ENABLE),$(hide) echo "avb_avbtool=$(AVBTOOL)" >> $(1))
-$(if $(BOARD_AVB_ENABLE),$(hide) echo "system_avb_enable=$(BOARD_AVB_ENABLE)" >> $(1))
+$(if $(BOARD_AVB_ENABLE),$(hide) echo "avb_avbtool=$(notdir $(AVBTOOL))" >> $(1))
+$(if $(BOARD_AVB_ENABLE),$(hide) echo "system_avb_hashtree_enable=$(BOARD_AVB_ENABLE)" >> $(1))
 $(if $(BOARD_AVB_ENABLE),$(hide) echo "system_avb_add_hashtree_footer_args=$(BOARD_AVB_SYSTEM_ADD_HASHTREE_FOOTER_ARGS)" >> $(1))
-$(if $(BOARD_AVB_ENABLE),$(hide) echo "vendor_avb_enable=$(BOARD_AVB_ENABLE)" >> $(1))
+$(if $(BOARD_AVB_ENABLE),$(hide) echo "vendor_avb_hashtree_enable=$(BOARD_AVB_ENABLE)" >> $(1))
 $(if $(BOARD_AVB_ENABLE),$(hide) echo "vendor_avb_add_hashtree_footer_args=$(BOARD_AVB_VENDOR_ADD_HASHTREE_FOOTER_ARGS)" >> $(1))
 $(if $(filter true,$(BOARD_USES_RECOVERY_AS_BOOT)),\
     $(hide) echo "recovery_as_boot=true" >> $(1))
@@ -1875,6 +1879,7 @@
   $(HOST_OUT_JAVA_LIBRARIES)/dumpkey.jar \
   $(HOST_OUT_JAVA_LIBRARIES)/signapk.jar \
   $(HOST_OUT_JAVA_LIBRARIES)/BootSignature.jar \
+  $(HOST_OUT_JAVA_LIBRARIES)/VeritySigner.jar \
   $(HOST_OUT_EXECUTABLES)/make_ext4fs \
   $(HOST_OUT_EXECUTABLES)/mkuserimg.sh \
   $(HOST_OUT_EXECUTABLES)/mke2fs \
@@ -1896,6 +1901,7 @@
   $(HOST_OUT_EXECUTABLES)/brillo_update_payload \
   $(HOST_OUT_EXECUTABLES)/lib/shflags/shflags \
   $(HOST_OUT_EXECUTABLES)/delta_generator \
+  $(AVBTOOL) \
   $(BLK_ALLOC_TO_BASE_FS)
 
 ifeq (true,$(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VBOOT))
@@ -1938,22 +1944,32 @@
 BUILT_OTATOOLS_PACKAGE := $(PRODUCT_OUT)/otatools.zip
 $(BUILT_OTATOOLS_PACKAGE): zip_root := $(call intermediates-dir-for,PACKAGING,otatools)/otatools
 
-$(BUILT_OTATOOLS_PACKAGE): $(OTATOOLS) | $(ACP)
+OTATOOLS_DEPS := \
+  system/extras/verity/build_verity_metadata.py \
+  system/extras/ext4_utils/mke2fs.conf \
+  external/avb/test/data/testkey_rsa4096.pem \
+  $(shell find build/target/product/security -type f -name \*.x509.pem -o -name \*.pk8 -o \
+      -name verity_key | sort) \
+  $(shell find device vendor -type f -name \*.pk8 -o -name verifiedboot\* -o \
+      -name \*.x509.pem -o -name oem\*.prop | sort)
+
+OTATOOLS_RELEASETOOLS := \
+  $(shell find build/tools/releasetools -name \*.pyc -prune -o -type f | sort)
+
+ifeq (true,$(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VBOOT))
+OTATOOLS_DEPS += \
+  $(shell find external/vboot_reference/tests/devkeys -type f | sort)
+endif
+
+$(BUILT_OTATOOLS_PACKAGE): $(OTATOOLS) $(OTATOOLS_DEPS) $(OTATOOLS_RELEASETOOLS) | $(ACP)
 	@echo "Package OTA tools: $@"
 	$(hide) rm -rf $@ $(zip_root)
-	$(hide) mkdir -p $(dir $@) $(zip_root)/bin $(zip_root)/framework $(zip_root)/releasetools $(zip_root)/system/extras/verity
+	$(hide) mkdir -p $(dir $@) $(zip_root)/bin $(zip_root)/framework $(zip_root)/releasetools
 	$(call copy-files-with-structure,$(OTATOOLS),$(HOST_OUT)/,$(zip_root))
-	$(hide) $(ACP) $(HOST_OUT_JAVA_LIBRARIES)/VeritySigner.jar $(zip_root)/framework/
-	$(hide) $(ACP) -p system/extras/verity/build_verity_metadata.py $(zip_root)/system/extras/verity/
 	$(hide) $(ACP) -r -d -p build/tools/releasetools/* $(zip_root)/releasetools
-ifeq (true,$(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VBOOT))
-	$(hide) mkdir -p $(zip_root)/external/vboot_reference/tests/devkeys
-	$(hide) $(ACP) -r -d -p external/vboot_reference/tests/devkeys/* $(zip_root)/external/vboot_reference/tests/devkeys
-endif
 	$(hide) rm -rf $@ $(zip_root)/releasetools/*.pyc
 	$(hide) (cd $(zip_root) && zip -qryX $(abspath $@) *)
-	$(hide) zip -qryX $(abspath $@) build/target/product/security/
-	$(hide) find device vendor -name \*.pk8 -o -name verifiedboot\* -o -name \*.x509.pem -o -name oem\*.prop | xargs zip -qryX $(abspath $@)>/dev/null || true
+	$(hide) echo $(OTATOOLS_DEPS) | xargs zip -qryX $(abspath $@)>/dev/null || true
 
 .PHONY: otatools-package
 otatools-package: $(BUILT_OTATOOLS_PACKAGE)
diff --git a/core/cleanbuild.mk b/core/cleanbuild.mk
index b7109f6..0e1c88d 100644
--- a/core/cleanbuild.mk
+++ b/core/cleanbuild.mk
@@ -144,88 +144,6 @@
 
 endif  # if not ONE_SHOT_MAKEFILE dont_bother NO_ANDROID_CLEANSPEC
 
-#
-# installclean logic
-#
-
-# The files/dirs to delete during an installclean.
-#
-# Deletes all of the installed files -- the intent is to remove files
-# that may no longer be installed, either because the user previously
-# installed them, or they were previously installed by default but no
-# longer are.
-#
-# This is faster than a full clean, since we're not deleting the
-# intermediates. Instead of recompiling, we can just copy the results.
-#
-# Host bin, frameworks, and lib* are intentionally omitted, since
-# otherwise we'd have to rebuild any generated files created with those
-# tools.
-installclean_files := \
-	$(HOST_OUT)/obj/NOTICE_FILES \
-	$(HOST_OUT)/obj/PACKAGING \
-	$(HOST_OUT)/coverage \
-	$(HOST_OUT)/cts \
-	$(HOST_OUT)/nativetest* \
-	$(HOST_OUT)/sdk \
-	$(HOST_OUT)/sdk_addon \
-	$(HOST_OUT)/testcases \
-	$(HOST_OUT)/vts \
-	$(HOST_CROSS_OUT)/bin \
-	$(HOST_CROSS_OUT)/coverage \
-	$(HOST_CROSS_OUT)/lib* \
-	$(HOST_CROSS_OUT)/nativetest* \
-	$(PRODUCT_OUT)/*.img \
-	$(PRODUCT_OUT)/*.ini \
-	$(PRODUCT_OUT)/*.txt \
-	$(PRODUCT_OUT)/*.xlb \
-	$(PRODUCT_OUT)/*.zip \
-	$(PRODUCT_OUT)/kernel \
-	$(PRODUCT_OUT)/data \
-	$(PRODUCT_OUT)/skin \
-	$(PRODUCT_OUT)/obj/NOTICE_FILES \
-	$(PRODUCT_OUT)/obj/PACKAGING \
-	$(PRODUCT_OUT)/recovery \
-	$(PRODUCT_OUT)/root \
-	$(PRODUCT_OUT)/system \
-	$(PRODUCT_OUT)/system_other \
-	$(PRODUCT_OUT)/vendor \
-	$(PRODUCT_OUT)/oem \
-	$(PRODUCT_OUT)/obj/FAKE \
-	$(PRODUCT_OUT)/breakpad \
-	$(PRODUCT_OUT)/cache \
-	$(PRODUCT_OUT)/coverage \
-	$(PRODUCT_OUT)/installer \
-	$(PRODUCT_OUT)/odm \
-	$(PRODUCT_OUT)/sysloader \
-	$(PRODUCT_OUT)/testcases \
-
-# The files/dirs to delete during a dataclean, which removes any files
-# in the staging and emulator data partitions.
-dataclean_files := \
-	$(PRODUCT_OUT)/data/* \
-	$(PRODUCT_OUT)/data-qemu/* \
-	$(PRODUCT_OUT)/userdata-qemu.img
-
-# make sure *_OUT is set so that we won't result in deleting random parts
-# of the filesystem.
-ifneq (2,$(words $(HOST_OUT) $(PRODUCT_OUT)))
-  $(error both HOST_OUT and PRODUCT_OUT should be set at this point.)
-endif
-
-# Define the rules for commandline invocation.
-.PHONY: dataclean
-dataclean: FILES := $(dataclean_files)
-dataclean:
-	$(hide) rm -rf $(FILES)
-	@echo "Deleted emulator userdata images."
-
-.PHONY: installclean
-installclean: FILES := $(installclean_files)
-installclean: dataclean
-	$(hide) rm -rf $(FILES)
-	@echo "Deleted images and staging directories."
-
 ###########################################################
 
 .PHONY: clean-jack-files
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 0f38b80..a865597 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -115,6 +115,8 @@
 LOCAL_JARJAR_RULES:=
 LOCAL_JAR_MANIFEST:=
 LOCAL_JAR_PACKAGES:=
+LOCAL_JAR_PROCESSOR:=
+LOCAL_JAR_PROCESSOR_ARGS:=
 LOCAL_JAVACFLAGS:=
 LOCAL_JAVA_LANGUAGE_VERSION:=
 LOCAL_JAVA_LAYERS_FILE:=
diff --git a/core/config.mk b/core/config.mk
index 648277c..f5e0aa6 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -133,11 +133,7 @@
 # Parse out any modifier targets.
 # ###############################################################
 
-# The 'showcommands' goal says to show the full command
-# lines being executed, instead of a short message about
-# the kind of operation being done.
-SHOW_COMMANDS:= $(filter showcommands,$(MAKECMDGOALS))
-hide := $(if $(SHOW_COMMANDS),,@)
+hide := @
 
 ################################################################
 # Tools needed in product configuration makefiles.
@@ -603,9 +599,11 @@
 ifeq ($(TARGET_USES_MKE2FS),true)
 MAKE_EXT4FS := $(HOST_OUT_EXECUTABLES)/mke2fs$(HOST_EXECUTABLE_SUFFIX)
 MKEXTUSERIMG := $(HOST_OUT_EXECUTABLES)/mkuserimg_mke2fs.sh
+MKE2FS_CONF := system/extras/ext4_utils/mke2fs.conf
 else
 MAKE_EXT4FS := $(HOST_OUT_EXECUTABLES)/make_ext4fs$(HOST_EXECUTABLE_SUFFIX)
 MKEXTUSERIMG := $(HOST_OUT_EXECUTABLES)/mkuserimg.sh
+MKE2FS_CONF :=
 endif
 BLK_ALLOC_TO_BASE_FS := $(HOST_OUT_EXECUTABLES)/blk_alloc_to_base_fs$(HOST_EXECUTABLE_SUFFIX)
 MAKE_SQUASHFS := $(HOST_OUT_EXECUTABLES)/mksquashfs$(HOST_EXECUTABLE_SUFFIX)
@@ -826,10 +824,10 @@
 RS_PREBUILT_CLCORE := prebuilts/sdk/renderscript/lib/$(TARGET_ARCH)/librsrt_$(TARGET_ARCH).bc
 RS_PREBUILT_COMPILER_RT := prebuilts/sdk/renderscript/lib/$(TARGET_ARCH)/libcompiler_rt.a
 ifeq (true,$(TARGET_IS_64_BIT))
-RS_PREBUILT_LIBPATH := -L prebuilts/ndk/current/platforms/android-21/arch-$(TARGET_ARCH)/usr/lib64 \
-                       -L prebuilts/ndk/current/platforms/android-21/arch-$(TARGET_ARCH)/usr/lib
+RS_PREBUILT_LIBPATH := -L prebuilts/ndk/r10/platforms/android-21/arch-$(TARGET_ARCH)/usr/lib64 \
+                       -L prebuilts/ndk/r10/platforms/android-21/arch-$(TARGET_ARCH)/usr/lib
 else
-RS_PREBUILT_LIBPATH := -L prebuilts/ndk/current/platforms/android-9/arch-$(TARGET_ARCH)/usr/lib
+RS_PREBUILT_LIBPATH := -L prebuilts/ndk/r10/platforms/android-9/arch-$(TARGET_ARCH)/usr/lib
 endif
 
 # API Level lists for Renderscript Compat lib.
@@ -882,8 +880,7 @@
 
 # These goals don't need to collect and include Android.mks/CleanSpec.mks
 # in the source tree.
-dont_bother_goals := dataclean installclean \
-    help out \
+dont_bother_goals := out \
     snod systemimage-nodeps \
     stnod systemtarball-nodeps \
     userdataimage-nodeps userdatatarball-nodeps \
diff --git a/core/definitions.mk b/core/definitions.mk
index 3445271..15ef6f4 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -846,10 +846,10 @@
 ## Use echo-(warning|error) in a build rule
 ## Use pretty-(warning|error) instead of $(warning)/$(error)
 ###########################################################
-ESC_BOLD := \e[1m
-ESC_WARNING := \e[35m
-ESC_ERROR := \e[31m
-ESC_RESET := \e[0m
+ESC_BOLD := \033[1m
+ESC_WARNING := \033[35m
+ESC_ERROR := \033[31m
+ESC_RESET := \033[0m
 
 # $(1): path (and optionally line) information
 # $(2): message to print
@@ -1049,8 +1049,9 @@
 	$(dir $@)/$(notdir $(<:.bc=.o)) \
 	$(RS_PREBUILT_COMPILER_RT) \
 	-o $@ $(TARGET_GLOBAL_LDFLAGS) -Wl,--hash-style=sysv -L prebuilts/gcc/ \
-	$(RS_PREBUILT_LIBPATH) -L $(TARGET_OUT_INTERMEDIATE_LIBRARIES) \
-	-lRSSupport -lm -lc
+	$(RS_PREBUILT_LIBPATH) \
+	$(call intermediates-dir-for,SHARED_LIBRARIES,libRSSupport)/libRSSupport.so \
+	-lm -lc
 endef
 
 ###########################################################
@@ -2531,11 +2532,17 @@
 $(if $(filter $(1),$(PLATFORM_VERSION_CODENAME)),10000,$(1))
 endef
 
+# --add-opens is required because desugar reflects via java.lang.invoke.MethodHandles.Lookup
 define desugar-classes-jar
 @echo Desugar: $@
 @mkdir -p $(dir $@)
 $(hide) rm -f $@ $@.tmp
-$(hide) java -jar $(DESUGAR) \
+@rm -rf $(dir $@)/desugar_dumped_classes
+@mkdir $(dir $@)/desugar_dumped_classes
+$(hide) java \
+    $(if $(EXPERIMENTAL_USE_OPENJDK9),--add-opens java.base/java.lang.invoke=ALL-UNNAMED,) \
+    -Djdk.internal.lambda.dumpProxyClasses=$(abspath $(dir $@))/desugar_dumped_classes \
+    -jar $(DESUGAR) \
     $(addprefix --bootclasspath_entry ,$(call desugar-bootclasspath,$(PRIVATE_BOOTCLASSPATH))) \
     $(addprefix --classpath_entry ,$(PRIVATE_ALL_JAVA_LIBRARIES)) \
     --min_sdk_version $(call codename-or-sdk-to-sdk,$(PRIVATE_DEFAULT_APP_TARGET_SDK)) \
@@ -2687,10 +2694,14 @@
 $(call sign-package-arg,$@)
 endef
 
+# signapk uses internal APIs from sun.security.{pkcs,x509}; see http://b/37137869
 # $(1): the package file we are signing.
 define sign-package-arg
 $(hide) mv $(1) $(1).unsigned
-$(hide) java -Djava.library.path=$(SIGNAPK_JNI_LIBRARY_PATH) -jar $(SIGNAPK_JAR) \
+$(hide) java -Djava.library.path=$(SIGNAPK_JNI_LIBRARY_PATH) \
+    $(if $(EXPERIMENTAL_USE_OPENJDK9),--add-exports java.base/sun.security.pkcs=ALL-UNNAMED,) \
+    $(if $(EXPERIMENTAL_USE_OPENJDK9),--add-exports java.base/sun.security.x509=ALL-UNNAMED,) \
+    -jar $(SIGNAPK_JAR) \
     $(PRIVATE_CERTIFICATE) $(PRIVATE_PRIVATE_KEY) \
     $(PRIVATE_ADDITIONAL_CERTIFICATES) $(1).unsigned $(1).signed
 $(hide) mv $(1).signed $(1)
@@ -3166,10 +3177,10 @@
 # Requires for each suite: my_compat_dist_$(suite) to be defined.
 define create-suite-dependencies
 $(foreach suite, $(LOCAL_COMPATIBILITY_SUITE), \
-  $(eval my_compat_files_$(suite) := $(call copy-many-files, $(my_compat_dist_$(suite)))) \
   $(eval COMPATIBILITY.$(suite).FILES := \
-    $(COMPATIBILITY.$(suite).FILES) $(my_compat_files_$(suite))) \
-  $(eval $(my_all_targets) : $(my_compat_files_$(suite))))
+    $(COMPATIBILITY.$(suite).FILES) $(foreach f,$(my_compat_dist_$(suite)),$(call word-colon,2,$(f))))) \
+$(eval $(my_all_targets) : $(call copy-many-files, \
+  $(sort $(foreach suite,$(LOCAL_COMPATIBILITY_SUITE),$(my_compat_dist_$(suite))))))
 endef
 
 ###########################################################
diff --git a/core/distdir.mk b/core/distdir.mk
index 51ec46e..89c5966 100644
--- a/core/distdir.mk
+++ b/core/distdir.mk
@@ -17,16 +17,8 @@
 # When specifying "dist", the user has asked that we copy the important
 # files from this build into DIST_DIR.
 
-.PHONY: dist
-dist: ;
-
 dist_goal := $(strip $(filter dist,$(MAKECMDGOALS)))
 MAKECMDGOALS := $(strip $(filter-out dist,$(MAKECMDGOALS)))
-ifeq (,$(strip $(filter-out $(INTERNAL_MODIFIER_TARGETS),$(MAKECMDGOALS))))
-# The commandline was something like "make dist" or "make dist showcommands".
-# Add a dependency on a real target.
-dist: $(DEFAULT_GOAL)
-endif
 
 ifdef dist_goal
 
diff --git a/core/droiddoc.mk b/core/droiddoc.mk
index a70ab03..7e17a13 100644
--- a/core/droiddoc.mk
+++ b/core/droiddoc.mk
@@ -175,6 +175,7 @@
 	$(hide) ( \
 		javadoc \
                 -encoding UTF-8 \
+                -source 1.8 \
                 \@$(PRIVATE_SRC_LIST_FILE) \
                 -J-Xmx1600m \
                 -XDignore.symbol.file \
@@ -215,7 +216,7 @@
                 \@$(PRIVATE_SRC_LIST_FILE) \
                 -J-Xmx1024m \
                 -XDignore.symbol.file \
-                $(if $(LEGACY_USE_JAVA7),,-Xdoclint:none) \
+                -Xdoclint:none \
                 $(PRIVATE_PROFILING_OPTIONS) \
                 $(addprefix -classpath ,$(PRIVATE_CLASSPATH)) \
                 $(addprefix -bootclasspath ,$(PRIVATE_BOOTCLASSPATH)) \
diff --git a/core/envsetup.mk b/core/envsetup.mk
index ccd156b..08b2321 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -84,6 +84,9 @@
 ifneq ($(TARGET_BUILD_APPS),)
 ALLOW_MISSING_DEPENDENCIES := true
 endif
+ifeq ($(TARGET_BUILD_PDK),true)
+ALLOW_MISSING_DEPENDENCIES := true
+endif
 ifneq ($(filter true,$(SOONG_ALLOW_MISSING_DEPENDENCIES)),)
 ALLOW_MISSING_DEPENDENCIES := true
 endif
diff --git a/core/java.mk b/core/java.mk
index 0a60b69..4cb8114 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -110,6 +110,7 @@
 endif
 
 full_classes_compiled_jar := $(intermediates.COMMON)/$(full_classes_compiled_jar_leaf)
+full_classes_processed_jar := $(intermediates.COMMON)/classes-processed.jar
 full_classes_desugar_jar := $(intermediates.COMMON)/classes-desugar.jar
 jarjar_leaf := classes-jarjar.jar
 full_classes_jarjar_jar := $(intermediates.COMMON)/$(jarjar_leaf)
@@ -446,18 +447,41 @@
 javac-check : $(full_classes_compiled_jar)
 javac-check-$(LOCAL_MODULE) : $(full_classes_compiled_jar)
 
+ifdef LOCAL_JAR_PROCESSOR
+# LOCAL_JAR_PROCESSOR_ARGS must be evaluated here to set up the rule-local
+# PRIVATE_JAR_PROCESSOR_ARGS variable, but $< and $@ are not available yet.
+# Set ${in} and ${out} so they can be referenced by LOCAL_JAR_PROCESSOR_ARGS
+# using deferred evaluation (LOCAL_JAR_PROCESSOR_ARGS = instead of :=).
+in := $(full_classes_compiled_jar)
+out := $(full_classes_processed_jar).tmp
+$(full_classes_processed_jar): PRIVATE_JAR_PROCESSOR_ARGS := $(LOCAL_JAR_PROCESSOR_ARGS)
+$(full_classes_processed_jar): PRIVATE_JAR_PROCESSOR := $(HOST_OUT_JAVA_LIBRARIES)/$(LOCAL_JAR_PROCESSOR).jar
+$(full_classes_processed_jar): PRIVATE_TMP_OUT := $(out)
+in :=
+out :=
+
+$(full_classes_processed_jar): $(full_classes_compiled_jar) $(LOCAL_JAR_PROCESSOR)
+	@echo Processing $@ with $(PRIVATE_JAR_PROCESSOR)
+	$(hide) rm -f $@ $(PRIVATE_TMP_OUT)
+	$(hide) java -jar $(PRIVATE_JAR_PROCESSOR) $(PRIVATE_JAR_PROCESSOR_ARGS)
+	$(hide) mv $(PRIVATE_TMP_OUT) $@
+
+else
+full_classes_processed_jar := $(full_classes_compiled_jar)
+endif
+
 my_desugaring :=
 ifndef LOCAL_JACK_ENABLED
 ifndef LOCAL_IS_STATIC_JAVA_LIBRARY
 my_desugaring := true
 $(full_classes_desugar_jar): PRIVATE_DX_FLAGS := $(LOCAL_DX_FLAGS)
-$(full_classes_desugar_jar): $(full_classes_compiled_jar) $(DESUGAR)
+$(full_classes_desugar_jar): $(full_classes_processed_jar) $(DESUGAR)
 	$(desugar-classes-jar)
 endif
 endif
 
 ifndef my_desugaring
-full_classes_desugar_jar := $(full_classes_compiled_jar)
+full_classes_desugar_jar := $(full_classes_processed_jar)
 endif
 
 # Run jarjar if necessary
diff --git a/core/java_common.mk b/core/java_common.mk
index 43a23df..3c9b18f 100644
--- a/core/java_common.mk
+++ b/core/java_common.mk
@@ -19,12 +19,7 @@
   ifneq (,$(filter $(LOCAL_SDK_VERSION), $(private_sdk_versions_without_any_java_18_support)))
     LOCAL_JAVA_LANGUAGE_VERSION := 1.7
   else
-    # This retains 1.7 for ART build bots only. http://b/27583810
-    ifeq (,$(LEGACY_USE_JAVA7))
-      LOCAL_JAVA_LANGUAGE_VERSION := 1.8
-    else
-      LOCAL_JAVA_LANGUAGE_VERSION := 1.7
-    endif
+    LOCAL_JAVA_LANGUAGE_VERSION := 1.8
   endif
 endif
 LOCAL_JAVACFLAGS += -source $(LOCAL_JAVA_LANGUAGE_VERSION) -target $(LOCAL_JAVA_LANGUAGE_VERSION)
diff --git a/core/main.mk b/core/main.mk
index 0bb887c..bc4ed04 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -91,7 +91,7 @@
 # These are the modifier targets that don't do anything themselves, but
 # change the behavior of the build.
 # (must be defined before including definitions.make)
-INTERNAL_MODIFIER_TARGETS := showcommands all
+INTERNAL_MODIFIER_TARGETS := all
 
 # EMMA_INSTRUMENT_STATIC merges the static emma library to each emma-enabled module.
 ifeq (true,$(EMMA_INSTRUMENT_STATIC))
@@ -326,7 +326,7 @@
 endif
 
 
-# If they only used the modifier goals (showcommands, etc), we'll actually
+# If they only used the modifier goals (all, etc), we'll actually
 # build the default target.
 ifeq ($(filter-out $(INTERNAL_MODIFIER_TARGETS),$(MAKECMDGOALS)),)
 .PHONY: $(INTERNAL_MODIFIER_TARGETS)
@@ -409,6 +409,8 @@
 include $(BUILD_SYSTEM)/pdk_fusion_modules.mk
 endif # PDK_FUSION_PLATFORM_ZIP
 
+droid_targets : blueprint_tools
+
 endif # dont_bother
 
 endif # ONE_SHOT_MAKEFILE
@@ -1120,8 +1122,6 @@
 .PHONY: findbugs
 findbugs: $(INTERNAL_FINDBUGS_HTML_TARGET) $(INTERNAL_FINDBUGS_XML_TARGET)
 
-# The rules for dataclean and installclean are defined in cleanbuild.mk.
-
 #xxx scrape this from ALL_MODULE_NAME_TAGS
 .PHONY: modules
 modules:
@@ -1129,10 +1129,6 @@
 	@echo "$(call module-names-for-tag-list,$(ALL_MODULE_TAGS))" | \
 	      tr -s ' ' '\n' | sort -u | $(COLUMN)
 
-.PHONY: showcommands
-showcommands:
-	@echo >/dev/null
-
 .PHONY: nothing
 nothing:
 	@echo Successfully read the makefiles.
diff --git a/core/ninja_config.mk b/core/ninja_config.mk
index f456b8b..ca2dcee 100644
--- a/core/ninja_config.mk
+++ b/core/ninja_config.mk
@@ -7,18 +7,14 @@
 KATI_OUTPUT_PATTERNS := $(OUT_DIR)/build%.ninja $(OUT_DIR)/ninja%.sh
 
 # Modifier goals we don't need to pass to Ninja.
-NINJA_EXCLUDE_GOALS := showcommands all dist
-.PHONY : $(NINJA_EXCLUDE_GOALS)
+NINJA_EXCLUDE_GOALS := all dist APP-% PRODUCT-%
 
 # A list of goals which affect parsing of makefiles and we need to pass to Kati.
 PARSE_TIME_MAKE_GOALS := \
 	$(PARSE_TIME_MAKE_GOALS) \
 	$(dont_bother_goals) \
 	all \
-	APP-% \
-	DUMP_% \
 	ECLIPSE-% \
-	PRODUCT-% \
 	AUX-% \
 	boottarball-nodeps \
 	brillo_tests \
@@ -67,5 +63,8 @@
     $(sort $(ORIGINAL_MAKECMDGOALS) $(MAKECMDGOALS)))
 # Goals we need to pass to Ninja.
 NINJA_GOALS := $(filter-out $(NINJA_EXCLUDE_GOALS), $(ANDROID_GOALS))
+ifndef NINJA_GOALS
+  NINJA_GOALS := droid
+endif
 # Goals we need to pass to Kati.
-KATI_GOALS := $(filter $(PARSE_TIME_MAKE_GOALS),  $(ANDROID_GOALS))
+KATI_GOALS := $(filter $(PARSE_TIME_MAKE_GOALS), $(ANDROID_GOALS))
diff --git a/core/product_config.mk b/core/product_config.mk
index e069ff1..3623aa6 100644
--- a/core/product_config.mk
+++ b/core/product_config.mk
@@ -88,6 +88,7 @@
 # Provide "PRODUCT-<prodname>-<goal>" targets, which lets you build
 # a particular configuration without needing to set up the environment.
 #
+ifndef KATI
 product_goals := $(strip $(filter PRODUCT-%,$(MAKECMDGOALS)))
 ifdef product_goals
   # Scrape the product and build names out of the goal,
@@ -113,54 +114,42 @@
     $(error "tests" has been deprecated as a build variant. Use it as a build goal instead.)
   endif
 
-  # The build server wants to do make PRODUCT-dream-installclean
-  # which really means TARGET_PRODUCT=dream make installclean.
+  # The build server wants to do make PRODUCT-dream-sdk
+  # which really means TARGET_PRODUCT=dream make sdk.
   ifneq ($(filter-out $(INTERNAL_VALID_VARIANTS),$(TARGET_BUILD_VARIANT)),)
-    MAKECMDGOALS := $(MAKECMDGOALS) $(TARGET_BUILD_VARIANT)
+    override MAKECMDGOALS := $(MAKECMDGOALS) $(TARGET_BUILD_VARIANT)
     TARGET_BUILD_VARIANT := userdebug
     default_goal_substitution :=
   else
-    default_goal_substitution := $(DEFAULT_GOAL)
+    default_goal_substitution := droid
   endif
 
   # Replace the PRODUCT-* goal with the build goal that it refers to.
   # Note that this will ensure that it appears in the same relative
   # position, in case it matters.
-  #
-  # Note that modifying this will not affect the goals that make will
-  # attempt to build, but it's important because we inspect this value
-  # in certain situations (like for "make sdk").
-  #
-  MAKECMDGOALS := $(patsubst $(goal_name),$(default_goal_substitution),$(MAKECMDGOALS))
-
-  # Define a rule for the PRODUCT-* goal, and make it depend on the
-  # patched-up command-line goals as well as any other goals that we
-  # want to force.
-  #
-.PHONY: $(goal_name)
-$(goal_name): $(MAKECMDGOALS)
+  override MAKECMDGOALS := $(patsubst $(goal_name),$(default_goal_substitution),$(MAKECMDGOALS))
 endif
+endif # !KATI
 # else: Use the value set in the environment or buildspec.mk.
 
 # ---------------------------------------------------------------
 # Provide "APP-<appname>" targets, which lets you build
 # an unbundled app.
 #
+ifndef KATI
 unbundled_goals := $(strip $(filter APP-%,$(MAKECMDGOALS)))
 ifdef unbundled_goals
   ifneq ($(words $(unbundled_goals)),1)
     $(error Only one APP-* goal may be specified; saw "$(unbundled_goals)")
   endif
   TARGET_BUILD_APPS := $(strip $(subst -, ,$(patsubst APP-%,%,$(unbundled_goals))))
-  ifneq ($(filter $(DEFAULT_GOAL),$(MAKECMDGOALS)),)
-    MAKECMDGOALS := $(patsubst $(unbundled_goals),,$(MAKECMDGOALS))
+  ifneq ($(filter droid,$(MAKECMDGOALS)),)
+    override MAKECMDGOALS := $(patsubst $(unbundled_goals),,$(MAKECMDGOALS))
   else
-    MAKECMDGOALS := $(patsubst $(unbundled_goals),$(DEFAULT_GOAL),$(MAKECMDGOALS))
+    override MAKECMDGOALS := $(patsubst $(unbundled_goals),droid,$(MAKECMDGOALS))
   endif
-
-.PHONY: $(unbundled_goals)
-$(unbundled_goals): $(MAKECMDGOALS)
 endif # unbundled_goals
+endif
 
 # Default to building dalvikvm on hosts that support it...
 ifeq ($(HOST_OS),linux)
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 977b35c..e21083d 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -81,6 +81,7 @@
 	echo '    "Device_uses_hwc2": $(if $(filter true,$(TARGET_USES_HWC2)),true,false),'; \
 	echo '    "Override_rs_driver": "$(OVERRIDE_RS_DRIVER)",'; \
 	echo '    "Treble": $(if $(filter true,$(PRODUCT_FULL_TREBLE)),true,false),'; \
+	echo '    "Pdk": $(if $(filter true,$(TARGET_BUILD_PDK)),true,false),'; \
 	echo ''; \
 	echo '    "ArtUseReadBarrier": $(if $(filter false,$(PRODUCT_ART_USE_READ_BARRIER)),false,true),'; \
 	echo ''; \
diff --git a/core/tasks/build_custom_images.mk b/core/tasks/build_custom_images.mk
index c5f2a96..0750217 100644
--- a/core/tasks/build_custom_images.mk
+++ b/core/tasks/build_custom_images.mk
@@ -37,6 +37,14 @@
 #   - 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
+#   - CUSTOM_IMAGE_AVB_HASH_ENABLE, set to "true" to add AVB HASH footer.
+#   - CUSTOM_IMAGE_AVB_ADD_HASH_FOOTER_ARGS, additional args of AVB HASH footer.
+#   - CUSTOM_IMAGE_AVB_HASHTREE_ENABLE, set to "true" to add AVB HASHTREE
+#     footer.
+#   - CUSTOM_IMAGE_AVB_ADD_HASHTREE_FOOTER_ARGS, additional args of AVB
+#     HASHTREE footer.
+#   - CUSTOM_IMAGE_AVB_KEY_PATH, custom AVB signing key.
+#   - CUSTOM_IMAGE_AVB_ALGORITHM, custom AVB signing algorithm.
 #
 # To build all those images, run "make custom_images".
 
@@ -54,8 +62,12 @@
   CUSTOM_IMAGE_SELINUX \
   CUSTOM_IMAGE_SUPPORT_VERITY \
   CUSTOM_IMAGE_VERITY_BLOCK_DEVICE \
-  CUSTOM_IMAGE_AVB_ENABLE \
+  CUSTOM_IMAGE_AVB_HASH_ENABLE \
+  CUSTOM_IMAGE_AVB_ADD_HASH_FOOTER_ARGS \
+  CUSTOM_IMAGE_AVB_HASHTREE_ENABLE \
   CUSTOM_IMAGE_AVB_ADD_HASHTREE_FOOTER_ARGS \
+  CUSTOM_IMAGE_AVB_KEY_PATH \
+  CUSTOM_IMAGE_AVB_ALGORITHM \
 
 # We don't expect product makefile to inherit/override PRODUCT_CUSTOM_IMAGE_MAKEFILES,
 # so we don't put it in the _product_var_list.
diff --git a/core/tasks/tools/build_custom_image.mk b/core/tasks/tools/build_custom_image.mk
index f916e86..8c098d6 100644
--- a/core/tasks/tools/build_custom_image.mk
+++ b/core/tasks/tools/build_custom_image.mk
@@ -62,6 +62,14 @@
   $(eval my_image_copy_files += $(src))\
   $(eval my_copy_pairs += $(src):$(my_staging_dir)/$(word 2,$(pair))))
 
+ifndef CUSTOM_IMAGE_AVB_KEY_PATH
+# If key path isn't specified, use the default signing args.
+my_avb_signing_args := $(INTERNAL_AVB_SIGNING_ARGS)
+else
+my_avb_signing_args := \
+  --algorithm $(CUSTOM_IMAGE_AVB_ALGORITHM) --key $(CUSTOM_IMAGE_AVB_KEY_PATH)
+endif
+
 $(my_built_custom_image): PRIVATE_INTERMEDIATES := $(intermediates)
 $(my_built_custom_image): PRIVATE_MOUNT_POINT := $(CUSTOM_IMAGE_MOUNT_POINT)
 $(my_built_custom_image): PRIVATE_PARTITION_SIZE := $(CUSTOM_IMAGE_PARTITION_SIZE)
@@ -74,10 +82,16 @@
 $(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): PRIVATE_AVB_ENABLE := $(CUSTOM_IMAGE_AVB_ENABLE)
+$(my_built_custom_image): PRIVATE_AVB_AVBTOOL := $(AVBTOOL)
+$(my_built_custom_image): PRIVATE_AVB_SIGNING_ARGS := $(my_avb_signing_args)
+$(my_built_custom_image): PRIVATE_AVB_HASH_ENABLE := $(CUSTOM_IMAGE_AVB_HASH_ENABLE)
+$(my_built_custom_image): PRIVATE_AVB_ADD_HASH_FOOTER_ARGS := $(CUSTOM_IMAGE_AVB_ADD_HASH_FOOTER_ARGS)
+$(my_built_custom_image): PRIVATE_AVB_HASHTREE_ENABLE := $(CUSTOM_IMAGE_AVB_HASHTREE_ENABLE)
 $(my_built_custom_image): PRIVATE_AVB_ADD_HASHTREE_FOOTER_ARGS := $(CUSTOM_IMAGE_AVB_ADD_HASHTREE_FOOTER_ARGS)
-ifeq (true,$(CUSTOM_IMAGE_AVB_ENABLE))
+ifeq (true,$(filter true, $(CUSTOM_IMAGE_AVB_HASH_ENABLE) $(CUSTOM_IMAGE_AVB_HASHTREE_ENABLE)))
   $(my_built_custom_image): $(AVBTOOL)
+else ifneq (,$(filter true, $(CUSTOM_IMAGE_AVB_HASH_ENABLE) $(CUSTOM_IMAGE_AVB_HASHTREE_ENABLE)))
+  $(error Cannot set both CUSTOM_IMAGE_AVB_HASH_ENABLE and CUSTOM_IMAGE_AVB_HASHTREE_ENABLE to true)
 endif
 $(my_built_custom_image): $(INTERNAL_USERIMAGES_DEPS) $(my_built_modules) $(my_image_copy_files) \
   $(CUSTOM_IMAGE_DICT_FILE)
@@ -93,6 +107,7 @@
 	# Generate the dict.
 	$(hide) echo "# For all accepted properties, see BuildImage() in tools/releasetools/build_image.py" > $(PRIVATE_INTERMEDIATES)/image_info.txt
 	$(hide) echo "mount_point=$(PRIVATE_MOUNT_POINT)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt
+	$(hide) echo "partition_name=$(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
 	$(hide) echo "ext_mkuserimg=$(notdir $(MKEXTUSERIMG))" >> $(PRIVATE_INTERMEDIATES)/image_info.txt
@@ -102,10 +117,13 @@
 	    echo "verity_key=$(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_AVB_ENABLE),\
-	  $(hide) echo "avb_enable=$(PRIVATE_AVB_ENABLE)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt;\
-	    echo "avb_avbtool=$(AVBTOOL)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt;\
-	    echo "avb_signing_args=$(INTERNAL_AVB_SIGNING_ARGS)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt;\
+	$(hide) echo "avb_avbtool=$(PRIVATE_AVB_AVBTOOL)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt
+	$(hide) echo "avb_signing_args=$(PRIVATE_AVB_SIGNING_ARGS)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt
+	$(if $(PRIVATE_AVB_HASH_ENABLE),\
+	  $(hide) echo "avb_hash_enable=$(PRIVATE_AVB_HASH_ENABLE)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt;\
+	    echo "avb_add_hash_footer_args=$(PRIVATE_AVB_ADD_HASH_FOOTER_ARGS)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt)
+	$(if $(PRIVATE_AVB_HASHTREE_ENABLE),\
+	  $(hide) echo "avb_hashtree_enable=$(PRIVATE_AVB_HASHTREE_ENABLE)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt;\
 	    echo "avb_add_hashtree_footer_args=$(PRIVATE_AVB_ADD_HASHTREE_FOOTER_ARGS)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt)
 	$(if $(PRIVATE_DICT_FILE),\
 	  $(hide) echo "# Properties from $(PRIVATE_DICT_FILE)" >> $(PRIVATE_INTERMEDIATES)/image_info.txt;\
diff --git a/tools/releasetools/add_img_to_target_files.py b/tools/releasetools/add_img_to_target_files.py
index 82394ca..550a5fb 100755
--- a/tools/releasetools/add_img_to_target_files.py
+++ b/tools/releasetools/add_img_to_target_files.py
@@ -69,6 +69,7 @@
 
 OPTIONS.add_missing = False
 OPTIONS.rebuild_recovery = False
+OPTIONS.replace_recovery_patch_files_list = []
 OPTIONS.replace_verity_public_key = False
 OPTIONS.replace_verity_private_key = False
 OPTIONS.is_signing = False
@@ -127,6 +128,12 @@
     ofile.write(data)
     ofile.close()
 
+    arc_name = "SYSTEM/" + fn
+    if arc_name in output_zip.namelist():
+      OPTIONS.replace_recovery_patch_files_list.append(arc_name)
+    else:
+      common.ZipWrite(output_zip, ofile.name, arc_name)
+
   if OPTIONS.rebuild_recovery:
     print("Building new recovery patch")
     common.MakeRecoveryPatch(OPTIONS.input_tmp, output_sink, recovery_img,
@@ -385,6 +392,23 @@
   img.Write()
 
 
+def ReplaceRecoveryPatchFiles(zip_filename):
+  """Update the related files under SYSTEM/ after rebuilding recovery."""
+
+  cmd = ["zip", "-d", zip_filename] + OPTIONS.replace_recovery_patch_files_list
+  p = common.Run(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+  p.communicate()
+
+  output_zip = zipfile.ZipFile(zip_filename, "a",
+                               compression=zipfile.ZIP_DEFLATED,
+                               allowZip64=True)
+  for item in OPTIONS.replace_recovery_patch_files_list:
+    file_path = os.path.join(OPTIONS.input_tmp, item)
+    assert os.path.exists(file_path)
+    common.ZipWrite(output_zip, file_path, arcname=item)
+  common.ZipClose(output_zip)
+
+
 def AddImagesToTargetFiles(filename):
   if os.path.isdir(filename):
     OPTIONS.input_tmp = os.path.abspath(filename)
@@ -558,6 +582,9 @@
 
   if output_zip:
     common.ZipClose(output_zip)
+    if OPTIONS.replace_recovery_patch_files_list:
+      ReplaceRecoveryPatchFiles(output_zip.filename)
+
 
 def main(argv):
   def option_handler(o, a):
diff --git a/tools/releasetools/build_image.py b/tools/releasetools/build_image.py
index 3094dca..05c895a 100755
--- a/tools/releasetools/build_image.py
+++ b/tools/releasetools/build_image.py
@@ -97,18 +97,19 @@
   simg = sparse_img.SparseImage(image_file, mode="r+b", build_map=False)
   simg.AppendFillChunk(0, blocks)
 
-def AVBCalcMaxImageSize(avbtool, partition_size, additional_args):
+def AVBCalcMaxImageSize(avbtool, footer_type, partition_size, additional_args):
   """Calculates max image size for a given partition size.
 
   Args:
     avbtool: String with path to avbtool.
+    footer_type: 'hash' or 'hashtree' for generating footer.
     partition_size: The size of the partition in question.
     additional_args: Additional arguments to pass to 'avbtool
       add_hashtree_image'.
   Returns:
     The maximum image size or 0 if an error occurred.
   """
-  cmdline = "%s add_hashtree_footer " % avbtool
+  cmdline = "%s add_%s_footer " % (avbtool, footer_type)
   cmdline += "--partition_size %d " % partition_size
   cmdline += "--calc_max_image_size "
   cmdline += additional_args
@@ -118,13 +119,14 @@
   else:
     return int(output)
 
-def AVBAddHashtree(image_path, avbtool, partition_size, partition_name,
-                   signing_args, additional_args):
+def AVBAddFooter(image_path, avbtool, footer_type, partition_size,
+                 partition_name, signing_args, additional_args):
   """Adds dm-verity hashtree and AVB metadata to an image.
 
   Args:
     image_path: Path to image to modify.
     avbtool: String with path to avbtool.
+    footer_type: 'hash' or 'hashtree' for generating footer.
     partition_size: The size of the partition in question.
     partition_name: The name of the partition - will be embedded in metadata.
     signing_args: Arguments for signing the image.
@@ -133,7 +135,7 @@
   Returns:
     True if the operation succeeded.
   """
-  cmdline = "%s add_hashtree_footer " % avbtool
+  cmdline = "%s add_%s_footer " % (avbtool, footer_type)
   cmdline += "--partition_size %d " % partition_size
   cmdline += "--partition_name %s " % partition_name
   cmdline += "--image %s " % image_path
@@ -410,12 +412,19 @@
     prop_dict["original_partition_size"] = str(partition_size)
     prop_dict["verity_size"] = str(verity_size)
 
-  # Adjust partition size for AVB.
-  if prop_dict.get("avb_enable") == "true":
+  # Adjust partition size for AVB hash footer or AVB hashtree footer.
+  avb_footer_type = ''
+  if prop_dict.get("avb_hash_enable") == "true":
+    avb_footer_type = 'hash'
+  elif prop_dict.get("avb_hashtree_enable") == "true":
+    avb_footer_type = 'hashtree'
+
+  if avb_footer_type:
     avbtool = prop_dict.get("avb_avbtool")
     partition_size = int(prop_dict.get("partition_size"))
-    additional_args = prop_dict["avb_add_hashtree_footer_args"]
-    max_image_size = AVBCalcMaxImageSize(avbtool, partition_size,
+    # avb_add_hash_footer_args or avb_add_hashtree_footer_args.
+    additional_args = prop_dict["avb_add_" + avb_footer_type + "_footer_args"]
+    max_image_size = AVBCalcMaxImageSize(avbtool, avb_footer_type, partition_size,
                                          additional_args)
     if max_image_size == 0:
       return False
@@ -561,15 +570,16 @@
     if not MakeVerityEnabledImage(out_file, verity_fec_supported, prop_dict):
       return False
 
-  # Add AVB hashtree and metadata.
-  if "avb_enable" in prop_dict:
+  # Add AVB HASH or HASHTREE footer (metadata).
+  if avb_footer_type:
     avbtool = prop_dict.get("avb_avbtool")
     original_partition_size = int(prop_dict.get("original_partition_size"))
     partition_name = prop_dict["partition_name"]
     signing_args = prop_dict["avb_signing_args"]
-    additional_args = prop_dict["avb_add_hashtree_footer_args"]
-    if not AVBAddHashtree(out_file, avbtool, original_partition_size,
-                          partition_name, signing_args, additional_args):
+    # avb_add_hash_footer_args or avb_add_hashtree_footer_args
+    additional_args = prop_dict["avb_add_" + avb_footer_type + "_footer_args"]
+    if not AVBAddFooter(out_file, avbtool, avb_footer_type, original_partition_size,
+                      partition_name, signing_args, additional_args):
       return False
 
   if run_fsck and prop_dict.get("skip_fsck") != "true":
@@ -639,7 +649,7 @@
     copy_prop("system_squashfs_block_size", "squashfs_block_size")
     copy_prop("system_squashfs_disable_4k_align", "squashfs_disable_4k_align")
     copy_prop("system_base_fs_file", "base_fs_file")
-    copy_prop("system_avb_enable", "avb_enable")
+    copy_prop("system_avb_hashtree_enable", "avb_hashtree_enable")
     copy_prop("system_avb_add_hashtree_footer_args",
               "avb_add_hashtree_footer_args")
     copy_prop("system_extfs_inode_count", "extfs_inode_count")
@@ -656,7 +666,7 @@
     copy_prop("system_squashfs_compressor_opt", "squashfs_compressor_opt")
     copy_prop("system_squashfs_block_size", "squashfs_block_size")
     copy_prop("system_base_fs_file", "base_fs_file")
-    copy_prop("system_avb_enable", "avb_enable")
+    copy_prop("system_avb_hashtree_enable", "avb_hashtree_enable")
     copy_prop("system_avb_add_hashtree_footer_args",
               "avb_add_hashtree_footer_args")
     copy_prop("system_extfs_inode_count", "extfs_inode_count")
@@ -681,7 +691,7 @@
     copy_prop("vendor_squashfs_block_size", "squashfs_block_size")
     copy_prop("vendor_squashfs_disable_4k_align", "squashfs_disable_4k_align")
     copy_prop("vendor_base_fs_file", "base_fs_file")
-    copy_prop("vendor_avb_enable", "avb_enable")
+    copy_prop("vendor_avb_hashtree_enable", "avb_hashtree_enable")
     copy_prop("vendor_avb_add_hashtree_footer_args",
               "avb_add_hashtree_footer_args")
     copy_prop("vendor_extfs_inode_count", "extfs_inode_count")
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 925a523..c022d24 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -491,7 +491,7 @@
 
   # AVB: if enabled, calculate and add hash to boot.img.
   if info_dict.get("board_avb_enable", None) == "true":
-    avbtool = os.getenv('AVBTOOL') or "avbtool"
+    avbtool = os.getenv('AVBTOOL') or OPTIONS.info_dict["avb_avbtool"]
     part_size = info_dict.get("boot_size", None)
     cmd = [avbtool, "add_hash_footer", "--image", img.name,
            "--partition_size", str(part_size), "--partition_name", "boot"]
diff --git a/tools/releasetools/edify_generator.py b/tools/releasetools/edify_generator.py
index 2a9a417..7883fe6 100644
--- a/tools/releasetools/edify_generator.py
+++ b/tools/releasetools/edify_generator.py
@@ -230,11 +230,6 @@
           p.mount_point, mount_flags))
       self.mounts.add(p.mount_point)
 
-  def UnpackPackageDir(self, src, dst):
-    """Unpack a given directory from the OTA package into the given
-    destination directory."""
-    self.script.append('package_extract_dir("%s", "%s");' % (src, dst))
-
   def Comment(self, comment):
     """Write a comment into the update script."""
     self.script.append("")
diff --git a/tools/releasetools/img_from_target_files.py b/tools/releasetools/img_from_target_files.py
index fd98ad2..4422b53 100755
--- a/tools/releasetools/img_from_target_files.py
+++ b/tools/releasetools/img_from_target_files.py
@@ -71,63 +71,23 @@
     common.Usage(__doc__)
     sys.exit(1)
 
-  OPTIONS.input_tmp, input_zip = common.UnzipTemp(args[0])
+  OPTIONS.input_tmp, input_zip = common.UnzipTemp(
+      args[0], ["IMAGES/*", "OTA/*"])
   output_zip = zipfile.ZipFile(args[1], "w", compression=zipfile.ZIP_DEFLATED)
   CopyInfo(output_zip)
 
   try:
-    done = False
     images_path = os.path.join(OPTIONS.input_tmp, "IMAGES")
-    if os.path.exists(images_path):
-      # If this is a new target-files, it already contains the images,
-      # and all we have to do is copy them to the output zip.
-      images = os.listdir(images_path)
-      if images:
-        for image in images:
-          if bootable_only and image not in ("boot.img", "recovery.img"):
-            continue
-          if not image.endswith(".img"):
-            continue
-          if image == "recovery-two-step.img":
-            continue
-          common.ZipWrite(
-              output_zip, os.path.join(images_path, image), image)
-        done = True
-
-    if not done:
-      # We have an old target-files that doesn't already contain the
-      # images, so build them.
-      import add_img_to_target_files
-
-      OPTIONS.info_dict = common.LoadInfoDict(input_zip, OPTIONS.input_tmp)
-
-      boot_image = common.GetBootableImage(
-          "boot.img", "boot.img", OPTIONS.input_tmp, "BOOT")
-      if boot_image:
-        boot_image.AddToZip(output_zip)
-
-      if OPTIONS.info_dict.get("no_recovery") != "true":
-        recovery_image = common.GetBootableImage(
-            "recovery.img", "recovery.img", OPTIONS.input_tmp, "RECOVERY")
-        if recovery_image:
-          recovery_image.AddToZip(output_zip)
-
-      def banner(s):
-        print("\n\n++++ " + s + " ++++\n\n")
-
-      if not bootable_only:
-        banner("AddSystem")
-        add_img_to_target_files.AddSystem(output_zip, prefix="")
-        try:
-          input_zip.getinfo("VENDOR/")
-          banner("AddVendor")
-          add_img_to_target_files.AddVendor(output_zip, prefix="")
-        except KeyError:
-          pass   # no vendor partition for this device
-        banner("AddUserdata")
-        add_img_to_target_files.AddUserdata(output_zip, prefix="")
-        banner("AddCache")
-        add_img_to_target_files.AddCache(output_zip, prefix="")
+    # A target-files zip must contain the images since Lollipop.
+    assert os.path.exists(images_path)
+    for image in sorted(os.listdir(images_path)):
+      if bootable_only and image not in ("boot.img", "recovery.img"):
+        continue
+      if not image.endswith(".img"):
+        continue
+      if image == "recovery-two-step.img":
+        continue
+      common.ZipWrite(output_zip, os.path.join(images_path, image), image)
 
   finally:
     print("cleaning up...")
diff --git a/tools/releasetools/sign_target_files_apks.py b/tools/releasetools/sign_target_files_apks.py
index 394ad0a..b9bb4d0 100755
--- a/tools/releasetools/sign_target_files_apks.py
+++ b/tools/releasetools/sign_target_files_apks.py
@@ -92,7 +92,6 @@
 import errno
 import os
 import re
-import shutil
 import subprocess
 import tempfile
 import zipfile
@@ -104,6 +103,7 @@
 
 OPTIONS.extra_apks = {}
 OPTIONS.key_map = {}
+OPTIONS.rebuild_recovery = False
 OPTIONS.replace_ota_keys = False
 OPTIONS.replace_verity_public_key = False
 OPTIONS.replace_verity_private_key = False
@@ -186,27 +186,8 @@
   maxsize = max([len(os.path.basename(i.filename))
                  for i in input_tf_zip.infolist()
                  if i.filename.endswith('.apk')])
-  rebuild_recovery = False
   system_root_image = misc_info.get("system_root_image") == "true"
 
-  # tmpdir will only be used to regenerate the recovery-from-boot patch.
-  tmpdir = tempfile.mkdtemp()
-  def write_to_temp(fn, attr, data):
-    fn = os.path.join(tmpdir, fn)
-    if fn.endswith("/"):
-      fn = os.path.join(tmpdir, fn)
-      os.mkdir(fn)
-    else:
-      d = os.path.dirname(fn)
-      if d and not os.path.exists(d):
-        os.makedirs(d)
-
-      if attr >> 16 == 0xa1ff:
-        os.symlink(data, fn)
-      else:
-        with open(fn, "wb") as f:
-          f.write(data)
-
   for info in input_tf_zip.infolist():
     if info.filename.startswith("IMAGES/"):
       continue
@@ -237,21 +218,17 @@
       print "rewriting %s:" % (info.filename,)
       new_data = RewriteProps(data, misc_info)
       common.ZipWriteStr(output_tf_zip, out_info, new_data)
-      if info.filename in ("BOOT/RAMDISK/default.prop",
-                           "ROOT/default.prop",
-                           "RECOVERY/RAMDISK/default.prop"):
-        write_to_temp(info.filename, info.external_attr, new_data)
 
     elif info.filename.endswith("mac_permissions.xml"):
       print "rewriting %s with new keys." % (info.filename,)
       new_data = ReplaceCerts(data)
       common.ZipWriteStr(output_tf_zip, out_info, new_data)
 
-    # Trigger a rebuild of the recovery patch if needed.
+    # Ask add_img_to_target_files to rebuild the recovery patch if needed.
     elif info.filename in ("SYSTEM/recovery-from-boot.p",
                            "SYSTEM/etc/recovery.img",
                            "SYSTEM/bin/install-recovery.sh"):
-      rebuild_recovery = True
+      OPTIONS.rebuild_recovery = True
 
     # Don't copy OTA keys if we're replacing them.
     elif (OPTIONS.replace_ota_keys and
@@ -283,31 +260,12 @@
     elif info.filename == "META/care_map.txt":
       pass
 
-    # Copy BOOT/, RECOVERY/, META/, ROOT/ to rebuild recovery patch. This case
-    # must come AFTER other matching rules.
-    elif (info.filename.startswith("BOOT/") or
-          info.filename.startswith("RECOVERY/") or
-          info.filename.startswith("META/") or
-          info.filename.startswith("ROOT/") or
-          info.filename == "SYSTEM/etc/recovery-resource.dat"):
-      write_to_temp(info.filename, info.external_attr, data)
-      common.ZipWriteStr(output_tf_zip, out_info, data)
-
     # A non-APK file; copy it verbatim.
     else:
       common.ZipWriteStr(output_tf_zip, out_info, data)
 
   if OPTIONS.replace_ota_keys:
-    new_recovery_keys = ReplaceOtaKeys(input_tf_zip, output_tf_zip, misc_info)
-    if new_recovery_keys:
-      if system_root_image:
-        recovery_keys_location = "BOOT/RAMDISK/res/keys"
-      else:
-        recovery_keys_location = "RECOVERY/RAMDISK/res/keys"
-      # The "new_recovery_keys" has been already written into the output_tf_zip
-      # while calling ReplaceOtaKeys(). We're just putting the same copy to
-      # tmpdir in case we need to regenerate the recovery-from-boot patch.
-      write_to_temp(recovery_keys_location, 0o755 << 16, new_recovery_keys)
+    ReplaceOtaKeys(input_tf_zip, output_tf_zip, misc_info)
 
   # Replace the keyid string in META/misc_info.txt.
   if OPTIONS.replace_verity_private_key:
@@ -321,33 +279,13 @@
       dest = "BOOT/RAMDISK/verity_key"
     # We are replacing the one in boot image only, since the one under
     # recovery won't ever be needed.
-    new_data = ReplaceVerityPublicKey(
+    ReplaceVerityPublicKey(
         output_tf_zip, dest, OPTIONS.replace_verity_public_key[1])
-    write_to_temp(dest, 0o755 << 16, new_data)
 
   # Replace the keyid string in BOOT/cmdline.
   if OPTIONS.replace_verity_keyid:
-    new_cmdline = ReplaceVerityKeyId(input_tf_zip, output_tf_zip,
-      OPTIONS.replace_verity_keyid[1])
-    # Writing the new cmdline to tmpdir is redundant as the bootimage
-    # gets build in the add_image_to_target_files and rebuild_recovery
-    # is not exercised while building the boot image for the A/B
-    # path
-    write_to_temp("BOOT/cmdline", 0o755 << 16, new_cmdline)
-
-  if rebuild_recovery:
-    recovery_img = common.GetBootableImage(
-        "recovery.img", "recovery.img", tmpdir, "RECOVERY", info_dict=misc_info)
-    boot_img = common.GetBootableImage(
-        "boot.img", "boot.img", tmpdir, "BOOT", info_dict=misc_info)
-
-    def output_sink(fn, data):
-      common.ZipWriteStr(output_tf_zip, "SYSTEM/" + fn, data)
-
-    common.MakeRecoveryPatch(tmpdir, output_sink, recovery_img, boot_img,
-                             info_dict=misc_info)
-
-  shutil.rmtree(tmpdir)
+    ReplaceVerityKeyId(input_tf_zip, output_tf_zip,
+                       OPTIONS.replace_verity_keyid[1])
 
 
 def ReplaceCerts(data):
@@ -711,7 +649,12 @@
   common.ZipClose(output_zip)
 
   # Skip building userdata.img and cache.img when signing the target files.
-  new_args = ["--is_signing", args[1]]
+  new_args = ["--is_signing"]
+  # add_img_to_target_files builds the system image from scratch, so the
+  # recovery patch is guaranteed to be regenerated there.
+  if OPTIONS.rebuild_recovery:
+    new_args.append("--rebuild_recovery")
+  new_args.append(args[1])
   add_img_to_target_files.main(new_args)
 
   print "done."