Implement LOCAL_COMPRESSED_MODULE.

- Prebuilts with LOCAL_MODULE_CLASS == APPS and BUILD_PACKAGE that
  define LOCAL_COMPRESSED_MODULE := true will be installed compressed
  in the system partition.
- The compression algorithm is simple gzip for now.

In addition :
- Compressed modules are not dex-preopted.
- JNI shared libraries are always embedded inside compressed modules,
  they are never installed as separate files on the FS.

Test: Manual
Bug: 63802184

Change-Id: Id12b1ff0b1d68791ec1178783f7e78910e122a33

core/clear_vars.mk

@@ -34,6 +34,7 @@ LOCAL_CLANG_LDFLAGS:=
 LOCAL_CLASSPATH:=
 LOCAL_COMPATIBILITY_SUITE:=
 LOCAL_COMPATIBILITY_SUPPORT_FILES:=
+LOCAL_COMPRESSED_MODULE:=
 LOCAL_CONLYFLAGS:=
 LOCAL_COPY_HEADERS:=
 LOCAL_COPY_HEADERS_TO:=

core/definitions.mk

@@ -2723,6 +2723,15 @@ $(hide) if ! $(ZIPALIGN) -c $(ZIPALIGN_PAGE_ALIGN_FLAGS) 4 $@ >/dev/null ; then
   fi
 endef
 
+# Compress a package using the standard gzip algorithm.
+define compress-package
+$(hide) \
+  mv $@ $@.uncompressed; \
+  $(MINIGZIP) -c $@.uncompressed > $@.compressed; \
+  rm -f $@.uncompressed; \
+  mv $@.compressed $@;
+endef
+
 # Remove dynamic timestamps from packages
 #
 define remove-timestamps-from-package

core/install_jni_libs.mk

@@ -32,6 +32,11 @@ else
     my_embed_jni := true
   endif
 endif
+# If we're installing this APP as a compressed module, we include all JNI libraries
+# in the compressed artifact, rather than as separate files on the partition in question.
+ifdef LOCAL_COMPRESSED_MODULE
+my_embed_jni := true
+endif
 
 jni_shared_libraries :=
 jni_shared_libraries_abis :=

core/package_internal.mk

@@ -215,8 +215,19 @@ R_file_stamp := $(intermediates.COMMON)/src/R.stamp
 LOCAL_INTERMEDIATE_TARGETS += $(R_file_stamp)
 endif
 
+ifdef LOCAL_COMPRESSED_MODULE
+ifneq (true,$(LOCAL_COMPRESSED_MODULE))
+$(call pretty-error, Unknown value for LOCAL_COMPRESSED_MODULE $(LOCAL_COMPRESSED_MODULE))
+endif
+endif
+
+ifdef LOCAL_COMPRESSED_MODULE
+LOCAL_BUILT_MODULE_STEM := package.apk.gz
+LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE).apk.gz
+else  # !LOCAL_COMPRESSED_MODULE
 LOCAL_BUILT_MODULE_STEM := package.apk
 LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE).apk
+endif
 
 LOCAL_PROGUARD_ENABLED:=$(strip $(LOCAL_PROGUARD_ENABLED))
 ifndef LOCAL_PROGUARD_ENABLED
@@ -307,6 +318,12 @@ LOCAL_RESOURCE_DIR := $(data_binding_res_out)
 LOCAL_AAPT_FLAGS += --auto-add-overlay --extra-packages com.android.databinding.library
 endif  # LOCAL_DATA_BINDING
 
+# If the module is a compressed module, we don't pre-opt it because its final
+# installation location will be the data partition.
+ifdef LOCAL_COMPRESSED_MODULE
+LOCAL_DEX_PREOPT := false
+endif
+
 include $(BUILD_SYSTEM)/android_manifest.mk
 
 #################################
@@ -358,6 +375,10 @@ installed_apk_splits :=
 my_apk_split_configs :=
 
 ifdef LOCAL_PACKAGE_SPLITS
+ifdef LOCAL_COMPRESSED_MODULE
+$(error $(LOCAL_MODULE): LOCAL_COMPRESSED_MODULE is not currently supported for split installs)
+endif  # LOCAL_COMPRESSED_MODULE
+
 my_apk_split_configs := $(LOCAL_PACKAGE_SPLITS)
 my_split_suffixes := $(subst $(comma),_,$(my_apk_split_configs))
 built_apk_splits := $(foreach s,$(my_split_suffixes),$(intermediates)/package_$(s).apk)
@@ -570,6 +591,9 @@ $(LOCAL_BUILT_MODULE): PRIVATE_RES_PACKAGE := $(my_res_package)
 $(LOCAL_BUILT_MODULE) : $(my_res_package) $(AAPT2) | $(ACP)
 else
 $(LOCAL_BUILT_MODULE) : $(all_res_assets) $(full_android_manifest) $(AAPT)
+endif
+ifdef LOCAL_COMPRESSED_MODULE
+$(LOCAL_BUILT_MODULE) : $(MINIGZIP)
 endif
 	@echo "target Package: $(PRIVATE_MODULE) ($@)"
 ifdef LOCAL_USE_AAPT2
@@ -606,6 +630,9 @@ ifneq (nostripping,$(LOCAL_DEX_PREOPT))
 endif
 endif
 	$(sign-package)
+ifdef LOCAL_COMPRESSED_MODULE
+	$(compress-package)
+endif  # LOCAL_COMPRESSED_MODULE
 
 ###############################
 ## Build dpi-specific apks, if it's apps_only build.

core/prebuilt_internal.mk

@@ -105,13 +105,33 @@ else
   prebuilt_module_is_dex_javalib :=
 endif
 
-ifeq ($(LOCAL_MODULE_CLASS),APPS)
-LOCAL_BUILT_MODULE_STEM := package.apk
-ifndef LOCAL_INSTALLED_MODULE_STEM
-LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE).apk
+ifdef LOCAL_COMPRESSED_MODULE
+ifneq (true,$(LOCAL_COMPRESSED_MODULE))
+$(call pretty-error, Unknown value for LOCAL_COMPRESSED_MODULE $(LOCAL_COMPRESSED_MODULE))
 endif
 endif
 
+ifeq ($(LOCAL_MODULE_CLASS),APPS)
+ifdef LOCAL_COMPRESSED_MODULE
+LOCAL_BUILT_MODULE_STEM := package.apk.gz
+else
+LOCAL_BUILT_MODULE_STEM := package.apk
+endif  # LOCAL_COMPRESSED_MODULE
+
+ifndef LOCAL_INSTALLED_MODULE_STEM
+ifdef LOCAL_COMPRESSED_MODULE
+LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE).apk.gz
+else
+LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE).apk
+endif  # LOCAL_COMPRESSED_MODULE
+endif  # LOCAL_INSTALLED_MODULE_STEM
+
+else  # $(LOCAL_MODULE_CLASS) != APPS)
+ifdef LOCAL_COMPRESSED_MODULE
+$(error $(LOCAL_MODULE) : LOCAL_COMPRESSED_MODULE can only be defined for module class APPS)
+endif  # LOCAL_COMPRESSED_MODULE
+endif
+
 ifneq ($(filter true keep_symbols no_debuglink mini-debug-info,$(my_strip_module) $(my_pack_module_relocations)),)
   ifdef LOCAL_IS_HOST_MODULE
     $(error Cannot strip/pack host module LOCAL_PATH=$(LOCAL_PATH))
@@ -314,6 +334,12 @@ LOCAL_DEX_PREOPT := false
 endif
 endif
 
+# If the module is a compressed module, we don't pre-opt it because its final
+# installation location will be the data partition.
+ifdef LOCAL_COMPRESSED_MODULE
+LOCAL_DEX_PREOPT := false
+endif
+
 #######################################
 # defines built_odex along with rule to install odex
 include $(BUILD_SYSTEM)/dex_preopt_odex_install.mk
@@ -338,6 +364,10 @@ embedded_prebuilt_jni_libs := 'lib/*.so'
 endif
 $(built_module): PRIVATE_EMBEDDED_JNI_LIBS := $(embedded_prebuilt_jni_libs)
 
+ifdef LOCAL_COMPRESSED_MODULE
+$(built_module) : $(MINIGZIP)
+endif
+
 $(built_module) : $(my_prebuilt_src_file) | $(ZIPALIGN) $(SIGNAPK_JAR)
 	$(transform-prebuilt-to-target)
 	$(uncompress-shared-libs)
@@ -359,6 +389,9 @@ endif  # LOCAL_DEX_PREOPT
 else  # LOCAL_CERTIFICATE == PRESIGNED
 	$(align-package)
 endif  # LOCAL_CERTIFICATE
+ifdef LOCAL_COMPRESSED_MODULE
+	$(compress-package)
+endif  # LOCAL_COMPRESSED_MODULE
 endif  # ! LOCAL_REPLACE_PREBUILT_APK_INSTALLED
 
 ###############################
@@ -371,6 +404,10 @@ endif
 ###############################
 ## Install split apks.
 ifdef LOCAL_PACKAGE_SPLITS
+ifdef LOCAL_COMPRESSED_MODULE
+$(error $(LOCAL_MODULE): LOCAL_COMPRESSED_MODULE is not currently supported for split installs)
+endif  # LOCAL_COMPRESSED_MODULE
+
 # LOCAL_PACKAGE_SPLITS is a list of apks to be installed.
 built_apk_splits := $(addprefix $(intermediates)/,$(notdir $(LOCAL_PACKAGE_SPLITS)))
 installed_apk_splits := $(addprefix $(my_module_path)/,$(notdir $(LOCAL_PACKAGE_SPLITS)))