1， ./mk otapackage
首先介绍一下update.zip
update.zip包的结构如下：
RECOVERY$ tree -L 2
├── kernel
├── ramdisk
└── RAMDISK
├── advanced_meta_init.rc
├── data
├── default.prop
├── dev
├── etc
├── init
├── init.factory.rc
├── init.goldfish.rc
├── init.mt6516.rc
├── init.rc
├── meta_init.rc
├── proc
├── res
├── sbin
├── sys
├── system
└── tmp
BOOT$ tree -L 2
├── kernel
├── ramdisk
└── RAMDISK
├── advanced_meta_init.rc
├── data
├── default.prop
├── dev
├── init
├── init.factory.rc
├── init.goldfish.rc
├── init.mt6516.rc
├── init.rc
├── meta_init.rc
├── proc
├── res -> /system/res
├── sbin
├── sys
└── system
OTA/bin$ tree
├── applypatch
├── applypatch_static
├── check_prereq
└── updater
META/filesystem_config.txt 并将其加入到 zip 包中。该文件保存了 system 目录下各目录、文件的权限及 owner.
$ head META/filesystem_config.txt
system 0 0 755
system/usr 0 0 755
system/usr/srec 0 0 755
system/usr/srec/config 0 0 755
system/usr/srec/config/en.us 0 0 755
system/usr/srec/config/en.us/grammars 0 0 755
system/usr/srec/config/en.us/grammars/phone_type_choice.g2g 0 0 644
system/usr/srec/config/en.us/grammars/VoiceDialer.g2g 0 0 644
system/usr/srec/config/en.us/grammars/boolean.g2g 0 0 644
system/usr/srec/config/en.us/g2p 0 0 755
编译脚本：
build/core/Makefile
1）update.zip名称与路径信息
name := $(TARGET_PRODUCT)
ifeq ($(TARGET_BUILD_TYPE),debug)
name := $(name)_debug
endif
name := $(name)-target_files-$(FILE_NAME_TAG)
intermediates := $(call intermediates-dir-for,PACKAGING,target_files)
BUILT_TARGET_FILES_PACKAGE := $(intermediates)/$(name).zip
2）OTA所需要的工具
built_ota_tools := \
$(call intermediates-dir-for,EXECUTABLES,applypatch)/applypatch \
$(call intermediates-dir-for,EXECUTABLES,applypatch_static)/applypatch_static \
$(call intermediates-dir-for,EXECUTABLES,check_prereq)/check_prereq \
$(call intermediates-dir-for,EXECUTABLES,sqlite3)/sqlite3 \
$(call intermediates-dir-for,EXECUTABLES,updater)/updater
3）包的组成部分
$(BUILT_TARGET_FILES_PACKAGE): \
$(INSTALLED_BOOTIMAGE_TARGET) \
$(INSTALLED_RADIOIMAGE_TARGET) \
$(INSTALLED_RECOVERYIMAGE_TARGET) \
$(INSTALLED_SYSTEMIMAGE) \
$(INSTALLED_USERDATAIMAGE_TARGET) \
$(INSTALLED_CACHEIMAGE_TARGET) \
$(INSTALLED_VENDORIMAGE_TARGET) \
$(INSTALLED_ANDROID_INFO_TXT_TARGET) \
$(SELINUX_FC) \
$(built_ota_tools) \
$(APKCERTS_FILE) \
$(HOST_OUT_EXECUTABLES)/fs_config \
| $(ACP)
完全升级OTA包的生成
1)OTA包的命名
# OTA update package
name := $(TARGET_PRODUCT)
ifeq ($(TARGET_BUILD_TYPE),debug)
name := $(name)_debug
endif
name := $(name)-ota
2）OTA包的生成路径
INTERNAL_OTA_PACKAGE_TARGET := $(PRODUCT_OUT)/$(name).zip
3）有update.zip包生成OTA包
ifneq ($(TARGET_USERIMAGES_USE_UBIFS),true)
$(hide) ./build/tools/releasetools/ota_from_target_files -v \
-n \跟时间戳没有关系，即前后版本可以互相升级
-p $(HOST_OUT) \路径
-k $(KEY_CERT_PAIR) \签名
$(BUILT_TARGET_FILES_PACKAGE) [email protected]
else
$(hide) ./build/tools/releasetools/ota_from_target_files -v \
-n \
-g \
-p $(HOST_OUT) \
-k $(KEY_CERT_PAIR) \
$(BUILT_TARGET_FILES_PACKAGE) [email protected]
Endif
4）通过伪目标启动生成OTA包
.PHONY: otapackage
otapackage: $(INTERNAL_OTA_PACKAGE_TARGET)