/base/update/packaging_tools
├── lib                         # 制作升级包工具依赖库目录
├── blocks_manager.py           # BlocksManager类定义，用于block块管理
├── build_update.py             # 差分包制作工具入口代码，入口参数定义
├── gigraph_process.py          # 生成Stash，重置ActionList的顺序
├── image_class.py              # 全量镜像、稀疏镜像解析处理
├── log_exception.py            # 全局log系统定义，自定义exception
├── patch_package_process.py    # 差分镜像处理，Block差分获取patch差异
├── script_generator.py         # 升级脚本生成器
├── transfers_manager.py        # 创建ActionInfo对象
├── update_package.py           # 升级包格式管理、升级包写入
├── utils.py                    # Options管理,其他相关功能函数定义
└── vendor_script.py            # 厂商升级流程脚本扩展
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positional arguments:
target_package         Target package file path.
update_package        Update package file path.
optional arguments:
-h, --help                                                show this help message and exit
-s SOURCE_PACKAGE, --source_package SOURCE_PACKAGE        Source package file path.
-nz, --no_zip                                             No zip mode, Output update package without zip.
-pf PARTITION_FILE, --partition_file PARTITION_FILE       Variable partition mode, Partition list file path.
-sa {ECC,RSA}, --signing_algorithm {ECC,RSA}              The signing algorithm supported by the tool include['ECC', 'RSA'].
-ha {sha256,sha384}, --hash_algorithm {sha256,sha384}     The hash algorithm  supported by the tool include ['sha256', 'sha384'].
-pk PRIVATE_KEY, --private_key PRIVATE_KEY                Private key file path.
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python build_update.py ./target/ ./target/package -pk ./target/updater_config/rsa_private_key2048.pem
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python build_update.py -s source.zip ./target/ ./target/package -pk./target/updater_config/rsa_private_key2048.pem
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