The Update subsystem helps you implement over the air \(OTA\) update of OpenHarmony devices. The update subsystem consists of the following:
1. Packaging tool
- Packaging tool
The packaging tool is developed using Python and deployed on the PC to prepare update packages. It packages each update image, signs the update package, generates the update package execution script, and finally creates an update package. After the execution script is run on a OpenHarmony device, the device parses and executes the script to complete the update process.
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The packaging tool signs the **update.bin** file and the generated update package \(**.zip** file\) independently.
2. Update service
- Update service
The update service is used to search, download, and trigger updates.
3. Updater
- Updater
The updater is the core module of the update subsystem. It provides the following functions:
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4. Installs the related component packages based on the update script.
5. Performs post-processing after the update is complete, for example, deleting the update package and recording the update status.
4. Update app
- Update app
The upgrade app is used to trigger search and download of update packages.
