Updater

Simple application to download and apply OTA packages.

Server requirements

The app sends GET requests to the URL defined by the updater_server_url resource (or the euclid.updater.uri system property) and expects as response a JSON with the following structure:

{
  "response": [
    {
      "timestamp": 1230764400,
      "filename": "ota-package.zip",
      "sha256": "5eb63bbbe01eeed093cb22bb8f5acdc3",
      "buildtype": "nightly",
      "size": 314572800,
      "download": "https://example.com/ota-package.zip",
      "version": "15.1"
    }
  ]
}

The timestamp attribute is the build date expressed as UNIX timestamp.
The filename attribute is the name of the file to be downloaded.
The sha256 attribute is a string that uniquely identifies the update.
The buildtype attribute is the string to be compared with the ro.euclid.releasevarient property. The size attribute is the size of the update expressed in bytes.
The download attribute is the URL of the file to be downloaded.
The version attribute is the string to be compared with the ro.euclid.version property.

Additional attributes are ignored.

Build with Android Studio

Updater needs access to the system API, therefore it can't be built only using the public SDK. You first need to generate the libraries with all the needed classes. The application also needs elevated privileges, so you need to sign it with the right key to update the one in the system partition. To do this:

• Place this directory anywhere in the Android source tree
• Generate a keystore and keystore.properties using gen-keystore.sh
• Build the dependencies running make UpdaterStudio from the root of the Android source tree. This command will add the needed libraries in system_libraries/.

You need to do the above once, unless Android Studio can't find some symbol. In this case, rebuild the system libraries with make UpdaterStudio.