Google Git
Sign in
android / platform / packages / modules / SdkExtensions / 8ce3aed
commit8ce3aed75c6b9c5326a459ad5ad93a5d73decdfe[log] [tgz]
authoreasoncylee <easoncylee@google.com>Tue Apr 13 10:28:53 2021 +0800
committereasoncylee <easoncylee@google.com>Tue Apr 13 10:28:53 2021 +0800
treebb243a4f014dbfdc03443adb2d57e5e11ca444cc
parentda839529f481bdf20c2f2e2aaae6edc746d5cfa0 [diff]
Move sdkextensions_e2e_tests to group presubmit-large

The test config takes longer than 15mins to run. Move it to a dedicated
group for running slow presubmit Test Mapping test.

Some more context is in the referenced bug, e.g, b/174495337
The group will work exactly the same as presubmit for now.

Bug: 174654670
Bug: 174495337
Test: none
Change-Id: Id7e18f2d8ca680a192d1fe55560d6927d347d7a3
1 file changed
tree: bb243a4f014dbfdc03443adb2d57e5e11ca444cc
  1. derive_classpath/
  2. derive_sdk/
  3. framework/
  4. gen_sdk/
  5. proto/
  6. testing/
  7. tests/
  8. Android.bp
  9. com.android.sdkext.avbpubkey
  10. com.android.sdkext.pem
  11. com.android.sdkext.pk8
  12. com.android.sdkext.x509.pem
  13. gen_sdkinfo.py
  14. manifest.json
  15. OWNERS
  16. PREUPLOAD.cfg
  17. README.md
  18. TEST_MAPPING
README.md

SdkExtensions module

SdkExtensions is a module that decides the extension SDK level of the device, and provides APIs for applications to query the extension SDK level.

General information

Structure

The module is packaged in an apex, com.android.sdkext, and has two components:

  • bin/derive_sdk: Native binary that runs early in the device boot process and reads metadata of other modules, to set system properties relating to the extension SDK (for instance build.version.extensions.r).
  • javalib/framework-sdkextension.jar: This is a jar on the bootclasspath that exposes APIs to applications to query the extension SDK level.

Deriving extension SDK level

derive_sdk is a program that reads metadata stored in other apex modules, in the form of binary protobuf files in subpath etc/sdkinfo.binarypb inside each apex. The structure of this protobuf can be seen here. The exact steps for converting a set of metadata files to actual extension versions is likely to change over time, and should not be depended upon.

Reading extension SDK level

The module exposes a java class SdkExtensions in the package android.os.ext. The method getExtensionVersion(int) can be used to read the version of a particular sdk extension, e.g. getExtensionVersion(Build.VERSION_CODES.R).

Developer information

Adding a new extension version

For every new Android SDK level a new extension version should be defined. These are the steps necessary to do that:

  • Add the new modules in this extension version to the SdkModule enum in sdk.proto.
  • Update derive_sdk.cpp by:
  • mapping the modules' package names to the new enum values
  • creating a new set with the new enum values
  • set a new sysprop to the value of GetSdkLevel with the new enum set
  • add a unit test to derive_sdk_test.cpp verifying the new extensions works
  • Make the SdkExtensions.getExtensionVersion API support the new extensions.
  • Extend the CTS test to verify the above two behaviors.
  • Update RollbackManagerServiceImpl#getExtensionVersions to account for the new extension version.