| commit | 7028a608f9626989a8d287ec3e93576526f4b1de | [log] [tgz] |
|---|---|---|
| author | android-build-team Robot <android-build-team-robot@google.com> | Mon Apr 11 17:37:33 2022 +0000 |
| committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Mon Apr 11 17:37:33 2022 +0000 |
| tree | 50c60ff0f84207397dd4ce83dd68d53c0de09324 | |
| parent | a04b5d74ab2f56242f85bf26d1b724c9d2e21c3d [diff] | |
| parent | fe5ec3f911f02916fc91e21173df826f405b72c9 [diff] |
Snap for 7439149 from d79bbdd2ee939bea9447beaa597ab02904960f4e to sc-release am: 929cf45816 am: fe5ec3f911 Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/SdkExtensions/+/14910983 Change-Id: Id7bcde40fa230190d757d5624c0f9cd9386f646f Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
SdkExtensions module is responsible for:
The module is packaged in an apex, com.android.sdkext, and has several components:
bin/derive_classpath: a native binary that runs early in the device boot process. It reads individual classpath configs files from the system and other modules, merges them, and defines the definition of *CLASSPATH environ variables.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.derive_sdk is a program that reads metadata stored in other apex modules, in the form of binary protobuf files in subpath etc/sdkinfo.pb 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.
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).
derive_classpath service reads and merges individual config files in the /system/etc/classpaths/ and /apex/*/etc/classpaths. Each config stores protobuf message from classpaths.proto in a proto binary format. Exact merging algorithm that determines the order of the classpath entries is described in derive_classpath.cpp and may change over time.
For every new Android SDK level a new extension version should be defined. These are the steps necessary to do that:
derive_sdk.cpp by:GetSdkLevel with the new enum setderive_sdk_test.cpp verifying the new extensions worksSdkExtensions.getExtensionVersion API support the new extensions.