commit | c9b5f1569ae763e751d0add6597180d5c3b66c79 | [log] [tgz] |
---|---|---|
author | TreeHugger Robot <treehugger-gerrit@google.com> | Thu Jun 10 10:58:53 2021 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Thu Jun 10 10:58:53 2021 +0000 |
tree | 69e8f89b4ec4ee3603aeb297ebe034319f5ffd5d | |
parent | 5293c0e96504bac8a2753c88fc04bc45aecbafab [diff] | |
parent | cf16aa91572c064334a92981f6c593e48f89c9f4 [diff] |
Merge "Make test_framework-sdkextensions a separate jar with test classes." into sc-dev am: cf16aa9157 Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/SdkExtensions/+/14881594 Change-Id: Id1a60f73ba5f451100029b46f496b31eb8dabea5
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.RollbackManagerServiceImpl#getExtensionVersions
to account for the new extension version.