commit | 8cb4c893e55c6f5327300c57f705ece1a717444e | [log] [tgz] |
---|---|---|
author | Anton Hansson <hansson@google.com> | Tue Mar 15 14:46:39 2022 +0000 |
committer | MÃ¥rten Kongstad <amhk@google.com> | Mon Mar 21 17:29:57 2022 +0000 |
tree | 9089dbb917ed7a23e3e85adfc453be0a7b4b86eb | |
parent | 486bf22c09311e50d1b136e58b97bc6e7820e503 [diff] |
Introduce version code constant for use in test The current test implementation hard-codes the current SDK extension version code in multiple places. Every time the version is bumped, all those places need to be updated. Introduce a new constant (CurrentVersion.V) and use it instead of the hard-coded values. Bug: N/A Test: atest derive_sdk_test SdkExtensionsTest Merged-In: I6b5d899a1fd2a1a364aa3d6794e4096570e94923 Change-Id: I6b5d899a1fd2a1a364aa3d6794e4096570e94923
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.