commit | 58d7d8852a134352ac17ae23aeb692b255955f08 | [log] [tgz] |
---|---|---|
author | Anton Hansson <hansson@google.com> | Tue Apr 19 17:19:23 2022 +0100 |
committer | Anton Hansson <hansson@google.com> | Tue Apr 19 17:23:31 2022 +0100 |
tree | 9c9eeab9ec64cb145670812037f6608627192f9c | |
parent | 5fd5ea7f10ef9956726a73ff2e7333c499f35cf6 [diff] |
Add driver script for gen_sdk and test updates This bash script wraps building gen_sdk, running gen_sdk, and updating test assertions. Bug: 222050148 Bug: 228451704 Test: packages/modules/SdkExtensions/gen_sdk/bump_sdk.sh 3 12 Change-Id: Ib346dd340b275b888efd83ecdf24e8c0f45e6753
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.
An extension is a way to group a set of modules so that they are versioned together. We currently define a new extension for every Android SDK level that introduces new modules. Every module shipped in previous versions are also part of the new extension. For example, all the R modules are part of both the R extensions and the S extensions.
The steps to define a new extension are:
derive_sdk.cpp
by:GetSdkLevel
with the new enum setderive_sdk_test.cpp
verifying the new extensions workSdkExtensions.getExtensionVersion
API support the new extensions.