| commit | 765d8ec035b1ff0e837cdd54e40edc01d4d12f55 | [log] [tgz] |
|---|---|---|
| author | Dennis Shen <dzshen@google.com> | Thu Aug 11 17:42:21 2022 +0000 |
| committer | Dennis Shen <dzshen@google.com> | Fri Aug 12 13:48:42 2022 +0000 |
| tree | d3f547e4a86665d1cfc14a4caebc65db67b0ffa8 | |
| parent | 2c5826d71fc256115c3af96b94ad6985c4f87613 [diff] |
Set version code to 330400000 Go modules ship with phone system image are directly built from source. Thus their version code must be lower than the version code in go train so that go train modules can be properly installed. Ignore-AOSP-First: changes are needed for tm-qpr-dev only for go wembley build. BUG: 234812103 Change-Id: I12eac24e2fb2e4aed132d364810167b3c22fc007 Merged-In: I7ab0829306fc346fd7a558dc69da2560a569524f
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.