| commit | d03b7b48c6f95befd4b8657d0bddbbe8746e8c08 | [log] [tgz] |
|---|---|---|
| author | Alexei Nicoara <ancr@google.com> | Tue Jul 05 17:51:35 2022 +0100 |
| committer | Alexei Nicoara <ancr@google.com> | Tue Jul 05 17:51:35 2022 +0100 |
| tree | cd67f70adc5b267970ec05a045e1cadaa057dbcc | |
| parent | 2727a413d3ac43510593acd1f6b474a87fe6e056 [diff] |
Setting apex version to the placeholder value When the apex version is set to 0, the version number will be replaced by the build system to the default value for the current branch. The default value for mainline module manifest version is stored in the defaultManifestVersion constant: https://android.googlesource.com/platform/build/soong/+/refs/heads/master/apex/constants.go#36 The version should not be changed manually in the manifest. Release tooling will set this version to the release version on the release branches. Test: presubmit Bug: 231691643 Change-Id: I30b5b486bca521ebdeed17dba7afc61f2c529ab8 Merged-In: I30b5b486bca521ebdeed17dba7afc61f2c529ab8
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.