commit | 006b5e82fefcd0c804f3b234bfc04493f951c081 | [log] [tgz] |
---|---|---|
author | Issei Suzuki <issei@google.com> | Mon May 03 08:29:49 2021 +0000 |
committer | Issei Suzuki <issei@google.com> | Mon May 03 08:29:49 2021 +0000 |
tree | 45b0ee4d421aa5361d4acbf6db1b0c342dae0bc8 | |
parent | b1ffe651c4e1c07ebab46abc4ebc0488cf32d423 [diff] |
Revert "Change extension array to map of all extensions" Revert submission 1687967 Reason for revert: build breakage in mainline-prod Reverted Changes: I11fb44487:Change extension array to map of all extensions Ibdb2f1ba9:Change ALL_EXTENSIONS depending on API level Bug: 187000572 Change-Id: Ic845728277cef195902e7f4f476e5b580c745bc8
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.binarypb
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.