commit | 1e271e53088d2277d77e3f3475be99aa7dcf3337 | [log] [tgz] |
---|---|---|
author | Issei Suzuki <issei@google.com> | Mon May 03 11:21:27 2021 +0000 |
committer | Gerrit Code Review <noreply-gerritcodereview@google.com> | Mon May 03 11:21:27 2021 +0000 |
tree | b522f849eb6ca8db88ccd0328177df4180b93f19 | |
parent | 8eed4db749589c9c248e5df3aff4ffd49b73e4cf [diff] | |
parent | b5454aa2e549be5e6827c13c0afdd99e9daa4f4f [diff] |
Merge changes from topic "revert-1687967-LRBSSNZZOT" * changes: Revert "Change ALL_EXTENSIONS depending on API level" Revert "Change extension array to map of all extensions"
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.