commit | bb44bdc0f22106c6bf0152cd98c59bfb1988b5f1 | [log] [tgz] |
---|---|---|
author | Artur Satayev <satayev@google.com> | Mon Mar 01 23:47:10 2021 +0000 |
committer | Artur Satayev <satayev@google.com> | Tue Mar 16 08:51:00 2021 +0000 |
tree | 7745f780e2e2dec88d945f20285dd00050126abe | |
parent | 3207cc6d0941bbf6dcb11c6d1c4bf5c10dc8985e [diff] |
Introduce derive_classpath service. Initial version simply copies existing /etc/classpath to /data/system/environ/classpath for init to export. The topic also sets appropriate sepolicy rules for the service. See go/updatable-classpath for more details. Bug: 180105615 Test: manual + boot test Change-Id: I6e3c64e7a68ae8803f77c30f0698551fd79a350b
SdkExtensions is a module that decides the extension SDK level of the device, and provides APIs for applications to query the extension SDK level.
The module is packaged in an apex, com.android.sdkext
, and has two components:
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)
.
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.