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/*
* Copyright (C) 2024 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.art.prereboot;
import static com.android.server.art.IDexoptChrootSetup.CHROOT_DIR;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.content.Context;
import android.os.ArtModuleServiceManager;
import android.os.Build;
import android.os.CancellationSignal;
import android.os.RemoteException;
import android.os.ServiceSpecificException;
import android.util.Log;
import android.util.Slog;
import androidx.annotation.RequiresApi;
import com.android.internal.annotations.VisibleForTesting;
import com.android.server.art.ArtManagerLocal;
import com.android.server.art.ArtModuleServiceInitializer;
import com.android.server.art.GlobalInjector;
import com.android.server.art.IDexoptChrootSetup;
import com.android.server.art.Utils;
import dalvik.system.DelegateLastClassLoader;
/**
* Drives Pre-reboot Dexopt, through reflection.
*
* During Pre-reboot Dexopt, the old version of this code is run.
*
* @hide
*/
@RequiresApi(Build.VERSION_CODES.VANILLA_ICE_CREAM)
public class PreRebootDriver {
private static final String TAG = ArtManagerLocal.TAG;
@NonNull private final Injector mInjector;
public PreRebootDriver(@NonNull Context context) {
this(new Injector(context));
}
@VisibleForTesting
public PreRebootDriver(@NonNull Injector injector) {
mInjector = injector;
}
/**
* Runs Pre-reboot Dexopt and returns whether it is successful.
*
* @param otaSlot The slot that contains the OTA update, "_a" or "_b", or null for a Mainline
* update.
*/
public boolean run(@Nullable String otaSlot, @NonNull CancellationSignal cancellationSignal) {
try {
setUp(otaSlot);
runFromChroot(cancellationSignal);
return true;
} catch (RemoteException e) {
Utils.logArtdException(e);
} catch (ServiceSpecificException e) {
Log.e(TAG, "Failed to set up chroot", e);
} catch (ReflectiveOperationException e) {
Log.e(TAG, "Failed to run pre-reboot dexopt", e);
} finally {
tearDown();
}
return false;
}
private void setUp(@Nullable String otaSlot) throws RemoteException {
mInjector.getDexoptChrootSetup().setUp(otaSlot);
}
private void tearDown() {
// In general, the teardown unmounts apexes and partitions, and open files can keep the
// mounts busy so that they cannot be unmounted. Therefore, two things can prevent the
// teardown from succeeding: a running Pre-reboot artd process and the new `service-art.jar`
// opened and mapped by system server. They are managed by the service manager and the
// runtime respectively. There aren't reliable APIs to kill the former or close the latter,
// so we have to do them by triggering GC and finalization, with sleep and retry mechanism.
for (int numRetries = 3; numRetries > 0;) {
try {
Runtime.getRuntime().gc();
Runtime.getRuntime().runFinalization();
// Wait for the service manager to shut down artd. The shutdown is asynchronous.
Utils.sleep(5000);
mInjector.getDexoptChrootSetup().tearDown();
return;
} catch (RemoteException e) {
Utils.logArtdException(e);
} catch (ServiceSpecificException e) {
Log.e(TAG, "Failed to tear down chroot", e);
} catch (IllegalStateException e) {
// Not expected, but we still want retries in such an extreme case.
Slog.wtf(TAG, "Unexpected exception", e);
}
if (--numRetries > 0) {
Log.i(TAG, "Retrying....");
Utils.sleep(30000);
}
}
}
private void runFromChroot(@NonNull CancellationSignal cancellationSignal)
throws ReflectiveOperationException {
String chrootArtDir = CHROOT_DIR + "/apex/com.android.art";
String dexPath = chrootArtDir + "/javalib/service-art.jar";
var classLoader =
new DelegateLastClassLoader(dexPath, this.getClass().getClassLoader() /* parent */);
Class<?> preRebootManagerClass =
classLoader.loadClass("com.android.server.art.prereboot.PreRebootManager");
// Check if the dex file is loaded successfully. Note that the constructor of
// `DelegateLastClassLoader` does not throw when the load fails.
if (preRebootManagerClass == PreRebootManager.class) {
throw new IllegalStateException(String.format("Failed to load %s", dexPath));
}
Object preRebootManager = preRebootManagerClass.getConstructor().newInstance();
preRebootManagerClass
.getMethod("run", ArtModuleServiceManager.class, Context.class,
CancellationSignal.class)
.invoke(preRebootManager, ArtModuleServiceInitializer.getArtModuleServiceManager(),
mInjector.getContext(), cancellationSignal);
}
/**
* Injector pattern for testing purpose.
*
* @hide
*/
@VisibleForTesting
public static class Injector {
@NonNull private final Context mContext;
Injector(@NonNull Context context) {
mContext = context;
}
@NonNull
public Context getContext() {
return mContext;
}
@NonNull
public IDexoptChrootSetup getDexoptChrootSetup() {
return GlobalInjector.getInstance().getDexoptChrootSetup();
}
}
}
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