/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server;
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import android.content.Context;
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import android.content.pm.PackageManager;
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import android.gsi.GsiInstallParams;
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import android.gsi.GsiProgress;
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import android.gsi.IGsiService;
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import android.os.Environment;
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import android.os.IBinder;
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import android.os.IBinder.DeathRecipient;
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import android.os.RemoteException;
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import android.os.ServiceManager;
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import android.os.SystemProperties;
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import android.os.UserHandle;
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import android.os.image.IDynamicSystemService;
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import android.os.storage.StorageManager;
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import android.os.storage.StorageVolume;
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import android.util.Slog;
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import java.io.File;
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/**
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* DynamicSystemService implements IDynamicSystemService. It provides permission check before
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* passing requests to gsid
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*/
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public class DynamicSystemService extends IDynamicSystemService.Stub implements DeathRecipient {
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private static final String TAG = "DynamicSystemService";
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private static final String NO_SERVICE_ERROR = "no gsiservice";
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private static final int GSID_ROUGH_TIMEOUT_MS = 8192;
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private static final String PATH_DEFAULT = "/data/gsi";
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private Context mContext;
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private volatile IGsiService mGsiService;
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DynamicSystemService(Context context) {
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mContext = context;
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}
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private static IGsiService connect(DeathRecipient recipient) throws RemoteException {
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IBinder binder = ServiceManager.getService("gsiservice");
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if (binder == null) {
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return null;
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}
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/**
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* The init will restart gsiservice if it crashed and the proxy object will need to be
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* re-initialized in this case.
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*/
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binder.linkToDeath(recipient, 0);
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return IGsiService.Stub.asInterface(binder);
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}
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/** implements DeathRecipient */
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@Override
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public void binderDied() {
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Slog.w(TAG, "gsiservice died; reconnecting");
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synchronized (this) {
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mGsiService = null;
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}
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}
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private IGsiService getGsiService() throws RemoteException {
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checkPermission();
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if (!"running".equals(SystemProperties.get("init.svc.gsid"))) {
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SystemProperties.set("ctl.start", "gsid");
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}
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for (int sleepMs = 64; sleepMs <= (GSID_ROUGH_TIMEOUT_MS << 1); sleepMs <<= 1) {
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synchronized (this) {
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if (mGsiService == null) {
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mGsiService = connect(this);
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}
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if (mGsiService != null) {
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return mGsiService;
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}
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}
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try {
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Slog.d(TAG, "GsiService is not ready, wait for " + sleepMs + "ms");
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Thread.sleep(sleepMs);
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} catch (InterruptedException e) {
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Slog.e(TAG, "Interrupted when waiting for GSID");
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return null;
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}
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}
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throw new RemoteException(NO_SERVICE_ERROR);
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}
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private void checkPermission() {
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if (mContext.checkCallingOrSelfPermission(
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android.Manifest.permission.MANAGE_DYNAMIC_SYSTEM)
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!= PackageManager.PERMISSION_GRANTED) {
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throw new SecurityException("Requires MANAGE_DYNAMIC_SYSTEM permission");
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}
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}
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@Override
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public boolean startInstallation(long systemSize, long userdataSize) throws RemoteException {
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// priority from high to low: sysprop -> sdcard -> /data
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String path = SystemProperties.get("os.aot.path");
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if (path.isEmpty()) {
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final int userId = UserHandle.myUserId();
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final StorageVolume[] volumes =
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StorageManager.getVolumeList(userId, StorageManager.FLAG_FOR_WRITE);
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for (StorageVolume volume : volumes) {
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if (volume.isEmulated()) continue;
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if (!volume.isRemovable()) continue;
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if (!Environment.MEDIA_MOUNTED.equals(volume.getState())) continue;
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File sdCard = volume.getPathFile();
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if (sdCard.isDirectory()) {
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/**
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* If sdcard is visible, it's path starts with "/storage/" and internal path
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* starts with "/mnt/media_rw". gsi service only take path that start with
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* "/mnt/media_rw" as external storage path, so we use the internal path here.
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*/
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path = volume.getInternalPath();
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break;
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}
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}
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if (path.isEmpty()) {
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path = PATH_DEFAULT;
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}
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Slog.i(TAG, "startInstallation -> " + path);
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}
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GsiInstallParams installParams = new GsiInstallParams();
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installParams.installDir = path;
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installParams.gsiSize = systemSize;
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installParams.userdataSize = userdataSize;
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return getGsiService().beginGsiInstall(installParams) == 0;
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}
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@Override
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public GsiProgress getInstallationProgress() throws RemoteException {
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return getGsiService().getInstallProgress();
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}
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@Override
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public boolean abort() throws RemoteException {
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return getGsiService().cancelGsiInstall();
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}
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@Override
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public boolean isInUse() throws RemoteException {
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boolean gsidWasRunning = "running".equals(SystemProperties.get("init.svc.gsid"));
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boolean isInUse = false;
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try {
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isInUse = getGsiService().isGsiRunning();
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} finally {
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if (!gsidWasRunning && !isInUse) {
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SystemProperties.set("ctl.stop", "gsid");
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}
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}
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return isInUse;
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}
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@Override
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public boolean isInstalled() throws RemoteException {
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return getGsiService().isGsiInstalled();
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}
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@Override
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public boolean isEnabled() throws RemoteException {
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return getGsiService().isGsiEnabled();
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}
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@Override
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public boolean remove() throws RemoteException {
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return getGsiService().removeGsiInstall();
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}
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@Override
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public boolean setEnable(boolean enable) throws RemoteException {
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IGsiService gsiService = getGsiService();
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if (enable) {
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final int status = gsiService.getGsiBootStatus();
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final boolean singleBoot = (status == IGsiService.BOOT_STATUS_SINGLE_BOOT);
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return gsiService.setGsiBootable(singleBoot) == 0;
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} else {
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return gsiService.disableGsiInstall();
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}
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}
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@Override
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public boolean write(byte[] buf) throws RemoteException {
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return getGsiService().commitGsiChunkFromMemory(buf);
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}
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@Override
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public boolean commit() throws RemoteException {
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return getGsiService().setGsiBootable(true) == 0;
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}
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}
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