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一、简介
PackageManagerService#xff08;简称 PMS#xff09;#xff0c;是 Android 系统核心服务之一#xff0c;处理包管理相关的工作#xff0c;常见的比如安装、卸载应用等。本章针对SyetemServer、PMS构造方法重点模…源码参考Search (aospxref.com)
一、简介
PackageManagerService简称 PMS是 Android 系统核心服务之一处理包管理相关的工作常见的比如安装、卸载应用等。本章针对SyetemServer、PMS构造方法重点模块解析
二、SystemServer.java
PMS是在SystemServer中启动所有我们从SystemServer为入口进行解析
frameworks/base/services/java/com/android/server/SystemServer.java
2.1 main public static void main(String[] args) {new SystemServer().run();}
2.2 run private void run() {...//SYSTEM_SERVER_STARTEventLog.writeEvent(EventLogTags.SYSTEM_SERVER_START,mStartCount, mRuntimeStartUptime, mRuntimeStartElapsedTime);// Start services.try {t.traceBegin(StartServices);//启动引导服务【见1.3】startBootstrapServices(t);//启动核心服务startCoreServices(t);//启动其他服务startOtherServices(t);startApexServices(t);// Only update the timeout after starting all the services so that we use// the default timeout to start system server.updateWatchdogTimeout(t);} catch (Throwable ex) {Slog.e(System, ******************************************);Slog.e(System, ************ Failure starting system services, ex);throw ex;} finally {t.traceEnd(); // StartServices}...
}
2.3 startBootstrapServices
private void startBootstrapServices() {…//启动installer服务负责package安装、删除、迁移、更新的系统服务t.traceBegin(StartInstaller);Installer installer mSystemServiceManager.startService(Installer.class);t.traceEnd();…//启动PMS服务t.traceBegin(StartPackageManagerService);try {Watchdog.getInstance().pauseWatchingCurrentThread(packagemanagermain);mPackageManagerService PackageManagerService.main(mSystemContext, installer, domainVerificationService,mFactoryTestMode ! FactoryTest.FACTORY_TEST_OFF);} finally {Watchdog.getInstance().resumeWatchingCurrentThread(packagemanagermain);}//mFirstBoot是后续WMS创建时所需要的参数系统服务之间是有依赖关系的它们的启动顺序不能随意被更改。mFirstBoot mPackageManagerService.isFirstBoot();mPackageManager mSystemContext.getPackageManager();t.traceEnd();...
}
private void startOtherServices() {
...t.traceBegin(MakePackageManagerServiceReady);mPackageManagerService.systemReady();t.traceEnd();
…
}
三、PackageManagerService.Java
3.1 main
main方法主要做了两件事一个是创建PMS对象另一个是将PMS注册到ServiceManager中。 public static PackageManagerService main(Context context,Installer installer, NonNull DomainVerificationService domainVerificationService,boolean factoryTest) {// Self-check for initial settings.//自检初始设置PackageManagerServiceCompilerMapping.checkProperties();final TimingsTraceAndSlog t new TimingsTraceAndSlog(TAG Timing,Trace.TRACE_TAG_PACKAGE_MANAGER);t.traceBegin(create package manager);final PackageManagerTracedLock lock new PackageManagerTracedLock();final Object installLock new Object();HandlerThread backgroundThread new ServiceThread(PackageManagerBg,Process.THREAD_PRIORITY_BACKGROUND, true /*allowIo*/);backgroundThread.start();Handler backgroundHandler new Handler(backgroundThread.getLooper(),BACKGROUND_HANDLER_CALLBACK);//injector里面会初始化Settings、PackageDexOptimizer、DexManager等后面需要用到PackageManagerServiceInjector injector new PackageManagerServiceInjector(context, lock, installer, installLock, new PackageAbiHelperImpl(),backgroundHandler,SYSTEM_PARTITIONS,(i, pm) - new ComponentResolver(i.getUserManagerService(), pm.mUserNeedsBadging),(i, pm) - PermissionManagerService.create(context,i.getSystemConfig().getAvailableFeatures()),(i, pm) - new UserManagerService(context, pm,new UserDataPreparer(installer, installLock, context), lock),//Settings用于保存所有包的动态设置(i, pm) - new Settings(Environment.getDataDirectory(),RuntimePermissionsPersistence.createInstance(),i.getPermissionManagerServiceInternal(),domainVerificationService, backgroundHandler,lock),(i, pm) - AppsFilterImpl.create(i,i.getLocalService(PackageManagerInternal.class)),(i, pm) - (PlatformCompat) ServiceManager.getService(platform_compat),//得到全局系统配置信息。(i, pm) - SystemConfig.getInstance(),//创建Dex优化工具类(i, pm) - new PackageDexOptimizer(i.getInstaller(), i.getInstallLock(),i.getContext(), *dexopt*),(i, pm) - new DexManager(i.getContext(), i.getPackageDexOptimizer(),i.getInstaller(), i.getInstallLock(), i.getDynamicCodeLogger()),(i, pm) - new DynamicCodeLogger(i.getInstaller()),(i, pm) - new ArtManagerService(i.getContext(), i.getInstaller(),i.getInstallLock()),(i, pm) - ApexManager.getInstance(),(i, pm) - new ViewCompiler(i.getInstallLock(), i.getInstaller()),(i, pm) - (IncrementalManager)i.getContext().getSystemService(Context.INCREMENTAL_SERVICE),(i, pm) - new DefaultAppProvider(() - context.getSystemService(RoleManager.class),() - LocalServices.getService(UserManagerInternal.class)),//用于存储屏幕的相关信息(i, pm) - new DisplayMetrics(),(i, pm) - new PackageParser2(pm.mSeparateProcesses, i.getDisplayMetrics(),pm.mCacheDir,pm.mPackageParserCallback) /* scanningCachingPackageParserProducer */,(i, pm) - new PackageParser2(pm.mSeparateProcesses, i.getDisplayMetrics(), null,pm.mPackageParserCallback) /* scanningPackageParserProducer */,(i, pm) - new PackageParser2(pm.mSeparateProcesses, i.getDisplayMetrics(), null,pm.mPackageParserCallback) /* preparingPackageParserProducer */,// Prepare a supplier of package parser for the staging manager to parse apex file
....if (Build.VERSION.SDK_INT 0) {Slog.w(TAG, **** ro.build.version.sdk not set!);}//初始化PMS[见3.1]PackageManagerService m new PackageManagerService(injector, factoryTest,PackagePartitions.FINGERPRINT, Build.IS_ENG, Build.IS_USERDEBUG,Build.VERSION.SDK_INT, Build.VERSION.INCREMENTAL);t.traceEnd(); // create package manager.....injector.getCompatibility().registerListener(SELinuxMMAC.SELINUX_LATEST_CHANGES,selinuxChangeListener);injector.getCompatibility().registerListener(SELinuxMMAC.SELINUX_R_CHANGES,selinuxChangeListener);m.installAllowlistedSystemPackages();IPackageManagerImpl iPackageManager m.new IPackageManagerImpl();//向ServiceManager注册服务ServiceManager.addService(package, iPackageManager);final PackageManagerNative pmn new PackageManagerNative(m);ServiceManager.addService(package_native, pmn);return m;}
3.2 PackageManagerService()
PMS的构造方法这部分代码非常多主要分5个阶段
PMS_START阶段
构造Settings类这个是Android的全局管理者用于协助PMS保存所有的安装包信息;保存Installer对象初始化SystemConfig获取系统配置信息包括全局属性、groupid以及系统权限。初始化一些功能类包括PackageDexOptimizer dex优化工具类 、 DexManagerdex管理类、PackageHandler建立package相关操作的消息循环等创建data下的各种目录比如data/app, data/app-private等。
PMS_SYSTEM_SCAN_START阶段
通过scanDirTracedLI扫描系统目录文件包括/system/framework 、/system/priv-app 、/system/app 这俩都是放系统app、/vendor/overlay、/vendor/app、oem/app。
PMS_DATA_SCAN_START阶段
通过scanDirTracedLI扫描/data/app和/data/app-private目录下的文件。
PMS_SCAN_END阶段
将上述信息写回/data/system/packages.xml。
PMS_READY阶段
创建服务PackageInstallerService。
3.2.1 BOOT_PROGRESS_PMS_START public PackageManagerService(PackageManagerServiceInjector injector, boolean factoryTest,final String partitionsFingerprint, final boolean isEngBuild,final boolean isUserDebugBuild, final int sdkVersion, final String incrementalVersion) {// 存储构建和版本信息mIsEngBuild isEngBuild; // 是否为工程版构建mIsUserDebugBuild isUserDebugBuild; // 是否为用户调试版本mSdkVersion sdkVersion; // 系统的 SDK 版本mIncrementalVersion incrementalVersion; // 增量构建版本// 通过 injector 注入依赖mInjector injector;mInjector.getSystemWrapper().disablePackageCaches();final TimingsTraceAndSlog t new TimingsTraceAndSlog(TAG Timing,Trace.TRACE_TAG_PACKAGE_MANAGER);mPendingBroadcasts new PendingPackageBroadcasts();// 启动 injector 的引导程序mInjector.bootstrap(this);mLock injector.getLock();mPackageStateWriteLock mLock;mInstallLock injector.getInstallLock();LockGuard.installLock(mLock, LockGuard.INDEX_PACKAGES);//第一阶段 BOOT_PROGRESS_PMS_STARTEventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_START,SystemClock.uptimeMillis());// 初始化上下文和其他服务mContext injector.getContext();mFactoryTest factoryTest;//用于存储屏幕的相关信息mMetrics injector.getDisplayMetrics();//Installer对象mInstaller injector.getInstaller();mEnableFreeCacheV2 SystemProperties.getBoolean(fw.free_cache_v2, true);// Create sub-components that provide services / data. Order here is important.t.traceBegin(createSubComponents);// Expose private service for system components to use.LocalServices.addService(PackageManagerInternal.class, new PackageManagerInternalImpl());LocalManagerRegistry.addManager(PackageManagerLocal.class,new PackageManagerLocalImpl(this));LocalServices.addService(TestUtilityService.class, this);mTestUtilityService LocalServices.getService(TestUtilityService.class);// 初始化用户管理和组件解析器mUserManager injector.getUserManagerService();mUserNeedsBadging new UserNeedsBadgingCache(mUserManager);mComponentResolver injector.getComponentResolver();mPermissionManager injector.getPermissionManagerServiceInternal();//Android的全局管理者用于协助PMS保存所有的安装包信息;[见3.3]mSettings injector.getSettings();mIncrementalManager mInjector.getIncrementalManager();mDefaultAppProvider mInjector.getDefaultAppProvider();mLegacyPermissionManager mInjector.getLegacyPermissionManagerInternal();PlatformCompat platformCompat mInjector.getCompatibility();mPackageParserCallback new PackageParser2.Callback() {Overridepublic boolean isChangeEnabled(long changeId, NonNull ApplicationInfo appInfo) {return platformCompat.isChangeEnabled(changeId, appInfo);}Overridepublic boolean hasFeature(String feature) {return PackageManagerService.this.hasSystemFeature(feature, 0);}};// CHECKSTYLE:ON IndentationCheckt.traceEnd();// 添加共享用户如两个App的之间的数据是不共享的如果它们有了共同的sharedUserId就可以运行在同一个进程中共享数据。t.traceBegin(addSharedUsers);mSettings.addSharedUserLPw(android.uid.system, Process.SYSTEM_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.phone, RADIO_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.log, LOG_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.nfc, NFC_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.bluetooth, BLUETOOTH_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.shell, SHELL_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.se, SE_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.networkstack, NETWORKSTACK_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.uwb, UWB_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);t.traceEnd();// 获取分离进程的系统属性String separateProcesses SystemProperties.get(debug.separate_processes);if (separateProcesses ! null separateProcesses.length() 0) {if (*.equals(separateProcesses)) {mDefParseFlags ParsingPackageUtils.PARSE_IGNORE_PROCESSES;mSeparateProcesses null;Slog.w(TAG, Running with debug.separate_processes: * (ALL));} else {mDefParseFlags 0;mSeparateProcesses separateProcesses.split(,);Slog.w(TAG, Running with debug.separate_processes: separateProcesses);}} else {mDefParseFlags 0;mSeparateProcesses null;}// 初始化 Dex 优化器和管理器mPackageDexOptimizer injector.getPackageDexOptimizer();//Dex优化工具类mDexManager injector.getDexManager();mDynamicCodeLogger injector.getDynamicCodeLogger();//后台DexOpt服务mBackgroundDexOptService injector.getBackgroundDexOptService();mArtManagerService injector.getArtManagerService();mMoveCallbacks new MovePackageHelper.MoveCallbacks(FgThread.get().getLooper());mViewCompiler injector.getViewCompiler();mSharedLibraries mInjector.getSharedLibrariesImpl();mBackgroundHandler injector.getBackgroundHandler();mContext.getSystemService(DisplayManager.class).getDisplay(Display.DEFAULT_DISPLAY).getMetrics(mMetrics);t.traceBegin(get system config);SystemConfig systemConfig injector.getSystemConfig();mAvailableFeatures systemConfig.getAvailableFeatures();t.traceEnd();mProtectedPackages new ProtectedPackages(mContext);// 初始化 APEX 和应用过滤器mApexManager injector.getApexManager();mAppsFilter mInjector.getAppsFilter();mInstantAppRegistry new InstantAppRegistry(mContext, mPermissionManager,mInjector.getUserManagerInternal(), new DeletePackageHelper(this));mChangedPackagesTracker new ChangedPackagesTracker();// 应用安装目录mAppInstallDir new File(Environment.getDataDirectory(), app);mDomainVerificationConnection new DomainVerificationConnection(this);mDomainVerificationManager injector.getDomainVerificationManagerInternal();mDomainVerificationManager.setConnection(mDomainVerificationConnection);// 初始化各类HelpermBroadcastHelper new BroadcastHelper(mInjector);mAppDataHelper new AppDataHelper(this);mInstallPackageHelper new InstallPackageHelper(this, mAppDataHelper);mRemovePackageHelper new RemovePackageHelper(this, mAppDataHelper);mDeletePackageHelper new DeletePackageHelper(this, mRemovePackageHelper,mAppDataHelper);mSharedLibraries.setDeletePackageHelper(mDeletePackageHelper);mPreferredActivityHelper new PreferredActivityHelper(this);mResolveIntentHelper new ResolveIntentHelper(mContext, mPreferredActivityHelper,injector.getCompatibility(), mUserManager, mDomainVerificationManager,mUserNeedsBadging, () - mResolveInfo, () - mInstantAppInstallerActivity,injector.getBackgroundHandler());mDexOptHelper new DexOptHelper(this);mSuspendPackageHelper new SuspendPackageHelper(this, mInjector, mUserManager,mBroadcastHelper, mProtectedPackages);mDistractingPackageHelper new DistractingPackageHelper(this, mInjector, mBroadcastHelper,mSuspendPackageHelper);mStorageEventHelper new StorageEventHelper(this, mDeletePackageHelper,mRemovePackageHelper);synchronized (mLock) {// Create the computer as soon as the state objects have been installed. The// cached computer is the same as the live computer until the end of the// constructor, at which time the invalidation method updates it.mSnapshotStatistics new SnapshotStatistics();// 初始化快照统计数据sSnapshotPendingVersion.incrementAndGet();mLiveComputer createLiveComputer();registerObservers(true);// 注册观察者监听系统状态的变化}Computer computer mLiveComputer;// CHECKSTYLE:OFF IndentationChecksynchronized (mInstallLock) {// writer// 这里是包管理器服务的核心锁机制用于在包安装过程中确保线程安全。synchronized (mLock) {mHandler injector.getHandler();mProcessLoggingHandler new ProcessLoggingHandler();//将PackageHandler添加到Watchdog的检测集中Watchdog.getInstance().addThread(mHandler, WATCHDOG_TIMEOUT);// 加载共享库的配置ArrayMapString, SystemConfig.SharedLibraryEntry libConfig systemConfig.getSharedLibraries();final int builtInLibCount libConfig.size();for (int i 0; i builtInLibCount; i) {mSharedLibraries.addBuiltInSharedLibraryLPw(libConfig.valueAt(i));}// Now that we have added all the libraries, iterate again to add dependency// information IFF their dependencies are added.// 添加共享库的依赖项long undefinedVersion SharedLibraryInfo.VERSION_UNDEFINED;for (int i 0; i builtInLibCount; i) {String name libConfig.keyAt(i);SystemConfig.SharedLibraryEntry entry libConfig.valueAt(i);final int dependencyCount entry.dependencies.length;for (int j 0; j dependencyCount; j) {final SharedLibraryInfo dependency computer.getSharedLibraryInfo(entry.dependencies[j], undefinedVersion);if (dependency ! null) {computer.getSharedLibraryInfo(name, undefinedVersion).addDependency(dependency);}}}// 读取 SELinux 安装策略SELinuxMMAC.readInstallPolicy();t.traceBegin(loadFallbacks);FallbackCategoryProvider.loadFallbacks();t.traceEnd();// 读取用户设置检查系统是否是首次启动t.traceBegin(read user settings);mFirstBoot !mSettings.readLPw(computer,mInjector.getUserManagerInternal().getUsers(/* excludePartial */ true,/* excludeDying */ false,/* excludePreCreated */ false));t.traceEnd();// 如果是第一次启动设置安装程序的第一次启动标志if (mFirstBoot) {t.traceBegin(setFirstBoot: );try {mInstaller.setFirstBoot();} catch (InstallerException e) {Slog.w(TAG, Could not set First Boot: , e);}t.traceEnd();}mPermissionManager.readLegacyPermissionsTEMP(mSettings.mPermissions);mPermissionManager.readLegacyPermissionStateTEMP();if (mFirstBoot) {DexOptHelper.requestCopyPreoptedFiles();}String customResolverActivityName Resources.getSystem().getString(R.string.config_customResolverActivity);if (!TextUtils.isEmpty(customResolverActivityName)) {mCustomResolverComponentName ComponentName.unflattenFromString(customResolverActivityName);}long startTime SystemClock.uptimeMillis();
3.2.2 BOOT_PROGRESS_PMS_SYSTEM_SCAN_START
/system可以称作为System分区里面主要存储谷歌和其他厂商提供的Android系统相关文件和框架。Android系统架构分为应用层、应用框架层、系统运行库层Native 层、硬件抽象层HAL层和Linux内核层除了Linux内核层在Boot分区其他层的代码都在System分区。
该阶段主要在扫描各目录下的apps耗时开机耗时需重点关注。 EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_SYSTEM_SCAN_START,startTime);final String bootClassPath System.getenv(BOOTCLASSPATH);final String systemServerClassPath System.getenv(SYSTEMSERVERCLASSPATH);if (bootClassPath null) {Slog.w(TAG, No BOOTCLASSPATH found!);}if (systemServerClassPath null) {Slog.w(TAG, No SYSTEMSERVERCLASSPATH found!);}final VersionInfo ver mSettings.getInternalVersion();mIsUpgrade !partitionsFingerprint.equals(ver.fingerprint);if (mIsUpgrade) {PackageManagerServiceUtils.logCriticalInfo(Log.INFO,Upgrading from ver.fingerprint ( ver.buildFingerprint ) to PackagePartitions.FINGERPRINT ( Build.FINGERPRINT ));}mInitAppsHelper new InitAppsHelper(this, mApexManager, mInstallPackageHelper,mInjector.getSystemPartitions());// when upgrading from pre-M, promote system app permissions from install to runtimemPromoteSystemApps mIsUpgrade ver.sdkVersion Build.VERSION_CODES.LOLLIPOP_MR1;mIsPreNMR1Upgrade mIsUpgrade ver.sdkVersion Build.VERSION_CODES.N_MR1;mIsPreQUpgrade mIsUpgrade ver.sdkVersion Build.VERSION_CODES.Q;final WatchedArrayMapString, PackageSetting packageSettings mSettings.getPackagesLocked();if (isDeviceUpgrading()) {// Save the names of pre-existing packages prior to scanning, so we can determine// which system packages are completely new due to an upgrade.mExistingPackages new ArraySet(packageSettings.size());for (PackageSetting ps : packageSettings.values()) {mExistingPackages.add(ps.getPackageName());}// Triggering {link com.android.server.pm.crossprofile.// CrossProfileIntentFilterHelper.updateDefaultCrossProfileIntentFilter} to update// {link CrossProfileIntentFilter}s between eligible users and their parentt.traceBegin(cross profile intent filter update);mInjector.getCrossProfileIntentFilterHelper().updateDefaultCrossProfileIntentFilter();t.traceEnd();}mCacheDir PackageManagerServiceUtils.preparePackageParserCache(mIsEngBuild, mIsUserDebugBuild, mIncrementalVersion);mInitialNonStoppedSystemPackages mInjector.getSystemConfig().getInitialNonStoppedSystemPackages();mShouldStopSystemPackagesByDefault mContext.getResources().getBoolean(R.bool.config_stopSystemPackagesByDefault);final int[] userIds mUserManager.getUserIds();//扫描system目录下的apps[见3.2.2.1]PackageParser2 packageParser mInjector.getScanningCachingPackageParser();mOverlayConfig mInitAppsHelper.initSystemApps(packageParser, packageSettings, userIds,startTime);
3.2.2.1 InitAppsHelper.initSystemApps public OverlayConfig initSystemApps(PackageParser2 packageParser,WatchedArrayMapString, PackageSetting packageSettings,int[] userIds, long startTime) {// Prepare apex package info before scanning APKs, this information is needed when// scanning apk in apex.final ListApexManager.ScanResult apexScanResults scanApexPackagesTraced(packageParser);mApexManager.notifyScanResult(apexScanResults);扫描system各个目录下的apps[见3.2.2.2]scanSystemDirs(packageParser, mExecutorService);// Parse overlay configuration files to set default enable state, mutability, and// priority of system overlays.final ArrayMapString, File apkInApexPreInstalledPaths new ArrayMap();for (ApexManager.ActiveApexInfo apexInfo : mApexManager.getActiveApexInfos()) {for (String packageName : mApexManager.getApksInApex(apexInfo.apexModuleName)) {apkInApexPreInstalledPaths.put(packageName, apexInfo.preInstalledApexPath);}}final OverlayConfig overlayConfig OverlayConfig.initializeSystemInstance(consumer - mPm.forEachPackageState(mPm.snapshotComputer(),packageState - {var pkg packageState.getPkg();if (pkg ! null) {consumer.accept(pkg, packageState.isSystem(),apkInApexPreInstalledPaths.get(pkg.getPackageName()));}}));// do this first before mucking with mPackages for the expecting better caseupdateStubSystemAppsList(mStubSystemApps);mInstallPackageHelper.prepareSystemPackageCleanUp(packageSettings,mPossiblyDeletedUpdatedSystemApps, mExpectingBetter, userIds);[见3.2.2.3]统计扫描多少个应用和耗时logSystemAppsScanningTime(startTime);return overlayConfig;}
3.2.2.2 InitAppsHelper.scanSystemDirs GuardedBy({mPm.mInstallLock, mPm.mLock})private void scanSystemDirs(PackageParser2 packageParser, ExecutorService executorService) {File frameworkDir new File(Environment.getRootDirectory(), framework);// Collect vendor/product/system_ext overlay packages. (Do this before scanning// any apps.)// For security and version matching reason, only consider overlay packages if they// reside in the right directory.for (int i mDirsToScanAsSystem.size() - 1; i 0; i--) {final ScanPartition partition mDirsToScanAsSystem.get(i);if (partition.getOverlayFolder() null) {continue;}//扫描/vendor/overlay目录下的文件scanDirTracedLI(partition.getOverlayFolder(),mSystemParseFlags, mSystemScanFlags | partition.scanFlag,packageParser, executorService, partition.apexInfo);}//扫描/system/framework 目录下的文件scanDirTracedLI(frameworkDir,mSystemParseFlags, mSystemScanFlags | SCAN_NO_DEX | SCAN_AS_PRIVILEGED,packageParser, executorService, null);if (!mPm.mPackages.containsKey(android)) {throw new IllegalStateException(Failed to load frameworks package; check log for warnings);}for (int i 0, size mDirsToScanAsSystem.size(); i size; i) {final ScanPartition partition mDirsToScanAsSystem.get(i);if (partition.getPrivAppFolder() ! null) {//扫描 /system/priv-app 目录下的文件scanDirTracedLI(partition.getPrivAppFolder(),mSystemParseFlags,mSystemScanFlags | SCAN_AS_PRIVILEGED | partition.scanFlag,packageParser, executorService, partition.apexInfo);}scanDirTracedLI(partition.getAppFolder(),mSystemParseFlags, mSystemScanFlags | partition.scanFlag,packageParser, executorService, partition.apexInfo);}}
3.2.2.3 logSystemAppsScanningTime GuardedBy({mPm.mInstallLock, mPm.mLock})private void logSystemAppsScanningTime(long startTime) {mCachedSystemApps PackageCacher.sCachedPackageReadCount.get();// Remove any shared userIDs that have no associated packagesmPm.mSettings.pruneSharedUsersLPw();mSystemScanTime SystemClock.uptimeMillis() - startTime;mSystemPackagesCount mPm.mPackages.size();//统计扫描多少个system目录平均耗时多少可以在even log中查找Slog.i(TAG, Finished scanning system apps. Time: mSystemScanTime ms, packageCount: mSystemPackagesCount , timePerPackage: (mSystemPackagesCount 0 ? 0 : mSystemScanTime / mSystemPackagesCount) , cached: mCachedSystemApps);if (mIsDeviceUpgrading mSystemPackagesCount 0) {//CHECKSTYLE:OFF IndentationCheckFrameworkStatsLog.write(FrameworkStatsLog.BOOT_TIME_EVENT_DURATION_REPORTED,BOOT_TIME_EVENT_DURATION__EVENT__OTA_PACKAGE_MANAGER_SYSTEM_APP_AVG_SCAN_TIME,mSystemScanTime / mSystemPackagesCount);//CHECKSTYLE:ON IndentationCheck}}
3.2.3 BOOT_PROGRESS_PMS_DATA_SCAN_START
data可以称为Data分区它用来存储所有用户的个人数据和配置文件。下面列出Data分区部分子目录
| 目录| 含义| | :——–: | :——–:| :–: | | app| 存储用户自己安装的App| | data| 存储所有已安装的App数据的目录每个App都有自己单独的子目录 | | app-private| App的私有存储空间 | | app-lib|存储所有App的Jni库 | | system| 存放系统配置文件 | | anr| 用于存储ANR发生时系统生成的traces.txt文件 | //该方法为扫描data目录下的apps[见3.2.3.1]mInitAppsHelper.initNonSystemApps(packageParser, userIds, startTime);packageParser.close();mRequiredVerifierPackages getRequiredButNotReallyRequiredVerifiersLPr(computer);mRequiredInstallerPackage getRequiredInstallerLPr(computer);mRequiredUninstallerPackage getRequiredUninstallerLPr(computer);// PermissionController hosts default permission granting and role management, so its a// critical part of the core system.mRequiredPermissionControllerPackage getRequiredPermissionControllerLPr(computer);// Resolve the storage manager.mStorageManagerPackage getStorageManagerPackageName(computer);// Resolve protected action filters. Only the setup wizard is allowed to// have a high priority filter for these actions.mSetupWizardPackage getSetupWizardPackageNameImpl(computer);mComponentResolver.fixProtectedFilterPriorities(mSetupWizardPackage);mDefaultTextClassifierPackage ensureSystemPackageName(computer,mContext.getString(R.string.config_servicesExtensionPackage));mSystemTextClassifierPackageName ensureSystemPackageName(computer,mContext.getString(R.string.config_defaultTextClassifierPackage));mConfiguratorPackage ensureSystemPackageName(computer,mContext.getString(R.string.config_deviceConfiguratorPackageName));mAppPredictionServicePackage ensureSystemPackageName(computer,getPackageFromComponentString(R.string.config_defaultAppPredictionService));mIncidentReportApproverPackage ensureSystemPackageName(computer,mContext.getString(R.string.config_incidentReportApproverPackage));mRetailDemoPackage getRetailDemoPackageName();mOverlayConfigSignaturePackage ensureSystemPackageName(computer,mInjector.getSystemConfig().getOverlayConfigSignaturePackage());mRecentsPackage ensureSystemPackageName(computer,getPackageFromComponentString(R.string.config_recentsComponentName));mAmbientContextDetectionPackage ensureSystemPackageName(computer,getPackageFromComponentString(R.string.config_defaultAmbientContextDetectionService));mWearableSensingPackage ensureSystemPackageName(computer,getPackageFromComponentString(R.string.config_defaultWearableSensingService));// Now that we know all of the shared libraries, update all clients to have// the correct library paths.mSharedLibraries.updateAllSharedLibrariesLPw(null, null, Collections.unmodifiableMap(mPackages));for (SharedUserSetting setting : mSettings.getAllSharedUsersLPw()) {// NOTE: We ignore potential failures here during a system scan (like// the rest of the commands above) because theres precious little we// can do about it. A settings error is reported, though.final ListString changedAbiCodePath ScanPackageUtils.applyAdjustedAbiToSharedUser(setting,null /*scannedPackage*/,mInjector.getAbiHelper().getAdjustedAbiForSharedUser(setting.getPackageStates(), null /*scannedPackage*/));if (!useArtService() // Skip for ART Service since it has its own dex file GC.changedAbiCodePath ! null changedAbiCodePath.size() 0) {for (int i changedAbiCodePath.size() - 1; i 0; --i) {final String codePathString changedAbiCodePath.get(i);try {mInstaller.rmdex(codePathString,getDexCodeInstructionSet(getPreferredInstructionSet()));} catch (LegacyDexoptDisabledException e) {throw new RuntimeException(e);} catch (InstallerException ignored) {}}}// Adjust seInfo to ensure apps which share a sharedUserId are placed in the same// SELinux domain.setting.fixSeInfoLocked();setting.updateProcesses();}// Now that we know all the packages we are keeping,// read and update their last usage times.mPackageUsage.read(packageSettings);mCompilerStats.read();3.2.3.1InitAppsHelper.initNonSystemApps public void initNonSystemApps(PackageParser2 packageParser, NonNull int[] userIds,long startTime) {//扫描data app日志节点BOOT_PROGRESS_PMS_DATA_SCAN_STARTEventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_DATA_SCAN_START,SystemClock.uptimeMillis());if ((mScanFlags SCAN_FIRST_BOOT_OR_UPGRADE) SCAN_FIRST_BOOT_OR_UPGRADE) {fixInstalledAppDirMode();}//扫描/data/app目录下的文件 scanDirTracedLI(mPm.getAppInstallDir(), 0,mScanFlags | SCAN_REQUIRE_KNOWN, packageParser, mExecutorService, null);ListRunnable unfinishedTasks mExecutorService.shutdownNow();if (!unfinishedTasks.isEmpty()) {throw new IllegalStateException(Not all tasks finished before calling close: unfinishedTasks);}fixSystemPackages(userIds);[见3.2.3.2]logNonSystemAppScanningTime(startTime);mExpectingBetter.clear();mPm.mSettings.pruneRenamedPackagesLPw();}
3.2.3.2 InitAppsHelper.logNonSystemAppScanningTime GuardedBy({mPm.mInstallLock, mPm.mLock})private void logNonSystemAppScanningTime(long startTime) {final int cachedNonSystemApps PackageCacher.sCachedPackageReadCount.get()- mCachedSystemApps;final long dataScanTime SystemClock.uptimeMillis() - mSystemScanTime - startTime;final int dataPackagesCount mPm.mPackages.size() - mSystemPackagesCount;//统计总共扫描了多少个non-system apps平均耗时多少可以在even log里查看Slog.i(TAG, Finished scanning non-system apps. Time: dataScanTime ms, packageCount: dataPackagesCount , timePerPackage: (dataPackagesCount 0 ? 0 : dataScanTime / dataPackagesCount) , cached: cachedNonSystemApps);if (mIsDeviceUpgrading dataPackagesCount 0) {//CHECKSTYLE:OFF IndentationCheckFrameworkStatsLog.write(FrameworkStatsLog.BOOT_TIME_EVENT_DURATION_REPORTED,BOOT_TIME_EVENT_DURATION__EVENT__OTA_PACKAGE_MANAGER_DATA_APP_AVG_SCAN_TIME,dataScanTime / dataPackagesCount);//CHECKSTYLE:OFF IndentationCheck}}
3.2.4 BOOT_PROGRESS_PMS_SCAN_END EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_SCAN_END,SystemClock.uptimeMillis());Slog.i(TAG, Time to scan packages: ((SystemClock.uptimeMillis() - startTime) / 1000f) seconds);// If the partitions fingerprint has changed since the last time we booted,// we need to re-grant app permission to catch any new ones that// appear. This is really a hack, and means that apps can in some// cases get permissions that the user didnt initially explicitly// allow... it would be nice to have some better way to handle// this situation.if (mIsUpgrade) {Slog.i(TAG, Partitions fingerprint changed from ver.fingerprint to PackagePartitions.FINGERPRINT ; regranting permissions for internal storage);}mPermissionManager.onStorageVolumeMounted(StorageManager.UUID_PRIVATE_INTERNAL, mIsUpgrade);ver.sdkVersion mSdkVersion;// If this is the first boot or an update from pre-M, then we need to initialize the// default preferred apps across all defined users.//如果是第一次启动或者是Android M升级后的第一次启动需要初始化所有用户定义的默认首选Appif (mPromoteSystemApps || mFirstBoot) {for (UserInfo user : mInjector.getUserManagerInternal().getUsers(true)) {mSettings.applyDefaultPreferredAppsLPw(user.id);}}// If this is first boot after an OTA, then we need to clear code cache directories.// Note that we do *not* clear the application profiles. These remain valid// across OTAs and are used to drive profile verification (post OTA) and// profile compilation (without waiting to collect a fresh set of profiles).//OTA后的第一次启动会清除代码缓存目录。if (mIsUpgrade) {Slog.i(TAG, Build fingerprint changed; clearing code caches);for (int i 0; i packageSettings.size(); i) {final PackageSetting ps packageSettings.valueAt(i);if (Objects.equals(StorageManager.UUID_PRIVATE_INTERNAL, ps.getVolumeUuid())) {// No apps are running this early, so no need to freezemAppDataHelper.clearAppDataLIF(ps.getPkg(), UserHandle.USER_ALL,FLAG_STORAGE_DE | FLAG_STORAGE_CE | FLAG_STORAGE_EXTERNAL| Installer.FLAG_CLEAR_CODE_CACHE_ONLY| Installer.FLAG_CLEAR_APP_DATA_KEEP_ART_PROFILES);}}ver.buildFingerprint Build.FINGERPRINT;ver.fingerprint PackagePartitions.FINGERPRINT;}// Defer the app data fixup until we are done with app data clearing above.mPrepareAppDataFuture mAppDataHelper.fixAppsDataOnBoot();// Legacy existing (installed before Q) non-system apps to hide// their icons in launcher.if (mIsPreQUpgrade) {Slog.i(TAG, Allowlisting all existing apps to hide their icons);int size packageSettings.size();for (int i 0; i size; i) {final PackageSetting ps packageSettings.valueAt(i);if ((ps.getFlags() ApplicationInfo.FLAG_SYSTEM) ! 0) {continue;}ps.disableComponentLPw(PackageManager.APP_DETAILS_ACTIVITY_CLASS_NAME,UserHandle.USER_SYSTEM);}}// clear only after permissions and other defaults have been updatedmPromoteSystemApps false;// All the changes are done during package scanning.ver.databaseVersion Settings.CURRENT_DATABASE_VERSION;// can downgrade to readert.traceBegin(write settings);// 把Settings的内容保存到packages.xml中writeSettingsLPrTEMP();t.traceEnd();
3.2.5 BOOT_PROGRESS_PMS_READY EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_READY,SystemClock.uptimeMillis());.....//PackageInstallerService是用于管理安装会话的服务它会为每次安装过程分配一个SessionIdmInstallerService mInjector.getPackageInstallerService();final ComponentName instantAppResolverComponent getInstantAppResolver(computer);if (instantAppResolverComponent ! null) {if (DEBUG_INSTANT) {Slog.d(TAG, Set ephemeral resolver: instantAppResolverComponent);}mInstantAppResolverConnection mInjector.getInstantAppResolverConnection(instantAppResolverComponent);mInstantAppResolverSettingsComponent getInstantAppResolverSettingsLPr(computer,instantAppResolverComponent);} else {mInstantAppResolverConnection null;mInstantAppResolverSettingsComponent null;}updateInstantAppInstallerLocked(null);// Read and update the usage of dex files.// Do this at the end of PM init so that all the packages have their// data directory reconciled.// At this point we know the code paths of the packages, so we can validate// the disk file and build the internal cache.// The usage file is expected to be small so loading and verifying it// should take a fairly small time compare to the other activities (e.g. package// scanning).final MapInteger, ListPackageInfo userPackages new HashMap();for (int userId : userIds) {userPackages.put(userId, computer.getInstalledPackages(/*flags*/ 0, userId).getList());}mDexManager.load(userPackages);mDynamicCodeLogger.load(userPackages);if (mIsUpgrade) {FrameworkStatsLog.write(FrameworkStatsLog.BOOT_TIME_EVENT_DURATION_REPORTED,BOOT_TIME_EVENT_DURATION__EVENT__OTA_PACKAGE_MANAGER_INIT_TIME,SystemClock.uptimeMillis() - startTime);}//如果这是首次启动或OTA后的首次启动则将文件路径设置为预加载包的应用元数据文件if (mFirstBoot || isDeviceUpgrading()) {ArrayMapString, String paths systemConfig.getAppMetadataFilePaths();for (Map.EntryString, String entry : paths.entrySet()) {String pkgName entry.getKey();String path entry.getValue();File file new File(path);if (!file.exists()) {path null;}PackageSetting disabledPkgSetting mSettings.getDisabledSystemPkgLPr(pkgName);if (disabledPkgSetting null) {PackageSetting pkgSetting mSettings.getPackageLPr(pkgName);if (pkgSetting ! null) {pkgSetting.setAppMetadataFilePath(path);} else {Slog.w(TAG, Cannot set app metadata file for nonexistent package pkgName);}} else {disabledPkgSetting.setAppMetadataFilePath(path);}}}
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