Android PackageManagerService（三）pm命令安装流程详解

关于pm命令安装，其copy过程与下载安装不同，但安装过程却与下载过程是相同的，这里不做重复分析。

拷贝过程流程图

pm的入口在com.android.commands.pm.Pm类，那么这是如何调用到这个类的呢，这是adb命令通过adbd守护进程调用到/system/bin/pm这个脚本，其脚本源码如下：

base=/system
export CLASSPATh-$base/framework/pm.jar
exec app_process $base/bin.com.android.commands.pm.Pm "$@"

Pm类通过脚本启动，执行顺序是main->run->runInstall，然后提交session。

public static void main(String[] args) {int exitCode = 1;try {exitCode = new Pm().run(args);} catch (Exception e) {Log.e(TAG, "Error", e);System.err.println("Error: " + e);if (e instanceof RemoteException) {System.err.println(PM_NOT_RUNNING_ERR);}}System.exit(exitCode);
}

 public int run(String[] args) throws RemoteException {boolean validCommand = false;if (args.length < 1) {return showUsage();}mAm = IAccountManager.Stub.asInterface(ServiceManager.getService(Context.ACCOUNT_SERVICE));mUm = IUserManager.Stub.asInterface(ServiceManager.getService(Context.USER_SERVICE));mPm = IPackageManager.Stub.asInterface(ServiceManager.getService("package"));if (mPm == null) {System.err.println(PM_NOT_RUNNING_ERR);return 1;}mInstaller = mPm.getPackageInstaller();mArgs = args;String op = args[0];mNextArg = 1;//......//安装if ("install".equals(op)) {return runInstall();}if ("uninstall".equals(op)) {return runUninstall();}//.....
}

Pm.runInstall中首先是创建session，然后提交session，代码如下。

 private int runInstall() throws RemoteException {long startedTime = SystemClock.elapsedRealtime();//创建安装参数final InstallParams params = makeInstallParams();//app路径final String inPath = nextArg();if (params.sessionParams.sizeBytes == -1 && !STDIN_PATH.equals(inPath)) {File file = new File(inPath);if (file.isFile()) {try {//轻量级解析ApkLite baseApk = PackageParser.parseApkLite(file, 0);PackageLite pkgLite = new PackageLite(null, baseApk, null, null, null, null,null, null);params.sessionParams.setSize(PackageHelper.calculateInstalledSize(pkgLite, false,params.sessionParams.abiOverride));} catch (PackageParserException | IOException e) {System.err.println("Error: Failed to parse APK file: " + e);return 1;}} else {System.err.println("Error: Can't open non-file: " + inPath);return 1;}}//创建一个session idfinal int sessionId = doCreateSession(params.sessionParams,params.installerPackageName, params.userId);try {//copy文件if (doWriteSession(sessionId, inPath, params.sessionParams.sizeBytes, "base.apk",false /*logSuccess*/) != PackageInstaller.STATUS_SUCCESS) {return 1;}//提交sessionPair<String, Integer> status = doCommitSession(sessionId, false /*logSuccess*/);if (status.second != PackageInstaller.STATUS_SUCCESS) {return 1;}return 0;} finally {try {mInstaller.abandonSession(sessionId);} catch (Exception ignore) {}}
}

接下来看doCommitSession，根据id创建PackageInstallerSession的客户端调用commit

//PM.commit
private Pair<String, Integer> doCommitSession(int sessionId, boolean logSuccess)throws RemoteException {PackageInstaller.Session session = null;try {//根据session id  创建sessionsession = new PackageInstaller.Session(mInstaller.openSession(sessionId));final LocalIntentReceiver receiver = new LocalIntentReceiver();//跨进程提交会调用PackageInstallerSession.commitsession.commit(receiver.getIntentSender());final Intent result = receiver.getResult();final int status = result.getIntExtra(PackageInstaller.EXTRA_STATUS,PackageInstaller.STATUS_FAILURE);return new Pair<>(result.getStringExtra(PackageInstaller.EXTRA_PACKAGE_NAME), status);} finally {IoUtils.closeQuietly(session);}
}

commit 内部发一个消息，然后调用commitLocked

//PackageInstallerSession.commit
@Override
public void commit(@NonNull IntentSender statusReceiver, boolean forTransfer) {Preconditions.checkNotNull(statusReceiver);final boolean wasSealed;synchronized (mLock) {//.....mCommitted = true;mHandler.obtainMessage(MSG_COMMIT).sendToTarget();}}private final Handler.Callback mHandlerCallback = new Handler.Callback() {@Overridepublic boolean handleMessage(Message msg) {switch (msg.what) {case MSG_COMMIT:synchronized (mLock) {try {//内部调用commitLockedcommitLocked();} catch (PackageManagerException e) {final String completeMsg = ExceptionUtils.getCompleteMessage(e);destroyInternal();dispatchSessionFinished(e.error, completeMsg, null);}}break;}return true;}//PackageInstallerSession.commitLocked
private void commitLocked()throws PackageManagerException {// Unpack native librariesextractNativeLibraries(mResolvedStageDir, params.abiOverride);// Container is ready to go, let's seal it up!if (stageCid != null) {finalizeAndFixContainer(stageCid);}//.......mRelinquished = true;//调用PMS的installStagemPm.installStage(mPackageName, stageDir, stageCid, localObserver, params,mInstallerPackageName, mInstallerUid, user, mCertificates);
}

回到了PMS.installStage

void installStage(String packageName, File stagedDir, String stagedCid,IPackageInstallObserver2 observer, PackageInstaller.SessionParams sessionParams,String installerPackageName, int installerUid, UserHandle user,Certificate[][] certificates) {final VerificationInfo verificationInfo = new VerificationInfo(sessionParams.originatingUri, sessionParams.referrerUri,sessionParams.originatingUid, installerUid);final OriginInfo origin;if (stagedDir != null) {origin = OriginInfo.fromStagedFile(stagedDir);} else {origin = OriginInfo.fromStagedContainer(stagedCid);}final Message msg = mHandler.obtainMessage(INIT_COPY);final int installReason = fixUpInstallReason(installerPackageName, installerUid,sessionParams.installReason);final InstallParams params = new InstallParams(origin, null, observer,sessionParams.installFlags, installerPackageName, sessionParams.volumeUuid,verificationInfo, user, sessionParams.abiOverride,sessionParams.grantedRuntimePermissions, certificates, installReason);params.setTraceMethod("installStage").setTraceCookie(System.identityHashCode(params));msg.obj = params;//发送INIT_COPYmHandler.sendMessage(msg);
}

发送完Handler消息后就与下载安装过程相同了。请参考：Android PackageManagerService（二）下载安装详解

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