安卓高手之路之PackageManagerservice(二)

浏览数：39 / 时间：2015年06月11日

adb install 流程 - new_abc的专栏 - 博客频道 - CSDN.NET

应用安装涉及目录：        

system/app ---------------系统自带的应用程序，获得adb root权限才能删除

data/app  ---------------用户程序安装的目录。安装时把 apk文件复制到此目录

data/data ---------------存放应用程序的数据

data/dalvik-cache--------将apk中的dex文件安装到dalvik-cache目录下(dex文件是dalvik虚拟机的可执行文件,其大小约为原始apk文件大小的四分之一)

安装过程：

复制APK安装包到data/app目录下，解压并扫描安装包，把dex文件(Dalvik字节码)保存到dalvik-cache目录，并data/data目录下创建对应的应用数据目录。

卸载过程：

删除安装过程中在上述三个目录下创建的文件及目录

带着这些知识去看安装过程，可能会更容易理解引起。

当我们利用adb安装一个软件包时，到底流程是怎么样的呢，这里主要介绍一个安装包在目标机中的安装过程。

adb install 也是用的pm命令去安装的，所以开始是在pm.java中。

我们看下流程：

技术分享

1、调用pm程序开始安装

得用Pm安装时，一般是shell运行一个pm命令，并传送相应的参数，我们通过adb连接到机器，输入pm,会打出pm的一些参数

# pm

pm

usage: pm [list|path|install|uninstall]

       pm list packages [-f] [-d] [-e] [-u] [FILTER]

       pm list permission-groups

       pm list permissions [-g] [-f] [-d] [-u] [GROUP]

       pm list instrumentation [-f] [TARGET-PACKAGE]

       pm list features

       pm list libraries

       pm path PACKAGE

       pm install [-l] [-r] [-t] [-i INSTALLER_PACKAGE_NAME] [-

       pm uninstall [-k] PACKAGE

       pm clear PACKAGE

       pm enable PACKAGE_OR_COMPONENT

       pm disable PACKAGE_OR_COMPONENT

       pm setInstallLocation [0/auto] [1/internal] [2/external]

当我们安装一个软件包时，shell运行pm程序并传入pm install ***等参数，我们看下pm.java

[cpp] view plaincopyprint?
  1. public static void main(String[] args) {  
  2.         new Pm().run(args);  
  3.     }  
public static void main(String[] args) {
        new Pm().run(args);
    }

这里运行pm的run方法

[cpp] view plaincopyprint?
  1. public void run(String[] args) {  
  2.       .  
  3.       .  
  4.       if ("install".equals(op)) {  
  5.             runInstall();  
  6.             return;  
  7.         }  
  8. }  
public void run(String[] args) {
      .
      .
      if ("install".equals(op)) {
            runInstall();
            return;
        }
}



匹配到install时，运行runInstall

runInstall主要对其它参数进行解析，最后调用：

[cpp] view plaincopyprint?
  1. try {  
  2.             mPm.installPackage(Uri.fromFile(new File(apkFilePath)), obs, installFlags,  
  3.                     installerPackageName);  
  4.   
  5.             synchronized (obs) {  
  6.                 while (!obs.finished) {  
  7.                     try {  
  8.                         obs.wait();  
  9.                     } catch (InterruptedException e) {  
  10.                     }  
  11.                 }  
  12.                 if (obs.result == PackageManager.INSTALL_SUCCEEDED) {  
  13.                     System.out.println("Success");  
  14.                 } else {  
  15.                     System.err.println("Failure ["  
  16.                             + installFailureToString(obs.result)  
  17.                             + "]");  
  18.                 }  
  19.             }  
  20.         } catch (RemoteException e) {  
  21.             System.err.println(e.toString());  
  22.             System.err.println(PM_NOT_RUNNING_ERR);  
  23.         }  
try {
            mPm.installPackage(Uri.fromFile(new File(apkFilePath)), obs, installFlags,
                    installerPackageName);

            synchronized (obs) {
                while (!obs.finished) {
                    try {
                        obs.wait();
                    } catch (InterruptedException e) {
                    }
                }
                if (obs.result == PackageManager.INSTALL_SUCCEEDED) {
                    System.out.println("Success");
                } else {
                    System.err.println("Failure ["
                            + installFailureToString(obs.result)
                            + "]");
                }
            }
        } catch (RemoteException e) {
            System.err.println(e.toString());
            System.err.println(PM_NOT_RUNNING_ERR);
        }

 

2、PackageManagerService安装前处理

这里调用了PackageManager的installPackage接口，并最终调用PackageManagerService的installPackage进行具体的安装工作

在installPackage中，主要发送一条INIT_COPY消息到PackageHandler，PackageHandler处理这条消息最后调用doHandleMessage，这中间的过程就不说了，对于INIT_COPY消息 ，首先调用connectToService，连接服务DefaultContainerService

在连接成功的时候触发DefaultContainerConnection的onServiceConnected，这里面又往PackageHandler发了一条MCS_BOUND。这里面触发startCopy

[cpp] view plaincopyprint?
  1. final void startCopy() {  
  2.             try {  
  3.                 if (DEBUG_SD_INSTALL) Log.i(TAG, "startCopy");  
  4.                 retry++;  
  5.                 if (retry > MAX_RETRIES) {  
  6.                     Slog.w(TAG, "Failed to invoke remote methods on default container service. Giving up");  
  7.                     mHandler.sendEmptyMessage(MCS_GIVE_UP);  
  8.                     handleServiceError();  
  9.                     return;  
  10.                 } else {  
  11.                     handleStartCopy();  
  12.                     if (DEBUG_SD_INSTALL) Log.i(TAG, "Posting install MCS_UNBIND");  
  13.                     mHandler.sendEmptyMessage(MCS_UNBIND);  
  14.                 }  
  15.             } catch (RemoteException e) {  
  16.                 if (DEBUG_SD_INSTALL) Log.i(TAG, "Posting install MCS_RECONNECT");  
  17.                 mHandler.sendEmptyMessage(MCS_RECONNECT);  
  18.             }  
  19.             handleReturnCode();  
  20. }  
final void startCopy() {
            try {
                if (DEBUG_SD_INSTALL) Log.i(TAG, "startCopy");
                retry++;
                if (retry > MAX_RETRIES) {
                    Slog.w(TAG, "Failed to invoke remote methods on default container service. Giving up");
                    mHandler.sendEmptyMessage(MCS_GIVE_UP);
                    handleServiceError();
                    return;
                } else {
                    handleStartCopy();
                    if (DEBUG_SD_INSTALL) Log.i(TAG, "Posting install MCS_UNBIND");
                    mHandler.sendEmptyMessage(MCS_UNBIND);
                }
            } catch (RemoteException e) {
                if (DEBUG_SD_INSTALL) Log.i(TAG, "Posting install MCS_RECONNECT");
                mHandler.sendEmptyMessage(MCS_RECONNECT);
            }
            handleReturnCode();
}



handleStartCopy进行一些安装前准备工作，最后调用handleReturnCode

[cpp] view plaincopyprint?
  1. void handleReturnCode() {  
  2.            // If mArgs is null, then MCS couldn‘t be reached. When it  
  3.            // reconnects, it will try again to install. At that point, this  
  4.            // will succeed.  
  5.            if (mArgs != null) {  
  6.                processPendingInstall(mArgs, mRet);  
  7.            }  
  8.        }  
 void handleReturnCode() {
            // If mArgs is null, then MCS couldn‘t be reached. When it
            // reconnects, it will try again to install. At that point, this
            // will succeed.
            if (mArgs != null) {
                processPendingInstall(mArgs, mRet);
            }
        }



我们看下processPendingInstall

[cpp] view plaincopyprint?
  1. private void processPendingInstall(final InstallArgs args, final int currentStatus) {  
  2.     // Queue up an async operation since the package installation may take a little while.  
  3.     mHandler.post(new Runnable() {  
  4.         public void run() {  
  5.             mHandler.removeCallbacks(this);  
  6.              // Result object to be returned  
  7.             PackageInstalledInfo res = new PackageInstalledInfo();  
  8.             res.returnCode = currentStatus;  
  9.             res.uid = -1;  
  10.             res.pkg = null;  
  11.             res.removedInfo = new PackageRemovedInfo();  
  12.             if (res.returnCode == PackageManager.INSTALL_SUCCEEDED) {  
  13.                 args.doPreInstall(res.returnCode);  
  14.                 synchronized (mInstallLock) {  
  15.                     installPackageLI(args, true, res);  
  16.                 }  
  17.                 args.doPostInstall(res.returnCode);  
  18.             }  
  19.   
  20.             // A restore should be performed at this point if (a) the install  
  21.             // succeeded, (b) the operation is not an update, and (c) the new  
  22.             // package has a backupAgent defined.  
  23.             final boolean update = res.removedInfo.removedPackage != null;  
  24.             boolean doRestore = (!update  
  25.                     && res.pkg != null  
  26.                     && res.pkg.applicationInfo.backupAgentName != null);  
  27.   
  28.             // Set up the post-install work request bookkeeping.  This will be used  
  29.             // and cleaned up by the post-install event handling regardless of whether  
  30.             // there‘s a restore pass performed.  Token values are >= 1.  
  31.             int token;  
  32.             if (mNextInstallToken < 0) mNextInstallToken = 1;  
  33.             token = mNextInstallToken++;  
  34.   
  35.             PostInstallData data = new PostInstallData(args, res);  
  36.             mRunningInstalls.put(token, data);  
  37.             if (DEBUG_INSTALL) Log.v(TAG, "+ starting restore round-trip " + token);  
  38.   
  39.             if (res.returnCode == PackageManager.INSTALL_SUCCEEDED && doRestore) {  
  40.                 // Pass responsibility to the Backup Manager.  It will perform a  
  41.                 // restore if appropriate, then pass responsibility back to the  
  42.                 // Package Manager to run the post-install observer callbacks  
  43.                 // and broadcasts.  
  44.                 IBackupManager bm = IBackupManager.Stub.asInterface(  
  45.                         ServiceManager.getService(Context.BACKUP_SERVICE));  
  46.                 if (bm != null) {  
  47.                     if (DEBUG_INSTALL) Log.v(TAG, "token " + token  
  48.                             + " to BM for possible restore");  
  49.                     try {  
  50.                         bm.restoreAtInstall(res.pkg.applicationInfo.packageName, token);  
  51.                     } catch (RemoteException e) {  
  52.                         // can‘t happen; the backup manager is local  
  53.                     } catch (Exception e) {  
  54.                         Slog.e(TAG, "Exception trying to enqueue restore", e);  
  55.                         doRestore = false;  
  56.                     }  
  57.                 } else {  
  58.                     Slog.e(TAG, "Backup Manager not found!");  
  59.                     doRestore = false;  
  60.                 }  
  61.             }  
  62.   
  63.             if (!doRestore) {  
  64.                 // No restore possible, or the Backup Manager was mysteriously not  
  65.                 // available -- just fire the post-install work request directly.  
  66.                 if (DEBUG_INSTALL) Log.v(TAG, "No restore - queue post-install for " + token);  
  67.                 Message msg = mHandler.obtainMessage(POST_INSTALL, token, 0);  
  68.                 mHandler.sendMessage(msg);  
  69.             }  
  70.         }  
  71.     });  
  72. }  
    private void processPendingInstall(final InstallArgs args, final int currentStatus) {
        // Queue up an async operation since the package installation may take a little while.
        mHandler.post(new Runnable() {
            public void run() {
                mHandler.removeCallbacks(this);
                 // Result object to be returned
                PackageInstalledInfo res = new PackageInstalledInfo();
                res.returnCode = currentStatus;
                res.uid = -1;
                res.pkg = null;
                res.removedInfo = new PackageRemovedInfo();
                if (res.returnCode == PackageManager.INSTALL_SUCCEEDED) {
                    args.doPreInstall(res.returnCode);
                    synchronized (mInstallLock) {
                        installPackageLI(args, true, res);
                    }
                    args.doPostInstall(res.returnCode);
                }

                // A restore should be performed at this point if (a) the install
                // succeeded, (b) the operation is not an update, and (c) the new
                // package has a backupAgent defined.
                final boolean update = res.removedInfo.removedPackage != null;
                boolean doRestore = (!update
                        && res.pkg != null
                        && res.pkg.applicationInfo.backupAgentName != null);

                // Set up the post-install work request bookkeeping.  This will be used
                // and cleaned up by the post-install event handling regardless of whether
                // there‘s a restore pass performed.  Token values are >= 1.
                int token;
                if (mNextInstallToken < 0) mNextInstallToken = 1;
                token = mNextInstallToken++;

                PostInstallData data = new PostInstallData(args, res);
                mRunningInstalls.put(token, data);
                if (DEBUG_INSTALL) Log.v(TAG, "+ starting restore round-trip " + token);

                if (res.returnCode == PackageManager.INSTALL_SUCCEEDED && doRestore) {
                    // Pass responsibility to the Backup Manager.  It will perform a
                    // restore if appropriate, then pass responsibility back to the
                    // Package Manager to run the post-install observer callbacks
                    // and broadcasts.
                    IBackupManager bm = IBackupManager.Stub.asInterface(
                            ServiceManager.getService(Context.BACKUP_SERVICE));
                    if (bm != null) {
                        if (DEBUG_INSTALL) Log.v(TAG, "token " + token
                                + " to BM for possible restore");
                        try {
                            bm.restoreAtInstall(res.pkg.applicationInfo.packageName, token);
                        } catch (RemoteException e) {
                            // can‘t happen; the backup manager is local
                        } catch (Exception e) {
                            Slog.e(TAG, "Exception trying to enqueue restore", e);
                            doRestore = false;
                        }
                    } else {
                        Slog.e(TAG, "Backup Manager not found!");
                        doRestore = false;
                    }
                }

                if (!doRestore) {
                    // No restore possible, or the Backup Manager was mysteriously not
                    // available -- just fire the post-install work request directly.
                    if (DEBUG_INSTALL) Log.v(TAG, "No restore - queue post-install for " + token);
                    Message msg = mHandler.obtainMessage(POST_INSTALL, token, 0);
                    mHandler.sendMessage(msg);
                }
            }
        });
    }

这里New了一个消息，把它的callback设置为这里new出来的Runnable，这里重载了run方法，最后会通过Handle,Looper，Message机制调用到这个run方法中进行。

这里主要是调用了installPackageLI函数进行安装

3、解析apk

在installPackageLI中，会new 一个PackageParser对package进行解析，调用parsePackage函数 parsePackage(File sourceFile, String destCodePath,

            DisplayMetrics metrics, int flags)函数根据参数进行一些处理后最终调用parsePackage(

        Resources res, XmlResourceParser parser, int flags, String[] outError)对包进行解析，我们看到这个函数里面主要对配置文件AndroidManifest.xml文件进行了解析。我们会看到如下类似的代码

[cpp] view plaincopyprint?
  1.     private Package parsePackage(  
  2.         Resources res, XmlResourceParser parser, int flags, String[] outError)  
  3.         throws XmlPullParserException, IOException {  
  4.    .  
  5.    .  
  6.     int outerDepth = parser.getDepth();  
  7.         while ((type=parser.next()) != parser.END_DOCUMENT  
  8.                && (type != parser.END_TAG || parser.getDepth() > outerDepth)) {  
  9.             if (type == parser.END_TAG || type == parser.TEXT) {  
  10.                 continue;  
  11.             }  
  12.   
  13.             String tagName = parser.getName();  
  14.             if (tagName.equals("application")) {  
  15.                 if (foundApp) {  
  16.                     if (RIGID_PARSER) {  
  17.                         outError[0] = "<manifest> has more than one <application>";  
  18.                         mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED;  
  19.                         return null;  
  20.                     } else {  
  21.                         Log.w(TAG, "<manifest> has more than one <application>");  
  22.                         XmlUtils.skipCurrentTag(parser);  
  23.                         continue;  
  24.                     }  
  25.                 }  
  26.    .  
  27.    .  
  28. }  
    private Package parsePackage(
        Resources res, XmlResourceParser parser, int flags, String[] outError)
        throws XmlPullParserException, IOException {
   .
   .
    int outerDepth = parser.getDepth();
        while ((type=parser.next()) != parser.END_DOCUMENT
               && (type != parser.END_TAG || parser.getDepth() > outerDepth)) {
            if (type == parser.END_TAG || type == parser.TEXT) {
                continue;
            }

            String tagName = parser.getName();
            if (tagName.equals("application")) {
                if (foundApp) {
                    if (RIGID_PARSER) {
                        outError[0] = "<manifest> has more than one <application>";
                        mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED;
                        return null;
                    } else {
                        Log.w(TAG, "<manifest> has more than one <application>");
                        XmlUtils.skipCurrentTag(parser);
                        continue;
                    }
                }
   .
   .
}

4、安装包

解析完之后 ，调用installNewPackageLI进行包的安装

这里主要调用了scanPackageLI，对包进行安装，及保存package、provider、service、receiver和activity等信息保存在PackageManagerService服务中，我们会看到有如下代码

[cpp] view plaincopyprint?
  1.  private PackageParser.Package scanPackageLI(PackageParser.Package pkg,  
  2.             int parseFlags, int scanMode, long currentTime) {  
  3.                                 // And now re-install the app.  
  4.                                 ret = mInstaller.install(pkgName, useEncryptedFSDir, pkg.applicationInfo.uid,  
  5.                                         pkg.applicationInfo.uid);  
  6.                                  
  7.    .  
  8.      
  9.     // Add the new setting to mSettings  
  10.             mSettings.insertPackageSettingLP(pkgSetting, pkg);  
  11.             // Add the new setting to mPackages  
  12.             mPackages.put(pkg.applicationInfo.packageName, pkg);  
  13.             // Make sure we don‘t accidentally delete its data.  
  14.             mSettings.mPackagesToBeCleaned.remove(pkgName);  
  15. ｝  
 private PackageParser.Package scanPackageLI(PackageParser.Package pkg,
            int parseFlags, int scanMode, long currentTime) {
                                // And now re-install the app.
                                ret = mInstaller.install(pkgName, useEncryptedFSDir, pkg.applicationInfo.uid,
                                        pkg.applicationInfo.uid);

   .

    // Add the new setting to mSettings
            mSettings.insertPackageSettingLP(pkgSetting, pkg);
            // Add the new setting to mPackages
            mPackages.put(pkg.applicationInfo.packageName, pkg);
            // Make sure we don‘t accidentally delete its data.
            mSettings.mPackagesToBeCleaned.remove(pkgName);
｝



这里的install最终会通过socket通信调用到installd.c中的do_install，其实也就是创建了一些目录而已。

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