Android应用程序安装过程浅析
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我们知道在android中。安装应用是由PackageManager来管理的，可是我们发现PackageManager是一个抽象类。他的installPackage方法也没有详细的实现。
那在安装过程中是怎么运行的呐？
调用方
查看代码能够知道ApplicationPackageManager是直接继承自PackageManager的。所以终于代码会调用ApplicationPackageManager下的installPackage(Uri packageURI, IPackageInstallObserver observer, int flags,String installerPackageName)，而在installPackage里面又调用了installCommon。
installCommon的实现例如以下：
private void installCommon(Uri packageURI,
PackageInstallObserver observer, int flags, String installerPackageName,
VerificationParams verificationParams, ContainerEncryptionParams encryptionParams) {
if (!"file".equals(packageURI.getScheme())) {
throw new UnsupportedOperationException("Only file:// URIs are supported");
}
if (encryptionParams != null) {
throw new UnsupportedOperationException("ContainerEncryptionParams not supported");
}
final String originPath = packageURI.getPath();
try {
mPM.installPackage(originPath, observer.getBinder(), flags, installerPackageName,
verificationParams, null);
} catch (RemoteException ignored) {
}
}能够看到在installCommon终于调用了mPm.installPackage那mPm又是什么？能够发现mPM是一个IPackageManager，他在是ApplicationPackageManager的构造函数中传入的。那是什么时候调用构造函数的呐？在ContextImpl中调用getPackageManager时会进行调用，传入的pm在是ActivityThread中获取的。
@Override
public PackageManager getPackageManager() {
if (mPackageManager != null) {
return mPackageManager;
}
IPackageManager pm = ActivityThread.getPackageManager();
if (pm != null) {
// Doesn‘t matter if we make more than one instance.
return (mPackageManager = new ApplicationPackageManager(this, pm));
}
return null;
}我们再来看看ActivityThread.getPackageManager()的获取过程。它的代码例如以下：
public static IPackageManager getPackageManager() {
if (sPackageManager != null) {
//Slog.v("PackageManager", "returning cur default = " + sPackageManager);
return sPackageManager;
}
IBinder b = ServiceManager.getService("package");
//Slog.v("PackageManager", "default service binder = " + b);
sPackageManager = IPackageManager.Stub.asInterface(b);
//Slog.v("PackageManager", "default service = " + sPackageManager);
return sPackageManager;
}从上面能够看到IPackageManager是进程间通信的客户端， 首先是IPackageManager是通过IPackageManager.aidl文件生成，同一时候生成了存根类IPackageManager.Stub。代理类：IPackageManager.Stub.Proxy。他是IBinder类型，那远端又是谁呐？远端就是PackageManagerService，PackageManagerService继承自IPackageManager.Stub，因此终于的调用都是通过aidl由PackageManagerService运行。
因此我们主要来看看PackageManagerService中的运行过程。
安装方式
主要有几种方式。这里先来看看下面两种:
1：系统启动后扫描安装，会调用PackageManagerService的scanPackageLI函数，
2：应用市场安装，应用市场下载后会默认调用PackageManagerService的intallPackage函数。该函数终于也会调用到scanPackageLI。因此仅仅须要分析另外一种
流程图
我们能够大致看看代码调用的过程，流程图例如以下：
运行过程
因为PackageManager终于是由PackageManagerService来运行的
@Override
public void installPackage(String originPath, IPackageInstallObserver2 observer,
int installFlags, String installerPackageName, VerificationParams verificationParams,
String packageAbiOverride) {
installPackageAsUser(originPath, observer, installFlags, installerPackageName,
verificationParams, packageAbiOverride, UserHandle.getCallingUserId());
}主要传递了6个參数：
1，originPath，安装包的位置，他必须是file类型活在content的URI类型。
这里传递过来的是toString的一个字符串。
2，observer，是一个IPackageInstallObserver类型，通知回调调用者安装完毕
3。installFlags，他的值是INSTALL_FORWARD_LOCK，INSTALL_REPLACE_EXISTING。INSTALL_ALLOW_TEST三个中的一个，INSTALL_FORWARD_LOCK表示安装过程中是否锁定。INSTALL_REPLACE_EXISTING表示是否替换安装包。INSTALL_ALLOW_TEST是否測试安装包。假设有改标志，manifest必须配置android:testOnly
4。installerPackageName，安装包包名
5。verificationParams。代表验证參数用于验证包安装。
6，packageAbiOverride，一般传null
该函数调用了installPackageAsUser函数，installPackageAsUser函数例如以下：
@Override
public void installPackageAsUser(String originPath, IPackageInstallObserver2 observer,
int installFlags, String installerPackageName, VerificationParams verificationParams,
String packageAbiOverride, int userId) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.INSTALL_PACKAGES, null);
final int callingUid = Binder.getCallingUid();
enforceCrossUserPermission(callingUid, userId, true, true, "installPackageAsUser");
if (isUserRestricted(userId, UserManager.DISALLOW_INSTALL_APPS)) {
try {
if (observer != null) {
observer.onPackageInstalled("", INSTALL_FAILED_USER_RESTRICTED, null, null);
}
} catch (RemoteException re) {
}
return;
}
if ((callingUid == Process.SHELL_UID) || (callingUid == Process.ROOT_UID)) {
installFlags |= PackageManager.INSTALL_FROM_ADB;
} else {
// Caller holds INSTALL_PACKAGES permission, so we‘re less strict
// about installerPackageName.
installFlags &= ~PackageManager.INSTALL_FROM_ADB;
installFlags &= ~PackageManager.INSTALL_ALL_USERS;
}
UserHandle user;
if ((installFlags & PackageManager.INSTALL_ALL_USERS) != 0) {
user = UserHandle.ALL;
} else {
user = new UserHandle(userId);
}
// Only system components can circumvent runtime permissions when installing.
if ((installFlags & PackageManager.INSTALL_GRANT_RUNTIME_PERMISSIONS) != 0
&& mContext.checkCallingOrSelfPermission(Manifest.permission
.INSTALL_GRANT_RUNTIME_PERMISSIONS) == PackageManager.PERMISSION_DENIED) {
throw new SecurityException("You need the "
+ "android.permission.INSTALL_GRANT_RUNTIME_PERMISSIONS permission "
+ "to use the PackageManager.INSTALL_GRANT_RUNTIME_PERMISSIONS flag");
}
verificationParams.setInstallerUid(callingUid);
final File originFile = new File(originPath);
final OriginInfo origin = OriginInfo.fromUntrustedFile(originFile);
final Message msg = mHandler.obtainMessage(INIT_COPY);
msg.obj = new InstallParams(origin, null, observer, installFlags, installerPackageName,
null, verificationParams, user, packageAbiOverride, null);
mHandler.sendMessage(msg);
}该函数主要做了下面操作，第一获取权限，假设被拒绝则退出运行，接着设置installFlags參数，最后一步发送了一个what为INIT_COPY的message。參数为InstallParams，记住该參数，后面还会多次用到。看what的名称INIT_COPY，看起来是表达初始化而且拷贝，那是不是真是这样呐？我们去看看这个操作，这个操做是PackageHandler来运行的。PackageHandler继续字Handler，那我们来详细看看运行代码：
case INIT_COPY: {
HandlerParams params = (HandlerParams) msg.obj;
int idx = mPendingInstalls.size();
if (DEBUG_INSTALL) Slog.i(TAG, "init_copy idx=" + idx + ": " + params);
// If a bind was already initiated we dont really
// need to do anything. The pending install
// will be processed later on.
if (!mBound) {
// If this is the only one pending we might
// have to bind to the service again.
if (!connectToService()) {
Slog.e(TAG, "Failed to bind to media container service");
params.serviceError();
return;
} else {
// Once we bind to the service, the first
// pending request will be processed.
mPendingInstalls.add(idx, params);
}
} else {
mPendingInstalls.add(idx, params);
// Already bound to the service. Just make
// sure we trigger off processing the first request.
if (idx == 0) {
mHandler.sendEmptyMessage(MCS_BOUND);
}
}
break;
}能够看到首先取出參数params，这个params就是之前传入的InstallParams。接着获取等待安装队列的内容个数，因为初始mBound为false，因此会进入该推断。之后运行了connectToService函数。如个返回false表示连接失败，直接行使params的serviceError函数来结束当前运行，假设为true这时将params加入到mPendingInstalls的最后一个位置，connectToService函数又是什么呐？当前代码也没有不论什么初始化和copy有关的操作啊？那我们就去看看connectToService到底干了什么？
private boolean connectToService() {
if (DEBUG_SD_INSTALL) Log.i(TAG, "Trying to bind to" +
" DefaultContainerService");
Intent service = new Intent().setComponent(DEFAULT_CONTAINER_COMPONENT);
Process.setThreadPriority(Process.THREAD_PRIORITY_DEFAULT);
if (mContext.bindServiceAsUser(service, mDefContainerConn,
Context.BIND_AUTO_CREATE, UserHandle.OWNER)) {
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
mBound = true;
return true;
}
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
return false;
}能够看到这里bind到了一个service，service的名称是DefaultContainerService，这又是个什么service呐？而且在绑定之前先设置该进程的优先级为THREAD_PRIORITY_DEFAULT，运行完毕后再次设置为THREAD_PRIORITY_BACKGROUND。这里我们也没有看到有不论什么init/copy的操作。那init/copy操作到底在什么地方，绑定的这个服务又是什么？我们来分析一下代码，看到bindServiceAsUser中有一个connection參数。我们来看看connection參数，这个connection类型是DefaultContainerConnection：
class DefaultContainerConnection implements ServiceConnection {
public void onServiceConnected(ComponentName name, IBinder service) {
if (DEBUG_SD_INSTALL) Log.i(TAG, "onServiceConnected");
IMediaContainerService imcs =
IMediaContainerService.Stub.asInterface(service);
mHandler.sendMessage(mHandler.obtainMessage(MCS_BOUND, imcs));
}
public void onServiceDisconnected(ComponentName name) {
if (DEBUG_SD_INSTALL) Log.i(TAG, "onServiceDisconnected");
}
}能够看到当绑定成功后在onServiceConnected中将一个IBinder转换成了一个IMediaContainerService，这个又是什么呐？这个就是在onServiceConnected回调函数中依据參数传进来的IMediaContainerService.Stub的对象引用创建的一个远程代理对象。以后PackageManagerService服务通过该代理对象訪问DefaultContainerService服务。
DefaultContainerService是一个应用服务。详细负责实现APK等相关资源文件在内部或外部存储器上的存储工作，DefaultContainerService服务中提供了一个IMediaContainerService.Stub桩对象。
转换后，接下来我们看到这里又发送了一个what为MCS_BOUND的message，參数为之前获得的IMediaContainerService，这里也没有不论什么init/copy操作。那我们继续跟进看看该what运行了什么？
case MCS_BOUND: {
if (DEBUG_INSTALL) Slog.i(TAG, "mcs_bound");
if (msg.obj != null) {
mContainerService = (IMediaContainerService) msg.obj;
}
if (mContainerService == null) {
if (!mBound) {
// Something seriously wrong since we are not bound and we are not
// waiting for connection. Bail out.
Slog.e(TAG, "Cannot bind to media container service");
for (HandlerParams params : mPendingInstalls) {
// Indicate service bind error
params.serviceError();
}
mPendingInstalls.clear();
} else {
Slog.w(TAG, "Waiting to connect to media container service");
}
} else if (mPendingInstalls.size() > 0) {
HandlerParams params = mPendingInstalls.get(0);
if (params != null) {
if (params.startCopy()) {
// We are done... look for more work or to
// go idle.
if (DEBUG_SD_INSTALL) Log.i(TAG,
"Checking for more work or unbind...");
// Delete pending install
if (mPendingInstalls.size() > 0) {
mPendingInstalls.remove(0);
}
if (mPendingInstalls.size() == 0) {
if (mBound) {
if (DEBUG_SD_INSTALL) Log.i(TAG,
"Posting delayed MCS_UNBIND");
removeMessages(MCS_UNBIND);
Message ubmsg = obtainMessage(MCS_UNBIND);
// Unbind after a little delay, to avoid
// continual thrashing.
sendMessageDelayed(ubmsg, 10000);
}
} else {
// There are more pending requests in queue.
// Just post MCS_BOUND message to trigger processing
// of next pending install.
if (DEBUG_SD_INSTALL) Log.i(TAG,
"Posting MCS_BOUND for next work");
mHandler.sendEmptyMessage(MCS_BOUND);
}
}
}
} else {
// Should never happen ideally.
Slog.w(TAG, "Empty queue");
}
break;
}能够看到这里首先获取了传入的參数，假设參数为空，则调用HandlerParams的serviceError，而且清空mPendingInstalls列表，否则获取到等待安装列表中的第一个对象，就是我们最初始加入进的InstallParams，这里我们看到调用了InstallParams的startCopy函数。运行完毕后移除该參数，假设等待安装列表为空且当前绑定状态为true。则发一个what为MCS_UNBIND的解绑操作，否则就继续运行该操作。将等待列表中的一个一个运行。MCS_UNBIND与MCS_RECONNECT，这就不详细说了。MCS_UNBIND主要是解绑之前的链接，MCS_RECONNECT是又一次绑定链接，那我们继续看看startCopy函数：
final boolean startCopy() {
boolean res;
try {
if (DEBUG_INSTALL) Slog.i(TAG, "startCopy " + mUser + ": " + this);
if (++mRetries > MAX_RETRIES) {
Slog.w(TAG, "Failed to invoke remote methods on default container service. Giving up");
mHandler.sendEmptyMessage(MCS_GIVE_UP);
handleServiceError();
return false;
} else {
handleStartCopy();
res = true;
}
} catch (RemoteException e) {
if (DEBUG_INSTALL) Slog.i(TAG, "Posting install MCS_RECONNECT");
mHandler.sendEmptyMessage(MCS_RECONNECT);
res = false;
}
handleReturnCode();
return res;
}这里最多会重试4次，假设超过最大次数则发送一个what为MCS_GIVE_UP的message表示安装失败，否则调用handleStartCopy。我们来看看handleStartCopy。因为取出的是InstallParams參数。因此这里调用的是InstallParams的handleStartCopy函数：
/*
* Invoke remote method to get package information and install
* location values. Override install location based on default
* policy if needed and then create install arguments based
* on the install location.
*/
public void handleStartCopy() throws RemoteException {
int ret = PackageManager.INSTALL_SUCCEEDED;
// If we‘re already staged, we‘ve firmly committed to an install location
if (origin.staged) {
if (origin.file != null) {
installFlags |= PackageManager.INSTALL_INTERNAL;
installFlags &= ~PackageManager.INSTALL_EXTERNAL;
} else if (origin.cid != null) {
installFlags |= PackageManager.INSTALL_EXTERNAL;
installFlags &= ~PackageManager.INSTALL_INTERNAL;
} else {
throw new IllegalStateException("Invalid stage location");
}
}
final boolean onSd = (installFlags & PackageManager.INSTALL_EXTERNAL) != 0;
final boolean onInt = (installFlags & PackageManager.INSTALL_INTERNAL) != 0;
PackageInfoLite pkgLite = null;
if (onInt && onSd) {
// Check if both bits are set.
Slog.w(TAG, "Conflicting flags specified for installing on both internal and external");
ret = PackageManager.INSTALL_FAILED_INVALID_INSTALL_LOCATION;
} else {
pkgLite = mContainerService.getMinimalPackageInfo(origin.resolvedPath, installFlags,
packageAbiOverride);
/*
* If we have too little free space, try to free cache
* before giving up.
*/
if (!origin.staged && pkgLite.recommendedInstallLocation
== PackageHelper.RECOMMEND_FAILED_INSUFFICIENT_STORAGE) {
// TODO: focus freeing disk space on the target device
final StorageManager storage = StorageManager.from(mContext);
final long lowThreshold = storage.getStorageLowBytes(
Environment.getDataDirectory());
final long sizeBytes = mContainerService.calculateInstalledSize(
origin.resolvedPath, isForwardLocked(), packageAbiOverride);
if (mInstaller.freeCache(null, sizeBytes + lowThreshold) >= 0) {
pkgLite = mContainerService.getMinimalPackageInfo(origin.resolvedPath,
installFlags, packageAbiOverride);
}
/*
* The cache free must have deleted the file we
* downloaded to install.
*
* TODO: fix the "freeCache" call to not delete
* the file we care about.
*/
if (pkgLite.recommendedInstallLocation
== PackageHelper.RECOMMEND_FAILED_INVALID_URI) {
pkgLite.recommendedInstallLocation
= PackageHelper.RECOMMEND_FAILED_INSUFFICIENT_STORAGE;
}
}
}
// 设置ret
final InstallArgs args = createInstallArgs(this);
mArgs = args;
if (ret == PackageManager.INSTALL_SUCCEEDED) {
/*
* ADB installs appear as UserHandle.USER_ALL, and can only be performed by
* UserHandle.USER_OWNER, so use the package verifier for UserHandle.USER_OWNER.
*/
int userIdentifier = getUser().getIdentifier();
if (userIdentifier == UserHandle.USER_ALL
&& ((installFlags & PackageManager.INSTALL_FROM_ADB) != 0)) {
userIdentifier = UserHandle.USER_OWNER;
}
/*
* Determine if we have any installed package verifiers. If we
* do, then we‘ll defer to them to verify the packages.
*/
final int requiredUid = mRequiredVerifierPackage == null ? -1
: getPackageUid(mRequiredVerifierPackage, userIdentifier);
if (!origin.existing && requiredUid != -1
&& isVerificationEnabled(userIdentifier, installFlags)) {
final Intent verification = new Intent(
Intent.ACTION_PACKAGE_NEEDS_VERIFICATION);
verification.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
verification.setDataAndType(Uri.fromFile(new File(origin.resolvedPath)),
PACKAGE_MIME_TYPE);
verification.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
final List<ResolveInfo> receivers = queryIntentReceivers(verification,
PACKAGE_MIME_TYPE, PackageManager.GET_DISABLED_COMPONENTS,
0 /* TODO: Which userId? */);
if (DEBUG_VERIFY) {
Slog.d(TAG, "Found " + receivers.size() + " verifiers for intent "
+ verification.toString() + " with " + pkgLite.verifiers.length
+ " optional verifiers");
}
final int verificationId = mPendingVerificationToken++;
verification.putExtra(PackageManager.EXTRA_VERIFICATION_ID, verificationId);、
.......
设置verification的參数
final PackageVerificationState verificationState = new PackageVerificationState(
requiredUid, args);
mPendingVerification.append(verificationId, verificationState);
final List<ComponentName> sufficientVerifiers = matchVerifiers(pkgLite,
receivers, verificationState);
// Apps installed for "all" users use the device owner to verify the app
UserHandle verifierUser = getUser();
if (verifierUser == UserHandle.ALL) {
verifierUser = UserHandle.OWNER;
}
/*
* If any sufficient verifiers were listed in the package
* manifest, attempt to ask them.
*/
if (sufficientVerifiers != null) {
final int N = sufficientVerifiers.size();
if (N == 0) {
Slog.i(TAG, "Additional verifiers required, but none installed.");
ret = PackageManager.INSTALL_FAILED_VERIFICATION_FAILURE;
} else {
for (int i = 0; i < N; i++) {
final ComponentName verifierComponent = sufficientVerifiers.get(i);
final Intent sufficientIntent = new Intent(verification);
sufficientIntent.setComponent(verifierComponent);
mContext.sendBroadcastAsUser(sufficientIntent, verifierUser);
}
}
}
final ComponentName requiredVerifierComponent = matchComponentForVerifier(
mRequiredVerifierPackage, receivers);
if (ret == PackageManager.INSTALL_SUCCEEDED
&& mRequiredVerifierPackage != null) {
/*
* Send the intent to the required verification agent,
* but only start the verification timeout after the
* target BroadcastReceivers have run.
*/
verification.setComponent(requiredVerifierComponent);
mContext.sendOrderedBroadcastAsUser(verification, verifierUser,
android.Manifest.permission.PACKAGE_VERIFICATION_AGENT,
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final Message msg = mHandler
.obtainMessage(CHECK_PENDING_VERIFICATION);
msg.arg1 = verificationId;
mHandler.sendMessageDelayed(msg, getVerificationTimeout());
}
}, null, 0, null, null);
/*
* We don‘t want the copy to proceed until verification
* succeeds, so null out this field.
*/
mArgs = null;
}
} else {
/*
* No package verification is enabled, so immediately start
* the remote call to initiate copy using temporary file.
*/
ret = args.copyApk(mContainerService, true);
}
}
mRet = ret;
}
@Override
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);
}
}首先设置installFlags參数，之后设置ret參数与verification參数，之后依据參数创建了InstallArgs參数，依据參数这里实际返回的是AsecInstallArgs类型，假设该包须要被验证，则发送一个广播进行包验证，否则直接拷贝apk。广播的onReceive中发送了一个what为CHECK_PENDING_VERIFICATION的message，參数为verificationId。handleReturnCode中直接调用了processPendingInstall来进行安装处理，我们先来看看CHECK_PENDING_VERIFICATION的处理，这里终于也会调用到processPendingInstall。
case CHECK_PENDING_VERIFICATION: {
final int verificationId = msg.arg1;
final PackageVerificationState state = mPendingVerification.get(verificationId);
if ((state != null) && !state.timeoutExtended()) {
final InstallArgs args = state.getInstallArgs();
final Uri originUri = Uri.fromFile(args.origin.resolvedFile);
Slog.i(TAG, "Verification timed out for " + originUri);
mPendingVerification.remove(verificationId);
int ret = PackageManager.INSTALL_FAILED_VERIFICATION_FAILURE;
if (getDefaultVerificationResponse() == PackageManager.VERIFICATION_ALLOW) {
Slog.i(TAG, "Continuing with installation of " + originUri);
state.setVerifierResponse(Binder.getCallingUid(),
PackageManager.VERIFICATION_ALLOW_WITHOUT_SUFFICIENT);
broadcastPackageVerified(verificationId, originUri,
PackageManager.VERIFICATION_ALLOW,
state.getInstallArgs().getUser());
try {
ret = args.copyApk(mContainerService, true);
} catch (RemoteException e) {
Slog.e(TAG, "Could not contact the ContainerService");
}
} else {
broadcastPackageVerified(verificationId, originUri,
PackageManager.VERIFICATION_REJECT,
state.getInstallArgs().getUser());
}
processPendingInstall(args, ret);
mHandler.sendEmptyMessage(MCS_UNBIND);
}
break;
}验证完毕后发送一个验证完毕的广播，之后调用InstallArgs的copyApk函数拷贝包。这里的InstallArgs是什么类型呐？就是前面创建的AsecInstallArgs类型。因此运行的是AsecInstallArgs的copyApk函数。运行完毕后调用processPendingInstall。copyApk主要是拷贝包到指定的文件夹下。这里就不详述了。接着看看processPendingInstall函数：
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, res);
}
args.doPostInstall(res.returnCode, res.uid);
}
// 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 not opted out of backup participation.
final boolean update = res.removedInfo.removedPackage != null;
final int flags = (res.pkg == null) ? 0 : res.pkg.applicationInfo.flags;
boolean doRestore = !update
&& ((flags & ApplicationInfo.FLAG_ALLOW_BACKUP) != 0);
// 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 {
if (bm.isBackupServiceActive(UserHandle.USER_OWNER)) {
bm.restoreAtInstall(res.pkg.applicationInfo.packageName, token);
} else {
doRestore = false;
}
} 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post一个Runnable来运行内部的逻辑，主要做了例如以下操作：
1。锁定后安装包。通过调用installPackageLI来进行的
2，接下来都是运行备份操作，备份是通过BackupManagerService来完毕的。备份完毕后，通过发送what为POST_INSTALL的message来继续处理
我们先来看看installPackageLI的运行过程：
private void installPackageLI(InstallArgs args, PackageInstalledInfo res) {
//...... 初始化參数....
PackageParser pp = new PackageParser();
pp.setSeparateProcesses(mSeparateProcesses);
pp.setDisplayMetrics(mMetrics);
final PackageParser.Package pkg;
try {
pkg = pp.parsePackage(tmpPackageFile, parseFlags);
} catch (PackageParserException e) {
res.setError("Failed parse during installPackageLI", e);
return;
}
.................
String oldCodePath = null;
boolean systemApp = false;
synchronized (mPackages) {
// Check if installing already existing package
if ((installFlags & PackageManager.INSTALL_REPLACE_EXISTING) != 0) {
String oldName = mSettings.mRenamedPackages.get(pkgName);
if (pkg.mOriginalPackages != null
&& pkg.mOriginalPackages.contains(oldName)
&& mPackages.containsKey(oldName)) {
// This package is derived from an original package,
// and this device has been updating from that original
// name. We must continue using the original name, so
// rename the new package here.
pkg.setPackageName(oldName);
pkgName = pkg.packageName;
replace = true;
if (DEBUG_INSTALL) Slog.d(TAG, "Replacing existing renamed package: oldName="
+ oldName + " pkgName=" + pkgName);
} else if (mPackages.containsKey(pkgName)) {
// This package, under its official name, already exists
// on the device; we should replace it.
replace = true;
if (DEBUG_INSTALL) Slog.d(TAG, "Replace existing pacakge: " + pkgName);
}
// Prevent apps opting out from runtime permissions
if (replace) {
PackageParser.Package oldPackage = mPackages.get(pkgName);
final int oldTargetSdk = oldPackage.applicationInfo.targetSdkVersion;
final int newTargetSdk = pkg.applicationInfo.targetSdkVersion;
if (oldTargetSdk > Build.VERSION_CODES.LOLLIPOP_MR1
&& newTargetSdk <= Build.VERSION_CODES.LOLLIPOP_MR1) {
res.setError(PackageManager.INSTALL_FAILED_PERMISSION_MODEL_DOWNGRADE,
"Package " + pkg.packageName + " new target SDK " + newTargetSdk
+ " doesn‘t support runtime permissions but the old"
+ " target SDK " + oldTargetSdk + " does.");
return;
}
}
}
...............
// Check whether the newly-scanned package wants to define an already-defined perm
int N = pkg.permissions.size();
for (int i = N-1; i >= 0; i--) {
PackageParser.Permission perm = pkg.permissions.get(i);
BasePermission bp = mSettings.mPermissions.get(perm.info.name);
if (bp != null) {
// If the defining package is signed with our cert, it‘s okay. This
// also includes the "updating the same package" case, of course.
// "updating same package" could also involve key-rotation.
final boolean sigsOk;
if (bp.sourcePackage.equals(pkg.packageName)
&& (bp.packageSetting instanceof PackageSetting)
&& (shouldCheckUpgradeKeySetLP((PackageSetting) bp.packageSetting,
scanFlags))) {
sigsOk = checkUpgradeKeySetLP((PackageSetting) bp.packageSetting, pkg);
} else {
sigsOk = compareSignatures(bp.packageSetting.signatures.mSignatures,
pkg.mSignatures) == PackageManager.SIGNATURE_MATCH;
}
if (!sigsOk) {
// If the owning package is the system itself, we log but allow
// install to proceed; we fail the install on all other permission
// redefinitions.
if (!bp.sourcePackage.equals("android")) {
res.setError(INSTALL_FAILED_DUPLICATE_PERMISSION, "Package "
+ pkg.packageName + " attempting to redeclare permission "
+ perm.info.name + " already owned by " + bp.sourcePackage);
res.origPermission = perm.info.name;
res.origPackage = bp.sourcePackage;
return;
} else {
Slog.w(TAG, "Package " + pkg.packageName
+ " attempting to redeclare system permission "
+ perm.info.name + "; ignoring new declaration");
pkg.permissions.remove(i);
}
}
}
}
}
if (systemApp && onExternal) {
// Disable updates to system apps on sdcard
res.setError(INSTALL_FAILED_INVALID_INSTALL_LOCATION,
"Cannot install updates to system apps on sdcard");
return;
}
if (args.move != null) {
// We did an in-place move, so dex is ready to roll
scanFlags |= SCAN_NO_DEX;
scanFlags |= SCAN_MOVE;
synchronized (mPackages) {
final PackageSetting ps = mSettings.mPackages.get(pkgName);
if (ps == null) {
res.setError(INSTALL_FAILED_INTERNAL_ERROR,
"Missing settings for moved package " + pkgName);
}
// We moved the entire application as-is, so bring over the
// previously derived ABI information.
pkg.applicationInfo.primaryCpuAbi = ps.primaryCpuAbiString;
pkg.applicationInfo.secondaryCpuAbi = ps.secondaryCpuAbiString;
}
} else if (!forwardLocked && !pkg.applicationInfo.isExternalAsec()) {
// Enable SCAN_NO_DEX flag to skip dexopt at a later stage
scanFlags |= SCAN_NO_DEX;
try {
derivePackageAbi(pkg, new File(pkg.codePath), args.abiOverride,
true /* extract libs */);
} catch (PackageManagerException pme) {
Slog.e(TAG, "Error deriving application ABI", pme);
res.setError(INSTALL_FAILED_INTERNAL_ERROR, "Error deriving application ABI");
return;
}
// Run dexopt before old package gets removed, to minimize time when app is unavailable
int result = mPackageDexOptimizer
.performDexOpt(pkg, null /* instruction sets */, false /* forceDex */,
false /* defer */, false /* inclDependencies */);
if (result == PackageDexOptimizer.DEX_OPT_FAILED) {
res.setError(INSTALL_FAILED_DEXOPT, "Dexopt failed for " + pkg.codePath);
return;
}
}
if (!args.doRename(res.returnCode, pkg, oldCodePath)) {
res.setError(INSTALL_FAILED_INSUFFICIENT_STORAGE, "Failed rename");
return;
}
startIntentFilterVerifications(args.user.getIdentifier(), replace, pkg);
if (replace) {
replacePackageLI(pkg, parseFlags, scanFlags | SCAN_REPLACING, args.user,
installerPackageName, volumeUuid, res);
} else {
installNewPackageLI(pkg, parseFlags, scanFlags | SCAN_DELETE_DATA_ON_FAILURES,
args.user, installerPackageName, volumeUuid, res);
}
synchronized (mPackages) {
final PackageSetting ps = mSettings.mPackages.get(pkgName);
if (ps != null) {
res.newUsers = ps.queryInstalledUsers(sUserManager.getUserIds(), true);
}
}
}主要是运行了下面操作：
1，初始一些參数 2，调用PackageParser来解析包 3，推断是否是当前已有应用升级还是全新安装。这两个都须要坚持签名
4。检測权限，检測新扫描的权限是否是已经定义的权限 5，依据条件是否进行derivePackageAbi操作，这个操作的凝视为Derive
the ABI of a non-system package located at {@code scanFile}. This
information is derived purely on the basis of the contents of {@code
scanFile} and{@code cpuAbiOverride}. 6，開始intent filter验证7，依据是否是已有应用进行升级还是全新安装运行不同的操作
这里重要的主要是第2点和第7点，可是因为这里主要讲述android过程，因此对第2点不做详述。之后来详细解释该内容。我们假设这里是全新安装着调用installNewPackageLI：
/*
* Install a non-existing package.
*/
private void installNewPackageLI(PackageParser.Package pkg, int parseFlags, int scanFlags,
UserHandle user, String installerPackageName, String volumeUuid,
PackageInstalledInfo res) {
// Remember this for later, in case we need to rollback this install
String pkgName = pkg.packageName;
if (DEBUG_INSTALL) Slog.d(TAG, "installNewPackageLI: " + pkg);
final boolean dataDirExists = Environment
.getDataUserPackageDirectory(volumeUuid, UserHandle.USER_OWNER, pkgName).exists();
...........
try {
PackageParser.Package newPackage = scanPackageLI(pkg, parseFlags, scanFlags,
System.currentTimeMillis(), user);
updateSettingsLI(newPackage, installerPackageName, volumeUuid, null, null, res, user);
// delete the partially installed application. the data directory will have to be
// restored if it was already existing
if (res.returnCode != PackageManager.INSTALL_SUCCEEDED) {
// remove package from internal structures. Note that we want deletePackageX to
// delete the package data and cache directories that it created in
// scanPackageLocked, unless those directories existed before we even tried to
// install.
deletePackageLI(pkgName, UserHandle.ALL, false, null, null,
dataDirExists ? PackageManager.DELETE_KEEP_DATA : 0,
res.removedInfo, true);
}
} catch (PackageManagerException e) {
res.setError("Package couldn‘t be installed in " + pkg.codePath, e);
}
}
主要是调用了scanPackageLI来进行包的安装，之后调用了updateSettingsLI，updateSettingsLI主要是更新了包的PackageSetting对象，主要更新了权限信息与安装完毕信息。这里我们继续查看scanPackageLI的运行：
private PackageParser.Package scanPackageLI(PackageParser.Package pkg, int parseFlags,
int scanFlags, long currentTime, UserHandle user) throws PackageManagerException {
boolean success = false;
try {
final PackageParser.Package res = scanPackageDirtyLI(pkg, parseFlags, scanFlags,
currentTime, user);
success = true;
return res;
} finally {
if (!success && (scanFlags & SCAN_DELETE_DATA_ON_FAILURES) != 0) {
removeDataDirsLI(pkg.volumeUuid, pkg.packageName);
}
}
}scanPackageLI主要调用了scanPackageDirtyLI，假设调用失败则调用removeDataDirsLI来移除安装信息。scanPackageDirtyLI的代码例如以下：
private PackageParser.Package scanPackageDirtyLI(PackageParser.Package pkg, int parseFlags,
int scanFlags, long currentTime, UserHandle user) throws PackageManagerException {
final File scanFile = new File(pkg.codePath);
............
if (pkg.packageName.equals("android")) {
.............
}
................
// Initialize package source and resource directories
File destCodeFile = new File(pkg.applicationInfo.getCodePath());
File destResourceFile = new File(pkg.applicationInfo.getResourcePath());
SharedUserSetting suid = null;
PackageSetting pkgSetting = null;
// writer
synchronized (mPackages) {
// Check if we are renaming from an original package name.
PackageSetting origPackage = null;
String realName = null;
if (pkg.mOriginalPackages != null) {
// This package may need to be renamed to a previously
// installed name. Let‘s check on that...
final String renamed = mSettings.mRenamedPackages.get(pkg.mRealPackage);
if (pkg.mOriginalPackages.contains(renamed)) {
// This package had originally been installed as the
// original name, and we have already taken care of
// transitioning to the new one. Just update the new
// one to continue using the old name.
realName = pkg.mRealPackage;
if (!pkg.packageName.equals(renamed)) {
// Callers into this function may have already taken
// care of renaming the package; only do it here if
// it is not already done.
pkg.setPackageName(renamed);
}
} else {
for (int i=pkg.mOriginalPackages.size()-1; i>=0; i--) {
if ((origPackage = mSettings.peekPackageLPr(
pkg.mOriginalPackages.get(i))) != null) {
// We do have the package already installed under its
// original name... should we use it?
if (!verifyPackageUpdateLPr(origPackage, pkg)) {
// New package is not compatible with original.
origPackage = null;
continue;
} else if (origPackage.sharedUser != null) {
// Make sure uid is compatible between packages.
if (!origPackage.sharedUser.name.equals(pkg.mSharedUserId)) {
Slog.w(TAG, "Unable to migrate data from " + origPackage.name
+ " to " + pkg.packageName + ": old uid "
+ origPackage.sharedUser.name
+ " differs from " + pkg.mSharedUserId);
origPackage = null;
continue;
}
} else {
if (DEBUG_UPGRADE) Log.v(TAG, "Renaming new package "
+ pkg.packageName + " to old name " + origPackage.name);
}
break;
}
}
}
}
.........
// Just create the setting, don‘t add it yet. For already existing packages
// the PkgSetting exists already and doesn‘t have to be created.
pkgSetting = mSettings.getPackageLPw(pkg, origPackage, realName, suid, destCodeFile,
destResourceFile, pkg.applicationInfo.nativeLibraryRootDir,
pkg.applicationInfo.primaryCpuAbi,
pkg.applicationInfo.secondaryCpuAbi,
pkg.applicationInfo.flags, pkg.applicationInfo.privateFlags,
user, false);
...............
if ((parseFlags&PackageParser.PARSE_IS_SYSTEM_DIR) == 0) {
// Check all shared libraries and map to their actual file path.
// We only do this here for apps not on a system dir, because those
// are the only ones that can fail an install due to this. We
// will take care of the system apps by updating all of their
// library paths after the scan is done.
updateSharedLibrariesLPw(pkg, null);
}
pkg.applicationInfo.uid = pkgSetting.appId;
pkg.mExtras = pkgSetting;
if (shouldCheckUpgradeKeySetLP(pkgSetting, scanFlags)) {
if (checkUpgradeKeySetLP(pkgSetting, pkg)) {
// We just determined the app is signed correctly, so bring
// over the latest parsed certs.
pkgSetting.signatures.mSignatures = pkg.mSignatures;
} else {
if ((parseFlags & PackageParser.PARSE_IS_SYSTEM_DIR) == 0) {
throw new PackageManagerException(INSTALL_FAILED_UPDATE_INCOMPATIBLE,
"Package " + pkg.packageName + " upgrade keys do not match the "
+ "previously installed version");
} else {
pkgSetting.signatures.mSignatures = pkg.mSignatures;
String msg = "System package " + pkg.packageName
+ " signature changed; retaining data.";
reportSettingsProblem(Log.WARN, msg);
}
}
} else {
try {
verifySignaturesLP(pkgSetting, pkg);
// We just determined the app is signed correctly, so bring
// over the latest parsed certs.
pkgSetting.signatures.mSignatures = pkg.mSignatures;
} catch (PackageManagerException e) {
}
}
// Verify that this new package doesn‘t have any content providers
// that conflict with existing packages. Only do this if the
// package isn‘t already installed, since we don‘t want to break
// things that are installed.
if ((scanFlags & SCAN_NEW_INSTALL) != 0) {
final int N = pkg.providers.size();
int i;
for (i=0; i<N; i++) {
PackageParser.Provider p = pkg.providers.get(i);
if (p.info.authority != null) {
String names[] = p.info.authority.split(";");
for (int j = 0; j < names.length; j++) {
if (mProvidersByAuthority.containsKey(names[j])) {
PackageParser.Provider other = mProvidersByAuthority.get(names[j]);
final String otherPackageName =
((other != null && other.getComponentName() != null) ?
other.getComponentName().getPackageName() : "?");
throw new PackageManagerException(
INSTALL_FAILED_CONFLICTING_PROVIDER,
"Can‘t install because provider name " + names[j]
+ " (in package " + pkg.applicationInfo.packageName
+ ") is already used by " + otherPackageName);
}
}
}
}
}
if (pkg.mAdoptPermissions != null) {
// This package wants to adopt ownership of permissions from
// another package.
for (int i = pkg.mAdoptPermissions.size() - 1; i >= 0; i--) {
final String origName = pkg.mAdoptPermissions.get(i);
final PackageSetting orig = mSettings.peekPackageLPr(origName);
if (orig != null) {
if (verifyPackageUpdateLPr(orig, pkg)) {
Slog.i(TAG, "Adopting permissions from " + origName + " to "
+ pkg.packageName);
mSettings.transferPermissionsLPw(origName, pkg.packageName);
}
}
}
}
}
..........
File dataPath;
if (mPlatformPackage == pkg) {
// The system package is special.
dataPath = new File(Environment.getDataDirectory(), "system");
pkg.applicationInfo.dataDir = dataPath.getPath();
} else {
// This is a normal package, need to make its data directory.
dataPath = Environment.getDataUserPackageDirectory(pkg.volumeUuid,
UserHandle.USER_OWNER, pkg.packageName);
boolean uidError = false;
if (dataPath.exists()) {
int currentUid = 0;
try {
StructStat stat = Os.stat(dataPath.getPath());
currentUid = stat.st_uid;
} catch (ErrnoException e) {
Slog.e(TAG, "Couldn‘t stat path " + dataPath.getPath(), e);
}
// If we have mismatched owners for the data path, we have a problem.
if (currentUid != pkg.applicationInfo.uid) {
boolean recovered = false;
if (currentUid == 0) {
// The directory somehow became owned by root. Wow.
// This is probably because the system was stopped while
// installd was in the middle of messing with its libs
// directory. Ask installd to fix that.
int ret = mInstaller.fixUid(pkg.volumeUuid, pkgName,
pkg.applicationInfo.uid, pkg.applicationInfo.uid);
if (ret >= 0) {
recovered = true;
String msg = "Package " + pkg.packageName
+ " unexpectedly changed to uid 0; recovered to " +
+ pkg.applicationInfo.uid;
reportSettingsProblem(Log.WARN, msg);
}
}
if (!recovered && ((parseFlags&PackageParser.PARSE_IS_SYSTEM) != 0
|| (scanFlags&SCAN_BOOTING) != 0)) {
// If this is a system app, we can at least delete its
// current data so the application will still work.
int ret = removeDataDirsLI(pkg.volumeUuid, pkgName);
if (ret >= 0) {
// TODO: Kill the processes first
// Old data gone!
String prefix = (parseFlags&PackageParser.PARSE_IS_SYSTEM) != 0
? "System package " : "Third party package ";
String msg = prefix + pkg.packageName
+ " has changed from uid: "
+ currentUid + " to "
+ pkg.applicationInfo.uid + "; old data erased";
reportSettingsProblem(Log.WARN, msg);
recovered = true;
// And now re-install the app.
ret = createDataDirsLI(pkg.volumeUuid, pkgName, pkg.applicationInfo.uid,
pkg.applicationInfo.seinfo);
if (ret == -1) {
// Ack should not happen!
msg = prefix + pkg.packageName
+ " could not have data directory re-created after delete.";
reportSettingsProblem(Log.WARN, msg);
throw new PackageManagerException(
INSTALL_FAILED_INSUFFICIENT_STORAGE, msg);
}
}
if (!recovered) {
mHasSystemUidErrors = true;
}
}
..............
}
pkg.applicationInfo.dataDir = dataPath.getPath();
if (mShouldRestoreconData) {
Slog.i(TAG, "SELinux relabeling of " + pkg.packageName + " issued.");
mInstaller.restoreconData(pkg.volumeUuid, pkg.packageName,
pkg.applicationInfo.seinfo, pkg.applicationInfo.uid);
}
} else {
if (DEBUG_PACKAGE_SCANNING) {
if ((parseFlags & PackageParser.PARSE_CHATTY) != 0)
Log.v(TAG, "Want this data dir: " + dataPath);
}
//invoke installer to do the actual installation
int ret = createDataDirsLI(pkg.volumeUuid, pkgName, pkg.applicationInfo.uid,
pkg.applicationInfo.seinfo);
..................
}
pkgSetting.uidError = uidError;
}
final String path = scanFile.getPath();
final String cpuAbiOverride = deriveAbiOverride(pkg.cpuAbiOverride, pkgSetting);
if ((scanFlags & SCAN_NEW_INSTALL) == 0) {
derivePackageAbi(pkg, scanFile, cpuAbiOverride, true /* extract libs */);
// Some system apps still use directory structure for native libraries
// in which case we might end up not detecting abi solely based on apk
// structure. Try to detect abi based on directory structure.
if (isSystemApp(pkg) && !pkg.isUpdatedSystemApp() &&
pkg.applicationInfo.primaryCpuAbi == null) {
setBundledAppAbisAndRoots(pkg, pkgSetting);
setNativeLibraryPaths(pkg);
}
} else {
// Set native library paths again. For moves, the path will be updated based on the
// ABIs we‘ve determined above. For non-moves, the path will be updated based on the
// ABIs we determined during compilation, but the path will depend on the final
// package path (after the rename away from the stage path).
setNativeLibraryPaths(pkg);
}
if (DEBUG_INSTALL) Slog.i(TAG, "Linking native library dir for " + path);
final int[] userIds = sUserManager.getUserIds();
synchronized (mInstallLock) {
// Make sure all user data directories are ready to roll; we‘re okay
// if they already exist
if (!TextUtils.isEmpty(pkg.volumeUuid)) {
for (int userId : userIds) {
if (userId != 0) {
mInstaller.createUserData(pkg.volumeUuid, pkg.packageName,
UserHandle.getUid(userId, pkg.applicationInfo.uid), userId,
pkg.applicationInfo.seinfo);
}
}
}
// Create a native library symlink only if we have native libraries
// and if the native libraries are 32 bit libraries. We do not provide
// this symlink for 64 bit libraries.
if (pkg.applicationInfo.primaryCpuAbi != null &&
!VMRuntime.is64BitAbi(pkg.applicationInfo.primaryCpuAbi)) {
final String nativeLibPath = pkg.applicationInfo.nativeLibraryDir;
for (int userId : userIds) {
if (mInstaller.linkNativeLibraryDirectory(pkg.volumeUuid, pkg.packageName,
nativeLibPath, userId) < 0) {
throw new PackageManagerException(INSTALL_FAILED_INTERNAL_ERROR,
"Failed linking native library dir (user=" + userId + ")");
}
}
}
}
.............
ArrayList<PackageParser.Package> clientLibPkgs = null;
// We also need to dexopt any apps that are dependent on this library. Note that
// if these fail, we should abort the install since installing the library will
// result in some apps being broken.
if (clientLibPkgs != null) {
if ((scanFlags & SCAN_NO_DEX) == 0) {
for (int i = 0; i < clientLibPkgs.size(); i++) {
PackageParser.Package clientPkg = clientLibPkgs.get(i);
int result = mPackageDexOptimizer.performDexOpt(clientPkg,
null /* instruction sets */, forceDex,
(scanFlags & SCAN_DEFER_DEX) != 0, false);
if (result == PackageDexOptimizer.DEX_OPT_FAILED) {
throw new PackageManagerException(INSTALL_FAILED_DEXOPT,
"scanPackageLI failed to dexopt clientLibPkgs");
}
}
}
}
// Request the ActivityManager to kill the process(only for existing packages)
// so that we do not end up in a confused state while the user is still using the older
// version of the application while the new one gets installed.
if ((scanFlags & SCAN_REPLACING) != 0) {
killApplication(pkg.applicationInfo.packageName,
pkg.applicationInfo.uid, "replace pkg");
}
// Also need to kill any apps that are dependent on the library.
if (clientLibPkgs != null) {
for (int i=0; i<clientLibPkgs.size(); i++) {
PackageParser.Package clientPkg = clientLibPkgs.get(i);
killApplication(clientPkg.applicationInfo.packageName,
clientPkg.applicationInfo.uid, "update lib");
}
}
// Make sure we‘re not adding any bogus keyset info
KeySetManagerService ksms = mSettings.mKeySetManagerService;
ksms.assertScannedPackageValid(pkg);
// writer
synchronized (mPackages) {
// We don‘t expect installation to fail beyond this point
// Add the package‘s KeySets to the global KeySetManagerService
ksms.addScannedPackageLPw(pkg);
int N = pkg.providers.size();
StringBuilder r = null;
int i;
for (i=0; i<N; i++) {
PackageParser.Provider p = pkg.providers.get(i);
p.info.processName = fixProcessName(pkg.applicationInfo.processName,
p.info.processName, pkg.applicationInfo.uid);
mProviders.addProvider(p);
p.syncable = p.info.isSyncable;
if (p.info.authority != null) {
String names[] = p.info.authority.split(";");
p.info.authority = null;
for (int j = 0; j < names.length; j++) {
if (j == 1 && p.syncable) {
// We only want the first authority for a provider to possibly be
// syncable, so if we already added this provider using a different
// authority clear the syncable flag. We copy the provider before
// changing it because the mProviders object contains a reference
// to a provider that we don‘t want to change.
// Only do this for the second authority since the resulting provider
// object can be the same for all future authorities for this provider.
p = new PackageParser.Provider(p);
p.syncable = false;
}
if (!mProvidersByAuthority.containsKey(names[j])) {
mProvidersByAuthority.put(names[j], p);
if (p.info.authority == null) {
p.info.authority = names[j];
} else {
p.info.authority = p.info.authority + ";" + names[j];
}
if (DEBUG_PACKAGE_SCANNING) {
if ((parseFlags & PackageParser.PARSE_CHATTY) != 0)
Log.d(TAG, "Registered content provider: " + names[j]
+ ", className = " + p.info.name + ", isSyncable = "
+ p.info.isSyncable);
}
} else {
PackageParser.Provider other = mProvidersByAuthority.get(names[j]);
Slog.w(TAG, "Skipping provider name " + names[j] +
" (in package " + pkg.applicationInfo.packageName +
"): name already used by "
+ ((other != null && other.getComponentName() != null)
? other.getComponentName().getPackageName() : "?"));
}
}
}
if ((parseFlags&PackageParser.PARSE_CHATTY) != 0) {
if (r == null) {
r = new StringBuilder(256);
} else {
r.append(‘ ‘);
}
r.append(p.info.name);
}
}
if (r != null) {
if (DEBUG_PACKAGE_SCANNING) Log.d(TAG, " Providers: " + r);
}
N = pkg.services.size();
r = null;
for (i=0; i<N; i++) {
PackageParser.Service s = pkg.services.get(i);
s.info.processName = fixProcessName(pkg.applicationInfo.processName,
s.info.processName, pkg.applicationInfo.uid);
mServices.addService(s);
if ((parseFlags&PackageParser.PARSE_CHATTY) != 0) {
if (r == null) {
r = new StringBuilder(256);
} else {
r.append(‘ ‘);
}
r.append(s.info.name);
}
}
if (r != null) {
if (DEBUG_PACKAGE_SCANNING) Log.d(TAG, " Services: " + r);
}
N = pkg.receivers.size();
r = null;
for (i=0; i<N; i++) {
PackageParser.Activity a = pkg.receivers.get(i);
a.info.processName = fixProcessName(pkg.applicationInfo.processName,
a.info.processName, pkg.applicationInfo.uid);
mReceivers.addActivity(a, "receiver");
if ((parseFlags&PackageParser.PARSE_CHATTY) != 0) {
if (r == null) {
r = new StringBuilder(256);
} else {
r.append(‘ ‘);
}
r.append(a.info.name);
}
}
if (r != null) {
if (DEBUG_PACKAGE_SCANNING) Log.d(TAG, " Receivers: " + r);
}
N = pkg.activities.size();
r = null;
for (i=0; i<N; i++) {
PackageParser.Activity a = pkg.activities.get(i);
a.info.processName = fixProcessName(pkg.applicationInfo.processName,
a.info.processName, pkg.applicationInfo.uid);
mActivities.addActivity(a, "activity");
if ((parseFlags&PackageParser.PARSE_CHATTY) != 0) {
if (r == null) {
r = new StringBuilder(256);
} else {
r.append(‘ ‘);
}
r.append(a.info.name);
}
}
if (r != null) {
if (DEBUG_PACKAGE_SCANNING) Log.d(TAG, " Activities: " + r);
}
N = pkg.permissionGroups.size();
r = null;
for (i=0; i<N; i++) {
PackageParser.PermissionGroup pg = pkg.permissionGroups.get(i);
PackageParser.PermissionGroup cur = mPermissionGroups.get(pg.info.name);
if (cur == null) {
mPermissionGroups.put(pg.info.name, pg);
if ((parseFlags&PackageParser.PARSE_CHATTY) != 0) {
if (r == null) {
r = new StringBuilder(256);
} else {
r.append(‘ ‘);
}
r.append(pg.info.name);
}
} else {
Slog.w(TAG, "Permission group " + pg.info.name + " from package "
+ pg.info.packageName + " ignored: original from "
+ cur.info.packageName);
if ((parseFlags&PackageParser.PARSE_CHATTY) != 0) {
if (r == null) {
r = new StringBuilder(256);
} else {
r.append(‘ ‘);
}
r.append("DUP:");
r.append(pg.info.name);
}
}
}
if (r != null) {
if (DEBUG_PACKAGE_SCANNING) Log.d(TAG, " Permission Groups: " + r);
}
N = pkg.permissions.size();
r = null;
for (i=0; i<N; i++) {
PackageParser.Permission p = pkg.permissions.get(i);
// Assume by default that we did not install this permission into the system.
p.info.flags &= ~PermissionInfo.FLAG_INSTALLED;
// Now that permission groups have a special meaning, we ignore permission
// groups for legacy apps to prevent unexpected behavior. In particular,
// permissions for one app being granted to someone just becuase they happen
// to be in a group defined by another app (before this had no implications).
if (pkg.applicationInfo.targetSdkVersion > Build.VERSION_CODES.LOLLIPOP_MR1) {
p.group = mPermissionGroups.get(p.info.group);
// Warn for a permission in an unknown group.
if (p.info.group != null && p.group == null) {
Slog.w(TAG, "Permission " + p.info.name + " from package "
+ p.info.packageName + " in an unknown group " + p.info.group);
}
}
ArrayMap<String, BasePermission> permissionMap =
p.tree ? mSettings.mPermissionTrees
: mSettings.mPermissions;
BasePermission bp = permissionMap.get(p.info.name);
// Allow system apps to redefine non-system permissions
if (bp != null && !Objects.equals(bp.sourcePackage, p.info.packageName)) {
final boolean currentOwnerIsSystem = (bp.perm != null
&& isSystemApp(bp.perm.owner));
if (isSystemApp(p.owner)) {
if (bp.type == BasePermission.TYPE_BUILTIN && bp.perm == null) {
// It‘s a built-in permission and no owner, take ownership now
bp.packageSetting = pkgSetting;
bp.perm = p;
bp.uid = pkg.applicationInfo.uid;
bp.sourcePackage = p.info.packageName;
p.info.flags |= PermissionInfo.FLAG_INSTALLED;
} else if (!currentOwnerIsSystem) {
String msg = "New decl " + p.owner + " of permission "
+ p.info.name + " is system; overriding " + bp.sourcePackage;
reportSettingsProblem(Log.WARN, msg);
bp = null;
}
}
}
if (bp == null) {
bp = new BasePermission(p.info.name, p.info.packageName,
BasePermission.TYPE_NORMAL);
permissionMap.put(p.info.name, bp);
}
if (bp.perm == null) {
if (bp.sourcePackage == null
|| bp.sourcePackage.equals(p.info.packageName)) {
BasePermission tree = findPermissionTreeLP(p.info.name);
if (tree == null
|| tree.sourcePackage.equals(p.info.packageName)) {
bp.packageSetting = pkgSetting;
bp.perm = p;
bp.uid = pkg.applicationInfo.uid;
bp.sourcePackage = p.info.packageName;
p.info.flags |= PermissionInfo.FLAG_INSTALLED;
if ((parseFlags&PackageParser.PARSE_CHATTY) != 0) {
if (r == null) {
r = new StringBuilder(256);
} else {
r.append(‘ ‘);
}
r.append(p.info.name);
}
} else {
Slog.w(TAG, "Permission " + p.info.name + " from package "
+ p.info.packageName + " ignored: base tree "
+ tree.name + " is from package "
+ tree.sourcePackage);
}
} else {
Slog.w(TAG, "Permission " + p.info.name + " from package "
+ p.info.packageName + " ignored: original from "
+ bp.sourcePackage);
}
} else if ((parseFlags&PackageParser.PARSE_CHATTY) != 0) {
if (r == null) {
r = new StringBuilder(256);
} else {
r.append(‘ ‘);
}
r.append("DUP:");
r.append(p.info.name);
}
if (bp.perm == p) {
bp.protectionLevel = p.info.protectionLevel;
}
}
if (r != null) {
if (DEBUG_PACKAGE_SCANNING) Log.d(TAG, " Permissions: " + r);
}
N = pkg.instrumentation.size();
r = null;
for (i=0; i<N; i++) {
PackageParser.Instrumentation a = pkg.instrumentation.get(i);
a.info.packageName = pkg.applicationInfo.packageName;
a.info.sourceDir = pkg.applicationInfo.sourceDir;
a.info.publicSourceDir = pkg.applicationInfo.publicSourceDir;
a.info.splitSourceDirs = pkg.applicationInfo.splitSourceDirs;
a.info.splitPublicSourceDirs = pkg.applicationInfo.splitPublicSourceDirs;
a.info.dataDir = pkg.applicationInfo.dataDir;
// TODO: Update instrumentation.nativeLibraryDir as well ? Does it
// need other information about the application, like the ABI and what not ?
a.info.nativeLibraryDir = pkg.applicationInfo.nativeLibraryDir;
mInstrumentation.put(a.getComponentName(), a);
if ((parseFlags&PackageParser.PARSE_CHATTY) != 0) {
if (r == null) {
r = new StringBuilder(256);
} else {
r.append(‘ ‘);
}
r.append(a.info.name);
}
}
if (r != null) {
if (DEBUG_PACKAGE_SCANNING) Log.d(TAG, " Instrumentation: " + r);
}
if (pkg.protectedBroadcasts != null) {
N = pkg.protectedBroadcasts.size();
for (i=0; i<N; i++) {
mProtectedBroadcasts.add(pkg.protectedBroadcasts.get(i));
}
}
...............
}
return pkg;
}这里主要做了下面操作：
1，检測路径代码路径是否存在不存在抛出异常
2，设置Package的applicationInfo信息
3。设置ResolverActivity信息
4，假设是系统程序则更改ResolverActivity信息
5，假设我们仅仅安装以及存在的包，则推断他的PackageSetting信息，假设路径不一致，測抛出异常
6，初始化包的代码与资源文件夹
7。检測我们是否须要重命名一个原始包
8。检測全部共享的libraries而且映射到真实的路径
9，如个是升级包则检測签名，假设新安装包则验证签名
10。检測新包不含有与已经存在包冲突的provider
11，检測当前包对于其它包所拥有的权限
12，创建包data文件夹。而且又一次调整uid。调用createDataDirsLI进行包的安装
13，设置包的本地的Library路径
14。创建包的用户数据。调用createUserData
15，对包进行opt操作，调用performDexOpt，终于调用的还是Install的dexopt函数
16。假设是已存在的包。则调用ActivityManager杀死该进程
17。解析包的provider，并加入到ProviderIntentResolver，解析包的service，并加入到ServiceIntentResolver，解析包的receiver，并加入到ActivityIntentResolver，解析包的activity，并加入到ActivityIntentResolver，解析包的权利组与权限。最后解析instrumentation这个是測试用的，上述的解析主要是为了在应用中调用getPackageManager().resolveActivity等方法使用的。
上面主要是调用了createDataDirsLI来进行包的安装：
private int createDataDirsLI(String volumeUuid, String packageName, int uid, String seinfo) {
int[] users = sUserManager.getUserIds();
int res = mInstaller.install(volumeUuid, packageName, uid, uid, seinfo);
if (res < 0) {
return res;
}
for (int user : users) {
if (user != 0) {
res = mInstaller.createUserData(volumeUuid, packageName,
UserHandle.getUid(user, uid), user, seinfo);
if (res < 0) {
return res;
}
}
}
return res;
}这里终于调用了mInstaller的intall函数，mInstaller是一个InstallerConnection，InstallerConnection里面是通过输入输出流与一个LocalSocket进行安装操作的，所以这里终于调用的InstallerConnection的intall函数，运行完毕后假设user不为空，创建用户数据。
包的安装过程到此就结束了，我们再回头看看POST_INSTALL进行了什么操作？
case POST_INSTALL: {
if (DEBUG_INSTALL) Log.v(TAG, "Handling post-install for " + msg.arg1);
PostInstallData data = mRunningInstalls.get(msg.arg1);
mRunningInstalls.delete(msg.arg1);
boolean deleteOld = false;
if (data != null) {
InstallArgs args = data.args;
PackageInstalledInfo res = data.res;
if (res.returnCode == PackageManager.INSTALL_SUCCEEDED) {
final String packageName = res.pkg.applicationInfo.packageName;
res.removedInfo.sendBroadcast(false, true, false);
Bundle extras = new Bundle(1);
extras.putInt(Intent.EXTRA_UID, res.uid);
// Now that we successfully installed the package, grant runtime
// permissions if requested before broadcasting the install.
if ((args.installFlags
& PackageManager.INSTALL_GRANT_RUNTIME_PERMISSIONS) != 0) {
grantRequestedRuntimePermissions(res.pkg, args.user.getIdentifier(),
args.installGrantPermissions);
}
// Determine the set of users who are adding this
// package for the first time vs. those who are seeing
// an update.
int[] firstUsers;
int[] updateUsers = new int[0];
if (res.origUsers == null || res.origUsers.length == 0) {
firstUsers = res.newUsers;
} else {
firstUsers = new int[0];
for (int i=0; i<res.newUsers.length; i++) {
int user = res.newUsers[i];
boolean isNew = true;
for (int j=0; j<res.origUsers.length; j++) {
if (res.origUsers[j] == user) {
isNew = false;
break;
}
}
if (isNew) {
int[] newFirst = new int[firstUsers.length+1];
System.arraycopy(firstUsers, 0, newFirst, 0,
firstUsers.length);
newFirst[firstUsers.length] = user;
firstUsers = newFirst;
} else {
int[] newUpdate = new int[updateUsers.length+1];
System.arraycopy(updateUsers, 0, newUpdate, 0,
updateUsers.length);
newUpdate[updateUsers.length] = user;
updateUsers = newUpdate;
}
}
}
sendPackageBroadcast(Intent.ACTION_PACKAGE_ADDED,
packageName, extras, null, null, firstUsers);
final boolean update = res.removedInfo.removedPackage != null;
if (update) {
extras.putBoolean(Intent.EXTRA_REPLACING, true);
}
sendPackageBroadcast(Intent.ACTION_PACKAGE_ADDED,
packageName, extras, null, null, updateUsers);
if (update) {
sendPackageBroadcast(Intent.ACTION_PACKAGE_REPLACED,
packageName, extras, null, null, updateUsers);
sendPackageBroadcast(Intent.ACTION_MY_PACKAGE_REPLACED,
null, null, packageName, null, updateUsers);
// treat asec-hosted packages like removable media on upgrade
if (res.pkg.isForwardLocked() || isExternal(res.pkg)) {
if (DEBUG_INSTALL) {
Slog.i(TAG, "upgrading pkg " + res.pkg
+ " is ASEC-hosted -> AVAILABLE");
}
int[] uidArray = new int[] { res.pkg.applicationInfo.uid };
ArrayList<String> pkgList = new ArrayList<String>(1);
pkgList.add(packageName);
sendResourcesChangedBroadcast(true, true,
pkgList,uidArray, null);
}
}
if (res.removedInfo.args != null) {
// Remove the replaced package‘s older resources safely now
deleteOld = true;
}
// If this app is a browser and it‘s newly-installed for some
// users, clear any default-browser state in those users
if (firstUsers.length > 0) {
// the app‘s nature doesn‘t depend on the user, so we can just
// check its browser nature in any user and generalize.
if (packageIsBrowser(packageName, firstUsers[0])) {
synchronized (mPackages) {
for (int userId : firstUsers) {
mSettings.setDefaultBrowserPackageNameLPw(null, userId);
}
}
}
}
// Log current value of "unknown sources" setting
EventLog.writeEvent(EventLogTags.UNKNOWN_SOURCES_ENABLED,
getUnknownSourcesSettings());
}
// Force a gc to clear up things
Runtime.getRuntime().gc();
// We delete after a gc for applications on sdcard.
if (deleteOld) {
synchronized (mInstallLock) {
res.removedInfo.args.doPostDeleteLI(true);
}
}
if (args.observer != null) {
try {
Bundle extras = extrasForInstallResult(res);
args.observer.onPackageInstalled(res.name, res.returnCode,
res.returnMsg, extras);
} catch (RemoteException e) {
Slog.i(TAG, "Observer no longer exists.");
}
}
} else {
Slog.e(TAG, "Bogus post-install token " + msg.arg1);
}
} break;万里长征最后一步，这里主要先将安装信息从安装列表中移除，这也是在之前processPendingInstall中加入的。包成功安装之后，在发送成功安装广播之前先获取运行时权限，获取权限后发送ACTION_PACKAGE_ADDED广播。假设是更新包再发送ACTION_PACKAGE_REPLACED和ACTION_MY_PACKAGE_REPLACED广播来通知其它应用，安装的广播发送完毕后发送一个资源更改的广播通知其它应用。假设该应用是一个浏览器，则先清除默认的浏览器设置。又一次检查浏览器设置。
上诉几步调用完毕之后。强制调用gc，来触发jvm进行垃圾回收操作。
gc调用后删除旧的安装信息，假设初始传入的IPackageInstallObserver2不为空，这回调调用方安装包安装完毕。
总结
到此大致分析了整个安装过程，还有非常多细节能够分析，比方parsePackage，之后能够再进行解析。整篇文章可能有理解错误的地方。望指出。
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