Android Apk安装过程分析
本文以android 8.0（API Level:26） 源码讲解apk安装过程
APk安装主要步骤
- copy apk到data/app目录下
- 解析apk信息
- 更新权限信息
- 发送安装广播
一.将apk文件copy至data/app目录
安装过程是从调用ApplicationPackageManager.install()方法开始
1.1 ApplicationPackageManager.installCommon
#ApplicationPackageManager
protected ApplicationPackageManager(ContextImpl context,IPackageManager pm) {
mContext = context;
mPM = pm;
}
private void installCommon(Uri packageURI,
PackageInstallObserver observer, int flags, String installerPackageName,
int userId) {
if (!"file".equals(packageURI.getScheme())) {
throw new UnsupportedOperationException("Only file:// URIs are supported");
}
final String originPath = packageURI.getPath();
try {
mPM.installPackageAsUser(originPath, observer.getBinder(), flags, installerPackageName,
userId);
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
内部是调用mPm.installPackageAsUser方法,这里的Pm其实就是PackageManagerService对象
1.2. installPackageAsUser 发送INIT_COPY广播
#PackageManagerService
@Override
public void installPackageAsUser(String originPath, IPackageInstallObserver2 observer,
int installFlags, String installerPackageName, int userId) {
final int callingUid = Binder.getCallingUid();
enforceCrossUserPermission(callingUid, userId,
true /* requireFullPermission */, true /* checkShell */, "installPackageAsUser");
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");
}
if ((installFlags & PackageManager.INSTALL_FORWARD_LOCK) != 0
|| (installFlags & PackageManager.INSTALL_EXTERNAL) != 0) {
throw new IllegalArgumentException(
"New installs into ASEC containers no longer supported");
}
final File originFile = new File(originPath);
final OriginInfo origin = OriginInfo.fromUntrustedFile(originFile);
// 构建INIT_COPY的Message
final Message msg = mHandler.obtainMessage(INIT_COPY);
final VerificationInfo verificationInfo = new VerificationInfo(
null /*originatingUri*/, null /*referrer*/, -1 /*originatingUid*/, callingUid);
final InstallParams params = new InstallParams(origin, null /*moveInfo*/, observer,
installFlags, installerPackageName, null /*volumeUuid*/, verificationInfo, user,
null /*packageAbiOverride*/, null /*grantedPermissions*/,
null /*certificates*/, PackageManager.INSTALL_REASON_UNKNOWN);
params.setTraceMethod("installAsUser").setTraceCookie(System.identityHashCode(params));
msg.obj = params;
mHandler.sendMessage(msg);
这里主要判断安装来源是属于adb、shell还是All_User,然后用mHandler发送INIT_COPY的消息
1.3 处理INIT_COPY和MCS_BOUND
#PackageHandler
class PackageHandler extends Handler {
private boolean mBound = false;
final ArrayList mPendingInstalls =
new ArrayList();
PackageHandler(Looper looper) {
super(looper);
}
public void handleMessage(Message msg) {
try {
doHandleMessage(msg);
} finally {
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
}
}
void doHandleMessage(Message msg) {
switch (msg.what) {
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) {
Trace.asyncTraceBegin(TRACE_TAG_PACKAGE_MANAGER, "bindingMCS",
System.identityHashCode(mHandler));
// 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();
Trace.asyncTraceEnd(TRACE_TAG_PACKAGE_MANAGER, "bindingMCS",
System.identityHashCode(mHandler));
if (params.traceMethod != null) {
Trace.asyncTraceEnd(TRACE_TAG_PACKAGE_MANAGER, params.traceMethod,
params.traceCookie);
}
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;
}
}
case MCS_BOUND: {
if (DEBUG_INSTALL) Slog.i(TAG, "mcs_bound");
if (msg.obj != null) {
mContainerService = (IMediaContainerService) msg.obj;
Trace.asyncTraceEnd(TRACE_TAG_PACKAGE_MANAGER, "bindingMCS",
System.identityHashCode(mHandler));
}
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();
Trace.asyncTraceEnd(TRACE_TAG_PACKAGE_MANAGER, "queueInstall",
System.identityHashCode(params));
if (params.traceMethod != null) {
Trace.asyncTraceEnd(TRACE_TAG_PACKAGE_MANAGER,
params.traceMethod, params.traceCookie);
}
return;
}
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) {
Trace.asyncTraceEnd(TRACE_TAG_PACKAGE_MANAGER, "queueInstall",
System.identityHashCode(params));
Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "startCopy");
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);
}
}
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
}
} else {
// Should never happen ideally.
Slog.w(TAG, "Empty queue");
}
break;
}
在INIT_COPYz这个case中主要是确保DefaultContainerService已bound,DefaultContainerService是一个应用服务，具体负责实现APK等相关资源文件在内部或外部存储器上的存储工作， 然后发送MCS_BOUND的消息，在MCS_BOUND这个case中 最关键的代码就是
params.startCopy()
1.4 HandlerParams.startCopy()
# HandlerParams
private abstract class HandlerParams {
private static final int MAX_RETRIES = 4;
private int mRetries = 0;
/** User handle for the user requesting the information or installation. */
private final UserHandle mUser;
String traceMethod;
int traceCookie;
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;
}
final void serviceError() {
if (DEBUG_INSTALL) Slog.i(TAG, "serviceError");
handleServiceError();
handleReturnCode();
}
abstract void handleStartCopy() throws RemoteException;
abstract void handleServiceError();
abstract void handleReturnCode();
}
这里是直接调用 handleStartCopy()
int ret = PackageManager.INSTALL_SUCCEEDED;
...
...
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) {
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(sizeBytes + lowThreshold) >= 0) {
pkgLite = mContainerService.getMinimalPackageInfo(origin.resolvedPath,
installFlags, packageAbiOverride);
}
}
}
...
...
* No package verification is enabled, so immediately start
* the remote call to initiate copy using temporary file.
*/
ret = args.copyApk(mContainerService, true);
}
mRet = ret;
}
handleStartCopy的核心是InstallArgs的copyApk()，其他的都是些存储空间检查,权限检查等等安全校验， copyApk方法会把apk copy到data/app目录下
1.6 FileInstallArgs#copyApk
class FileInstallArgs extends InstallArgs {
int copyApk(IMediaContainerService imcs, boolean temp) throws RemoteException {
Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "copyApk");
try {
return doCopyApk(imcs, temp);
} finally {
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
}
}
}
private int doCopyApk(IMediaContainerService imcs, boolean temp) throws RemoteException {
if (origin.staged) {
if (DEBUG_INSTALL) Slog.d(TAG, origin.file + " already staged; skipping copy");
codeFile = origin.file;
resourceFile = origin.file;
return PackageManager.INSTALL_SUCCEEDED;
}
try {
final boolean isEphemeral = (installFlags & PackageManager.INSTALL_INSTANT_APP) != 0;
final File tempDir =
mInstallerService.allocateStageDirLegacy(volumeUuid, isEphemeral);
codeFile = tempDir;
resourceFile = tempDir;
} catch (IOException e) {
Slog.w(TAG, "Failed to create copy file: " + e);
return PackageManager.INSTALL_FAILED_INSUFFICIENT_STORAGE;
}
final IParcelFileDescriptorFactory target = new IParcelFileDescriptorFactory.Stub() {
@Override
public ParcelFileDescriptor open(String name, int mode) throws RemoteException {
if (!FileUtils.isValidExtFilename(name)) {
throw new IllegalArgumentException("Invalid filename: " + name);
}
try {
final File file = new File(codeFile, name);
final FileDescriptor fd = Os.open(file.getAbsolutePath(),
O_RDWR | O_CREAT, 0644);
Os.chmod(file.getAbsolutePath(), 0644);
return new ParcelFileDescriptor(fd);
} catch (ErrnoException e) {
throw new RemoteException("Failed to open: " + e.getMessage());
}
}
};
int ret = PackageManager.INSTALL_SUCCEEDED;
ret = imcs.copyPackage(origin.file.getAbsolutePath(), target);
if (ret != PackageManager.INSTALL_SUCCEEDED) {
Slog.e(TAG, "Failed to copy package");
return ret;
}
final File libraryRoot = new File(codeFile, LIB_DIR_NAME);
NativeLibraryHelper.Handle handle = null;
try {
handle = NativeLibraryHelper.Handle.create(codeFile);
ret = NativeLibraryHelper.copyNativeBinariesWithOverride(handle, libraryRoot,
abiOverride);
} catch (IOException e) {
Slog.e(TAG, "Copying native libraries failed", e);
ret = PackageManager.INSTALL_FAILED_INTERNAL_ERROR;
} finally {
IoUtils.closeQuietly(handle);
}
return ret;
}
1.7 startCopy
final boolean startCopy() {
boolean res;
try {
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;
}
解析apk信息
在执行完拷贝apk的操作后，执行handleReturnCode(),该方法的作用是解析apk
2.1 handleReturnCode
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);
}
}
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); //1.安装
}
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 {
bm.restoreAtInstall(res.pkg.applicationInfo.packageName, token); //2.调用backup服务
} 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);
}
}
});}
这里有几个关键步骤
1.installPackageLI(args, res); 解析Package和后续操作
2.bm.restoreAtInstall(res.pkg.applicationInfo.packageName, token);
我们先看installPackageLI(args, res)方法
2.2
private void installPackageLI(InstallArgs args, PackageInstalledInfo res) {
final int installFlags = args.installFlags;
String installerPackageName = args.installerPackageName;
File tmpPackageFile = new File(args.getCodePath());
boolean forwardLocked = ((installFlags & PackageManager.INSTALL_FORWARD_LOCK) != 0);
boolean onSd = ((installFlags & PackageManager.INSTALL_EXTERNAL) != 0);
boolean replace = false;
final int scanFlags = SCAN_NEW_INSTALL | SCAN_FORCE_DEX | SCAN_UPDATE_SIGNATURE;
// Result object to be returned
res.returnCode = PackageManager.INSTALL_SUCCEEDED;
if (DEBUG_INSTALL) Slog.d(TAG, "installPackageLI: path=" + tmpPackageFile);
// Retrieve PackageSettings and parse package
final int parseFlags = mDefParseFlags | PackageParser.PARSE_CHATTY
| (forwardLocked ? PackageParser.PARSE_FORWARD_LOCK : 0)
| (onSd ? PackageParser.PARSE_ON_SDCARD : 0);
PackageParser pp = new PackageParser();
pp.setSeparateProcesses(mSeparateProcesses);
pp.setDisplayMetrics(mMetrics);
final PackageParser.Package pkg;
try {
//解析包信息，将解析结果存放到PackageParser.Package中
pkg = pp.parsePackage(tmpPackageFile, parseFlags);
} catch (PackageParserException e) {
res.setError("Failed parse during installPackageLI", e);
return;
}
// Mark that we have an install time CPU ABI override.
pkg.cpuAbiOverride = args.abiOverride;
String pkgName = res.name = pkg.packageName;
try {
pp.collectCertificates(pkg, parseFlags);
pp.collectManifestDigest(pkg);
} catch (PackageParserException e) {
res.setError("Failed collect during installPackageLI", e);
return;
}
pp = null;
String oldCodePath = null;
boolean systemApp = false;
//校验自定义权限：APP含有一个或多个相同自定义权限，签名不一致无法正常安装
synchronized (mPackages) {
// 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)
|| !bp.packageSetting.keySetData.isUsingUpgradeKeySets()
|| ((PackageSetting) bp.packageSetting).sharedUser != null) {
sigsOk = compareSignatures(bp.packageSetting.signatures.mSignatures,
pkg.mSignatures) == PackageManager.SIGNATURE_MATCH;
} else {
sigsOk = checkUpgradeKeySetLP((PackageSetting) bp.packageSetting, pkg);
}
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.
//如果是非android系统app则直接拦截，系统应用的话则允许安装但是移除该权限
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);
}
}
}
}
// 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);
}
}
PackageSetting ps = mSettings.mPackages.get(pkgName);
if (ps != null) {
if (DEBUG_INSTALL) Slog.d(TAG, "Existing package: " + ps);
oldCodePath = mSettings.mPackages.get(pkgName).codePathString;
if (ps.pkg != null && ps.pkg.applicationInfo != null) {
systemApp = (ps.pkg.applicationInfo.flags &
ApplicationInfo.FLAG_SYSTEM) != 0;
}
res.origUsers = ps.queryInstalledUsers(sUserManager.getUserIds(), true);
}
}
if (replace) {
replacePackageLI(pkg, parseFlags, scanFlags | SCAN_REPLACING, args.user,
installerPackageName, res);
} else {
installNewPackageLI(pkg, parseFlags, scanFlags | SCAN_DELETE_DATA_ON_FAILURES,
args.user, installerPackageName, res);
}
synchronized (mPackages) {
final PackageSetting ps = mSettings.mPackages.get(pkgName);
if (ps != null) {
res.newUsers = ps.queryInstalledUsers(sUserManager.getUserIds(), true);
}
}
}
这个方法先是解析了package包,然后做了大量签名和权限校验的工作,最终会走到
2.2
if (replace) {
replacePackageLI(pkg, parseFlags, scanFlags | SCAN_REPLACING, args.user,
installerPackageName, res);
} else {
installNewPackageLI(pkg, parseFlags, scanFlags | SCAN_DELETE_DATA_ON_FAILURES,
args.user, installerPackageName, res);
}
if (replace) {
replacePackageLI(pkg, parseFlags, scanFlags | SCAN_REPLACING, args.user,
installerPackageName, res);
} else {
installNewPackageLI(pkg, parseFlags, scanFlags | SCAN_DELETE_DATA_ON_FAILURES,
args.user, installerPackageName, res);
}
根据是首次安装还是非首次安装,如果是首次安装,执行installNewPackageLI（），非首次安装，执行replacePackageLI(),
这里我们先看首次安装的情况
2.3 installNewPackageLI
private void installNewPackageLI(PackageParser.Package pkg,
int parseFlags, int scanFlags, UserHandle user,
String installerPackageName, 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);
boolean dataDirExists = getDataPathForPackage(pkg.packageName, 0).exists();
synchronized(mPackages) {
if (mSettings.mRenamedPackages.containsKey(pkgName)) {
// A package with the same name is already installed, though
// it has been renamed to an older name. The package we
// are trying to install should be installed as an update to
// the existing one, but that has not been requested, so bail.
res.setError(INSTALL_FAILED_ALREADY_EXISTS, "Attempt to re-install " + pkgName
+ " without first uninstalling package running as "
+ mSettings.mRenamedPackages.get(pkgName));
return;
}
if (mPackages.containsKey(pkgName)) {
// Don't allow installation over an existing package with the same name.
res.setError(INSTALL_FAILED_ALREADY_EXISTS, "Attempt to re-install " + pkgName
+ " without first uninstalling.");
return;
}
}
try {
PackageParser.Package newPackage = scanPackageLI(pkg, parseFlags, scanFlags,
System.currentTimeMillis(), user);
updateSettingsLI(newPackage, installerPackageName, null, null, res);
// 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);
}
}
这个方法主要做了两件事
- scanPackageLI(pkg, parseFlags, scanFlags,
System.currentTimeMillis(), user) - updateSettingsLI(newPackage, installerPackageName
scanPackageLI 负责安装，updateSettingsLI负责安装完成后的设置信息更新
2.4 scanPackageLI
scanPackageLI（）中主要逻辑是scanPackageDirtyLI（）实现的，这个方法中主要做的事情有
1.设置系统App的一些参数
2.校验签名
3.校验权限
在 scanPackageLI会调用到performDexOptLI(),去执行dexopt操作
2.5 updateSettingsLI 更新设置信息
private void updateSettingsLI(PackageParser.Package newPackage, String installerPackageName,
int[] allUsers, PackageInstalledInfo res, UserHandle user, int installReason) {
// Update the parent package setting
updateSettingsInternalLI(newPackage, installerPackageName, allUsers, res.origUsers,
res, user, installReason);
// Update the child packages setting
final int childCount = (newPackage.childPackages != null)
? newPackage.childPackages.size() : 0;
for (int i = 0; i < childCount; i++) {
PackageParser.Package childPackage = newPackage.childPackages.get(i);
PackageInstalledInfo childRes = res.addedChildPackages.get(childPackage.packageName);
updateSettingsInternalLI(childPackage, installerPackageName, allUsers,
childRes.origUsers, childRes, user, installReason);
}
}
updateSettingsInternalLI()会调用到updatePermissionsLPw
private void updateSettingsInternalLI(PackageParser.Package newPackage,
String installerPackageName, int[] allUsers, int[] installedForUsers,
PackageInstalledInfo res, UserHandle user, int installReason) {
Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "updateSettings");
...
...
installed in " + newPackage.codePath);
synchronized (mPackages) {
updatePermissionsLPw(newPackage.packageName, newPackage,
UPDATE_PERMISSIONS_REPLACE_PKG | (newPackage.permissions.size() > 0
? UPDATE_PERMISSIONS_ALL : 0));
}
updateSettingsInternalLI()会调用到updatePermissionsLPw
更新权限信息
3.1 updatePermissionsLPw
private void updatePermissionsLPw(PackageParser.Package pkg, int flags) {
// Update the parent permissions
updatePermissionsLPw(pkg.packageName, pkg, flags);
// Update the child permissions
final int childCount = (pkg.childPackages != null) ? pkg.childPackages.size() : 0;
for (int i = 0; i < childCount; i++) {
PackageParser.Package childPkg = pkg.childPackages.get(i);
updatePermissionsLPw(childPkg.packageName, childPkg, flags);
}
}
private void updatePermissionsLPw(String changingPkg,
PackageParser.Package pkgInfo, String replaceVolumeUuid, int flags) {
...
...
if (pkgInfo != null) {
// Only replace for packages on requested volume
final String volumeUuid = getVolumeUuidForPackage(pkgInfo);
final boolean replace = ((flags & UPDATE_PERMISSIONS_REPLACE_PKG) != 0)
&& Objects.equals(replaceVolumeUuid, volumeUuid);
grantPermissionsLPw(pkgInfo, replace, changingPkg);
}
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
}
调用到grantPermissionsLPw
private void grantPermissionsLPw(PackageParser.Package pkg, boolean replace,
String packageOfInterest) {
final int N = pkg.requestedPermissions.size();
for (int i=0; i= Build.VERSION_CODES.M;
if (DEBUG_INSTALL) {
Log.i(TAG, "Package " + pkg.packageName + " checking " + name + ": " + bp);
}
if (bp == null || bp.packageSetting == null) {
if (packageOfInterest == null || packageOfInterest.equals(pkg.packageName)) {
if (DEBUG_PERMISSIONS) {
Slog.i(TAG, "Unknown permission " + name
+ " in package " + pkg.packageName);
}
}
continue;
}
// Limit ephemeral apps to ephemeral allowed permissions.
if (pkg.applicationInfo.isInstantApp() && !bp.isInstant()) {
if (DEBUG_PERMISSIONS) {
Log.i(TAG, "Denying non-ephemeral permission " + bp.name + " for package "
+ pkg.packageName);
}
continue;
}
if (bp.isRuntimeOnly() && !appSupportsRuntimePermissions) {
if (DEBUG_PERMISSIONS) {
Log.i(TAG, "Denying runtime-only permission " + bp.name + " for package "
+ pkg.packageName);
}
continue;
}
final String perm = bp.name;
boolean allowedSig = false;
int grant = GRANT_DENIED;
// Keep track of app op permissions.
if ((bp.protectionLevel & PermissionInfo.PROTECTION_FLAG_APPOP) != 0) {
ArraySet pkgs = mAppOpPermissionPackages.get(bp.name);
if (pkgs == null) {
pkgs = new ArraySet<>();
mAppOpPermissionPackages.put(bp.name, pkgs);
}
pkgs.add(pkg.packageName);
}
final int level = bp.protectionLevel & PermissionInfo.PROTECTION_MASK_BASE;
switch (level) {
case PermissionInfo.PROTECTION_NORMAL: {
// For all apps normal permissions are install time ones.
grant = GRANT_INSTALL;
} break;
case PermissionInfo.PROTECTION_DANGEROUS: {
// If a permission review is required for legacy apps we represent
// their permissions as always granted runtime ones since we need
// to keep the review required permission flag per user while an
// install permission's state is shared across all users.
if (!appSupportsRuntimePermissions && !mPermissionReviewRequired) {
// For legacy apps dangerous permissions are install time ones.
grant = GRANT_INSTALL;
} else if (origPermissions.hasInstallPermission(bp.name)) {
// For legacy apps that became modern, install becomes runtime.
grant = GRANT_UPGRADE;
} else if (mPromoteSystemApps
&& isSystemApp(ps)
&& mExistingSystemPackages.contains(ps.name)) {
// For legacy system apps, install becomes runtime.
// We cannot check hasInstallPermission() for system apps since those
// permissions were granted implicitly and not persisted pre-M.
grant = GRANT_UPGRADE;
} else {
// For modern apps keep runtime permissions unchanged.
grant = GRANT_RUNTIME;
}
} break;
case PermissionInfo.PROTECTION_SIGNATURE: {
// For all apps signature permissions are install time ones.
allowedSig = grantSignaturePermission(perm, pkg, bp, origPermissions);
if (allowedSig) {
grant = GRANT_INSTALL;
}
} break;
}
if (DEBUG_PERMISSIONS) {
Slog.i(TAG, "Granting permission " + perm + " to package " + pkg.packageName);
}
if (grant != GRANT_DENIED) {
if (!isSystemApp(ps) && ps.installPermissionsFixed) {
// If this is an existing, non-system package, then
// we can't add any new permissions to it.
if (!allowedSig && !origPermissions.hasInstallPermission(perm)) {
// Except... if this is a permission that was added
// to the platform (note: need to only do this when
// updating the platform).
if (!isNewPlatformPermissionForPackage(perm, pkg)) {
grant = GRANT_DENIED;
}
}
}
switch (grant) {
case GRANT_INSTALL: {
// Revoke this as runtime permission to handle the case of
// a runtime permission being downgraded to an install one.
// Also in permission review mode we keep dangerous permissions
// for legacy apps
for (int userId : UserManagerService.getInstance().getUserIds()) {
if (origPermissions.getRuntimePermissionState(
bp.name, userId) != null) {
// Revoke the runtime permission and clear the flags.
origPermissions.revokeRuntimePermission(bp, userId);
origPermissions.updatePermissionFlags(bp, userId,
PackageManager.MASK_PERMISSION_FLAGS, 0);
// If we revoked a permission permission, we have to write.
changedRuntimePermissionUserIds = ArrayUtils.appendInt(
changedRuntimePermissionUserIds, userId);
}
}
// Grant an install permission.
if (permissionsState.grantInstallPermission(bp) !=
PermissionsState.PERMISSION_OPERATION_FAILURE) {
changedInstallPermission = true;
}
} break;
case GRANT_RUNTIME: {
// Grant previously granted runtime permissions.
for (int userId : UserManagerService.getInstance().getUserIds()) {
PermissionState permissionState = origPermissions
.getRuntimePermissionState(bp.name, userId);
int flags = permissionState != null
? permissionState.getFlags() : 0;
if (origPermissions.hasRuntimePermission(bp.name, userId)) {
// Don't propagate the permission in a permission review mode if
// the former was revoked, i.e. marked to not propagate on upgrade.
// Note that in a permission review mode install permissions are
// represented as constantly granted runtime ones since we need to
// keep a per user state associated with the permission. Also the
// revoke on upgrade flag is no longer applicable and is reset.
final boolean revokeOnUpgrade = (flags & PackageManager
.FLAG_PERMISSION_REVOKE_ON_UPGRADE) != 0;
if (revokeOnUpgrade) {
flags &= ~PackageManager.FLAG_PERMISSION_REVOKE_ON_UPGRADE;
// Since we changed the flags, we have to write.
changedRuntimePermissionUserIds = ArrayUtils.appendInt(
changedRuntimePermissionUserIds, userId);
}
if (!mPermissionReviewRequired || !revokeOnUpgrade) {
if (permissionsState.grantRuntimePermission(bp, userId) ==
PermissionsState.PERMISSION_OPERATION_FAILURE) {
// If we cannot put the permission as it was,
// we have to write.
changedRuntimePermissionUserIds = ArrayUtils.appendInt(
changedRuntimePermissionUserIds, userId);
}
}
// If the app supports runtime permissions no need for a review.
if (mPermissionReviewRequired
&& appSupportsRuntimePermissions
&& (flags & PackageManager
.FLAG_PERMISSION_REVIEW_REQUIRED) != 0) {
flags &= ~PackageManager.FLAG_PERMISSION_REVIEW_REQUIRED;
// Since we changed the flags, we have to write.
changedRuntimePermissionUserIds = ArrayUtils.appendInt(
changedRuntimePermissionUserIds, userId);
}
} else if (mPermissionReviewRequired
&& !appSupportsRuntimePermissions) {
// For legacy apps that need a permission review, every new
// runtime permission is granted but it is pending a review.
// We also need to review only platform defined runtime
// permissions as these are the only ones the platform knows
// how to disable the API to simulate revocation as legacy
// apps don't expect to run with revoked permissions.
if (PLATFORM_PACKAGE_NAME.equals(bp.sourcePackage)) {
if ((flags & FLAG_PERMISSION_REVIEW_REQUIRED) == 0) {
flags |= FLAG_PERMISSION_REVIEW_REQUIRED;
// We changed the flags, hence have to write.
changedRuntimePermissionUserIds = ArrayUtils.appendInt(
changedRuntimePermissionUserIds, userId);
}
}
if (permissionsState.grantRuntimePermission(bp, userId)
!= PermissionsState.PERMISSION_OPERATION_FAILURE) {
// We changed the permission, hence have to write.
changedRuntimePermissionUserIds = ArrayUtils.appendInt(
changedRuntimePermissionUserIds, userId);
}
}
// Propagate the permission flags.
permissionsState.updatePermissionFlags(bp, userId, flags, flags);
}
} break;
case GRANT_UPGRADE: {
// Grant runtime permissions for a previously held install permission.
PermissionState permissionState = origPermissions
.getInstallPermissionState(bp.name);
final int flags = permissionState != null ? permissionState.getFlags() : 0;
if (origPermissions.revokeInstallPermission(bp)
!= PermissionsState.PERMISSION_OPERATION_FAILURE) {
// We will be transferring the permission flags, so clear them.
origPermissions.updatePermissionFlags(bp, UserHandle.USER_ALL,
PackageManager.MASK_PERMISSION_FLAGS, 0);
changedInstallPermission = true;
}
// If the permission is not to be promoted to runtime we ignore it and
// also its other flags as they are not applicable to install permissions.
if ((flags & PackageManager.FLAG_PERMISSION_REVOKE_ON_UPGRADE) == 0) {
for (int userId : currentUserIds) {
if (permissionsState.grantRuntimePermission(bp, userId) !=
PermissionsState.PERMISSION_OPERATION_FAILURE) {
// Transfer the permission flags.
permissionsState.updatePermissionFlags(bp, userId,
flags, flags);
// If we granted the permission, we have to write.
changedRuntimePermissionUserIds = ArrayUtils.appendInt(
changedRuntimePermissionUserIds, userId);
}
}
}
} break;
default: {
if (packageOfInterest == null
|| packageOfInterest.equals(pkg.packageName)) {
if (DEBUG_PERMISSIONS) {
Slog.i(TAG, "Not granting permission " + perm
+ " to package " + pkg.packageName
+ " because it was previously installed without");
}
}
} break;
}
} else {
if (permissionsState.revokeInstallPermission(bp) !=
PermissionsState.PERMISSION_OPERATION_FAILURE) {
// Also drop the permission flags.
permissionsState.updatePermissionFlags(bp, UserHandle.USER_ALL,
PackageManager.MASK_PERMISSION_FLAGS, 0);
changedInstallPermission = true;
Slog.i(TAG, "Un-granting permission " + perm
+ " from package " + pkg.packageName
+ " (protectionLevel=" + bp.protectionLevel
+ " flags=0x" + Integer.toHexString(pkg.applicationInfo.flags)
+ ")");
} else if ((bp.protectionLevel&PermissionInfo.PROTECTION_FLAG_APPOP) == 0) {
// Don't print warning for app op permissions, since it is fine for them
// not to be granted, there is a UI for the user to decide.
if (DEBUG_PERMISSIONS
&& (packageOfInterest == null
|| packageOfInterest.equals(pkg.packageName))) {
Slog.i(TAG, "Not granting permission " + perm
+ " to package " + pkg.packageName
+ " (protectionLevel=" + bp.protectionLevel
+ " flags=0x" + Integer.toHexString(pkg.applicationInfo.flags)
+ ")");
}
}
}
}
if ((changedInstallPermission || replace) && !ps.installPermissionsFixed &&
!isSystemApp(ps) || isUpdatedSystemApp(ps)){
// This is the first that we have heard about this package, so the
// permissions we have now selected are fixed until explicitly
// changed.
ps.installPermissionsFixed = true;
}
// Persist the runtime permissions state for users with changes. If permissions
// were revoked because no app in the shared user declares them we have to
// write synchronously to avoid losing runtime permissions state.
for (int userId : changedRuntimePermissionUserIds) {
mSettings.writeRuntimePermissionsForUserLPr(userId, runtimePermissionsRevoked);
}
}
这个方法的作用是将该app的所有权限都记录下来
四.发送安装完成广播
前面processPendingInstall方法中，在执行完installPackageLi后，会执行 bm.restoreAtInstall（）方法，实际调用的是BackupManagerService的restoreAtInstall()方法
#BackupManagerService
@Override
public void restoreAtInstall(String packageName, int token) {
...
...
if (skip) {
// Auto-restore disabled or no way to attempt a restore
if (transportClient != null) {
mTransportManager.disposeOfTransportClient(
transportClient, "BMS.restoreAtInstall()");
}
// Tell the PackageManager to proceed with the post-install handling for this package.
if (DEBUG) Slog.v(TAG, "Finishing install immediately");
try {
mPackageManagerBinder.finishPackageInstall(token, false);
} catch (RemoteException e) { /* can't happen */ }
}
}
这里会调用到 mPackageManagerBinder.finishPackageInstall(token, false)方法, 也就是PackageManagerService的finishPackageInstall()方法
#PacakageManagerService
@Override
public void finishPackageInstall(int token, boolean didLaunch) {
enforceSystemOrRoot("Only the system is allowed to finish installs");
final Message msg = mHandler.obtainMessage(POST_INSTALL, token, didLaunch ? 1 : 0);
mHandler.sendMessage(msg);
}
在PacakageManagerService的finishPackageInstall会发送POST_INSTALL的广播
# PacakageManagerService
case POST_INSTALL: {
// Handle the parent package
handlePackagePostInstall(parentRes, grantPermissions, killApp,
virtualPreload, grantedPermissions, didRestore,
args.installerPackageName, args.observer);
// Handle the child packages
final int childCount = (parentRes.addedChildPackages != null)
? parentRes.addedChildPackages.size() : 0;
for (int i = 0; i < childCount; i++) {
PackageInstalledInfo childRes = parentRes.addedChildPackages.valueAt(i);
handlePackagePostInstall(childRes, grantPermissions, killApp,
virtualPreload, grantedPermissions, false /*didRestore*/,
args.installerPackageName, args.observer);
}
// Log tracing if needed
if (args.traceMethod != null) {
Trace.asyncTraceEnd(TRACE_TAG_PACKAGE_MANAGER, args.traceMethod,
args.traceCookie);
}
} else {
Slog.e(TAG, "Bogus post-install token " + msg.arg1);
}
} break;
private void handlePackagePostInstall(PackageInstalledInfo res, boolean grantPermissions,
boolean killApp, boolean virtualPreload, String[] grantedPermissions,
boolean launchedForRestore, String installerPackage,
IPackageInstallObserver2 installObserver) {
if (update) {
extras.putBoolean(Intent.EXTRA_REPLACING, true);
}
sendPackageBroadcast(Intent.ACTION_PACKAGE_ADDED, packageName,
extras, 0 /*flags*/,
null /*targetPackage*/, null /*finishedReceiver*/,
updateUserIds, instantUserIds);
if (installerPackageName != null) {
sendPackageBroadcast(Intent.ACTION_PACKAGE_ADDED, packageName,
extras, 0 /*flags*/,
installerPackageName, null /*finishedReceiver*/,
updateUserIds, instantUserIds);
}
if (update) {
sendPackageBroadcast(Intent.ACTION_PACKAGE_REPLACED,
packageName, extras, 0 /*flags*/,
null /*targetPackage*/, null /*finishedReceiver*/,
updateUserIds, instantUserIds);
if (installerPackageName != null) {
sendPackageBroadcast(Intent.ACTION_PACKAGE_REPLACED, packageName,
extras, 0 /*flags*/,
installerPackageName, null /*finishedReceiver*/,
updateUserIds, instantUserIds);
}
if (notifyVerifier) {
sendPackageBroadcast(Intent.ACTION_PACKAGE_REPLACED, packageName,
extras, 0 /*flags*/,
mRequiredVerifierPackage, null /*finishedReceiver*/,
updateUserIds, instantUserIds);
}
sendPackageBroadcast(Intent.ACTION_MY_PACKAGE_REPLACED,
null /*package*/, null /*extras*/, 0 /*flags*/,
packageName /*targetPackage*/,
null /*finishedReceiver*/, updateUserIds, instantUserIds);
} else if (launchedForRestore && !isSystemApp(res.pkg)) {
// First-install and we did a restore, so we're responsible for the
// first-launch broadcast.
if (DEBUG_BACKUP) {
Slog.i(TAG, "Post-restore of " + packageName
+ " sending FIRST_LAUNCH in " + Arrays.toString(firstUserIds));
}
sendFirstLaunchBroadcast(packageName, installerPackage,
firstUserIds, firstInstantUserIds);
}
}
发送Intent.ACTION_PACKAGE_ADDED或者Intent.ACTION_PACKAGE_REPLACED的广播,至此，app的安装流程就结束了