Android 應用安裝過程分析
阿新 • • 發佈：2019-01-29
在之前的文章中，我們對PakageManagerService啟動流程分析 做了簡單的介紹，並對PMS系統的啟動流程做了詳細的解析。上面只是說到了Android的PMS的執行流程，而對於Android apk的整個安裝流程並沒有過多的介紹。本篇將重點介紹下Android apk的執行啟動流程。
總結一下，關於apk的安裝流程主要分為以下步驟：
- 將apk檔案複製到data/app目錄
- 解析apk資訊
- dexopt操作
- 更新許可權資訊
- 完成安裝,傳送Intent.ACTION_PACKAGE_ADDED廣播
用一張圖說明一下：
此圖可見，從PakageManagerService的啟動到apk的安裝完成，中間還是經歷了很多的流程。
1， 將apk檔案copy至data/app目錄
在之前的文章我們說過，安裝應用 Intent 的是 PackageInstallerActivity，但這個類廠商可以隨意修改，這個類也並沒有在 android.jar 中。PackageInstallerActivity 在安裝過程中，實際呼叫的是 ApplicationPackageManager 裡面的程式碼。
private void installCommon(Uri packageURI,
PackageInstallObserver observer, int flags, String installerPackageName,
VerificationParams verificationParams, ContainerEncryptionParams encryptionParams) {
if 在 ApplicationPackageManager 中是通過 Binder 機制呼叫了 PackageManagerService 中的 installPackage 方法，在這個方法中有個核心的方法installPackageAsUser，也就是我們前面流程圖看到的。
@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());
}installPackageAsUser
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.INSTALL_PACKAGES, null);
final int callingUid = Binder.getCallingUid();
...
...
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);
}
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, observer, installFlags,
installerPackageName, verificationParams, user, packageAbiOverride);
mHandler.sendMessage(msg);這個方法主要是判斷安裝來源,包括adb,shell,all_user,然後像PMS的mHandler傳送INIT_COPY的訊息,這個mHandler執行在一個HandlerThread中。在接受到 INIT_COPY 訊息後，將要安裝的引數資訊加入到 PendingInstalls 中去，如果是第一個安裝，還需要傳送 MCS_BOUND 訊息，用於觸發實際安裝過程。
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;
}HandlerParams.startCopy
在 MCS_BOUND 訊息中取出第一個安裝請求，並呼叫 startCopy 方法。
HandlerParams params = mPendingInstalls.get(0);
if (params != null) {
if (params.startCopy()) {
// ...
}
// ...
}handleStartCopy()
在 startCopy 中呼叫 handleStartCopy 方法，由於這個類，需要與 MCS (MediaContainerService) 進行通訊，有可能發生異常，因而這裡設定了重試機制。
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;
}
handleReturnCode();handleStartCopy的核心就是copyApk,其他的都是些儲存空間檢查,許可權檢查等等安全校驗。
2， 解析apk資訊
完成apk copy到data/app目錄的操作後,下一步就到了 handleReturnCode,這個方法又跳轉到processPendingInstall()方法,下面先來看看processPendingInstall()方法。
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.安裝
}
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.呼叫backup服務
} 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);
}
}
});
}在這個方法有幾個關鍵步驟：
一是installPackageLI(args, res);,這個方法具體執行了解析package和後續操作,
而再installPackageLI(args, res);執行完畢後會走到bm.restoreAtInstall(res.pkg.applicationInfo.packageName, token);,會呼叫backupservice的restoreAtInstall方法,而restoreAtInstall方法最終又會呼叫PMS的finishPackageInstall()方法,完成安裝。
installPackageLI
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 {
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;
if ((pkg.applicationInfo.flags&ApplicationInfo.FLAG_TEST_ONLY) != 0) {
if ((installFlags & PackageManager.INSTALL_ALLOW_TEST) == 0) {
res.setError(INSTALL_FAILED_TEST_ONLY, "installPackageLI");
return;
}
}
try {
pp.collectCertificates(pkg, parseFlags);
pp.collectManifestDigest(pkg);
} catch (PackageParserException e) {
res.setError("Failed collect during installPackageLI", e);
return;
}
/* If the installer passed in a manifest digest, compare it now. */
if (args.manifestDigest != null) {
if (DEBUG_INSTALL) {
final String parsedManifest = pkg.manifestDigest == null ? "null"
: pkg.manifestDigest.toString();
Slog.d(TAG, "Comparing manifests: " + args.manifestDigest.toString() + " vs. "
+ parsedManifest);
}
if (!args.manifestDigest.equals(pkg.manifestDigest)) {
res.setError(INSTALL_FAILED_PACKAGE_CHANGED, "Manifest digest changed");
return;
}
} else if (DEBUG_INSTALL) {
final String parsedManifest = pkg.manifestDigest == null
? "null" : pkg.manifestDigest.toString();
Slog.d(TAG, "manifestDigest was not present, but parser got: " + parsedManifest);
}
// Get rid of all references to package scan path via parser.
pp = null;
String oldCodePath = null;
boolean systemApp = false;
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.
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 (systemApp && onSd) {
// 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.doRename(res.returnCode, pkg, oldCodePath)) {
res.setError(INSTALL_FAILED_INSUFFICIENT_STORAGE, "Failed rename");
return;
}
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);
}
}
}這個方法先是解析了package包,然後做了大量簽名和許可權校驗的工作，最終走到判斷是安裝新的apk還是覆蓋安裝的判斷語句上。
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);
}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);
}
}這個方法核心的步驟有兩個:
- PackageParser.Package newPackage = scanPackageLI(pkg, parseFlags,
scanFlags,System.currentTimeMillis(), user); - updateSettingsLI(newPackage, installerPackageName, null, null, res);
scanPackageLI負責安裝,而updateSettingLI則是完成安裝後的設定資訊更新。
scanPackageLI()
scanPackageLI()方法主要邏輯是由scanPackageDirtyLI()實現的，在這個方法中主要做了如下的操作：
- 設定系統App的一些引數
- 校驗簽名
- 解析app的provider,校驗是否與已有的provider衝突
- 32/64位abi的一些設定
- 四大元件的解析，註冊
3，dexopt操作
Apk檔案其實就是一個歸檔zip壓縮包,而我們編寫的程式碼最終都編譯成了.dex檔案,但為了提高執行效能,android系統並不會直接執行.dex,而是會在安裝過程中執行dexopt操作來優化.dex檔案,最終android系統執行的時優化後的’odex’檔案(注意:這個odex檔案的字尾也是.dex,其路徑在data/dalvik-cache)。對於dalvik虛擬機器,dexopt就是優化操作,而對於art虛擬機器,dexopt執行的則是dex2oat操作,既將.dex檔案翻譯成oat檔案。關於art和dex2oat的更多資訊請自行搜尋相關資料。
performDexOptLI()
performDexOptLI的一個核心方法：
final int ret = mInstaller.dexopt(path, sharedGid, !isForwardLocked(pkg), pkg.packageName, dexCodeInstructionSet, vmSafeMode);本方法的核心就是呼叫PMS的mInstaller成員變數的dexopt操作。
Installer.dexopt
Installer類的dexopt方法又呼叫InstallerConnection類的dexopt方法。
public int dexopt(String apkPath, int uid, boolean isPublic, String pkgName,
String instructionSet, boolean vmSafeMode) {
StringBuilder builder = new StringBuilder("dexopt");
builder.append(' ');
builder.append(apkPath);
builder.append(' ');
builder.append(uid);
builder.append(isPublic ? " 1" : " 0");
builder.append(' ');
builder.append(pkgName);
builder.append(' ');
builder.append(instructionSet);
builder.append(' ');
builder.append(vmSafeMode ? " 1" : " 0");
return execute(builder.toString());
}
public synchronized String transact(String cmd) {
if (!connect()) {
Slog.e(TAG, "connection failed");
return "-1";
}
if (!writeCommand(cmd)) {
/*
* If installd died and restarted in the background (unlikely but
* possible) we'll fail on the next write (this one). Try to
* reconnect and write the command one more time before giving up.
*/
Slog.e(TAG, "write command failed? reconnect!");
if (!connect() || !writeCommand(cmd)) {
return "-1";
}
}
if (LOCAL_DEBUG) {
Slog.i(TAG, "send: '" + cmd + "'");
}
final int replyLength = readReply();
if (replyLength > 0) {
String s = new String(buf, 0, replyLength);
if (LOCAL_DEBUG) {
Slog.i(TAG, "recv: '" + s + "'");
}
return s;
} else {
if (LOCAL_DEBUG) {
Slog.i(TAG, "fail");
}
return "-1";
}
}
public int execute(String cmd) {
String res = transact(cmd);
try {
return Integer.parseInt(res);
} catch (NumberFormatException ex) {
return -1;
}
}
private boolean connect() {
if (mSocket != null) {
return true;
}
Slog.i(TAG, "connecting...");
try {
mSocket = new LocalSocket();
LocalSocketAddress address = new LocalSocketAddress("installd",
LocalSocketAddress.Namespace.RESERVED);
mSocket.connect(address);
mIn = mSocket.getInputStream();
mOut = mSocket.getOutputStream();
} catch (IOException ex) {
disconnect();
return false;
}
return true;
}由上面的幾個方法可以知道,最終dexopt操作是通過socket的方式來跨程序通知守護程序installd,由其去執行dexopt操作。
dexopt()
最終守護程序installd會呼叫Commands.c檔案(位於/source/framework/native/cmds/installd)的dexopt方法。
int dexopt(const char *apk_path, uid_t uid, bool is_public,
const char *pkgname, const char *instruction_set,
bool vm_safe_mode, bool is_patchoat)
{
struct utimbuf ut;
struct stat input_stat, dex_stat;
char out_path[PKG_PATH_MAX];
char persist_sys_dalvik_vm_lib[PROPERTY_VALUE_MAX];
char *end;
const char *input_file;
char in_odex_path[PKG_PATH_MAX];
int res, input_fd=-1, out_fd=-1;
...
...
pid_t pid;
pid = fork();
if (pid == 0) {
/* child -- drop privileges before continuing */
if (setgid(uid) != 0) {
ALOGE("setgid(%d) failed in installd during dexopt\n", uid);
exit(64);
}
if (setuid(uid) != 0) {
ALOGE("setuid(%d) failed in installd during dexopt\n", uid);
exit(65);
}
// drop capabilities
struct __user_cap_header_struct capheader;
struct __user_cap_data_struct capdata[2];
memset(&capheader, 0, sizeof(capheader));
memset(&capdata, 0, sizeof(capdata));
capheader.version = _LINUX_CAPABILITY_VERSION_3;
if (capset(&capheader, &capdata[0]) < 0) {
ALOGE("capset failed: %s\n", strerror(errno));
exit(66);
}
if (set_sched_policy(0, SP_BACKGROUND) < 0) {
ALOGE("set_sched_policy failed: %s\n", strerror(errno));
exit(70);
}
if (flock(out_fd, LOCK_EX | LOCK_NB) != 0) {
ALOGE("flock(%s) failed: %s\n", out_path, strerror(errno));
exit(67);
}
if (strncmp(persist_sys_dalvik_vm_lib, "libdvm", 6) == 0) {
run_dexopt(input_fd, out_fd, input_file, out_path);
} else if (strncmp(persist_sys_dalvik_vm_lib, "libart", 6) == 0) {
if (is_patchoat) {
run_patchoat(input_fd, out_fd, input_file, out_path, pkgname, instruction_set);
} else {
run_dex2oat(input_fd, out_fd, input_file, out_path, pkgname, instruction_set,
vm_safe_mode);
}
} else {
exit(69); /* Unexpected persist.sys.dalvik.vm.lib value */
}
exit(68); /* only get here on exec failure */
} else {
res = wait_child(pid);
if (res == 0) {
ALOGV("DexInv: --- END '%s' (success) ---\n", input_file);
} else {
ALOGE("DexInv: --- END '%s' --- status=0x%04x, process failed\n", input_file, res);
goto fail;
}
}
ut.actime = input_stat.st_atime;
ut.modtime = input_stat.st_mtime;
utime(out_path, &ut);
close(out_fd);
close(input_fd);
return 0;
fail:
if (out_fd >= 0) {
close(out_fd);
unlink(out_path);
}
if (input_fd >= 0) {
close(input_fd);
}
return -1;
}4，更新許可權資訊
dexopt操作執行完後,installNewPackageLI()方法就會走到updateSettingsLI()來更新設定資訊,而更新設定資訊主要是許可權資訊。更新許可權資訊最核心的方法是：updatePermissionsLPw()。
updatePermissionsLPw
private void updatePermissionsLPw(String changingPkg,
PackageParser.Package pkgInfo, int flags) {
// Make sure there are no dangling permission trees.
Iterator<BasePermission> it = mSettings.mPermissionTrees.values().iterator();
while (it.hasNext()) {
final BasePermission bp = it.next();
if (bp.packageSetting == null) {
// We may not yet have parsed the package, so just see if
// we still know about its settings.
bp.packageSetting = mSettings.mPackages.get(bp.sourcePackage);
}
if (bp.packageSetting == null) {
Slog.w(TAG, "Removing dangling permission tree: " + bp.name
+ " from package " + bp.sourcePackage);
it.remove();
} else if (changingPkg != null && changingPkg.equals(bp.sourcePackage)) {
if (pkgInfo == null || !hasPermission(pkgInfo, bp.name)) {
Slog.i(TAG, "Removing old permission tree: " + bp.name
+ " from package " + bp.sourcePackage);
flags |= UPDATE_PERMISSIONS_ALL;
it.remove();
}
}
}
// Make sure all dynamic permissions have been assigned to a package,
// and make sure there are no dangling permissions.
it = mSettings.mPermissions.values().iterator();
while (it.hasNext()) {
final BasePermission bp = it.next();
if (bp.type == BasePermission.TYPE_DYNAMIC) {
if (DEBUG_SETTINGS) Log.v(TAG, "Dynamic permission: name="
+ bp.name + " pkg=" + bp.sourcePackage
+ " info=" + bp.pendingInfo);
if (bp.packageSetting == null && bp.pendingInfo != null) {
final BasePermission tree = findPermissionTreeLP(bp.name);
if (tree != null && tree.perm != null) {
bp.packageSetting = tree.packageSetting;
bp.perm = new PackageParser.Permission(tree.perm.owner,
new PermissionInfo(bp.pendingInfo));
bp.perm.info.packageName = tree.perm.info.packageName;
bp.perm.info.name = bp.name;
bp.uid = tree.uid;
}
}
}
if (bp.packageSetting == null) {
// We may not yet have parsed the package, so just see if
// we still know about its settings.
bp.packageSetting = mSettings.mPackages.get(bp.sourcePackage);
}
if (bp.packageSetting == null) {
Slog.w(TAG, "Removing dangling permission: " + bp.name
+ " from package " + bp.sourcePackage);
it.remove();
} else if (changingPkg != null && changingPkg.equals(bp.sourcePackage)) {
if (pkgInfo == null || !hasPermission(pkgInfo, bp.name)) {
Slog.i(TAG, "Removing old permission: " + bp.name
+ " from package " + bp.sourcePackage);
flags |= UPDATE_PERMISSIONS_ALL;
it.remove();
}
}
}
// Now update the permissions for all packages, in particular
// replace the granted permissions of the system packages.
if ((flags&UPDATE_PERMISSIONS_ALL) != 0) {
for (PackageParser.Package pkg : mPackages.values()) {
if (pkg != pkgInfo) {
grantPermissionsLPw(pkg, (flags&UPDATE_PERMISSIONS_REPLACE_ALL) != 0,
changingPkg);
}
}
}
if (pkgInfo != null) {
grantPermissionsLPw(pkgInfo, (flags&UPDATE_PERMISSIONS_REPLACE_PKG) != 0, changingPkg);
}
}
private void grantPermissionsLPw(PackageParser.Package pkg, boolean replace,
String packageOfInterest) {
final PackageSetting ps = (PackageSetting) pkg.mExtras;
if (ps == null) {
return;
}
final GrantedPermissions gp = ps.sharedUser != null ? ps.sharedUser : ps;
HashSet<String> origPermissions = gp.grantedPermissions;
boolean changedPermission = false;
if (replace) {
ps.permissionsFixed = false;
if (gp == ps) {
origPermissions = new HashSet<String>(gp.grantedPermissions);
gp.grantedPermissions.clear();
gp.gids = mGlobalGids;
}
}
if (gp.gids == null) {
gp.gids = mGlobalGids;
}
final int N = pkg.requestedPermissions.size();
for (int i=0; i<N; i++) {
final String name = pkg.requestedPermissions.get(i);
final boolean required = pkg.requestedPermissionsRequired.get(i);
final BasePermission bp = mSettings.mPermissions.get(name);
if (DEBUG_INSTALL) {
if (gp != ps) {
Log.i(TAG, "Package " + pkg.packageName + " checking " + name + ": " + bp);
}
}
if (bp == null || bp.packageSetting == null) {
if (packageOfInterest == null || packageOfInterest.equals(pkg.packageName)) {
Slog.w(TAG, "Unknown permission " + name
+ " in package " + pkg.packageName);
}
continue;
}
final String perm = bp.name;
boolean allowed;
boolean allowedSig = false;
if ((bp.protectionLevel&PermissionInfo.PROTECTION_FLAG_APPOP) != 0) {
// Keep track of app op permissions.
ArraySet<String> pkgs = mAppOpPermissionPackages.get(bp