PMS构造函数流程分析

本文主要是介绍PMS构造函数流程分析，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1、相关代码文件

frameworks\base\services\core\java\com\android\server\pm\PackageManagerService.java

frameworks\base\services\core\java\com\android\server\pm\Settings.java

frameworks\base\services\core\java\com\android\server\pm\PackageSetting.java

frameworks\base\core\java\com\android\server\SystemConfig.java

frameworks\base\core\java\android\content\pm\PackageParser.java

PMS构造函数主要工作流程如下如：

1.mInstaller、mMetrics等的初始化

mFactoryTest = factoryTest;
mOnlyCore = onlyCore;
mMetrics = new DisplayMetrics();
mInstaller = installer;
2.sUserManager、mPermissionManager、mSettings的初始化

sUserManager = new UserManagerService(context, this,
new UserDataPreparer(mInstaller, mInstallLock, mContext, mOnlyCore), mPackages);
mPermissionManager = PermissionManagerService.create(context,
new DefaultPermissionGrantedCallback() {
@Override
public void onDefaultRuntimePermissionsGranted(int userId) {
synchronized(mPackages) {
mSettings.onDefaultRuntimePermissionsGrantedLPr(userId);
}
}
}, mPackages /*externalLock*/);
mDefaultPermissionPolicy = mPermissionManager.getDefaultPermissionGrantPolicy();
mSettings = new Settings(mPermissionManager.getPermissionSettings(), mPackages);
此处对权限管理、用户管理和settings进行了初始化

2.1、启动用户管理服务

代码通过读取/data/system/users路径下的目录和文件，将系统设置的默认用户信息读如内存中：

private UserManagerService(Context context, PackageManagerService pm,
UserDataPreparer userDataPreparer, Object packagesLock, File dataDir) {
mContext = context;
mPm = pm;
mPackagesLock = packagesLock;
mHandler = new MainHandler();
mUserDataPreparer = userDataPreparer;
synchronized (mPackagesLock) {
mUsersDir = new File(dataDir, USER_INFO_DIR);
mUsersDir.mkdirs();
// Make zeroth user directory, for services to migrate their files to that location
File userZeroDir = new File(mUsersDir, String.valueOf(UserHandle.USER_SYSTEM));
userZeroDir.mkdirs();
FileUtils.setPermissions(mUsersDir.toString(),
FileUtils.S_IRWXU | FileUtils.S_IRWXG | FileUtils.S_IROTH | FileUtils.S_IXOTH,
-1, -1);
mUserListFile = new File(mUsersDir, USER_LIST_FILENAME);
initDefaultGuestRestrictions();
readUserListLP();
sInstance = this;
}
mLocalService = new LocalService();
LocalServices.addService(UserManagerInternal.class, mLocalService);
mLockPatternUtils = new LockPatternUtils(mContext);
mUserStates.put(UserHandle.USER_SYSTEM, UserState.STATE_BOOTING);
}
通过添加授权回调，将每次用户的授权情况都实时的通过setting写入到本地文件中：

mSettings.onDefaultRuntimePermissionsGrantedLPr(userId);

private final class MyHandler extends Handler {
public MyHandler() {
super(BackgroundThread.getHandler().getLooper());
}

@Override
public void handleMessage(Message message) {
final int userId = message.what;
Runnable callback = (Runnable) message.obj;
//写入到本地文件：/data/system/users/0/runtime-permissions.xml中
writePermissionsSync(userId);
if (callback != null) {
callback.run();
}
}
}
Settings初始化将所有的用于存储package信息的路径文件都初始化：

Settings(File dataDir, PermissionSettings permission, Object lock) {
mLock = lock;
mPermissions = permission;
mRuntimePermissionsPersistence = new RuntimePermissionPersistence(mLock);

mSystemDir = new File(dataDir, "system");
mSystemDir.mkdirs();
FileUtils.setPermissions(mSystemDir.toString(),
FileUtils.S_IRWXU|FileUtils.S_IRWXG
|FileUtils.S_IROTH|FileUtils.S_IXOTH,
-1, -1);
mSettingsFilename = new File(mSystemDir, "packages.xml");
mBackupSettingsFilename = new File(mSystemDir, "packages-backup.xml");
mPackageListFilename = new File(mSystemDir, "packages.list");
FileUtils.setPermissions(mPackageListFilename, 0640, SYSTEM_UID, PACKAGE_INFO_GID);

final File kernelDir = new File("/config/sdcardfs");
mKernelMappingFilename = kernelDir.exists() ? kernelDir : null;

// Deprecated: Needed for migration
mStoppedPackagesFilename = new File(mSystemDir, "packages-stopped.xml");
mBackupStoppedPackagesFilename = new File(mSystemDir, "packages-stopped-backup.xml");
}
3.mSettings添加uid

mSettings.addSharedUserLPw("android.uid.system", Process.SYSTEM_UID,
ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);
mSettings.addSharedUserLPw("android.uid.phone", RADIO_UID,
ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);
mSettings.addSharedUserLPw("android.uid.log", LOG_UID,
ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);
mSettings.addSharedUserLPw("android.uid.nfc", NFC_UID,
ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);
mSettings.addSharedUserLPw("android.uid.bluetooth", BLUETOOTH_UID,
ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);
mSettings.addSharedUserLPw("android.uid.shell", SHELL_UID,
ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);
mSettings.addSharedUserLPw("android.uid.se", SE_UID,
ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);
SharedUserSetting addSharedUserLPw(String name, int uid, int pkgFlags, int pkgPrivateFlags) {
SharedUserSetting s = mSharedUsers.get(name);
if (s != null) {
if (s.userId == uid) {
return s;
}
PackageManagerService.reportSettingsProblem(Log.ERROR,
"Adding duplicate shared user, keeping first: " + name);
return null;
}
s = new SharedUserSetting(name, pkgFlags, pkgPrivateFlags);
s.userId = uid;
if (addUserIdLPw(uid, s, name)) {
//加入列表中
mSharedUsers.put(name, s);
return s;
}
return null;
}
4.mPackageDexOptimizer、mDexManager初始化

mPackageDexOptimizer = new PackageDexOptimizer(installer, mInstallLock, context,
"*dexopt*");
DexManager.Listener dexManagerListener = DexLogger.getListener(this,
installer, mInstallLock);
mDexManager = new DexManager(mContext, this, mPackageDexOptimizer, installer, mInstallLock,
dexManagerListener);
5.初始化默认系统配置，各种白名单

SystemConfig systemConfig = SystemConfig.getInstance();
SystemConfig负责从system/etc目录中读取xml文件，将其中预置的应用或者设置读取到列表中保存，如feature列表，省点白名单，共享库，允许使用流量列表等

// Group-ids that are given to all packages as read from etc/permissions/*.xml.
int[] mGlobalGids;

// These are the built-in uid -> permission mappings that were read from the
// system configuration files.
final SparseArray<ArraySet<String>> mSystemPermissions = new SparseArray<>();

// These are the built-in shared libraries that were read from the
// system configuration files. Keys are the library names; strings are the
// paths to the libraries.
final ArrayMap<String, String> mSharedLibraries = new ArrayMap<>();

// These are the features this devices supports that were read from the
// system configuration files.
final ArrayMap<String, FeatureInfo> mAvailableFeatures = new ArrayMap<>();

// These are the features which this device doesn't support; the OEM
// partition uses these to opt-out of features from the system image.
final ArraySet<String> mUnavailableFeatures = new ArraySet<>();
// These are the permission -> gid mappings that were read from the
// system configuration files.
final ArrayMap<String, PermissionEntry> mPermissions = new ArrayMap<>();

// These are the packages that are white-listed to be able to run in the
// background while in power save mode (but not whitelisted from device idle modes),
// as read from the configuration files.
final ArraySet<String> mAllowInPowerSaveExceptIdle = new ArraySet<>();

// These are the packages that are white-listed to be able to run in the
// background while in power save mode, as read from the configuration files.
final ArraySet<String> mAllowInPowerSave = new ArraySet<>();

// These are the packages that are white-listed to be able to run in the
// background while in data-usage save mode, as read from the configuration files.
final ArraySet<String> mAllowInDataUsageSave = new ArraySet<>();

// These are the packages that are white-listed to be able to run background location
// without throttling, as read from the configuration files.
final ArraySet<String> mAllowUnthrottledLocation = new ArraySet<>();

// These are the action strings of broadcasts which are whitelisted to
// be delivered anonymously even to apps which target O+.
final ArraySet<String> mAllowImplicitBroadcasts = new ArraySet<>();

// These are the package names of apps which should be in the 'always'
// URL-handling state upon factory reset.
final ArraySet<String> mLinkedApps = new ArraySet<>();

// These are the packages that are whitelisted to be able to run as system user
final ArraySet<String> mSystemUserWhitelistedApps = new ArraySet<>();

// These are the packages that should not run under system user
final ArraySet<String> mSystemUserBlacklistedApps = new ArraySet<>();

// These are the components that are enabled by default as VR mode listener services.
final ArraySet<ComponentName> mDefaultVrComponents = new ArraySet<>();

// These are the permitted backup transport service components
final ArraySet<ComponentName> mBackupTransportWhitelist = new ArraySet<>();

// Package names that are exempted from private API blacklisting
final ArraySet<String> mHiddenApiPackageWhitelist = new ArraySet<>();

SystemConfig() {
// Read configuration from system
readPermissions(Environment.buildPath(
Environment.getRootDirectory(), "etc", "sysconfig"), ALLOW_ALL);

// Read configuration from the old permissions dir
readPermissions(Environment.buildPath(
Environment.getRootDirectory(), "etc", "permissions"), ALLOW_ALL);

// Vendors are only allowed to customze libs, features and privapp permissions
int vendorPermissionFlag = ALLOW_LIBS | ALLOW_FEATURES | ALLOW_PRIVAPP_PERMISSIONS;
if (Build.VERSION.FIRST_SDK_INT <= Build.VERSION_CODES.O_MR1) {
// For backward compatibility
vendorPermissionFlag |= (ALLOW_PERMISSIONS | ALLOW_APP_CONFIGS);
}
readPermissions(Environment.buildPath(
Environment.getVendorDirectory(), "etc", "sysconfig"), vendorPermissionFlag);
readPermissions(Environment.buildPath(
Environment.getVendorDirectory(), "etc", "permissions"), vendorPermissionFlag);

// Allow ODM to customize system configs as much as Vendor, because /odm is another
// vendor partition other than /vendor.
int odmPermissionFlag = vendorPermissionFlag;
readPermissions(Environment.buildPath(
Environment.getOdmDirectory(), "etc", "sysconfig"), odmPermissionFlag);
readPermissions(Environment.buildPath(
Environment.getOdmDirectory(), "etc", "permissions"), odmPermissionFlag);

// Allow OEM to customize features and OEM permissions
int oemPermissionFlag = ALLOW_FEATURES | ALLOW_OEM_PERMISSIONS;
readPermissions(Environment.buildPath(
Environment.getOemDirectory(), "etc", "sysconfig"), oemPermissionFlag);
readPermissions(Environment.buildPath(
Environment.getOemDirectory(), "etc", "permissions"), oemPermissionFlag);

// Allow Product to customize system configs around libs, features, permissions and apps
int productPermissionFlag = ALLOW_LIBS | ALLOW_FEATURES | ALLOW_PERMISSIONS |
ALLOW_APP_CONFIGS | ALLOW_PRIVAPP_PERMISSIONS;
readPermissions(Environment.buildPath(
Environment.getProductDirectory(), "etc", "sysconfig"), productPermissionFlag);
readPermissions(Environment.buildPath(
Environment.getProductDirectory(), "etc", "permissions"), productPermissionFlag);
}
6.初始化保护应用

mProtectedPackages = new ProtectedPackages(mContext);
7.初始化内部消息循环，加入watchdog

mHandlerThread = new ServiceThread(TAG,
Process.THREAD_PRIORITY_BACKGROUND, true /*allowIo*/);
mHandlerThread.start();
mHandler = new PackageHandler(mHandlerThread.getLooper());
mProcessLoggingHandler = new ProcessLoggingHandler();
Watchdog.getInstance().addThread(mHandler, WATCHDOG_TIMEOUT);
PMS中的应用安装、卸载等操作都是PackageHandler来实现异步操作的

8.将系统默认设置的共享库添加到pms中android共享库中

ArrayMap<String, String> libConfig = systemConfig.getSharedLibraries();
final int builtInLibCount = libConfig.size();
for (int i = 0; i < builtInLibCount; i++) {
String name = libConfig.keyAt(i);
String path = libConfig.valueAt(i);
//PLATFORM_PACKAGE_NAME:android
addSharedLibraryLPw(path, null, name, SharedLibraryInfo.VERSION_UNDEFINED,
SharedLibraryInfo.TYPE_BUILTIN, PLATFORM_PACKAGE_NAME, 0);
}

private boolean addSharedLibraryLPw(String path, String apk, String name, long version,
int type, String declaringPackageName, long declaringVersionCode) {
LongSparseArray<SharedLibraryEntry> versionedLib = mSharedLibraries.get(name);
if (versionedLib == null) {
versionedLib = new LongSparseArray<>();
mSharedLibraries.put(name, versionedLib);
if (type == SharedLibraryInfo.TYPE_STATIC) {
mStaticLibsByDeclaringPackage.put(declaringPackageName, versionedLib);
}
} else if (versionedLib.indexOfKey(version) >= 0) {
return false;
}
SharedLibraryEntry libEntry = new SharedLibraryEntry(path, apk, name,
version, type, declaringPackageName, declaringVersionCode);
versionedLib.put(version, libEntry);
return true;
}
9.初始化selinux策略

SELinuxMMAC.readInstallPolicy();
SELinuxMMAC中通过读取位于/system/etc/selinux下的文件，获取系统默认的selinux policy

static {
// Platform mac permissions.
sMacPermissions.add(new File(
Environment.getRootDirectory(), "/etc/selinux/plat_mac_permissions.xml"));

// Vendor mac permissions.
// The filename has been renamed from nonplat_mac_permissions to
// vendor_mac_permissions. Either of them should exist.
final File vendorMacPermission = new File(
Environment.getVendorDirectory(), "/etc/selinux/vendor_mac_permissions.xml");
if (vendorMacPermission.exists()) {
sMacPermissions.add(vendorMacPermission);
} else {
// For backward compatibility.
sMacPermissions.add(new File(Environment.getVendorDirectory(),
"/etc/selinux/nonplat_mac_permissions.xml"));
}

// ODM mac permissions (optional).
final File odmMacPermission = new File(
Environment.getOdmDirectory(), "/etc/selinux/odm_mac_permissions.xml");
if (odmMacPermission.exists()) {
sMacPermissions.add(odmMacPermission);
}
}

public static boolean readInstallPolicy() {
synchronized (sPolicies) {
if (sPolicyRead) {
return true;
}
}

// Temp structure to hold the rules while we parse the xml file
List<Policy> policies = new ArrayList<>();

FileReader policyFile = null;
XmlPullParser parser = Xml.newPullParser();

final int count = sMacPermissions.size();
for (int i = 0; i < count; ++i) {
final File macPermission = sMacPermissions.get(i);
try {
policyFile = new FileReader(macPermission);
Slog.d(TAG, "Using policy file " + macPermission);

parser.setInput(policyFile);
parser.nextTag();
parser.require(XmlPullParser.START_TAG, null, "policy");

while (parser.next() != XmlPullParser.END_TAG) {
if (parser.getEventType() != XmlPullParser.START_TAG) {
continue;
}

switch (parser.getName()) {
case "signer":
policies.add(readSignerOrThrow(parser));
break;
default:
skip(parser);
}
}
//......
}

private static Policy readSignerOrThrow(XmlPullParser parser) throws IOException,
XmlPullParserException {

parser.require(XmlPullParser.START_TAG, null, "signer");
Policy.PolicyBuilder pb = new Policy.PolicyBuilder();

// Check for a cert attached to the signer tag. We allow a signature
// to appear as an attribute as well as those attached to cert tags.
String cert = parser.getAttributeValue(null, "signature");
if (cert != null) {
pb.addSignature(cert);
}

while (parser.next() != XmlPullParser.END_TAG) {
if (parser.getEventType() != XmlPullParser.START_TAG) {
continue;
}

String tagName = parser.getName();
if ("seinfo".equals(tagName)) {
String seinfo = parser.getAttributeValue(null, "value");
pb.setGlobalSeinfoOrThrow(seinfo);
readSeinfo(parser);
} else if ("package".equals(tagName)) {
readPackageOrThrow(parser, pb);
} else if ("cert".equals(tagName)) {
String sig = parser.getAttributeValue(null, "signature");
pb.addSignature(sig);
readCert(parser);
} else {
skip(parser);
}
}

return pb.build();
}
10.解析package.xml等文件初始化settings中各列表

Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "read user settings");
mFirstBoot = !mSettings.readLPw(sUserManager.getUsers(false));
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);

boolean readLPw(@NonNull List<UserInfo> users) {
//依次查找packages-backup.xml，如果该文件不存在，则查找packages.xml

while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
&& (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {
String tagName = parser.getName();
if (tagName.equals("package")) {
readPackageLPw(parser);
} else if (tagName.equals("permissions")) {
mPermissions.readPermissions(parser);
} else if (tagName.equals("permission-trees")) {
mPermissions.readPermissionTrees(parser);
} else if (tagName.equals("shared-user")) {
readSharedUserLPw(parser);
} else if (tagName.equals("preferred-packages")) {
// no longer used.
} else if (tagName.equals("preferred-activities")) {
// Upgrading from old single-user implementation;
// these are the preferred activities for user 0.
readPreferredActivitiesLPw(parser, 0);
} else if (tagName.equals(TAG_PERSISTENT_PREFERRED_ACTIVITIES)) {
// TODO: check whether this is okay! as it is very
// similar to how preferred-activities are treated
readPersistentPreferredActivitiesLPw(parser, 0);
} else if (tagName.equals(TAG_CROSS_PROFILE_INTENT_FILTERS)) {
// TODO: check whether this is okay! as it is very
// similar to how preferred-activities are treated
readCrossProfileIntentFiltersLPw(parser, 0);
} else if (tagName.equals(TAG_DEFAULT_BROWSER)) {
readDefaultAppsLPw(parser, 0);
} else if (tagName.equals("updated-package")) {
readDisabledSysPackageLPw(parser);
} else if (tagName.equals("cleaning-package")) {
String name = parser.getAttributeValue(null, ATTR_NAME);
String userStr = parser.getAttributeValue(null, ATTR_USER);
String codeStr = parser.getAttributeValue(null, ATTR_CODE);
if (name != null) {
int userId = UserHandle.USER_SYSTEM;
boolean andCode = true;
try {
if (userStr != null) {
userId = Integer.parseInt(userStr);
}
} catch (NumberFormatException e) {
}
if (codeStr != null) {
andCode = Boolean.parseBoolean(codeStr);
}
addPackageToCleanLPw(new PackageCleanItem(userId, name, andCode));
}
} else if (tagName.equals("renamed-package")) {
String nname = parser.getAttributeValue(null, "new");
String oname = parser.getAttributeValue(null, "old");
if (nname != null && oname != null) {
mRenamedPackages.put(nname, oname);
}
} else if (tagName.equals("restored-ivi")) {
readRestoredIntentFilterVerifications(parser);
} else if (tagName.equals("last-platform-version")) {
// Upgrade from older XML schema
final VersionInfo internal = findOrCreateVersion(
StorageManager.UUID_PRIVATE_INTERNAL);
final VersionInfo external = findOrCreateVersion(
StorageManager.UUID_PRIMARY_PHYSICAL);

internal.sdkVersion = XmlUtils.readIntAttribute(parser, "internal", 0);
external.sdkVersion = XmlUtils.readIntAttribute(parser, "external", 0);
internal.fingerprint = external.fingerprint =
XmlUtils.readStringAttribute(parser, "fingerprint");

} else if (tagName.equals("database-version")) {
// Upgrade from older XML schema
final VersionInfo internal = findOrCreateVersion(
StorageManager.UUID_PRIVATE_INTERNAL);
final VersionInfo external = findOrCreateVersion(
StorageManager.UUID_PRIMARY_PHYSICAL);

internal.databaseVersion = XmlUtils.readIntAttribute(parser, "internal", 0);
external.databaseVersion = XmlUtils.readIntAttribute(parser, "external", 0);

} else if (tagName.equals("verifier")) {
final String deviceIdentity = parser.getAttributeValue(null, "device");
try {
mVerifierDeviceIdentity = VerifierDeviceIdentity.parse(deviceIdentity);
} catch (IllegalArgumentException e) {
Slog.w(PackageManagerService.TAG, "Discard invalid verifier device id: "
+ e.getMessage());
}
} else if (TAG_READ_EXTERNAL_STORAGE.equals(tagName)) {
final String enforcement = parser.getAttributeValue(null, ATTR_ENFORCEMENT);
mReadExternalStorageEnforced =
"1".equals(enforcement) ? Boolean.TRUE : Boolean.FALSE;
} else if (tagName.equals("keyset-settings")) {
mKeySetManagerService.readKeySetsLPw(parser, mKeySetRefs);
} else if (TAG_VERSION.equals(tagName)) {
final String volumeUuid = XmlUtils.readStringAttribute(parser,
ATTR_VOLUME_UUID);
final VersionInfo ver = findOrCreateVersion(volumeUuid);
ver.sdkVersion = XmlUtils.readIntAttribute(parser, ATTR_SDK_VERSION);
ver.databaseVersion = XmlUtils.readIntAttribute(parser, ATTR_DATABASE_VERSION);
ver.fingerprint = XmlUtils.readStringAttribute(parser, ATTR_FINGERPRINT);
} else {
Slog.w(PackageManagerService.TAG, "Unknown element under <packages>: "
+ parser.getName());
XmlUtils.skipCurrentTag(parser);
}
}

str.close();

} catch (XmlPullParserException e) {
mReadMessages.append("Error reading: " + e.toString());
PackageManagerService.reportSettingsProblem(Log.ERROR, "Error reading settings: " + e);
Slog.wtf(PackageManagerService.TAG, "Error reading package manager settings", e);

} catch (java.io.IOException e) {
mReadMessages.append("Error reading: " + e.toString());
PackageManagerService.reportSettingsProblem(Log.ERROR, "Error reading settings: " + e);
Slog.wtf(PackageManagerService.TAG, "Error reading package manager settings", e);
}

//......
final int N = mPendingPackages.size();

for (int i = 0; i < N; i++) {
final PackageSetting p = mPendingPackages.get(i);
final int sharedUserId = p.getSharedUserId();
final Object idObj = getUserIdLPr(sharedUserId);
if (idObj instanceof SharedUserSetting) {
final SharedUserSetting sharedUser = (SharedUserSetting) idObj;
p.sharedUser = sharedUser;
p.appId = sharedUser.userId;
addPackageSettingLPw(p, sharedUser);
} else if (idObj != null) {
String msg = "Bad package setting: package " + p.name + " has shared uid "
+ sharedUserId + " that is not a shared uid\n";
mReadMessages.append(msg);
PackageManagerService.reportSettingsProblem(Log.ERROR, msg);
} else {
String msg = "Bad package setting: package " + p.name + " has shared uid "
+ sharedUserId + " that is not defined\n";
mReadMessages.append(msg);
PackageManagerService.reportSettingsProblem(Log.ERROR, msg);
}
}
mPendingPackages.clear();

if (mBackupStoppedPackagesFilename.exists()
|| mStoppedPackagesFilename.exists()) {
// Read old file
readStoppedLPw();
mBackupStoppedPackagesFilename.delete();
mStoppedPackagesFilename.delete();
// Migrate to new file format
writePackageRestrictionsLPr(UserHandle.USER_SYSTEM);
} else {
for (UserInfo user : users) {
readPackageRestrictionsLPr(user.id);
}
}

for (UserInfo user : users) {
mRuntimePermissionsPersistence.readStateForUserSyncLPr(user.id);
}

/*
* Make sure all the updated system packages have their shared users
* associated with them.
*/
final Iterator<PackageSetting> disabledIt = mDisabledSysPackages.values().iterator();
while (disabledIt.hasNext()) {
final PackageSetting disabledPs = disabledIt.next();
final Object id = getUserIdLPr(disabledPs.appId);
if (id != null && id instanceof SharedUserSetting) {
disabledPs.sharedUser = (SharedUserSetting) id;
}
}

mReadMessages.append("Read completed successfully: " + mPackages.size() + " packages, "
+ mSharedUsers.size() + " shared uids\n");

writeKernelMappingLPr();

return true;
}
通过读取文件packages-backup.xml或者packages.xml将系统中的所有应用相关信息都读入到内存中，packages.xml文件内容如下所示：

11.移除codepath已经不存在的应用

final int packageSettingCount = mSettings.mPackages.size();
for (int i = packageSettingCount - 1; i >= 0; i--) {
PackageSetting ps = mSettings.mPackages.valueAt(i);
if (!isExternal(ps) && (ps.codePath == null || !ps.codePath.exists())
&& mSettings.getDisabledSystemPkgLPr(ps.name) != null) {
mSettings.mPackages.removeAt(i);
mSettings.enableSystemPackageLPw(ps.name);
}
}

PackageSetting enableSystemPackageLPw(String name) {
PackageSetting p = mDisabledSysPackages.get(name);
if(p == null) {
Log.w(PackageManagerService.TAG, "Package " + name + " is not disabled");
return null;
}
// Reset flag in ApplicationInfo object
if((p.pkg != null) && (p.pkg.applicationInfo != null)) {
p.pkg.applicationInfo.flags &= ~ApplicationInfo.FLAG_UPDATED_SYSTEM_APP;
}
PackageSetting ret = addPackageLPw(name, p.realName, p.codePath, p.resourcePath,
p.legacyNativeLibraryPathString, p.primaryCpuAbiString,
p.secondaryCpuAbiString, p.cpuAbiOverrideString,
p.appId, p.versionCode, p.pkgFlags, p.pkgPrivateFlags,
p.parentPackageName, p.childPackageNames, p.usesStaticLibraries,
p.usesStaticLibrariesVersions);
mDisabledSysPackages.remove(name);
return ret;
}
12.初始化系统文件路径，是否升级版本

final String bootClassPath = System.getenv("BOOTCLASSPATH");
final String systemServerClassPath = System.getenv("SYSTEMSERVERCLASSPATH");
File frameworkDir = new File(Environment.getRootDirectory(), "framework");

final VersionInfo ver = mSettings.getInternalVersion();
mIsUpgrade = !Build.FINGERPRINT.equals(ver.fingerprint);
if (mIsUpgrade) {
logCriticalInfo(Log.INFO,
"Upgrading from " + ver.fingerprint + " to " + Build.FINGERPRINT);
}

// when upgrading from pre-M, promote system app permissions from install to runtime
mPromoteSystemApps =
mIsUpgrade && ver.sdkVersion <= Build.VERSION_CODES.LOLLIPOP_MR1;

// When upgrading from pre-N, we need to handle package extraction like first boot,
// as there is no profiling data available.
mIsPreNUpgrade = mIsUpgrade && ver.sdkVersion < Build.VERSION_CODES.N;

mIsPreNMR1Upgrade = mIsUpgrade && ver.sdkVersion < Build.VERSION_CODES.N_MR1;

13.从M上级上来的系统app加入mExistingSystemPackages列表中，促使安装权限修改为运行时权限

if (mPromoteSystemApps) {
Iterator<PackageSetting> pkgSettingIter = mSettings.mPackages.values().iterator();
while (pkgSettingIter.hasNext()) {
PackageSetting ps = pkgSettingIter.next();
if (isSystemApp(ps)) {
mExistingSystemPackages.add(ps.name);
}
}
}

14.初始化mCacheDir目录

mCacheDir = preparePackageParserCache(mIsUpgrade);
private static File preparePackageParserCache(boolean isUpgrade) {

if (SystemProperties.getBoolean("pm.boot.disable_package_cache", false)) {
Slog.i(TAG, "Disabling package parser cache due to system property.");
return null;
}

// The base directory for the package parser cache lives under /data/system/.
final File cacheBaseDir = FileUtils.createDir(Environment.getDataSystemDirectory(),
"package_cache");
if (cacheBaseDir == null) {
return null;
}
if (isUpgrade) {
FileUtils.deleteContents(cacheBaseDir);
}
// Return the versioned package cache directory. This is something like
// "/data/system/package_cache/1"
File cacheDir = FileUtils.createDir(cacheBaseDir, PACKAGE_PARSER_CACHE_VERSION);
if (cacheDir == null) {
// Something went wrong. Attempt to delete everything and return.
Slog.wtf(TAG, "Cache directory cannot be created - wiping base dir " + cacheBaseDir);
FileUtils.deleteContentsAndDir(cacheBaseDir);
return null;
}

if (Build.IS_USERDEBUG && Build.VERSION.INCREMENTAL.startsWith("eng.")) {
Slog.w(TAG, "Wiping cache directory because the system partition changed.");
File frameworkDir = new File(Environment.getRootDirectory(), "framework");
if (cacheDir.lastModified() < frameworkDir.lastModified()) {
FileUtils.deleteContents(cacheBaseDir);
cacheDir = FileUtils.createDir(cacheBaseDir, PACKAGE_PARSER_CACHE_VERSION);
}
}
return cacheDir;
}
15.依次扫描vendor、product、system下的app

scanDirTracedLI(new File(VENDOR_OVERLAY_DIR),
mDefParseFlags
| PackageParser.PARSE_IS_SYSTEM_DIR,
scanFlags
| SCAN_AS_SYSTEM
| SCAN_AS_VENDOR,
0);
scanDirTracedLI(new File(PRODUCT_OVERLAY_DIR),
mDefParseFlags
| PackageParser.PARSE_IS_SYSTEM_DIR,
scanFlags
| SCAN_AS_SYSTEM
| SCAN_AS_PRODUCT,
0);

mParallelPackageParserCallback.findStaticOverlayPackages();

// Find base frameworks (resource packages without code).
scanDirTracedLI(frameworkDir,
mDefParseFlags
| PackageParser.PARSE_IS_SYSTEM_DIR,
scanFlags
| SCAN_NO_DEX
| SCAN_AS_SYSTEM
| SCAN_AS_PRIVILEGED,
0);

// Collect privileged system packages.
final File privilegedAppDir = new File(Environment.getRootDirectory(), "priv-app");
scanDirTracedLI(privilegedAppDir,
mDefParseFlags
| PackageParser.PARSE_IS_SYSTEM_DIR,
scanFlags
| SCAN_AS_SYSTEM
| SCAN_AS_PRIVILEGED,
0);

// Collect ordinary system packages.
final File systemAppDir = new File(Environment.getRootDirectory(), "app");
scanDirTracedLI(systemAppDir,
mDefParseFlags
| PackageParser.PARSE_IS_SYSTEM_DIR,
scanFlags
| SCAN_AS_SYSTEM,
0);
app文件扫描安装流程如下：

扫描过程中重要实体类如下：PackageParser.Package，用于保存全部apk信息。

/**
* Representation of a full package parsed from APK files on disk. A package
* consists of a single base APK, and zero or more split APKs.
*/
public final static class Package implements Parcelable {

public String packageName;

// The package name declared in the manifest as the package can be
// renamed, for example static shared libs use synthetic package names.
public String manifestPackageName;

/** Names of any split APKs, ordered by parsed splitName */
public String[] splitNames;

// TODO: work towards making these paths invariant

public String volumeUuid;

/**
* Path where this package was found on disk. For monolithic packages
* this is path to single base APK file; for cluster packages this is
* path to the cluster directory.
*/
public String codePath;

/** Path of base APK */
public String baseCodePath;
/** Paths of any split APKs, ordered by parsed splitName */
public String[] splitCodePaths;

/** Revision code of base APK */
public int baseRevisionCode;
/** Revision codes of any split APKs, ordered by parsed splitName */
public int[] splitRevisionCodes;

/** Flags of any split APKs; ordered by parsed splitName */
public int[] splitFlags;

/**
* Private flags of any split APKs; ordered by parsed splitName.
*
* {@hide}
*/
public int[] splitPrivateFlags;

public boolean baseHardwareAccelerated;

// For now we only support one application per package.
public ApplicationInfo applicationInfo = new ApplicationInfo();

public final ArrayList<Permission> permissions = new ArrayList<Permission>(0);
public final ArrayList<PermissionGroup> permissionGroups = new ArrayList<PermissionGroup>(0);
public final ArrayList<Activity> activities = new ArrayList<Activity>(0);
public final ArrayList<Activity> receivers = new ArrayList<Activity>(0);
public final ArrayList<Provider> providers = new ArrayList<Provider>(0);
public final ArrayList<Service> services = new ArrayList<Service>(0);
public final ArrayList<Instrumentation> instrumentation = new ArrayList<Instrumentation>(0);

public final ArrayList<String> requestedPermissions = new ArrayList<String>();

public ArrayList<String> protectedBroadcasts;

public Package parentPackage;
public ArrayList<Package> childPackages;

public String staticSharedLibName = null;
public long staticSharedLibVersion = 0;
public ArrayList<String> libraryNames = null;
public ArrayList<String> usesLibraries = null;
public ArrayList<String> usesStaticLibraries = null;
public long[] usesStaticLibrariesVersions = null;
public String[][] usesStaticLibrariesCertDigests = null;
public ArrayList<String> usesOptionalLibraries = null;
public String[] usesLibraryFiles = null;

public ArrayList<ActivityIntentInfo> preferredActivityFilters = null;

public ArrayList<String> mOriginalPackages = null;
public String mRealPackage = null;
public ArrayList<String> mAdoptPermissions = null;

// We store the application meta-data independently to avoid multiple unwanted references
public Bundle mAppMetaData = null;

// The version code declared for this package.
public int mVersionCode;

// The major version code declared for this package.
public int mVersionCodeMajor;

// Return long containing mVersionCode and mVersionCodeMajor.
public long getLongVersionCode() {
return PackageInfo.composeLongVersionCode(mVersionCodeMajor, mVersionCode);
}

// The version name declared for this package.
public String mVersionName;

// The shared user id that this package wants to use.
public String mSharedUserId;

// The shared user label that this package wants to use.
public int mSharedUserLabel;

// Signatures that were read from the package.
@NonNull public SigningDetails mSigningDetails = SigningDetails.UNKNOWN;

// For use by package manager service for quick lookup of
// preferred up order.
public int mPreferredOrder = 0;

// For use by package manager to keep track of when a package was last used.
public long[] mLastPackageUsageTimeInMills =
new long[PackageManager.NOTIFY_PACKAGE_USE_REASONS_COUNT];

// // User set enabled state.
// public int mSetEnabled = PackageManager.COMPONENT_ENABLED_STATE_DEFAULT;
//
// // Whether the package has been stopped.
// public boolean mSetStopped = false;

// Additional data supplied by callers.
public Object mExtras;

// Applications hardware preferences
public ArrayList<ConfigurationInfo> configPreferences = null;

// Applications requested features
public ArrayList<FeatureInfo> reqFeatures = null;

// Applications requested feature groups
public ArrayList<FeatureGroupInfo> featureGroups = null;

public int installLocation;

public boolean coreApp;

/* An app that's required for all users and cannot be uninstalled for a user */
public boolean mRequiredForAllUsers;

/* The restricted account authenticator type that is used by this application */
public String mRestrictedAccountType;

/* The required account type without which this application will not function */
public String mRequiredAccountType;

public String mOverlayTarget;
public String mOverlayCategory;
public int mOverlayPriority;
public boolean mOverlayIsStatic;

public int mCompileSdkVersion;
public String mCompileSdkVersionCodename;

/**
* Data used to feed the KeySetManagerService
*/
public ArraySet<String> mUpgradeKeySets;
public ArrayMap<String, ArraySet<PublicKey>> mKeySetMapping;

/**
* The install time abi override for this package, if any.
*
* TODO: This seems like a horrible place to put the abiOverride because
* this isn't something the packageParser parsers. However, this fits in with
* the rest of the PackageManager where package scanning randomly pushes
* and prods fields out of {@code this.applicationInfo}.
*/
public String cpuAbiOverride;
/**
* The install time abi override to choose 32bit abi's when multiple abi's
* are present. This is only meaningfull for multiarch applications.
* The use32bitAbi attribute is ignored if cpuAbiOverride is also set.
*/
public boolean use32bitAbi;

public byte[] restrictUpdateHash;

/** Set if the app or any of its components are visible to instant applications. */
public boolean visibleToInstantApps;
/** Whether or not the package is a stub and must be replaced by the full version. */
public boolean isStub;
16.对于非核心应用，处理Stub packages跟已经disable状态的应用

final Iterator<PackageParser.Package> pkgIterator = mPackages.values().iterator();
while (pkgIterator.hasNext()) {
final PackageParser.Package pkg = pkgIterator.next();
if (pkg.isStub) {
stubSystemApps.add(pkg.packageName);
}
}
/*
* If the package is scanned, it's not erased.
*/
final PackageParser.Package scannedPkg = mPackages.get(ps.name);
if (scannedPkg != null) {
/*
* If the system app is both scanned and in the
* disabled packages list, then it must have been
* added via OTA. Remove it from the currently
* scanned package so the previously user-installed
* application can be scanned.
*/
if (mSettings.isDisabledSystemPackageLPr(ps.name)) {
logCriticalInfo(Log.WARN,
"Expecting better updated system app for " + ps.name
+ "; removing system app. Last known"
+ " codePath=" + ps.codePathString
+ ", versionCode=" + ps.versionCode
+ "; scanned versionCode=" + scannedPkg.getLongVersionCode());
removePackageLI(scannedPkg, true);
mExpectingBetter.put(ps.name, ps.codePath);
}

continue;
}
private void removePackageLI(PackageParser.Package pkg, boolean chatty) {
// Remove the parent package setting
PackageSetting ps = (PackageSetting) pkg.mExtras;
if (ps != null) {
removePackageLI(ps, chatty);
}
// Remove the child package setting
final int childCount = (pkg.childPackages != null) ? pkg.childPackages.size() : 0;
for (int i = 0; i < childCount; i++) {
PackageParser.Package childPkg = pkg.childPackages.get(i);
ps = (PackageSetting) childPkg.mExtras;
if (ps != null) {
removePackageLI(ps, chatty);
}
}
}

void removePackageLI(PackageSetting ps, boolean chatty) {
if (DEBUG_INSTALL) {
if (chatty)
Log.d(TAG, "Removing package " + ps.name);
}

// writer
synchronized (mPackages) {
mPackages.remove(ps.name);
final PackageParser.Package pkg = ps.pkg;
if (pkg != null) {
cleanPackageDataStructuresLILPw(pkg, chatty);
}
}
}
17.删除中间文件：vmdl开头并且.tmp结束

private void deleteTempPackageFiles() {
final FilenameFilter filter = new FilenameFilter() {
public boolean accept(File dir, String name) {
return name.startsWith("vmdl") && name.endsWith(".tmp");
}
};
for (File file : sDrmAppPrivateInstallDir.listFiles(filter)) {
file.delete();
}
}
18.扫描data目录apk文件

scanDirTracedLI(sAppInstallDir, 0, scanFlags | SCAN_REQUIRE_KNOWN, 0);

scanDirTracedLI(sDrmAppPrivateInstallDir, mDefParseFlags
| PackageParser.PARSE_FORWARD_LOCK,
scanFlags | SCAN_REQUIRE_KNOWN, 0);
19.移除OTA升级后被禁用的app

// Remove disable package settings for updated system apps that were
// removed via an OTA. If the update is no longer present, remove the
// app completely. Otherwise, revoke their system privileges.
for (String deletedAppName : possiblyDeletedUpdatedSystemApps) {
PackageParser.Package deletedPkg = mPackages.get(deletedAppName);
mSettings.removeDisabledSystemPackageLPw(deletedAppName);
final String msg;
if (deletedPkg == null) {
// should have found an update, but, we didn't; remove everything
msg = "Updated system package " + deletedAppName
+ " no longer exists; removing its data";
// Actual deletion of code and data will be handled by later
// reconciliation step
} else {
// found an update; revoke system privileges
msg = "Updated system package + " + deletedAppName
+ " no longer exists; revoking system privileges";

// Don't do anything if a stub is removed from the system image. If
// we were to remove the uncompressed version from the /data partition,
// this is where it'd be done.

final PackageSetting deletedPs = mSettings.mPackages.get(deletedAppName);
deletedPkg.applicationInfo.flags &= ~ApplicationInfo.FLAG_SYSTEM;
deletedPs.pkgFlags &= ~ApplicationInfo.FLAG_SYSTEM;
}
logCriticalInfo(Log.WARN, msg);
}
20.回滚所有通过ota升级后系统分区优于data分区的应用

/*
* Make sure all system apps that we expected to appear on
* the userdata partition actually showed up. If they never
* appeared, crawl back and revive the system version.
*/
for (int i = 0; i < mExpectingBetter.size(); i++) {
final String packageName = mExpectingBetter.keyAt(i);
if (!mPackages.containsKey(packageName)) {
final File scanFile = mExpectingBetter.valueAt(i);

logCriticalInfo(Log.WARN, "Expected better " + packageName
+ " but never showed up; reverting to system");

final @ParseFlags int reparseFlags;
final @ScanFlags int rescanFlags;
if (FileUtils.contains(privilegedAppDir, scanFile)) {
reparseFlags =
mDefParseFlags |
PackageParser.PARSE_IS_SYSTEM_DIR;
rescanFlags =
scanFlags
| SCAN_AS_SYSTEM
| SCAN_AS_PRIVILEGED;
} else if (FileUtils.contains(systemAppDir, scanFile)) {
reparseFlags =
mDefParseFlags |
PackageParser.PARSE_IS_SYSTEM_DIR;
rescanFlags =
scanFlags
| SCAN_AS_SYSTEM;
} else if (FileUtils.contains(privilegedVendorAppDir, scanFile)
|| FileUtils.contains(privilegedOdmAppDir, scanFile)) {
reparseFlags =
mDefParseFlags |
PackageParser.PARSE_IS_SYSTEM_DIR;
rescanFlags =
scanFlags
| SCAN_AS_SYSTEM
| SCAN_AS_VENDOR
| SCAN_AS_PRIVILEGED;
} else if (FileUtils.contains(vendorAppDir, scanFile)
|| FileUtils.contains(odmAppDir, scanFile)) {
reparseFlags =
mDefParseFlags |
PackageParser.PARSE_IS_SYSTEM_DIR;
rescanFlags =
scanFlags
| SCAN_AS_SYSTEM
| SCAN_AS_VENDOR;
} else if (FileUtils.contains(oemAppDir, scanFile)) {
reparseFlags =
mDefParseFlags |
PackageParser.PARSE_IS_SYSTEM_DIR;
rescanFlags =
scanFlags
| SCAN_AS_SYSTEM
| SCAN_AS_OEM;
} else if (FileUtils.contains(privilegedProductAppDir, scanFile)) {
reparseFlags =
mDefParseFlags |
PackageParser.PARSE_IS_SYSTEM_DIR;
rescanFlags =
scanFlags
| SCAN_AS_SYSTEM
| SCAN_AS_PRODUCT
| SCAN_AS_PRIVILEGED;
} else if (FileUtils.contains(productAppDir, scanFile)) {
reparseFlags =
mDefParseFlags |
PackageParser.PARSE_IS_SYSTEM_DIR;
rescanFlags =
scanFlags
| SCAN_AS_SYSTEM
| SCAN_AS_PRODUCT;
} else {
Slog.e(TAG, "Ignoring unexpected fallback path " + scanFile);
continue;
}

mSettings.enableSystemPackageLPw(packageName);

try {
scanPackageTracedLI(scanFile, reparseFlags, rescanFlags, 0, null);
} catch (PackageManagerException e) {
Slog.e(TAG, "Failed to parse original system package: "
+ e.getMessage());
}
}
}
21.解压和安装stubbed system applications

// Uncompress and install any stubbed system applications.
// This must be done last to ensure all stubs are replaced or disabled.
decompressSystemApplications(stubSystemApps, scanFlags);
private void decompressSystemApplications(@NonNull List<String> stubSystemApps, int scanFlags) {
for (int i = stubSystemApps.size() - 1; i >= 0; --i) {
final String pkgName = stubSystemApps.get(i);
// skip if the system package is already disabled
if (mSettings.isDisabledSystemPackageLPr(pkgName)) {
stubSystemApps.remove(i);
continue;
}
// skip if the package isn't installed (?!); this should never happen
final PackageParser.Package pkg = mPackages.get(pkgName);
if (pkg == null) {
stubSystemApps.remove(i);
continue;
}
// skip if the package has been disabled by the user
final PackageSetting ps = mSettings.mPackages.get(pkgName);
if (ps != null) {
final int enabledState = ps.getEnabled(UserHandle.USER_SYSTEM);
if (enabledState == PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER) {
stubSystemApps.remove(i);
continue;
}
}

if (DEBUG_COMPRESSION) {
Slog.i(TAG, "Uncompressing system stub; pkg: " + pkgName);
}

// uncompress the binary to its eventual destination on /data
final File scanFile = decompressPackage(pkg);
if (scanFile == null) {
continue;
}

// install the package to replace the stub on /system
try {
mSettings.disableSystemPackageLPw(pkgName, true /*replaced*/);
removePackageLI(pkg, true /*chatty*/);
scanPackageTracedLI(scanFile, 0 /*reparseFlags*/, scanFlags, 0, null);
ps.setEnabled(PackageManager.COMPONENT_ENABLED_STATE_DEFAULT,
UserHandle.USER_SYSTEM, "android");
stubSystemApps.remove(i);
continue;
} catch (PackageManagerException e) {
Slog.e(TAG, "Failed to parse uncompressed system package: " + e.getMessage());
}

// any failed attempt to install the package will be cleaned up later
}

// disable any stub still left; these failed to install the full application
for (int i = stubSystemApps.size() - 1; i >= 0; --i) {
final String pkgName = stubSystemApps.get(i);
final PackageSetting ps = mSettings.mPackages.get(pkgName);
ps.setEnabled(PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
UserHandle.USER_SYSTEM, "android");
logCriticalInfo(Log.ERROR, "Stub disabled; pkg: " + pkgName);
}
}
22.解决受保护action过滤，只有setup wizard才允许优先级设置为0

// Resolve protected action filters. Only the setup wizard is allowed to
// have a high priority filter for these actions.
mSetupWizardPackage = getSetupWizardPackageName();
if (mProtectedFilters.size() > 0) {
if (DEBUG_FILTERS && mSetupWizardPackage == null) {
Slog.i(TAG, "No setup wizard;"
+ " All protected intents capped to priority 0");
}
for (ActivityIntentInfo filter : mProtectedFilters) {
if (filter.activity.info.packageName.equals(mSetupWizardPackage)) {
if (DEBUG_FILTERS) {
Slog.i(TAG, "Found setup wizard;"
+ " allow priority " + filter.getPriority() + ";"
+ " package: " + filter.activity.info.packageName
+ " activity: " + filter.activity.className
+ " priority: " + filter.getPriority());
}
// skip setup wizard; allow it to keep the high priority filter
continue;
}
if (DEBUG_FILTERS) {
Slog.i(TAG, "Protected action; cap priority to 0;"
+ " package: " + filter.activity.info.packageName
+ " activity: " + filter.activity.className
+ " origPrio: " + filter.getPriority());
}
filter.setPriority(0);
}
}
23.更新shared library信息，让所有client得到正确路径

// Now that we know all of the shared libraries, update all clients to have
// the correct library paths.
updateAllSharedLibrariesLPw(null);

private ArrayList<PackageParser.Package> updateAllSharedLibrariesLPw(
PackageParser.Package changingPkg) {
ArrayList<PackageParser.Package> res = null;
for (PackageParser.Package pkg : mPackages.values()) {
if (changingPkg != null
&& !hasString(pkg.usesLibraries, changingPkg.libraryNames)
&& !hasString(pkg.usesOptionalLibraries, changingPkg.libraryNames)
&& !ArrayUtils.contains(pkg.usesStaticLibraries,
changingPkg.staticSharedLibName)) {
return null;
}
if (res == null) {
res = new ArrayList<>();
}
res.add(pkg);
try {
updateSharedLibrariesLPr(pkg, changingPkg);
} catch (PackageManagerException e) {
// If a system app update or an app and a required lib missing we
// delete the package and for updated system apps keep the data as
// it is better for the user to reinstall than to be in an limbo
// state. Also libs disappearing under an app should never happen
// - just in case.
if (!pkg.isSystem() || pkg.isUpdatedSystemApp()) {
final int flags = pkg.isUpdatedSystemApp()
? PackageManager.DELETE_KEEP_DATA : 0;
deletePackageLIF(pkg.packageName, null, true, sUserManager.getUserIds(),
flags , null, true, null);
}
Slog.e(TAG, "updateAllSharedLibrariesLPw failed: " + e.getMessage());
}
}
return res;
}
24.更新所有package、permission信息

mPermissionManager.updateAllPermissions(
StorageManager.UUID_PRIVATE_INTERNAL, sdkUpdated, mPackages.values(),
mPermissionCallback);

if (!onlyCore && (mPromoteSystemApps || mFirstBoot)) {
for (UserInfo user : sUserManager.getUsers(true)) {
mSettings.applyDefaultPreferredAppsLPw(this, user.id);
applyFactoryDefaultBrowserLPw(user.id);
primeDomainVerificationsLPw(user.id);
}
}
25.为开机过程启动较早的应用准备存储空间，比如systemui，SettingsProvider

// Prepare storage for system user really early during boot,
// since core system apps like SettingsProvider and SystemUI
// can't wait for user to start
final int storageFlags;
if (StorageManager.isFileEncryptedNativeOrEmulated()) {
storageFlags = StorageManager.FLAG_STORAGE_DE;
} else {
storageFlags = StorageManager.FLAG_STORAGE_DE | StorageManager.FLAG_STORAGE_CE;
}
List<String> deferPackages = reconcileAppsDataLI(StorageManager.UUID_PRIVATE_INTERNAL,
UserHandle.USER_SYSTEM, storageFlags, true /* migrateAppData */,
true /* onlyCoreApps */);
mPrepareAppDataFuture = SystemServerInitThreadPool.get().submit(() -> {
TimingsTraceLog traceLog = new TimingsTraceLog("SystemServerTimingAsync",
Trace.TRACE_TAG_PACKAGE_MANAGER);
traceLog.traceBegin("AppDataFixup");
try {
mInstaller.fixupAppData(StorageManager.UUID_PRIVATE_INTERNAL,
StorageManager.FLAG_STORAGE_DE | StorageManager.FLAG_STORAGE_CE);
} catch (InstallerException e) {
Slog.w(TAG, "Trouble fixing GIDs", e);
}
traceLog.traceEnd();

traceLog.traceBegin("AppDataPrepare");
if (deferPackages == null || deferPackages.isEmpty()) {
return;
}
int count = 0;
for (String pkgName : deferPackages) {
PackageParser.Package pkg = null;
synchronized (mPackages) {
PackageSetting ps = mSettings.getPackageLPr(pkgName);
if (ps != null && ps.getInstalled(UserHandle.USER_SYSTEM)) {
pkg = ps.pkg;
}
}
if (pkg != null) {
synchronized (mInstallLock) {
prepareAppDataAndMigrateLIF(pkg, UserHandle.USER_SYSTEM, storageFlags,
true /* maybeMigrateAppData */);
}
count++;
}
}
traceLog.traceEnd();
Slog.i(TAG, "Deferred reconcileAppsData finished " + count + " packages");
}, "prepareAppData");
26.OTA后的首次正常启动，清除应用code cache

if (mIsUpgrade && !onlyCore) {
Slog.i(TAG, "Build fingerprint changed; clearing code caches");
for (int i = 0; i < mSettings.mPackages.size(); i++) {
final PackageSetting ps = mSettings.mPackages.valueAt(i);
if (Objects.equals(StorageManager.UUID_PRIVATE_INTERNAL, ps.volumeUuid)) {
// No apps are running this early, so no need to freeze
clearAppDataLIF(ps.pkg, UserHandle.USER_ALL,
StorageManager.FLAG_STORAGE_DE | StorageManager.FLAG_STORAGE_CE
| Installer.FLAG_CLEAR_CODE_CACHE_ONLY);
}
}
ver.fingerprint = Build.FINGERPRINT;
}
27.调用mSettings.writeLPr()将最新包、权限信息更新到系统文件中

mSettings.writeLPr();

void writeLPr() {
//Debug.startMethodTracing("/data/system/packageprof", 8 * 1024 * 1024);

final long startTime = SystemClock.uptimeMillis();

// Keep the old settings around until we know the new ones have
// been successfully written.
if (mSettingsFilename.exists()) {
// Presence of backup settings file indicates that we failed
// to persist settings earlier. So preserve the older
// backup for future reference since the current settings
// might have been corrupted.
if (!mBackupSettingsFilename.exists()) {
if (!mSettingsFilename.renameTo(mBackupSettingsFilename)) {
Slog.wtf(PackageManagerService.TAG,
"Unable to backup package manager settings, "
+ " current changes will be lost at reboot");
return;
}
} else {
mSettingsFilename.delete();
Slog.w(PackageManagerService.TAG, "Preserving older settings backup");
}
}

mPastSignatures.clear();

try {
FileOutputStream fstr = new FileOutputStream(mSettingsFilename);
BufferedOutputStream str = new BufferedOutputStream(fstr);

//XmlSerializer serializer = XmlUtils.serializerInstance();
XmlSerializer serializer = new FastXmlSerializer();
serializer.setOutput(str, StandardCharsets.UTF_8.name());
serializer.startDocument(null, true);
serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);

serializer.startTag(null, "packages");

for (int i = 0; i < mVersion.size(); i++) {
final String volumeUuid = mVersion.keyAt(i);
final VersionInfo ver = mVersion.valueAt(i);

serializer.startTag(null, TAG_VERSION);
XmlUtils.writeStringAttribute(serializer, ATTR_VOLUME_UUID, volumeUuid);
XmlUtils.writeIntAttribute(serializer, ATTR_SDK_VERSION, ver.sdkVersion);
XmlUtils.writeIntAttribute(serializer, ATTR_DATABASE_VERSION, ver.databaseVersion);
XmlUtils.writeStringAttribute(serializer, ATTR_FINGERPRINT, ver.fingerprint);
serializer.endTag(null, TAG_VERSION);
}

if (mVerifierDeviceIdentity != null) {
serializer.startTag(null, "verifier");
serializer.attribute(null, "device", mVerifierDeviceIdentity.toString());
serializer.endTag(null, "verifier");
}

if (mReadExternalStorageEnforced != null) {
serializer.startTag(null, TAG_READ_EXTERNAL_STORAGE);
serializer.attribute(
null, ATTR_ENFORCEMENT, mReadExternalStorageEnforced ? "1" : "0");
serializer.endTag(null, TAG_READ_EXTERNAL_STORAGE);
}

serializer.startTag(null, "permission-trees");
mPermissions.writePermissionTrees(serializer);
serializer.endTag(null, "permission-trees");

serializer.startTag(null, "permissions");
mPermissions.writePermissions(serializer);
serializer.endTag(null, "permissions");

for (final PackageSetting pkg : mPackages.values()) {
writePackageLPr(serializer, pkg);
}

for (final PackageSetting pkg : mDisabledSysPackages.values()) {
writeDisabledSysPackageLPr(serializer, pkg);
}

for (final SharedUserSetting usr : mSharedUsers.values()) {
serializer.startTag(null, "shared-user");
serializer.attribute(null, ATTR_NAME, usr.name);
serializer.attribute(null, "userId",
Integer.toString(usr.userId));
usr.signatures.writeXml(serializer, "sigs", mPastSignatures);
writePermissionsLPr(serializer, usr.getPermissionsState()
.getInstallPermissionStates());
serializer.endTag(null, "shared-user");
}

if (mPackagesToBeCleaned.size() > 0) {
for (PackageCleanItem item : mPackagesToBeCleaned) {
final String userStr = Integer.toString(item.userId);
serializer.startTag(null, "cleaning-package");
serializer.attribute(null, ATTR_NAME, item.packageName);
serializer.attribute(null, ATTR_CODE, item.andCode ? "true" : "false");
serializer.attribute(null, ATTR_USER, userStr);
serializer.endTag(null, "cleaning-package");
}
}

if (mRenamedPackages.size() > 0) {
for (Map.Entry<String, String> e : mRenamedPackages.entrySet()) {
serializer.startTag(null, "renamed-package");
serializer.attribute(null, "new", e.getKey());
serializer.attribute(null, "old", e.getValue());
serializer.endTag(null, "renamed-package");
}
}

final int numIVIs = mRestoredIntentFilterVerifications.size();
if (numIVIs > 0) {
if (DEBUG_DOMAIN_VERIFICATION) {
Slog.i(TAG, "Writing restored-ivi entries to packages.xml");
}
serializer.startTag(null, "restored-ivi");
for (int i = 0; i < numIVIs; i++) {
IntentFilterVerificationInfo ivi = mRestoredIntentFilterVerifications.valueAt(i);
writeDomainVerificationsLPr(serializer, ivi);
}
serializer.endTag(null, "restored-ivi");
} else {
if (DEBUG_DOMAIN_VERIFICATION) {
Slog.i(TAG, " no restored IVI entries to write");
}
}

mKeySetManagerService.writeKeySetManagerServiceLPr(serializer);

serializer.endTag(null, "packages");

serializer.endDocument();

str.flush();
FileUtils.sync(fstr);
str.close();

// New settings successfully written, old ones are no longer
// needed.
mBackupSettingsFilename.delete();
FileUtils.setPermissions(mSettingsFilename.toString(),
FileUtils.S_IRUSR|FileUtils.S_IWUSR
|FileUtils.S_IRGRP|FileUtils.S_IWGRP,
-1, -1);

writeKernelMappingLPr();
writePackageListLPr();
writeAllUsersPackageRestrictionsLPr();
writeAllRuntimePermissionsLPr();
com.android.internal.logging.EventLogTags.writeCommitSysConfigFile(
"package", SystemClock.uptimeMillis() - startTime);
return;

} catch(java.io.IOException e) {
Slog.wtf(PackageManagerService.TAG, "Unable to write package manager settings, "
+ "current changes will be lost at reboot", e);
}
// Clean up partially written files
if (mSettingsFilename.exists()) {
if (!mSettingsFilename.delete()) {
Slog.wtf(PackageManagerService.TAG, "Failed to clean up mangled file: "
+ mSettingsFilename);
}
}
//Debug.stopMethodTracing();
}