Add boot mode where only "core apps" are started.

A core app is one that has coreApp="true" in its manifest tag.

The system can successfully boot (though a little painfully) with
only framework-res.apk, SettingsProvider.apk, SystemUI.apk,
DefaultContainerService.apk, and Launcher2.apk set as core apps.

Currently this boot mode is always turned off.

Change-Id: Ieaa4a8031c2c391a12996aa8d8b1d65fc2b09d6b
diff --git a/core/java/android/content/pm/PackageParser.java b/core/java/android/content/pm/PackageParser.java
index c61e32f..e7b844c 100644
--- a/core/java/android/content/pm/PackageParser.java
+++ b/core/java/android/content/pm/PackageParser.java
@@ -92,6 +92,7 @@
 
     private String mArchiveSourcePath;
     private String[] mSeparateProcesses;
+    private boolean mOnlyCoreApps;
     private static final int SDK_VERSION = Build.VERSION.SDK_INT;
     private static final String SDK_CODENAME = "REL".equals(Build.VERSION.CODENAME)
             ? null : Build.VERSION.CODENAME;
@@ -180,6 +181,10 @@
         mSeparateProcesses = procs;
     }
 
+    public void setOnlyCoreApps(boolean onlyCoreApps) {
+        mOnlyCoreApps = onlyCoreApps;
+    }
+
     private static final boolean isPackageFilename(String name) {
         return name.endsWith(".apk");
     }
@@ -433,18 +438,22 @@
 
 
         if (pkg == null) {
-            if (errorException != null) {
-                Slog.w(TAG, mArchiveSourcePath, errorException);
-            } else {
-                Slog.w(TAG, mArchiveSourcePath + " (at "
-                        + parser.getPositionDescription()
-                        + "): " + errorText[0]);
+            // If we are only parsing core apps, then a null with INSTALL_SUCCEEDED
+            // just means to skip this app so don't make a fuss about it.
+            if (!mOnlyCoreApps || mParseError != PackageManager.INSTALL_SUCCEEDED) {
+                if (errorException != null) {
+                    Slog.w(TAG, mArchiveSourcePath, errorException);
+                } else {
+                    Slog.w(TAG, mArchiveSourcePath + " (at "
+                            + parser.getPositionDescription()
+                            + "): " + errorText[0]);
+                }
+                if (mParseError == PackageManager.INSTALL_SUCCEEDED) {
+                    mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED;
+                }
             }
             parser.close();
             assmgr.close();
-            if (mParseError == PackageManager.INSTALL_SUCCEEDED) {
-                mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED;
-            }
             return null;
         }
 
@@ -782,6 +791,14 @@
         }
         int type;
 
+        if (mOnlyCoreApps) {
+            boolean core = attrs.getAttributeBooleanValue(null, "coreApp", false);
+            if (!core) {
+                mParseError = PackageManager.INSTALL_SUCCEEDED;
+                return null;
+            }
+        }
+
         final Package pkg = new Package(pkgName);
         boolean foundApp = false;
         
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 72863a2..9f2eef5 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -18,7 +18,7 @@
 */
 -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="android" android:sharedUserId="android.uid.system"
+    package="android" coreApp="true" android:sharedUserId="android.uid.system"
     android:sharedUserLabel="@string/android_system_label">
 
     <!-- ================================================ -->
diff --git a/packages/DefaultContainerService/AndroidManifest.xml b/packages/DefaultContainerService/AndroidManifest.xml
index 0f47482..319eb8d 100755
--- a/packages/DefaultContainerService/AndroidManifest.xml
+++ b/packages/DefaultContainerService/AndroidManifest.xml
@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-        package="com.android.defcontainer">
+        package="com.android.defcontainer" coreApp="true">
     <uses-permission android:name="android.permission.ACCESS_DOWNLOAD_MANAGER"/>
     <uses-permission android:name="android.permission.ACCESS_ALL_DOWNLOADS"/>
     <uses-permission android:name="android.permission.ASEC_ACCESS"/>
diff --git a/packages/SettingsProvider/AndroidManifest.xml b/packages/SettingsProvider/AndroidManifest.xml
index dd0d064..0719426 100644
--- a/packages/SettingsProvider/AndroidManifest.xml
+++ b/packages/SettingsProvider/AndroidManifest.xml
@@ -1,5 +1,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
         package="com.android.providers.settings"
+        coreApp="true"
         android:sharedUserId="android.uid.system">
 
     <application android:allowClearUserData="false"
diff --git a/packages/SystemUI/AndroidManifest.xml b/packages/SystemUI/AndroidManifest.xml
index d10911f..a2452c4 100644
--- a/packages/SystemUI/AndroidManifest.xml
+++ b/packages/SystemUI/AndroidManifest.xml
@@ -1,5 +1,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
         package="com.android.systemui"
+        coreApp="true"
         android:sharedUserId="android.uid.system"
         android:process="system"
         >
diff --git a/services/java/com/android/server/SystemServer.java b/services/java/com/android/server/SystemServer.java
index 2714fc5..7e28c4f 100644
--- a/services/java/com/android/server/SystemServer.java
+++ b/services/java/com/android/server/SystemServer.java
@@ -148,7 +148,8 @@
 
             Slog.i(TAG, "Package Manager");
             pm = PackageManagerService.main(context,
-                    factoryTest != SystemServer.FACTORY_TEST_OFF);
+                    factoryTest != SystemServer.FACTORY_TEST_OFF,
+                    false);
 
             ActivityManagerService.setSystemProcess();
 
diff --git a/services/java/com/android/server/pm/PackageManagerService.java b/services/java/com/android/server/pm/PackageManagerService.java
index bfb244b..4e5ca8e 100644
--- a/services/java/com/android/server/pm/PackageManagerService.java
+++ b/services/java/com/android/server/pm/PackageManagerService.java
@@ -221,6 +221,7 @@
 
     final Context mContext;
     final boolean mFactoryTest;
+    final boolean mOnlyCore;
     final boolean mNoDexOpt;
     final DisplayMetrics mMetrics;
     final int mDefParseFlags;
@@ -809,8 +810,9 @@
         return false;
     }
 
-    public static final IPackageManager main(Context context, boolean factoryTest) {
-        PackageManagerService m = new PackageManagerService(context, factoryTest);
+    public static final IPackageManager main(Context context, boolean factoryTest,
+            boolean onlyCore) {
+        PackageManagerService m = new PackageManagerService(context, factoryTest, onlyCore);
         ServiceManager.addService("package", m);
         return m;
     }
@@ -837,7 +839,7 @@
         return res;
     }
 
-    public PackageManagerService(Context context, boolean factoryTest) {
+    public PackageManagerService(Context context, boolean factoryTest, boolean onlyCore) {
         EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_START,
                 SystemClock.uptimeMillis());
 
@@ -847,6 +849,7 @@
 
         mContext = context;
         mFactoryTest = factoryTest;
+        mOnlyCore = onlyCore;
         mNoDexOpt = "eng".equals(SystemProperties.get("ro.build.type"));
         mMetrics = new DisplayMetrics();
         mSettings = new Settings();
@@ -1051,18 +1054,20 @@
             mInstaller.moveFiles();
 
             // Prune any system packages that no longer exist.
-            Iterator<PackageSetting> psit = mSettings.mPackages.values().iterator();
-            while (psit.hasNext()) {
-                PackageSetting ps = psit.next();
-                if ((ps.pkgFlags&ApplicationInfo.FLAG_SYSTEM) != 0
-                        && !mPackages.containsKey(ps.name)
-                        && !mSettings.mDisabledSysPackages.containsKey(ps.name)) {
-                    psit.remove();
-                    String msg = "System package " + ps.name
-                            + " no longer exists; wiping its data";
-                    reportSettingsProblem(Log.WARN, msg);
-                    mInstaller.remove(ps.name, 0);
-                    mUserManager.removePackageForAllUsers(ps.name);
+            if (!mOnlyCore) {
+                Iterator<PackageSetting> psit = mSettings.mPackages.values().iterator();
+                while (psit.hasNext()) {
+                    PackageSetting ps = psit.next();
+                    if ((ps.pkgFlags&ApplicationInfo.FLAG_SYSTEM) != 0
+                            && !mPackages.containsKey(ps.name)
+                            && !mSettings.mDisabledSysPackages.containsKey(ps.name)) {
+                        psit.remove();
+                        String msg = "System package " + ps.name
+                                + " no longer exists; wiping its data";
+                        reportSettingsProblem(Log.WARN, msg);
+                        mInstaller.remove(ps.name, 0);
+                        mUserManager.removePackageForAllUsers(ps.name);
+                    }
                 }
             }
             
@@ -1077,18 +1082,23 @@
             //delete tmp files
             deleteTempPackageFiles();
 
-            EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_DATA_SCAN_START,
-                    SystemClock.uptimeMillis());
-            mAppInstallObserver = new AppDirObserver(
-                mAppInstallDir.getPath(), OBSERVER_EVENTS, false);
-            mAppInstallObserver.startWatching();
-            scanDirLI(mAppInstallDir, 0, scanMode, 0);
-
-            mDrmAppInstallObserver = new AppDirObserver(
-                mDrmAppPrivateInstallDir.getPath(), OBSERVER_EVENTS, false);
-            mDrmAppInstallObserver.startWatching();
-            scanDirLI(mDrmAppPrivateInstallDir, PackageParser.PARSE_FORWARD_LOCK,
-                    scanMode, 0);
+            if (!mOnlyCore) {
+                EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_DATA_SCAN_START,
+                        SystemClock.uptimeMillis());
+                mAppInstallObserver = new AppDirObserver(
+                    mAppInstallDir.getPath(), OBSERVER_EVENTS, false);
+                mAppInstallObserver.startWatching();
+                scanDirLI(mAppInstallDir, 0, scanMode, 0);
+    
+                mDrmAppInstallObserver = new AppDirObserver(
+                    mDrmAppPrivateInstallDir.getPath(), OBSERVER_EVENTS, false);
+                mDrmAppInstallObserver.startWatching();
+                scanDirLI(mDrmAppPrivateInstallDir, PackageParser.PARSE_FORWARD_LOCK,
+                        scanMode, 0);
+            } else {
+                mAppInstallObserver = null;
+                mDrmAppInstallObserver = null;
+            }
 
             EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_SCAN_END,
                     SystemClock.uptimeMillis());
@@ -2749,6 +2759,7 @@
         parseFlags |= mDefParseFlags;
         PackageParser pp = new PackageParser(scanPath);
         pp.setSeparateProcesses(mSeparateProcesses);
+        pp.setOnlyCoreApps(mOnlyCore);
         final PackageParser.Package pkg = pp.parsePackage(scanFile,
                 scanPath, mMetrics, parseFlags);
         if (pkg == null) {
@@ -4044,7 +4055,7 @@
                         + " info=" + bp.pendingInfo);
                 if (bp.packageSetting == null && bp.pendingInfo != null) {
                     final BasePermission tree = findPermissionTreeLP(bp.name);
-                    if (tree != null) {
+                    if (tree != null && tree.perm != null) {
                         bp.packageSetting = tree.packageSetting;
                         bp.perm = new PackageParser.Permission(tree.perm.owner,
                                 new PermissionInfo(bp.pendingInfo));