Keyguard: Don't show when booting to cryptkeeper

Fixes an issue where the keyguard would show if we booted to
cryptkeeper and a SIM PIN is set.

Note that this only happens when the telephony stack gets enabled,
which in cryptkeeper mode is usually only after an emergency call.

Change-Id: I5e5f104189a9d33c356edc181e92409bb63b59d7
Fixes: 64197124
Test: Enter cryptkeeper, make emergency call, verify SIM lock screen does not show.

packages/SystemUI/src/com/android/keyguard/KeyguardUpdateMonitor.java

@@ -38,6 +38,7 @@ import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.pm.IPackageManager;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.database.ContentObserver;
@@ -52,6 +53,7 @@ import android.os.Handler;
 import android.os.IRemoteCallback;
 import android.os.Message;
 import android.os.RemoteException;
+import android.os.ServiceManager;
 import android.os.Trace;
 import android.os.UserHandle;
 import android.os.UserManager;
@@ -157,6 +159,21 @@ public class KeyguardUpdateMonitor implements TrustManager.TrustListener {
     private static final ComponentName FALLBACK_HOME_COMPONENT = new ComponentName(
             "com.android.settings", "com.android.settings.FallbackHome");
 
+
+    /**
+     * If true, the system is in the half-boot-to-decryption-screen state.
+     * Prudently disable lockscreen.
+     */
+    public static final boolean CORE_APPS_ONLY;
+    static {
+        try {
+            CORE_APPS_ONLY = IPackageManager.Stub.asInterface(
+                    ServiceManager.getService("package")).isOnlyCoreApps();
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
+
     private static KeyguardUpdateMonitor sInstance;
 
     private final Context mContext;

packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java

@@ -1228,6 +1228,12 @@ public class KeyguardViewMediator extends SystemUI {
      * Enable the keyguard if the settings are appropriate.
      */
     private void doKeyguardLocked(Bundle options) {
+        if (KeyguardUpdateMonitor.CORE_APPS_ONLY) {
+            // Don't show keyguard during half-booted cryptkeeper stage.
+            if (DEBUG) Log.d(TAG, "doKeyguard: not showing because booting to cryptkeeper");
+            return;
+        }
+
         // if another app is disabling us, don't show
         if (!mExternallyEnabled) {
             if (DEBUG) Log.d(TAG, "doKeyguard: not showing because externally disabled");