DO NOT MERGE - Add flag to turn on/off the headless user specific blacklist/whitelist

Bug: 145626101
Test: manual: set config_systemUserPackagesBlacklistSupported
build and flash
Verify with: 1. adb shell dumpsys package packages
2. adb logcat | grep "blacklist"

Change-Id: I5b45fc86e4c5008933bf361d5bb32a2c17259655
(cherry picked from commit d1c59ec220e95f881feefb55eb099b6f602d4e05)

core/res/res/values/config.xml

@@ -1692,6 +1692,9 @@
          This feature should be disabled for most devices. -->
     <integer name="config_virtualKeyQuietTimeMillis">0</integer>
 
+    <!-- Flag indicating whether system user specific blacklist/whitelist is supported -->
+    <bool name="config_systemUserPackagesBlacklistSupported">false</bool>
+
     <!-- A list of potential packages, in priority order, that may contain an
          ephemeral resolver. Each package will be be queried for a component
          that has been granted the PACKAGE_EPHEMERAL_AGENT permission.

core/res/res/values/symbols.xml

@@ -308,6 +308,7 @@
   <java-symbol type="bool" name="config_sms_utf8_support" />
   <java-symbol type="bool" name="config_suspendWhenScreenOffDueToProximity" />
   <java-symbol type="bool" name="config_swipeDisambiguation" />
+  <java-symbol type="bool" name="config_systemUserPackagesBlacklistSupported" />
   <java-symbol type="bool" name="config_syncstorageengine_masterSyncAutomatically" />
   <java-symbol type="bool" name="config_ui_enableFadingMarquee" />
   <java-symbol type="bool" name="config_enableHapticTextHandle" />

services/core/java/com/android/server/pm/PackageManagerService.java

@@ -2320,12 +2320,26 @@ public class PackageManagerService extends IPackageManager.Stub
         return m;
     }
 
+    private boolean isSystemUserPackagesBlacklistSupported() {
+        return Resources.getSystem().getBoolean(
+              R.bool.config_systemUserPackagesBlacklistSupported);
+    }
+
     private void enableSystemUserPackages() {
-        boolean isHeadlessSystemUserMode = UserManager.isHeadlessSystemUserMode();
+        if (!isSystemUserPackagesBlacklistSupported()) {
-        if (!isHeadlessSystemUserMode && !UserManager.isSplitSystemUser()) {
+            Log.i(TAG, "Skipping system user blacklist since "
+                    + "config_systemUserPackagesBlacklistSupported is false");
             return;
         }
 
+        boolean isHeadlessSystemUserMode = UserManager.isHeadlessSystemUserMode();
+        if (!isHeadlessSystemUserMode && !UserManager.isSplitSystemUser()) {
+            Log.i(TAG, "Skipping system user blacklist on 'regular' device type");
+            return;
+        }
+
+        Log.i(TAG, "blacklisting packages for system user");
+
         Set<String> enableApps = new ArraySet<>();
         AppsQueryHelper queryHelper = new AppsQueryHelper(this);
         List<String> allAps = queryHelper.queryApps(0, /* systemAppsOnly */ false,
@@ -22296,6 +22310,11 @@ public class PackageManagerService extends IPackageManager.Stub
 
             if (dumpState.isDumping(DumpState.DUMP_PACKAGES)) {
                 mSettings.dumpPackagesLPr(pw, packageName, permissionNames, dumpState, checkin);
+
+                boolean systemUserPackagesBlacklistSupported =
+                        isSystemUserPackagesBlacklistSupported();
+                pw.println("isSystemUserPackagesBlacklistSupported: "
+                        + systemUserPackagesBlacklistSupported);
             }
 
             if (dumpState.isDumping(DumpState.DUMP_SHARED_USERS)) {