Settings: Set root access options appropriately

It is possible to be running a user build with a debuggable boot image.
In this case, "su" will not be available.  So only show none/adb.

Issue-Id: BACON-4461
Change-Id: Iaa7df8311b9ea81eabb1566ba6f9159fdc9fab34

Author: tdmcyngn

res/values/cm_arrays.xml

@@ -38,4 +38,14 @@
         <item>2</item>
         <item>3</item>
     </string-array>
+
+    <string-array name="root_access_entries_adb" translatable="false">
+        <item>@string/root_access_none</item>
+        <item>@string/root_access_adb</item>
+    </string-array>
+
+    <string-array name="root_access_values_adb" translatable="false">
+        <item>0</item>
+        <item>2</item>
+    </string-array>
 </resources>

res/xml/development_prefs.xml

@@ -124,9 +124,7 @@
     <ListPreference
         android:key="root_access"
         android:title="@string/root_access"
-        android:persistent="false"
-        android:entries="@array/root_access_entries"
-        android:entryValues="@array/root_access_values" />
+        android:persistent="false" />
 
     <Preference
         android:key="root_appops"

src/com/android/settings/development/DevelopmentSettings.java

@@ -108,6 +108,8 @@
 
 import lineageos.providers.LineageSettings;
 
+import org.lineageos.internal.util.FileUtils;
+
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashSet;
@@ -628,6 +630,13 @@ public void onCreate(Bundle icicle) {
         mRootAppops.setOnPreferenceClickListener(this);
 
         if (!removeRootOptionsIfRequired()) {
+            if (FileUtils.fileExists("/system/xbin/su")) {
+                mRootAccess.setEntries(R.array.root_access_entries);
+                mRootAccess.setEntryValues(R.array.root_access_values);
+            } else {
+                mRootAccess.setEntries(R.array.root_access_entries_adb);
+                mRootAccess.setEntryValues(R.array.root_access_values_adb);
+            }
             mAllPrefs.add(mRootAccess);
             mAllPrefs.add(mRootAppops);
         }