Updater: Add /mnt/scratch detection

Change-Id: Ie4d408791c24ce0b592882a0e6c5af12bd16addb

app/src/main/java/org/lineageos/updater/UpdatesListAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2017-2023 The LineageOS Project
+ * Copyright (C) 2017-2024 The LineageOS Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -63,10 +63,13 @@ import org.lineageos.updater.model.UpdateInfo;
 import org.lineageos.updater.model.UpdateStatus;
 
 import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.text.DateFormat;
 import java.text.NumberFormat;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Stream;
 
 public class UpdatesListAdapter extends RecyclerView.Adapter<UpdatesListAdapter.ViewHolder> {
 
@@ -475,6 +478,12 @@ public class UpdatesListAdapter extends RecyclerView.Adapter<UpdatesListAdapter.
                     .setMessage(message)
                     .setPositiveButton(android.R.string.ok, null);
         }
+        if (isScratchMounted()) {
+            return new AlertDialog.Builder(mActivity)
+                    .setTitle(R.string.dialog_scratch_mounted_title)
+                    .setMessage(R.string.dialog_scratch_mounted_message)
+                    .setPositiveButton(android.R.string.ok, null);
+        }
         UpdateInfo update = mUpdaterController.getUpdate(downloadId);
         int resId;
         try {
@@ -609,4 +618,12 @@ public class UpdatesListAdapter extends RecyclerView.Adapter<UpdatesListAdapter.
                 mActivity.getResources().getInteger(R.integer.battery_ok_percentage_discharging);
         return percent >= required;
     }
+
+    private static boolean isScratchMounted() {
+        try (Stream<String> lines = Files.lines(Path.of("/proc/mounts"))) {
+            return lines.anyMatch(x -> x.split(" ")[1].equals("/mnt/scratch"));
+        } catch (IOException e) {
+            return false;
+        }
+    }
 }

app/src/main/res/values/strings.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-     Copyright (C) 2017-2023 The LineageOS Project
+     Copyright (C) 2017-2024 The LineageOS Project
 
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
@@ -60,6 +60,15 @@
     <string name="dialog_prepare_zip_message">Preliminary update preparation</string>
     <string name="dialog_battery_low_title">Low battery</string>
     <string name="dialog_battery_low_message_pct">The battery level is too low, you need at least <xliff:g id="percent_discharging">%1$d</xliff:g>%% of the battery to continue, <xliff:g id="percent_charging">%2$d</xliff:g>%% if charging.</string>
+    <string name="dialog_scratch_mounted_message">
+        <![CDATA[
+        Please run the following commands and retry the update:\n
+        • adb root\n
+        • adb enable-verity\n
+        • adb reboot
+        ]]>
+    </string>
+    <string name="dialog_scratch_mounted_title">Cannot install update with OverlayFS mounted</string>
 
     <string name="reboot">Reboot</string>