From 0bb9984dfa45ad6b1d559ba010c4f9a0452d7975 Mon Sep 17 00:00:00 2001
From: zzz <zzz@i2pmail.org>
Date: Thu, 12 Jan 2023 06:58:51 -0500
Subject: [PATCH] Util: Add warning about copying router.config to another
 router

---
 core/java/src/net/i2p/data/DataHelper.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/core/java/src/net/i2p/data/DataHelper.java b/core/java/src/net/i2p/data/DataHelper.java
index 21c9036383..4dae9a0cd4 100644
--- a/core/java/src/net/i2p/data/DataHelper.java
+++ b/core/java/src/net/i2p/data/DataHelper.java
@@ -528,6 +528,8 @@ public class DataHelper {
         try {
             fos = new SecureFileOutputStream(tmpFile);
             out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(fos, "UTF-8")));
+            if (file.getName().equals("router.config"))
+                out.println("# WARNING: Do NOT copy this file from one router to another, this may cause serious problems.");
             out.println("# NOTE: This I2P config file must use UTF-8 encoding");
             out.println("# Last saved: " + formatTime(System.currentTimeMillis()));
             for (Map.Entry<Object, Object> entry : props.entrySet()) {
-- 
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