Ensure directories are writable when generating reports from read-only sources

src/core/src/main/java/org/apache/jmeter/report/dashboard/TemplateVisitor.java

@@ -93,6 +93,9 @@ public class TemplateVisitor extends SimpleFileVisitor<Path> {
                             "{}, found non empty folder with following content {}, will be ignored",
                     file, newDir, ex.getMessage(), newDir.toFile().listFiles());
         }
+        if (!newDir.toFile().canWrite()) {
+            newDir.toFile().setWritable(true);
+        }
         return FileVisitResult.CONTINUE;
     }
 

xdocs/changes.xml

@@ -67,6 +67,7 @@ Summary
     <li><pr>6274</pr> Change references to old MySQL driver to new class <code>com.mysql.cj.jdbc.Driver</code></li>
     <li><issue>6352</issue> Calculate delays in Open Model Thread Group and Precise Throughput
         Timer relative to start of Thread Group instead of the start of the test.</li>
+    <li><issue>6357</issue> Ensure writable directories when copying template files while report generation.</li>
   </ul>
 
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