8238953: tools/jpackage tests do not work on Ubuntu Linux

Reviewed-by: asemenyuk, clanger

Author: MBaesken

test/jdk/tools/jpackage/helpers/jdk/jpackage/test/PackageType.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2019, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -117,9 +117,8 @@ private static boolean isBundlerSupported(String bundlerClass) {
             MAC.stream()).collect(Collectors.toUnmodifiableSet());
 
     private final static class Inner {
-
         private final static Set<String> DISABLED_PACKAGERS = Optional.ofNullable(
                 TKit.tokenizeConfigProperty("disabledPackagers")).orElse(
-                Collections.emptySet());
+                TKit.isUbuntu() ? Set.of("rpm") : Collections.emptySet());
     }
 }

test/jdk/tools/jpackage/helpers/jdk/jpackage/test/TKit.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2019, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -22,7 +22,10 @@
  */
 package jdk.jpackage.test;
 
+import java.io.BufferedReader;
+import java.io.File;
 import java.io.FileOutputStream;
+import java.io.FileReader;
 import java.io.IOException;
 import java.io.PrintStream;
 import java.lang.reflect.InvocationTargetException;
@@ -178,6 +181,27 @@ public static boolean isLinux() {
         return ((OS.contains("nix") || OS.contains("nux")));
     }
 
+    public static boolean isUbuntu() {
+        if (!isLinux()) {
+            return false;
+        }
+        File releaseFile = new File("/etc/os-release");
+        if (releaseFile.exists()) {
+            try (BufferedReader lineReader = new BufferedReader(new FileReader(releaseFile))) {
+                String lineText = null;
+                while ((lineText = lineReader.readLine()) != null) {
+                    if (lineText.indexOf("NAME=\"Ubuntu") != -1) {
+                        lineReader.close();
+                        return true;
+                    }
+                }
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+        return false;
+    }
+
     static void log(String v) {
         System.out.println(v);
         if (extraLogStream != null) {