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

*** 722,731 ****
--- 722,751 ----
          }
          return ThrowingFunction.toFunction(CfgFile::readFromFile).apply(
                  appLauncherCfgPath(launcherName));
      }
  
+     public List<String> readRuntimeReleaseFile() {
+         return readRuntimeReleaseFile(null);
+     }
+ 
+     public List<String> readRuntimeReleaseFile(String launcherName) {
+         verifyIsOfType(PackageType.IMAGE);
+         if (isRuntime()) {
+             return null;
+         }
+         if (launcherName == null) {
+             launcherName = name();
+         }
+         Path release = appRuntimeDirectory().resolve("release");
+         try {
+             return Files.readAllLines(release);
+         } catch (IOException ioe) {
+             throw new RuntimeException(ioe);
+         }
+     }
+ 
      public static String escapeAndJoin(String... args) {
          return escapeAndJoin(List.of(args));
      }
  
      public static String escapeAndJoin(List<String> args) {