--- /dev/null	2018-10-22 10:39:20.000000000 -0400
+++ new/src/jdk.packager/share/classes/jdk/packager/internal/RedistributableModules.java	2018-10-22 10:39:18.308351900 -0400
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2015, 2018, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.packager.internal;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.UnsupportedEncodingException;
+import java.util.Optional;
+import java.lang.module.ModuleDescriptor;
+import java.lang.module.ModuleFinder;
+import java.lang.module.ModuleReference;
+import java.lang.module.ModuleReader;
+import java.nio.file.Path;
+import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.Set;
+
+import jdk.tools.jlink.internal.packager.AppRuntimeImageBuilder;
+
+public final class RedistributableModules {
+    private static final String JDK_PACKAGER_MODULE = "jdk.packager";
+
+    private RedistributableModules() {}
+
+    public static String stripComments(String line) {
+        String result = line.trim();
+        int i = result.indexOf(";");
+
+        if (i >= 0) {
+          result = result.substring(0, i);
+          result = result.trim();
+        }
+
+        return result;
+    }
+
+    public static Set<String> getRedistributableModules(List<Path> modulePath,
+            String filename) {
+        Set<String> result = null;
+
+        Set<String> addModules = new HashSet<>();
+        Set<String> limitModules = new HashSet<>();
+        ModuleFinder finder = AppRuntimeImageBuilder.moduleFinder(
+                modulePath, addModules, limitModules);
+        Optional<ModuleReference> mref = finder.find(JDK_PACKAGER_MODULE);
+
+        if (mref.isPresent()) {
+            ModuleReader reader = null;
+
+            try {
+                reader = mref.get().open();
+            } catch (NoSuchElementException | IOException ex) {
+            }
+
+            if (reader != null) {
+                Optional<InputStream> stream = null;
+
+                try {
+                    stream = reader.open(filename);
+                } catch (IOException ex) {
+                }
+
+                if (stream != null) {
+                    if (stream.isPresent()) {
+                        BufferedReader br = null;
+
+                        try {
+                            br = new BufferedReader(new InputStreamReader(
+                                    stream.get(), "UTF-8"));
+                        } catch (UnsupportedEncodingException ex) {
+                        }
+
+                        if (br != null) {
+                            result = new LinkedHashSet();
+                            String line;
+
+                            try {
+                                while ((line = br.readLine()) != null) {
+                                    String module = stripComments(line);
+
+                                    if (!module.isEmpty()) {
+                                        result.add(module);
+                                    }
+                                }
+                            } catch (IOException ex) {
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        return result;
+    }
+
+    public static String getModuleVersion(File moduleFile,
+            List<Path> modulePath, Set<String> addModules,
+            Set<String> limitModules) {
+        String result = "";
+
+        ModFile modFile = new ModFile(moduleFile);
+        ModuleFinder finder = AppRuntimeImageBuilder.moduleFinder(modulePath,
+                addModules, limitModules);
+        Optional<ModuleReference> mref = finder.find(modFile.getModName());
+
+        if (mref.isPresent()) {
+            ModuleDescriptor descriptor = mref.get().descriptor();
+
+            if (descriptor != null) {
+                Optional<ModuleDescriptor.Version> version =
+                        descriptor.version();
+
+                if (version.isPresent()) {
+                    result = version.get().toString();
+                }
+            }
+        }
+
+        return result;
+    }
+}