--- a/src/share/demo/nio/zipfs/src/com/sun/nio/zipfs/ZipFileSystem.java	Wed May 06 21:01:10 2020 +0200
+++ b/src/share/demo/nio/zipfs/src/com/sun/nio/zipfs/ZipFileSystem.java	Tue May 19 03:09:58 2020 +0100
@@ -1105,9 +1105,7 @@
 
     // Creates a new empty temporary file in the same directory as the
     // specified file.  A variant of Files.createTempFile.
-    private Path createTempFileInSameDirectoryAs(Path path)
-        throws IOException
-    {
+    private Path createTempFileInSameDirectoryAs(Path path) throws IOException {
         Path parent = path.toAbsolutePath().getParent();
         Path dir = (parent == null) ? path.getFileSystem().getPath(".") : parent;
         Path tmpPath = Files.createTempFile(dir, "zipfstmp", null);
@@ -1213,6 +1211,7 @@
         }
         if (!hasUpdate)
             return;
+        PosixFileAttributes attrs = getPosixAttributes(zfpath);
         Path tmpFile = createTempFileInSameDirectoryAs(zfpath);
         try (OutputStream os = new BufferedOutputStream(Files.newOutputStream(tmpFile, WRITE)))
         {
@@ -1313,6 +1312,11 @@
             Files.delete(zfpath);
         }
 
+        // Set the POSIX permissions of the original Zip File if available
+        // before moving the temp file
+        if (attrs != null) {
+            Files.setPosixFilePermissions(tmpFile, attrs.permissions());
+        }
         Files.move(tmpFile, zfpath, REPLACE_EXISTING);
         hasUpdate = false;    // clear
         /*
@@ -1324,6 +1328,29 @@
         //System.out.printf("->sync(%s) done!%n", toString());
     }
 
+    /**
+     * Returns a file's POSIX file attributes.
+     * @param path The path to the file
+     * @return The POSIX file attributes for the specified file or
+     *         null if the POSIX attribute view is not available
+     * @throws IOException If an error occurs obtaining the POSIX attributes for
+     *                    the specified file
+     */
+    private PosixFileAttributes getPosixAttributes(Path path) throws IOException {
+        try {
+            PosixFileAttributeView view =
+                    Files.getFileAttributeView(path, PosixFileAttributeView.class);
+            // Return if the attribute view is not supported
+            if (view == null) {
+                return null;
+            }
+            return view.readAttributes();
+        } catch (UnsupportedOperationException e) {
+            // PosixFileAttributes not available
+            return null;
+        }
+    }
+
     private IndexNode getInode(byte[] path) {
         if (path == null)
             throw new NullPointerException("path");

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/demo/zipfs/ZipFSPermissionsTest.java	Tue May 19 03:09:58 2020 +0100
@@ -0,0 +1,234 @@
+/*
+ * Copyright (c) 2019, 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.
+ *
+ * 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.
+ *
+ */
+
+import org.testng.SkipException;
+import org.testng.annotations.*;
+
+import java.io.IOException;
+import java.net.URI;
+import java.nio.file.FileSystem;
+import java.nio.file.FileSystems;
+import java.nio.file.spi.FileSystemProvider;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.attribute.PosixFileAttributeView;
+import java.nio.file.attribute.PosixFileAttributes;
+import java.nio.file.attribute.PosixFilePermission;
+import java.nio.file.attribute.PosixFilePermissions;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.LinkedHashSet;
+import java.util.Map;
+import java.util.Set;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+import static java.nio.file.attribute.PosixFilePermission.*;
+import static org.testng.Assert.assertEquals;
+
+/**
+ * @test
+ * @bug 8229888
+ * @summary Updating an existing zip file does not preserve original permissions
+ * @modules jdk.zipfs
+ * @run testng/othervm ZipFSPermissionsTest
+ * @run testng/othervm/java.security.policy=ZipFSPermissionsTest.policy ZipFSPermissionsTest
+ */
+public class ZipFSPermissionsTest {
+
+    // Files used for testing
+    private static final Path zipFile = Paths.get("zipPermsTest.zip");
+    private static final Path entry0 = Paths.get("Entry-0.txt");
+    // Path of 2nd file to add to the Zip file
+    private static final Path entry1 = Paths.get("Entry-1.txt");
+
+    // Enable for permissions output
+    private static final boolean DEBUG = false;
+
+    /**
+     * Create the files used by the test
+     */
+    @BeforeSuite
+    public void setUp() throws Exception {
+        boolean supportsPosix = FileSystems.getDefault()
+                .supportedFileAttributeViews().contains("posix");
+
+        // Check to see if File System supports POSIX permissions
+        if (supportsPosix) {
+            System.out.println("File Store Supports Posix");
+        } else {
+            // As there is no POSIX permission support, skip running the test
+            throw new SkipException("Cannot set permissions on this File Store");
+        }
+        Files.write(entry0, "Tennis Pro".getBytes(UTF_8));
+        Files.write(entry1, "Tennis is a lifetime sport!".getBytes(UTF_8));
+    }
+
+    /**
+     * Re-create the initial Zip file prior to each run.
+     */
+    @BeforeMethod
+    public void before() throws Exception {
+        Files.deleteIfExists(zipFile);
+        zip(zipFile, Collections.singletonMap("create", "true"), entry0);
+    }
+
+    /**
+     * Remove Zip file used by test after each run.
+     */
+    @AfterMethod
+    public void tearDown() throws Exception {
+        Files.deleteIfExists(zipFile);
+    }
+
+    /**
+     * Remove files used by test as part of final test run clean-up
+     */
+    @AfterSuite
+    public void suiteCleanUp() throws Exception {
+        Files.deleteIfExists(zipFile);
+        Files.deleteIfExists(entry0);
+        Files.deleteIfExists(entry1);
+    }
+
+    /**
+     * Validate that the Zip file permissions are as expected after updating the
+     * Zip file
+     * @param newPerms The permissions to set on the Zip File before updating the
+     *                 file
+     * @throws Exception If an error occurs
+     */
+    @Test(dataProvider = "posixPermissions")
+    public void testZipPerms(Set<PosixFilePermission> newPerms) throws Exception {
+        if (DEBUG) {
+            System.out.printf("Test Run with perms= %s%n", newPerms);
+        }
+
+        PosixFileAttributes attrs = getPosixAttributes(zipFile);
+
+        // Permissions used to verify the results of updating the Zip file
+        if (newPerms == null) {
+            // Use current Zip File permissions;
+            newPerms = attrs.permissions();
+        }
+        displayPermissions("Original permissions", zipFile);
+
+        // Now set the new permissions
+        Files.setPosixFilePermissions(zipFile, newPerms);
+        displayPermissions("Revised permissions", zipFile);
+
+        // Update the Zip file
+        zip(zipFile, Collections.emptyMap(), entry1);
+
+        // Validate that the permissions are as expected after updating the
+        // Zip file
+        PosixFileAttributes afterAttrs = getPosixAttributes(zipFile);
+        displayPermissions("Permissions after updating the Zip File", zipFile);
+        assertEquals(afterAttrs.permissions(), newPerms,
+                "Permissions were not updated as expected!");
+    }
+
+    /**
+     * Display the permissions for the specified Zip file when {@code DEBUG}
+     * is set to {@code true}
+     *
+     * @param msg     String to include in the message
+     * @param zipFile Path to the Zip File
+     * @throws IOException If an error occurs obtaining the permissions
+     */
+    public void displayPermissions(String msg, Path zipFile) throws IOException {
+        if (DEBUG) {
+            PosixFileAttributeView view = Files.getFileAttributeView(zipFile,
+                    PosixFileAttributeView.class);
+            if (view == null) {
+                System.out.println("Could not obtain a PosixFileAttributeView!");
+                return;
+            }
+            PosixFileAttributes attrs = view.readAttributes();
+            System.out.printf("%s: %s, Owner: %s, Group:%s, permissions: %s%n", msg,
+                    zipFile.getFileName(), attrs.owner().getName(),
+                    attrs.group().getName(), PosixFilePermissions.toString(attrs.permissions()));
+        }
+    }
+
+    /**
+     * Create a Zip File System using the specified properties and a Zip file
+     * with the specified number of entries
+     *
+     * @param zipFile Path to the Zip File to create/update
+     * @param env     Properties used for creating the Zip Filesystem
+     * @param source  The path of the file to add to the Zip File
+     * @throws Exception If an error occurs while creating/updating the Zip file
+     */
+    public void zip(Path zipFile, Map<String, String> env, Path source) throws Exception {
+        if (DEBUG) {
+            System.out.printf("File:%s, adding:%s%n", zipFile.toAbsolutePath(), source);
+        }
+        try (FileSystem zipfs = FileSystems.newFileSystem(new URI("jar", zipFile.toUri().toString(), null), env)) {
+            Files.copy(source, zipfs.getPath(source.getFileName().toString()));
+        }
+    }
+
+    /**
+     * Returns a file's POSIX file attributes.
+     *
+     * @param path The path to the Zip file
+     * @return The POSIX file attributes for the specified file or
+     * null if the  POSIX attribute view is not available
+     * @throws IOException If an error occurs obtaining the POSIX attributes for
+     *                     the specified file
+     */
+    public PosixFileAttributes getPosixAttributes(Path path) throws IOException {
+        PosixFileAttributes attrs = null;
+            PosixFileAttributeView view =
+                    Files.getFileAttributeView(path, PosixFileAttributeView.class);
+            // Return if the attribute view is not supported
+            if (view == null) {
+                return null;
+            }
+            attrs = view.readAttributes();
+        return attrs;
+    }
+
+    /*
+     * DataProvider used to verify the permissions on a Zip file
+     * are as expected after updating the Zip file
+     */
+    @DataProvider(name = "posixPermissions")
+    private Object[][] posixPermissions() {
+        return new Object[][]{
+                {null},
+                {new LinkedHashSet<>(Arrays.asList(OWNER_READ, OWNER_WRITE, OTHERS_READ))},
+                {new LinkedHashSet<>(Arrays.asList(OWNER_READ, OWNER_WRITE, OWNER_EXECUTE))},
+                {new LinkedHashSet<>(Arrays.asList(OWNER_READ, OWNER_WRITE, OTHERS_READ, OTHERS_WRITE))},
+                {new LinkedHashSet<>(Arrays.asList(OWNER_READ, OWNER_WRITE, OWNER_EXECUTE, OTHERS_READ,
+                        OTHERS_WRITE, OTHERS_EXECUTE))},
+                {new LinkedHashSet<>(Arrays.asList(OWNER_READ, OWNER_WRITE, OWNER_EXECUTE,
+                        GROUP_READ, GROUP_WRITE,GROUP_EXECUTE, OTHERS_READ,
+                        OTHERS_WRITE, OTHERS_EXECUTE))},
+                {new LinkedHashSet<>(Arrays.asList(OWNER_READ, OWNER_WRITE, GROUP_READ, GROUP_WRITE,
+                        OTHERS_READ, OTHERS_WRITE))},
+        };
+    }
+ }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/demo/zipfs/ZipFSPermissionsTest.policy	Tue May 19 03:09:58 2020 +0100
@@ -0,0 +1,5 @@
+grant {
+    permission java.io.FilePermission "<<ALL FILES>>","read,write,delete";
+    permission java.util.PropertyPermission "user.dir","read";
+    permission java.lang.RuntimePermission "accessUserInformation";
+};