Set filtered jar's manifest time to epoch

(cherry picked from commit a7aa354)

Author: Malandril

core/deployment/src/main/java/io/quarkus/deployment/pkg/steps/JarResultBuildStep.java

@@ -1290,7 +1290,13 @@ static void filterJarFile(Path resolvedDep, Path targetPath, Set<String> transfo
                 } else {
                     manifest = new Manifest();
                 }
-                try (JarOutputStream out = new JarOutputStream(Files.newOutputStream(targetPath), manifest)) {
+                try (JarOutputStream out = new JarOutputStream(Files.newOutputStream(targetPath))) {
+                    JarEntry manifestEntry = new JarEntry(JarFile.MANIFEST_NAME);
+                    // Set manifest time to epoch to always make the same jar
+                    manifestEntry.setTime(0);
+                    out.putNextEntry(manifestEntry);
+                    manifest.write(out);
+                    out.closeEntry();
                     Enumeration<JarEntry> entries = in.entries();
                     while (entries.hasMoreElements()) {
                         JarEntry entry = entries.nextElement();
@@ -1306,6 +1312,8 @@ static void filterJarFile(Path resolvedDep, Path targetPath, Set<String> transfo
                                 while ((r = inStream.read(buffer)) > 0) {
                                     out.write(buffer, 0, r);
                                 }
+                            } finally {
+                                out.closeEntry();
                             }
                         } else {
                             log.debugf("Removed %s from %s", entryName, resolvedDep);

core/deployment/src/test/java/io/quarkus/deployment/pkg/steps/JarResultBuildStepTest.java

@@ -68,6 +68,26 @@ void should_unsign_jar_when_filtered(@TempDir Path tempDir) throws Exception {
         }
     }
 
+    @Test
+    void manifestTimeShouldAlwaysBeSetToEpoch(@TempDir Path tempDir) throws Exception {
+        JavaArchive archive = ShrinkWrap.create(JavaArchive.class, "myarchive.jar")
+                .addClasses(Integer.class)
+                .addManifest();
+        Path initialJar = tempDir.resolve("initial.jar");
+        Path filteredJar = tempDir.resolve("filtered.jar");
+        archive.as(ZipExporter.class).exportTo(new File(initialJar.toUri()), true);
+        JarResultBuildStep.filterJarFile(initialJar, filteredJar, Set.of("java/lang/Integer.class"));
+        try (JarFile jarFile = new JarFile(filteredJar.toFile())) {
+            assertThat(jarFile.stream())
+                    .filteredOn(jarEntry -> jarEntry.getName().equals(JarFile.MANIFEST_NAME))
+                    .isNotEmpty()
+                    .allMatch(jarEntry -> jarEntry.getTime() == 0);
+            // Check that the manifest is still has attributes
+            Manifest manifest = jarFile.getManifest();
+            assertThat(manifest.getMainAttributes()).isNotEmpty();
+        }
+    }
+
     private static KeyStore.PrivateKeyEntry createPrivateKeyEntry()
             throws NoSuchAlgorithmException, CertificateException, OperatorCreationException, CertIOException {
         KeyPairGenerator ky = KeyPairGenerator.getInstance("RSA");