Fix reusable archive creation with Gradle 4.1 and later

Closes gh-11468

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/bundling/BootZipCopyAction.java

@@ -20,6 +20,8 @@ import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
+import java.util.Calendar;
+import java.util.GregorianCalendar;
 import java.util.HashSet;
 import java.util.Set;
 import java.util.function.Function;
@@ -39,7 +41,6 @@ import org.gradle.api.internal.file.copy.FileCopyDetailsInternal;
 import org.gradle.api.specs.Spec;
 import org.gradle.api.specs.Specs;
 import org.gradle.api.tasks.WorkResult;
-import org.gradle.util.GUtil;
 
 import org.springframework.boot.loader.tools.DefaultLaunchScript;
 import org.springframework.boot.loader.tools.FileUtils;
@@ -52,6 +53,9 @@ import org.springframework.boot.loader.tools.FileUtils;
  */
 class BootZipCopyAction implements CopyAction {
 
+	private static final long CONSTANT_TIME_FOR_ZIP_ENTRIES = new GregorianCalendar(1980,
+			Calendar.FEBRUARY, 1, 0, 0, 0).getTimeInMillis();
+
 	private final File output;
 
 	private final boolean preserveFileTimestamps;
@@ -158,20 +162,14 @@ class BootZipCopyAction implements CopyAction {
 
 	private void writeDirectory(ZipArchiveEntry entry, ZipArchiveOutputStream out)
 			throws IOException {
-		if (!this.preserveFileTimestamps) {
-			entry.setTime(GUtil.CONSTANT_TIME_FOR_ZIP_ENTRIES);
-		}
-		entry.setUnixMode(UnixStat.DIR_FLAG | UnixStat.DEFAULT_DIR_PERM);
+		prepareEntry(entry, UnixStat.DIR_FLAG | UnixStat.DEFAULT_DIR_PERM);
 		out.putArchiveEntry(entry);
 		out.closeArchiveEntry();
 	}
 
 	private void writeClass(ZipArchiveEntry entry, ZipInputStream in,
 			ZipArchiveOutputStream out) throws IOException {
-		if (!this.preserveFileTimestamps) {
-			entry.setTime(GUtil.CONSTANT_TIME_FOR_ZIP_ENTRIES);
-		}
-		entry.setUnixMode(UnixStat.FILE_FLAG | UnixStat.DEFAULT_FILE_PERM);
+		prepareEntry(entry, UnixStat.FILE_FLAG | UnixStat.DEFAULT_FILE_PERM);
 		out.putArchiveEntry(entry);
 		byte[] buffer = new byte[4096];
 		int read;
@@ -181,6 +179,13 @@ class BootZipCopyAction implements CopyAction {
 		out.closeArchiveEntry();
 	}
 
+	private void prepareEntry(ZipArchiveEntry entry, int unixMode) {
+		if (!this.preserveFileTimestamps) {
+			entry.setTime(CONSTANT_TIME_FOR_ZIP_ENTRIES);
+		}
+		entry.setUnixMode(unixMode);
+	}
+
 	private void writeLaunchScriptIfNecessary(FileOutputStream fileStream) {
 		try {
 			if (this.launchScript != null) {
@@ -280,7 +285,7 @@ class BootZipCopyAction implements CopyAction {
 
 		private long getTime(FileCopyDetails details) {
 			return this.preserveFileTimestamps ? details.getLastModified()
-					: GUtil.CONSTANT_TIME_FOR_ZIP_ENTRIES;
+					: CONSTANT_TIME_FOR_ZIP_ENTRIES;
 		}
 
 	}

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/bundling/AbstractBootArchiveIntegrationTests.java

@@ -29,6 +29,7 @@ import org.junit.runner.RunWith;
 
 import org.springframework.boot.gradle.junit.GradleCompatibilitySuite;
 import org.springframework.boot.gradle.testkit.GradleBuild;
+import org.springframework.boot.loader.tools.FileUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -56,6 +57,21 @@ public abstract class AbstractBootArchiveIntegrationTests {
 				.getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
 	}
 
+	@Test
+	public void reproducibleArchive() throws InvalidRunnerConfigurationException,
+			UnexpectedBuildFailure, IOException, InterruptedException {
+		assertThat(this.gradleBuild.build(this.taskName).task(":" + this.taskName)
+				.getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		File jar = new File(this.gradleBuild.getProjectDir(), "build/libs")
+				.listFiles()[0];
+		String firstHash = FileUtils.sha1Hash(jar);
+		Thread.sleep(1500);
+		assertThat(this.gradleBuild.build("clean", this.taskName)
+				.task(":" + this.taskName).getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		String secondHash = FileUtils.sha1Hash(jar);
+		assertThat(firstHash).isEqualTo(secondHash);
+	}
+
 	@Test
 	public void upToDateWhenBuiltTwice() throws InvalidRunnerConfigurationException,
 			UnexpectedBuildFailure, IOException {

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/bundling/BootJarIntegrationTests-reproducibleArchive.gradle

@@ -0,0 +1,14 @@
+buildscript {
+	dependencies {
+		classpath files(pluginClasspath.split(','))
+	}
+}
+
+apply plugin: 'java'
+apply plugin: 'org.springframework.boot'
+
+bootJar {
+	mainClassName = 'com.example.Application'
+	preserveFileTimestamps = false
+    reproducibleFileOrder = true
+}

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/bundling/BootWarIntegrationTests-reproducibleArchive.gradle

@@ -0,0 +1,14 @@
+buildscript {
+	dependencies {
+		classpath files(pluginClasspath.split(','))
+	}
+}
+
+apply plugin: 'war'
+apply plugin: 'org.springframework.boot'
+
+bootWar {
+	mainClassName = 'com.example.Application'
+	preserveFileTimestamps = false
+    reproducibleFileOrder = true
+}