Remove assumptions from BootInfo and move them to the DSL extension

spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/SpringBootExtension.java

@@ -16,9 +16,15 @@
 
 package org.springframework.boot.gradle;
 
+import java.io.File;
+import java.util.concurrent.Callable;
+
 import org.gradle.api.Action;
 import org.gradle.api.Project;
 import org.gradle.api.plugins.JavaPlugin;
+import org.gradle.api.plugins.JavaPluginConvention;
+import org.gradle.api.tasks.SourceSet;
+import org.gradle.api.tasks.bundling.Jar;
 
 import org.springframework.boot.gradle.buildinfo.BuildInfo;
 
@@ -43,7 +49,11 @@ public class SpringBootExtension {
 
 	/**
 	 * Creates a new {@link BuildInfo} task named {@code bootBuildInfo} and configures the
-	 * {@code classes} task to depend upon it.
+	 * Java plugin's {@code classes} task to depend upon it.
+	 * <p>
+	 * By default, the task's destination dir will be a directory named {@code META-INF}
+	 * beneath the main source set's resources output directory, and the task's project
+	 * artifact will be the base name of the {@code bootWar} or {@code bootJar} task.
 	 */
 	public void buildInfo() {
 		this.buildInfo(null);
@@ -51,16 +61,39 @@ public class SpringBootExtension {
 
 	/**
 	 * Creates a new {@link BuildInfo} task named {@code bootBuildInfo} and configures the
-	 * {@code classes} task to depend upon it. The task is passed to the given
-	 * {@code configurer} for further configuration.
+	 * Java plugin's {@code classes} task to depend upon it. The task is passed to the
+	 * given {@code configurer} for further configuration.
+	 * <p>
+	 * By default, the task's destination dir will be a directory named {@code META-INF}
+	 * beneath the main source set's resources output directory, and the task's project
+	 * artifact will be the base name of the {@code bootWar} or {@code bootJar} task.
 	 *
 	 * @param configurer the task configurer
 	 */
 	public void buildInfo(Action<BuildInfo> configurer) {
 		BuildInfo bootBuildInfo = this.project.getTasks().create("bootBuildInfo",
 				BuildInfo.class);
+		this.project.getPlugins().withType(JavaPlugin.class, (plugin) -> {
 			this.project.getTasks().getByName(JavaPlugin.CLASSES_TASK_NAME)
 					.dependsOn(bootBuildInfo);
+			bootBuildInfo.getConventionMapping().map("projectArtifact",
+					(Callable<String>) () -> {
+				Jar artifactTask = (Jar) this.project.getTasks().findByName("bootWar");
+				if (artifactTask == null) {
+					artifactTask = (Jar) this.project.getTasks().findByName("bootJar");
+				}
+				String result = artifactTask == null ? null : artifactTask.getBaseName();
+				return result;
+			});
+			bootBuildInfo.getConventionMapping().map("destinationDir",
+					(Callable<File>) () -> {
+				return new File(
+						this.project.getConvention().getPlugin(JavaPluginConvention.class)
+								.getSourceSets().getByName(SourceSet.MAIN_SOURCE_SET_NAME)
+								.getOutput().getResourcesDir(),
+						"META-INF");
+			});
+		});
 		if (configurer != null) {
 			configurer.execute(bootBuildInfo);
 		}

spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/buildinfo/BuildInfo.java

@@ -22,55 +22,45 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.Map.Entry;
 
-import org.gradle.api.DefaultTask;
-import org.gradle.api.plugins.JavaPlugin;
+import org.gradle.api.Task;
+import org.gradle.api.internal.ConventionTask;
 import org.gradle.api.tasks.Input;
-import org.gradle.api.tasks.OutputFile;
+import org.gradle.api.tasks.OutputDirectory;
 import org.gradle.api.tasks.TaskAction;
 import org.gradle.api.tasks.TaskExecutionException;
-import org.gradle.api.tasks.bundling.Jar;
 
 import org.springframework.boot.loader.tools.BuildPropertiesWriter;
 import org.springframework.boot.loader.tools.BuildPropertiesWriter.ProjectDetails;
 
 /**
- * {@link DefaultTask} for generating a {@code build-info.properties} file from a
- * {@code Project}.
- * <p>
- * By default, the {@code build-info.properties} file is generated in
- * project.buildDir/resources/main/META-INF.
- * </p>
+ * {@link Task} for generating a {@code build-info.properties} file from a
+ * {@code Project}. The {@link #setDestinationDir destination dir} and
+ * {@link #setProjectArtifact project artifact} must be configured before execution.
  *
  * @author Andy Wilkinson
  */
-public class BuildInfo extends DefaultTask {
+public class BuildInfo extends ConventionTask {
 
-	@OutputFile
-	private File outputFile = getProject().file(new File(getProject().getBuildDir(),
-			"resources/main/META-INF/build-info.properties"));
+	private File destinationDir;
 
-	@Input
 	private String projectGroup = getProject().getGroup().toString();
 
-	@Input
-	private String projectArtifact = ((Jar) getProject().getTasks()
-			.getByName(JavaPlugin.JAR_TASK_NAME)).getBaseName();
+	private String projectArtifact;
 
-	@Input
 	private String projectVersion = getProject().getVersion().toString();
 
-	@Input
 	private String projectName = getProject().getName();
 
-	@Input
 	private Map<String, Object> additionalProperties = new HashMap<>();
 
 	@TaskAction
 	public void generateBuildProperties() {
 		try {
-			new BuildPropertiesWriter(this.outputFile)
+			new BuildPropertiesWriter(
+					new File(getDestinationDir(), "build-info.properties"))
 							.writeBuildProperties(new ProjectDetails(this.projectGroup,
-							this.projectArtifact, this.projectVersion, this.projectName,
+									getProjectArtifact(), this.projectVersion,
+									this.projectName,
 									coerceToStringValues(this.additionalProperties)));
 		}
 		catch (IOException ex) {
@@ -78,6 +68,7 @@ public class BuildInfo extends DefaultTask {
 		}
 	}
 
+	@Input
 	public String getProjectGroup() {
 		return this.projectGroup;
 	}
@@ -86,6 +77,7 @@ public class BuildInfo extends DefaultTask {
 		this.projectGroup = projectGroup;
 	}
 
+	@Input
 	public String getProjectArtifact() {
 		return this.projectArtifact;
 	}
@@ -94,6 +86,7 @@ public class BuildInfo extends DefaultTask {
 		this.projectArtifact = projectArtifact;
 	}
 
+	@Input
 	public String getProjectVersion() {
 		return this.projectVersion;
 	}
@@ -102,6 +95,7 @@ public class BuildInfo extends DefaultTask {
 		this.projectVersion = projectVersion;
 	}
 
+	@Input
 	public String getProjectName() {
 		return this.projectName;
 	}
@@ -110,14 +104,16 @@ public class BuildInfo extends DefaultTask {
 		this.projectName = projectName;
 	}
 
-	public File getOutputFile() {
-		return this.outputFile;
+	@OutputDirectory
+	public File getDestinationDir() {
+		return this.destinationDir;
 	}
 
-	public void setOutputFile(File outputFile) {
-		this.outputFile = outputFile;
+	public void setDestinationDir(File destinationDir) {
+		this.destinationDir = destinationDir;
 	}
 
+	@Input
 	public Map<String, Object> getAdditionalProperties() {
 		return this.additionalProperties;
 	}

spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/buildinfo/BuildInfoDslIntegrationTests.java

@@ -0,0 +1,128 @@
+/*
+ * Copyright 2012-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.gradle.buildinfo;
+
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.Properties;
+
+import org.gradle.testkit.runner.TaskOutcome;
+import org.junit.Rule;
+import org.junit.Test;
+
+import org.springframework.boot.gradle.testkit.GradleBuild;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Integration tests for {@link BuildInfo} created using the
+ * {@link org.springframework.boot.gradle.SpringBootExtension DSL}.
+ *
+ * @author Andy Wilkinson
+ */
+public class BuildInfoDslIntegrationTests {
+
+	@Rule
+	public final GradleBuild gradleBuild = new GradleBuild();
+
+	@Test
+	public void basicJar() throws IOException {
+		assertThat(this.gradleBuild.build("bootBuildInfo", "--stacktrace")
+				.task(":bootBuildInfo").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		Properties properties = buildInfoProperties();
+		assertThat(properties).containsEntry("build.name",
+				this.gradleBuild.getProjectDir().getName());
+		assertThat(properties).containsEntry("build.artifact",
+				this.gradleBuild.getProjectDir().getName());
+		assertThat(properties).containsEntry("build.group", "com.example");
+		assertThat(properties).containsEntry("build.version", "1.0");
+	}
+
+	@Test
+	public void jarWithCustomName() throws IOException {
+		assertThat(this.gradleBuild.build("bootBuildInfo", "--stacktrace")
+				.task(":bootBuildInfo").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		Properties properties = buildInfoProperties();
+		assertThat(properties).containsEntry("build.name",
+				this.gradleBuild.getProjectDir().getName());
+		assertThat(properties).containsEntry("build.artifact", "foo");
+		assertThat(properties).containsEntry("build.group", "com.example");
+		assertThat(properties).containsEntry("build.version", "1.0");
+	}
+
+	@Test
+	public void basicWar() throws IOException {
+		assertThat(this.gradleBuild.build("bootBuildInfo", "--stacktrace")
+				.task(":bootBuildInfo").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		Properties properties = buildInfoProperties();
+		assertThat(properties).containsEntry("build.name",
+				this.gradleBuild.getProjectDir().getName());
+		assertThat(properties).containsEntry("build.artifact",
+				this.gradleBuild.getProjectDir().getName());
+		assertThat(properties).containsEntry("build.group", "com.example");
+		assertThat(properties).containsEntry("build.version", "1.0");
+	}
+
+	@Test
+	public void warWithCustomName() throws IOException {
+		assertThat(this.gradleBuild.build("bootBuildInfo", "--stacktrace")
+				.task(":bootBuildInfo").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		Properties properties = buildInfoProperties();
+		assertThat(properties).containsEntry("build.name",
+				this.gradleBuild.getProjectDir().getName());
+		assertThat(properties).containsEntry("build.artifact", "foo");
+		assertThat(properties).containsEntry("build.group", "com.example");
+		assertThat(properties).containsEntry("build.version", "1.0");
+	}
+
+	@Test
+	public void additionalProperties() throws IOException {
+		assertThat(this.gradleBuild.build("bootBuildInfo", "--stacktrace")
+				.task(":bootBuildInfo").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		Properties properties = buildInfoProperties();
+		assertThat(properties).containsEntry("build.name",
+				this.gradleBuild.getProjectDir().getName());
+		assertThat(properties).containsEntry("build.artifact",
+				this.gradleBuild.getProjectDir().getName());
+		assertThat(properties).containsEntry("build.group", "com.example");
+		assertThat(properties).containsEntry("build.version", "1.0");
+		assertThat(properties).containsEntry("build.a", "alpha");
+		assertThat(properties).containsEntry("build.b", "bravo");
+	}
+
+	@Test
+	public void classesDependency() throws IOException {
+		assertThat(this.gradleBuild.build("classes", "--stacktrace")
+				.task(":bootBuildInfo").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+	}
+
+	private Properties buildInfoProperties() {
+		File file = new File(this.gradleBuild.getProjectDir(),
+				"build/resources/main/META-INF/build-info.properties");
+		assertThat(file).isFile();
+		Properties properties = new Properties();
+		try (FileReader reader = new FileReader(file)) {
+			properties.load(reader);
+			return properties;
+		}
+		catch (IOException ex) {
+			throw new RuntimeException(ex);
+		}
+	}
+
+}

spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/buildinfo/BuildInfoIntegrationTests.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2012-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.gradle.buildinfo;
+
+import org.gradle.testkit.runner.TaskOutcome;
+import org.junit.Rule;
+import org.junit.Test;
+
+import org.springframework.boot.gradle.testkit.GradleBuild;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Integration tests for {@link BuildInfo}.
+ *
+ * @author Andy Wilkinson
+ */
+public class BuildInfoIntegrationTests {
+
+	@Rule
+	public final GradleBuild gradleBuild = new GradleBuild();
+
+	@Test
+	public void basicExecution() {
+		assertThat(this.gradleBuild.build("buildInfo").task(":buildInfo").getOutcome())
+				.isEqualTo(TaskOutcome.SUCCESS);
+	}
+
+	@Test
+	public void upToDateWhenExecutedTwice() {
+		assertThat(this.gradleBuild.build("buildInfo").task(":buildInfo").getOutcome())
+				.isEqualTo(TaskOutcome.SUCCESS);
+		assertThat(this.gradleBuild.build("buildInfo").task(":buildInfo").getOutcome())
+				.isEqualTo(TaskOutcome.UP_TO_DATE);
+	}
+
+	@Test
+	public void notUpToDateWhenDestinationDirChanges() {
+		notUpToDateWithChangeToProperty("buildInfoDestinationDir");
+	}
+
+	@Test
+	public void notUpToDateWhenProjectArtifactChanges() {
+		notUpToDateWithChangeToProperty("buildInfoProjectArtifact");
+	}
+
+	@Test
+	public void notUpToDateWhenProjectGroupChanges() {
+		notUpToDateWithChangeToProperty("buildInfoProjectGroup");
+	}
+
+	@Test
+	public void notUpToDateWhenProjectVersionChanges() {
+		notUpToDateWithChangeToProperty("buildInfoProjectVersion");
+	}
+
+	@Test
+	public void notUpToDateWhenProjectNameChanges() {
+		notUpToDateWithChangeToProperty("buildInfoProjectName");
+	}
+
+	@Test
+	public void notUpToDateWhenAdditionalPropertyChanges() {
+		notUpToDateWithChangeToProperty("buildInfoAdditionalProperty");
+	}
+
+	private void notUpToDateWithChangeToProperty(String name) {
+		assertThat(this.gradleBuild.build("buildInfo").task(":buildInfo").getOutcome())
+				.isEqualTo(TaskOutcome.SUCCESS);
+		assertThat(this.gradleBuild.build("buildInfo", "-P" + name + "=changed")
+				.task(":buildInfo").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+	}
+
+}

spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/buildinfo/BuildInfoDslIntegrationTests-additionalProperties.gradle

@@ -0,0 +1,17 @@
+buildscript {
+	dependencies {
+		classpath files(pluginClasspath.split(','))
+	}
+}
+
+apply plugin: 'org.springframework.boot'
+apply plugin: 'java'
+
+group = 'com.example'
+version = '1.0'
+
+springBoot {
+	buildInfo {
+		additionalProperties 'a': 'alpha', 'b': 'bravo'
+	}
+}

spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/buildinfo/BuildInfoDslIntegrationTests-basicJar.gradle

@@ -0,0 +1,15 @@
+buildscript {
+	dependencies {
+		classpath files(pluginClasspath.split(','))
+	}
+}
+
+apply plugin: 'org.springframework.boot'
+apply plugin: 'java'
+
+group = 'com.example'
+version = '1.0'
+
+springBoot {
+	buildInfo()
+}

spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/buildinfo/BuildInfoDslIntegrationTests-basicWar.gradle

@@ -0,0 +1,15 @@
+buildscript {
+	dependencies {
+		classpath files(pluginClasspath.split(','))
+	}
+}
+
+apply plugin: 'org.springframework.boot'
+apply plugin: 'war'
+
+group = 'com.example'
+version = '1.0'
+
+springBoot {
+	buildInfo()
+}

spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/buildinfo/BuildInfoDslIntegrationTests-classesDependency.gradle

@@ -0,0 +1,12 @@
+buildscript {
+	dependencies {
+		classpath files(pluginClasspath.split(','))
+	}
+}
+
+apply plugin: 'org.springframework.boot'
+apply plugin: 'java'
+
+springBoot {
+	buildInfo()
+}

spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/buildinfo/BuildInfoDslIntegrationTests-jarWithCustomName.gradle

@@ -0,0 +1,19 @@
+buildscript {
+	dependencies {
+		classpath files(pluginClasspath.split(','))
+	}
+}
+
+apply plugin: 'org.springframework.boot'
+apply plugin: 'java'
+
+group = 'com.example'
+version = '1.0'
+
+bootJar {
+	baseName = 'foo'
+}
+
+springBoot {
+	buildInfo()
+}

spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/buildinfo/BuildInfoDslIntegrationTests-warWithCustomName.gradle

@@ -0,0 +1,19 @@
+buildscript {
+	dependencies {
+		classpath files(pluginClasspath.split(','))
+	}
+}
+
+apply plugin: 'org.springframework.boot'
+apply plugin: 'war'
+
+group = 'com.example'
+version = '1.0'
+
+bootWar {
+	baseName = 'foo'
+}
+
+springBoot {
+	buildInfo()
+}

spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/buildinfo/BuildInfoIntegrationTests.gradle

@@ -0,0 +1,18 @@
+buildscript {
+	dependencies {
+		classpath files(pluginClasspath.split(','))
+	}
+}
+
+def property(String name, Object defaultValue) {
+	project.hasProperty(name) ? project.getProperty(name) : defaultValue
+}
+
+task buildInfo(type: org.springframework.boot.gradle.buildinfo.BuildInfo) {
+	destinationDir file(property('buildInfoDestinationDir', project.buildDir))
+	projectArtifact property('buildInfoProjectArtifact', 'foo')
+	projectVersion property('buildInfoProjectVersion', '1.0')
+	projectGroup property('buildInfoProjectGroup', 'foo')
+	projectName property('buildInfoProjectName', 'foo')
+	additionalProperties 'additional': property('buildInfoAdditionalProperty', 'foo')
+}