fix (jkube-kit/generator) : Do not add build timestamp to build date …

…label (eclipse-jkube#2393)

We add `org.label-schema.build-date` LABEL to image while creating
opinionated container images. This causes Dockerfile to be different for
every build and it doesn't utilize docker cache properly.

Signed-off-by: Rohan Kumar <rohaan@redhat.com>

CHANGELOG.md

@@ -25,6 +25,10 @@ Usage:
 * Fix #2356: Helm values.yaml parameter names preserve case
 * Fix #2369: Helm chart apiVersion can be configured
 * Fix #2386: Helm icon inferred from annotations in independent resource files (not aggregated kubernetes/openshift.yaml) 
+* Fix #2393: Remove timestamp from `org.label-schema.build-date` LABEL to utilize docker cache
+
+_**Note**_:
+- Container Images generated using jkube opinionated defaults would no longer contain full timestamp in `org.label-schema.build-date` label. It would only contain build date.
 
 ### 1.14.0 (2023-08-31)
 * Fix #1674: SpringBootGenerator utilizes the layered jar if present and use it as Docker layers

jkube-kit/generator/api/src/main/java/org/eclipse/jkube/generator/api/support/BaseGenerator.java

@@ -256,7 +256,7 @@ protected void addSchemaLabels(BuildConfiguration.BuildConfigurationBuilder buil
         String docURL = project.getDocumentationUrl();
         Map<String, String> labels = new HashMap<>();
 
-        labels.put(BuildLabelAnnotations.BUILD_DATE.value(), LocalDateTime.now().toString());
+        labels.put(BuildLabelAnnotations.BUILD_DATE.value(), LocalDateTime.now().toLocalDate().toString());
         labels.put(BuildLabelAnnotations.NAME.value(), project.getName());
         labels.put(BuildLabelAnnotations.DESCRIPTION.value(), project.getDescription());
         if (docURL != null) {

jkube-kit/generator/java-exec/src/test/java/org/eclipse/jkube/generator/javaexec/JavaExecGeneratorTest.java

@@ -14,6 +14,7 @@
 package org.eclipse.jkube.generator.javaexec;
 
 import java.io.File;
+import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -24,6 +25,8 @@
 import org.eclipse.jkube.kit.common.AssemblyConfiguration;
 import org.eclipse.jkube.kit.common.Plugin;
 import org.assertj.core.api.InstanceOfAssertFactories;
+import org.eclipse.jkube.kit.config.image.ImageConfiguration;
+import org.eclipse.jkube.kit.config.image.build.BuildConfiguration;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.mockito.MockedConstruction;
@@ -46,6 +49,7 @@ void setUp() {
     generatorContext = mock(GeneratorContext.class, RETURNS_DEEP_STUBS);
     properties = new Properties();
     plugins = new ArrayList<>();
+    when(generatorContext.getProject().getVersion()).thenReturn("0.0.1");
     when(generatorContext.getProject().getProperties()).thenReturn(properties);
     when(generatorContext.getProject().getPlugins()).thenReturn(plugins);
   }
@@ -120,4 +124,43 @@ void createAssemblyWithFatJarShouldAddDefaultFileSetsAndFatJar() {
           );
     }
   }
+
+  @Test
+  void customize_whenInvoked_shouldAddLabelsToBuildConfiguration() {
+    // Given
+    properties.put("jkube.generator.java-exec.mainClass", "org.example.Foo");
+    JavaExecGenerator javaExecGenerator = new JavaExecGenerator(generatorContext);
+    List<ImageConfiguration> result = new ArrayList<>();
+
+    // When
+    result = javaExecGenerator.customize(result, false);
+
+    // Then
+    assertThat(result)
+        .singleElement(InstanceOfAssertFactories.type(ImageConfiguration.class))
+        .extracting(ImageConfiguration::getBuildConfiguration)
+        .extracting(BuildConfiguration::getLabels)
+        .asInstanceOf(InstanceOfAssertFactories.MAP)
+        .containsKeys("org.label-schema.build-date", "org.label-schema.description", "org.label-schema.version",
+            "org.label-schema.schema-version", "org.label-schema.build-date", "org.label-schema.name");
+  }
+
+  @Test
+  void customize_whenInvoked_shouldNotAddBuildTimestampToBuildDateLabel() {
+    // Given
+    properties.put("jkube.generator.java-exec.mainClass", "org.example.Foo");
+    JavaExecGenerator javaExecGenerator = new JavaExecGenerator(generatorContext);
+    List<ImageConfiguration> result = new ArrayList<>();
+
+    // When
+    result = javaExecGenerator.customize(result, false);
+
+    // Then
+    assertThat(result)
+        .singleElement(InstanceOfAssertFactories.type(ImageConfiguration.class))
+        .extracting(ImageConfiguration::getBuildConfiguration)
+        .extracting(BuildConfiguration::getLabels)
+        .asInstanceOf(InstanceOfAssertFactories.MAP)
+        .containsEntry("org.label-schema.build-date", LocalDateTime.now().toLocalDate().toString());
+  }
 }