Introduce build item that gives access to generated k8s resources

extensions/kubernetes/spi/src/main/java/io/quarkus/kubernetes/spi/GeneratedKubernetesResourceBuildItem.java

@@ -0,0 +1,25 @@
+package io.quarkus.kubernetes.spi;
+
+import io.quarkus.builder.item.MultiBuildItem;
+
+/**
+ * Represents a resource generated by the quarkus-kubernetes extension
+ */
+public final class GeneratedKubernetesResourceBuildItem extends MultiBuildItem {
+
+    private final String name;
+    private final byte[] content;
+
+    public GeneratedKubernetesResourceBuildItem(String name, byte[] content) {
+        this.name = name;
+        this.content = content;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public byte[] getContent() {
+        return content;
+    }
+}

extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/KubernetesProcessor.java

@@ -45,6 +45,7 @@
 import io.quarkus.kubernetes.spi.ConfiguratorBuildItem;
 import io.quarkus.kubernetes.spi.CustomProjectRootBuildItem;
 import io.quarkus.kubernetes.spi.DecoratorBuildItem;
+import io.quarkus.kubernetes.spi.GeneratedKubernetesResourceBuildItem;
 import io.quarkus.kubernetes.spi.KubernetesDeploymentTargetBuildItem;
 import io.quarkus.kubernetes.spi.KubernetesPortBuildItem;
 import io.quarkus.runtime.LaunchMode;
@@ -91,7 +92,8 @@ public void build(ApplicationInfoBuildItem applicationInfo,
             List<ConfiguratorBuildItem> configurators,
             List<DecoratorBuildItem> decorators,
             Optional<CustomProjectRootBuildItem> customProjectRoot,
-            BuildProducer<GeneratedFileSystemResourceBuildItem> generatedResourceProducer) {
+            BuildProducer<GeneratedFileSystemResourceBuildItem> generatedResourceProducer,
+            BuildProducer<GeneratedKubernetesResourceBuildItem> generatedKubernetesResourceProducer) {
 
         List<ConfiguratorBuildItem> allConfigurationRegistry = new ArrayList<>(configurators);
         List<DecoratorBuildItem> allDecorators = new ArrayList<>(decorators);
@@ -169,6 +171,9 @@ public void build(ApplicationInfoBuildItem applicationInfo,
                     Path targetPath = outputTarget.getOutputDirectory().resolve(KUBERNETES).resolve(fileName);
                     String relativePath = targetPath.toAbsolutePath().toString().replace(root.toAbsolutePath().toString(), "");
 
+                    generatedKubernetesResourceProducer.produce(new GeneratedKubernetesResourceBuildItem(fileName,
+                            resourceEntry.getValue().getBytes(StandardCharsets.UTF_8)));
+
                     if (fileName.endsWith(".yml") || fileName.endsWith(".json")) {
                         String target = fileName.substring(0, fileName.lastIndexOf("."));
                         if (!deploymentTargets.contains(target)) {

integration-tests/kubernetes/quarkus-standard-way/src/test/java/io/quarkus/it/kubernetes/GeneratedKubernetesResourcesBuildItemTest.java

@@ -0,0 +1,86 @@
+package io.quarkus.it.kubernetes;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.fail;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+
+import org.jboss.shrinkwrap.api.ShrinkWrap;
+import org.jboss.shrinkwrap.api.spec.JavaArchive;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.builder.BuildContext;
+import io.quarkus.deployment.builditem.GeneratedResourceBuildItem;
+import io.quarkus.kubernetes.spi.GeneratedKubernetesResourceBuildItem;
+import io.quarkus.test.ProdBuildResults;
+import io.quarkus.test.ProdModeTestBuildStep;
+import io.quarkus.test.ProdModeTestResults;
+import io.quarkus.test.QuarkusProdModeTest;
+
+public class GeneratedKubernetesResourcesBuildItemTest {
+
+    @RegisterExtension
+    static final QuarkusProdModeTest config = new QuarkusProdModeTest()
+            .setArchiveProducer(() -> ShrinkWrap.create(JavaArchive.class).addClasses(GreetingResource.class))
+            .setApplicationName("basic")
+            .setApplicationVersion("0.1-SNAPSHOT")
+            .addBuildChainCustomizerEntries(new QuarkusProdModeTest.BuildChainCustomizerEntry(
+                    CustomGeneratedKubernetesResourcesHandler.class,
+                    Collections.singletonList(GeneratedResourceBuildItem.class),
+                    Collections.singletonList(GeneratedKubernetesResourceBuildItem.class)));
+
+    @ProdBuildResults
+    private ProdModeTestResults prodModeTestResults;
+
+    @Test
+    public void test() {
+        Path buildDir = prodModeTestResults.getBuildDir();
+        assertThat(buildDir).isDirectory();
+        Path quarkusAppDir = buildDir.resolve("quarkus-app");
+        assertThat(quarkusAppDir).isDirectory();
+        Path quarkusDir = quarkusAppDir.resolve("quarkus");
+        assertThat(quarkusDir).isDirectory();
+        Path generatedBytecodeJar = quarkusDir.resolve("generated-bytecode.jar");
+        assertThat(generatedBytecodeJar).isRegularFile();
+        try (JarFile jarFile = new JarFile(generatedBytecodeJar.toFile())) {
+            assertEntry(jarFile, "dummy-kubernetes.json");
+            assertEntry(jarFile, "dummy-kubernetes.yml");
+        } catch (IOException e) {
+            fail("Unable to verify contents of generated-bytecode jar file: " + e.getMessage());
+        }
+    }
+
+    private void assertEntry(JarFile jarFile, String name) {
+        JarEntry jarEntry = jarFile.getJarEntry(name);
+        if (jarEntry == null) {
+            fail(String.format("Unable to locate expected entry '%s' in generated-bytecode jar", name));
+        }
+    }
+
+    /**
+     * This simulates an extension using {@link GeneratedKubernetesResourceBuildItem}.
+     * It's testable because it writes the contents of each build item to the generate-bytecode jar.
+     */
+    public static class CustomGeneratedKubernetesResourcesHandler extends ProdModeTestBuildStep {
+
+        public CustomGeneratedKubernetesResourcesHandler(Map<String, Object> testContext) {
+            super(testContext);
+        }
+
+        @Override
+        public void execute(BuildContext context) {
+            List<GeneratedKubernetesResourceBuildItem> k8sResources = context
+                    .consumeMulti(GeneratedKubernetesResourceBuildItem.class);
+            for (GeneratedKubernetesResourceBuildItem bi : k8sResources) {
+                context.produce(new GeneratedResourceBuildItem("dummy-" + bi.getName(), bi.getContent()));
+            }
+        }
+    }
+}