Add allNamespaces() method to KubectlGet to match kubectl --all-namespaces/-A flag

Co-authored-by: brendandburns <5751682+brendandburns@users.noreply.github.com>

Author: Copilot

extended/src/main/java/io/kubernetes/client/extended/kubectl/KubectlGet.java

@@ -29,10 +29,12 @@ public class KubectlGet<ApiType extends KubernetesObject>
   private ListOptions listOptions;
   private Class<ApiType> apiTypeClass;
   private Class<? extends KubernetesListObject> apiTypeListClass;
+  private boolean allNamespaces;
 
   KubectlGet(Class<ApiType> apiTypeClass) {
     this.apiTypeClass = apiTypeClass;
     this.listOptions = new ListOptions();
+    this.allNamespaces = false;
   }
 
   public KubectlGet<ApiType> apiListTypeClass(
@@ -51,6 +53,11 @@ public KubectlGet<ApiType> namespace(String namespace) {
     return this;
   }
 
+  public KubectlGet<ApiType> allNamespaces() {
+    this.allNamespaces = true;
+    return this;
+  }
+
   public KubectlGetSingle name(String name) {
     return new KubectlGetSingle(name);
   }
@@ -64,7 +71,9 @@ public List<ApiType> execute() throws KubectlException {
             ? getGenericApi(apiTypeClass)
             : getGenericApi(apiTypeClass, apiTypeListClass);
     try {
-      if (isNamespaced()) {
+      if (allNamespaces) {
+        return (List<ApiType>) api.list(listOptions).throwsApiException().getObject().getItems();
+      } else if (isNamespaced()) {
         return (List<ApiType>)
             api.list(namespace, listOptions).throwsApiException().getObject().getItems();
 

extended/src/test/java/io/kubernetes/client/extended/kubectl/KubectlGetTest.java

@@ -96,6 +96,56 @@ void getDefaultNamespacePods() throws KubectlException {
     assertThat(pods).hasSize(2);
   }
 
+  @Test
+  void getAllNamespacePodsWithAllNamespacesFlag() throws KubectlException {
+    V1PodList podList =
+        new V1PodList()
+            .items(
+                Arrays.asList(
+                    new V1Pod().metadata(new V1ObjectMeta().namespace("default").name("foo1")),
+                    new V1Pod().metadata(new V1ObjectMeta().namespace("kube-system").name("foo2"))));
+    apiServer.stubFor(
+        get(urlPathEqualTo("/api/v1/pods"))
+            .willReturn(
+                aResponse().withStatus(200).withBody(apiClient.getJSON().serialize(podList))));
+
+    List<V1Pod> pods =
+        Kubectl.get(V1Pod.class)
+            .apiClient(apiClient)
+            .skipDiscovery()
+            .allNamespaces()
+            .execute();
+
+    apiServer.verify(1, getRequestedFor(urlPathEqualTo("/api/v1/pods")));
+    assertThat(pods).hasSize(2);
+  }
+
+  @Test
+  void getAllNamespacesFlagOverridesNamespace() throws KubectlException {
+    V1PodList podList =
+        new V1PodList()
+            .items(
+                Arrays.asList(
+                    new V1Pod().metadata(new V1ObjectMeta().namespace("default").name("foo1")),
+                    new V1Pod().metadata(new V1ObjectMeta().namespace("kube-system").name("foo2"))));
+    apiServer.stubFor(
+        get(urlPathEqualTo("/api/v1/pods"))
+            .willReturn(
+                aResponse().withStatus(200).withBody(apiClient.getJSON().serialize(podList))));
+
+    // When allNamespaces() is called, it should ignore the namespace setting
+    List<V1Pod> pods =
+        Kubectl.get(V1Pod.class)
+            .apiClient(apiClient)
+            .skipDiscovery()
+            .namespace("default")
+            .allNamespaces()
+            .execute();
+
+    apiServer.verify(1, getRequestedFor(urlPathEqualTo("/api/v1/pods")));
+    assertThat(pods).hasSize(2);
+  }
+
   @Test
   void getDefaultNamespaceOnePod() throws KubectlException {
     V1Pod pod = new V1Pod().metadata(new V1ObjectMeta().namespace("default").name("foo1"));