Back port tests.

deploy/vmop-deployment.yaml

@@ -20,7 +20,7 @@ spec:
       containers:
         - name: vm-operator
           image: >-
-            ghcr.io/mnlipp/org.jdrupes.vmoperator.manager:latest
+            ghcr.io/mnlipp/org.jdrupes.vmoperator.manager:3.4.1
           volumeMounts:
             - name: config
               mountPath: /etc/opt/vmoperator

dev-example/config.yaml

@@ -9,6 +9,14 @@
     "/Reconciler":
       runnerData:
         storageClassName: null
+      loadBalancerService:
+        labels:
+          label1: label1
+          label2: toBeReplaced
+        annotations:
+          metallb.universe.tf/loadBalancerIPs: 192.168.168.1
+          metallb.universe.tf/ip-allocated-from-pool: single-common
+          metallb.universe.tf/allow-shared-ip: single-common
   "/GuiSocketServer":
     port: 8888
   "/GuiHttpServer":
@@ -17,12 +25,12 @@
       "/WebConsole":
         "/LoginConlet":
           users:
-            - name: admin
-              fullName: Administrator
-              password: "$2b$05$NiBd74ZGdplLC63ePZf1f.UtjMKkbQ23cQoO2OKOFalDBHWAOy21."
-            - name: test
-              fullName: Test Account
-              password: "$2b$05$hZaI/jToXf/d3BctZdT38Or7H7h6Pn2W3WiB49p5AyhDHFkkYCvo2"
+          - name: admin
+            fullName: Administrator
+            password: "$2b$05$NiBd74ZGdplLC63ePZf1f.UtjMKkbQ23cQoO2OKOFalDBHWAOy21."
+          - name: test
+            fullName: Test Account
+            password: "$2b$05$hZaI/jToXf/d3BctZdT38Or7H7h6Pn2W3WiB49p5AyhDHFkkYCvo2"
         "/RoleConfigurator":
           rolesByUser:
             # User admin has role admin

dev-example/kustomization.yaml

@@ -35,6 +35,14 @@ patches:
             "/Reconciler":
               runnerData:
                 storageClassName: null
+              loadBalancerService:
+                labels:
+                  label1: label1
+                  label2: toBeReplaced
+                annotations:
+                  metallb.universe.tf/loadBalancerIPs: 192.168.168.1
+                  metallb.universe.tf/ip-allocated-from-pool: single-common
+                  metallb.universe.tf/allow-shared-ip: single-common
           "/GuiSocketServer":
             port: 8888
           "/GuiHttpServer":
@@ -43,12 +51,12 @@ patches:
               "/WebConsole":
                 "/LoginConlet":
                   users:
-                    admin:
-                      fullName: Administrator
-                      password: "$2b$05$NiBd74ZGdplLC63ePZf1f.UtjMKkbQ23cQoO2OKOFalDBHWAOy21."
-                    test:
-                      fullName: Test Account
-                      password: "$2b$05$hZaI/jToXf/d3BctZdT38Or7H7h6Pn2W3WiB49p5AyhDHFkkYCvo2"
+                  - name: admin
+                    fullName: Administrator
+                    password: "$2b$05$NiBd74ZGdplLC63ePZf1f.UtjMKkbQ23cQoO2OKOFalDBHWAOy21."
+                  - name: test
+                    fullName: Test Account
+                    password: "$2b$05$hZaI/jToXf/d3BctZdT38Or7H7h6Pn2W3WiB49p5AyhDHFkkYCvo2"
                 "/RoleConfigurator":
                   rolesByUser:
                     # User admin has role admin

org.jdrupes.vmoperator.manager/test-resources/basic-vm.yaml

@@ -0,0 +1,64 @@
+apiVersion: "vmoperator.jdrupes.org/v1"
+kind: VirtualMachine
+metadata:
+  namespace: vmop-dev
+  name: unittest-vm
+spec:
+  image:
+    repository: docker-registry.lan.mnl.de
+    path: vmoperator/this.will.never.start
+    version: 0.0.0
+    
+  cloudInit:
+    metaData: {}
+  
+  vm:
+    # state: Running
+    maximumRam: 4Gi
+    currentRam: 2Gi
+    maximumCpus: 4
+    currentCpus: 2
+    powerdownTimeout: 1
+  
+    networks:
+    - user: {}
+    disks:
+    - cdrom:
+        image: https://test.com/test.iso
+      bootindex: 0
+    - cdrom:
+        image: "image.iso"
+    - volumeClaimTemplate:
+        metadata:
+          name: system
+          annotations:
+            use_as: system-disk
+        spec:
+          storageClassName: local-path
+          resources:
+            requests:
+              storage: 1Gi
+    - volumeClaimTemplate:
+        spec:
+          storageClassName: local-path
+          resources:
+            requests:
+              storage: 1Gi
+
+    display:
+      outputs: 2
+      spice:
+        port: 5812
+        usbRedirects: 2
+
+  resources:
+    requests:
+      cpu: 1
+      memory: 2Gi
+    
+  loadBalancerService:
+    labels:
+      label2: replaced
+      label3: added
+    annotations:
+      anno1: added

org.jdrupes.vmoperator.manager/test-resources/unittest-vm.yaml

@@ -1,35 +0,0 @@
-apiVersion: "vmoperator.jdrupes.org/v1"
-kind: VirtualMachine
-metadata:
-  namespace: vmop-dev
-  name: unittest-vm
-spec:
-  resources:
-    requests:
-      cpu: 1
-      memory: 2Gi
-    
-  loadBalancerService:
-    labels:
-      test2: null
-      test3: added
-
-  vm:
-    # state: Running
-    maximumRam: 4Gi
-    currentRam: 2Gi
-    maximumCpus: 4
-    currentCpus: 2
-    powerdownTimeout: 1
-  
-    networks:
-    - user: {}
-    disks:
-    - cdrom:
-        # image: ""
-        image: https://download.fedoraproject.org/pub/fedora/linux/releases/38/Workstation/x86_64/iso/Fedora-Workstation-Live-x86_64-38-1.6.iso
-        # image: "Fedora-Workstation-Live-x86_64-38-1.6.iso"
-
-    display:
-      spice:
-        port: 5812

org.jdrupes.vmoperator.manager/test/org/jdrupes/vmoperator/manager/BasicTests.java

@@ -1,12 +1,19 @@
 package org.jdrupes.vmoperator.manager;
 
 import io.kubernetes.client.Discovery.APIResource;
+import io.kubernetes.client.custom.Quantity;
+import io.kubernetes.client.custom.V1Patch;
 import io.kubernetes.client.openapi.ApiException;
 import io.kubernetes.client.util.generic.options.ListOptions;
+import io.kubernetes.client.util.generic.options.PatchOptions;
 import java.io.FileReader;
 import java.io.IOException;
+import java.util.Collection;
+import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Map;
 import static org.jdrupes.vmoperator.common.Constants.APP_NAME;
+import static org.jdrupes.vmoperator.common.Constants.COMP_DISPLAY_SECRET;
 import static org.jdrupes.vmoperator.common.Constants.VM_OP_GROUP;
 import static org.jdrupes.vmoperator.common.Constants.VM_OP_KIND_VM;
 import static org.jdrupes.vmoperator.common.Constants.VM_OP_NAME;
@@ -15,7 +22,11 @@ import org.jdrupes.vmoperator.common.K8sClient;
 import org.jdrupes.vmoperator.common.K8sDynamicStub;
 import org.jdrupes.vmoperator.common.K8sV1ConfigMapStub;
 import org.jdrupes.vmoperator.common.K8sV1DeploymentStub;
+import org.jdrupes.vmoperator.common.K8sV1PodStub;
 import org.jdrupes.vmoperator.common.K8sV1PvcStub;
+import org.jdrupes.vmoperator.common.K8sV1SecretStub;
+import org.jdrupes.vmoperator.common.K8sV1ServiceStub;
+import org.jdrupes.vmoperator.util.DataPath;
 import org.junit.jupiter.api.AfterAll;
 import static org.junit.jupiter.api.Assertions.*;
 import org.junit.jupiter.api.BeforeAll;
@@ -29,6 +40,9 @@ class BasicTests {
     private static K8sClient client;
     private static APIResource vmsContext;
     private static K8sV1DeploymentStub mgrDeployment;
+    private static K8sDynamicStub vmStub;
+    private static final String VM_NAME = "unittest-vm";
+    private static final Object EXISTS = new Object();
 
     @BeforeAll
     static void setUpBeforeClass() throws Exception {
@@ -38,23 +52,40 @@ class BasicTests {
         // Get client
         client = new K8sClient();
 
+        // Update manager pod by scaling deployment
+        mgrDeployment
+            = K8sV1DeploymentStub.get(client, "vmop-dev", "vm-operator");
+        mgrDeployment.scale(0);
+        mgrDeployment.scale(1);
+        waitForManager();
+
         // Context for working with our CR
         var apiRes = K8s.context(client, VM_OP_GROUP, null, VM_OP_KIND_VM);
         assertTrue(apiRes.isPresent());
         vmsContext = apiRes.get();
 
         // Cleanup existing VM
-        K8sDynamicStub.get(client, vmsContext, "vmop-dev", "unittest-vm")
+        K8sDynamicStub.get(client, vmsContext, "vmop-dev", VM_NAME)
             .delete();
+        ListOptions listOpts = new ListOptions();
+        listOpts.setLabelSelector("app.kubernetes.io/name=" + APP_NAME + ","
+            + "app.kubernetes.io/instance=" + VM_NAME + ","
+            + "app.kubernetes.io/component=" + COMP_DISPLAY_SECRET);
+        var secrets = K8sV1SecretStub.list(client, "vmop-dev", listOpts);
+        for (var secret : secrets) {
+            secret.delete();
+        }
+        deletePvcs();
 
-        // Update manager pod by scaling deployment
-        mgrDeployment
-            = K8sV1DeploymentStub.get(client, "vmop-dev", "vm-operator");
-        mgrDeployment.scale(0);
-        mgrDeployment.scale(1);
+        // Load from Yaml
+        var rdr = new FileReader("test-resources/basic-vm.yaml");
+        vmStub = K8sDynamicStub.createFromYaml(client, vmsContext, rdr);
+        assertTrue(vmStub.model().isPresent());
+    }
 
+    private static void waitForManager()
+            throws ApiException, InterruptedException {
         // Wait until available
-
         for (int i = 0; i < 10; i++) {
             if (mgrDeployment.model().get().getStatus().getConditions()
                 .stream().filter(c -> "Available".equals(c.getType())).findAny()
@@ -66,70 +97,250 @@ class BasicTests {
         fail("vm-operator not deployed.");
     }
 
-    @AfterAll
-    static void tearDownAfterClass() throws Exception {
-        // Bring down manager
-        mgrDeployment.scale(0);
-    }
-
-    @Test
-    void test() throws IOException, InterruptedException, ApiException {
-        // Load from Yaml
-        var rdr = new FileReader("test-resources/unittest-vm.yaml");
-        var vmStub = K8sDynamicStub.createFromYaml(client, vmsContext, rdr);
-        assertTrue(vmStub.model().isPresent());
-
-        // Wait for created resources
-        assertTrue(waitForConfigMap(client));
-        assertTrue(waitForPvc(client));
-
-        // Check config map
-        var config = K8sV1ConfigMapStub.get(client, "vmop-dev", "unittest-vm")
-            .model().get();
-        var yaml = new Yaml(new SafeConstructor(new LoaderOptions()))
-            .load(config.getData().get("config.yaml"));
-        @SuppressWarnings("unchecked")
-        var maximumRam = ((Map<String, Map<String, Map<String, String>>>) yaml)
-            .get("/Runner").get("vm").get("maximumRam");
-        assertEquals("4 GiB", maximumRam);
-
-        // Cleanup
-        K8sDynamicStub.get(client, vmsContext, "vmop-dev", "unittest-vm")
-            .delete();
+    private static void deletePvcs() throws ApiException {
         ListOptions listOpts = new ListOptions();
         listOpts.setLabelSelector(
             "app.kubernetes.io/managed-by=" + VM_OP_NAME + ","
                 + "app.kubernetes.io/name=" + APP_NAME + ","
-                + "app.kubernetes.io/instance=unittest-vm");
+                + "app.kubernetes.io/instance=" + VM_NAME);
         var knownPvcs = K8sV1PvcStub.list(client, "vmop-dev", listOpts);
         for (var pvc : knownPvcs) {
             pvc.delete();
         }
     }
 
-    private boolean waitForConfigMap(K8sClient client)
-            throws InterruptedException, ApiException {
-        var stub = K8sV1ConfigMapStub.get(client, "vmop-dev", "unittest-vm");
-        for (int i = 0; i < 10; i++) {
-            if (stub.model().isPresent()) {
-                return true;
-            }
-            Thread.sleep(1000);
-        }
-        return false;
+    @AfterAll
+    static void tearDownAfterClass() throws Exception {
+        // Cleanup
+        K8sDynamicStub.get(client, vmsContext, "vmop-dev", VM_NAME)
+            .delete();
+        deletePvcs();
+
+        // Bring down manager
+        mgrDeployment.scale(0);
     }
 
-    private boolean waitForPvc(K8sClient client)
-            throws InterruptedException, ApiException {
-        var stub
-            = K8sV1PvcStub.get(client, "vmop-dev", "unittest-vm-runner-data");
+    @Test
+    void testConfigMap()
+            throws IOException, InterruptedException, ApiException {
+        K8sV1ConfigMapStub stub
+            = K8sV1ConfigMapStub.get(client, "vmop-dev", VM_NAME);
         for (int i = 0; i < 10; i++) {
             if (stub.model().isPresent()) {
-                return true;
+                break;
             }
             Thread.sleep(1000);
         }
-        return false;
+        // Check config map
+        var config = stub.model().get();
+        Map<List<? extends Object>, Object> toCheck = Map.of(
+            List.of("namespace"), "vmop-dev",
+            List.of("name"), VM_NAME,
+            List.of("labels", "app.kubernetes.io/name"), Constants.APP_NAME,
+            List.of("labels", "app.kubernetes.io/instance"), VM_NAME,
+            List.of("labels", "app.kubernetes.io/managed-by"),
+            Constants.VM_OP_NAME,
+            List.of("annotations", "vmoperator.jdrupes.org/version"), EXISTS,
+            List.of("ownerReferences", 0, "apiVersion"),
+            vmsContext.getGroup() + "/" + vmsContext.getVersions().get(0),
+            List.of("ownerReferences", 0, "kind"), Constants.VM_OP_KIND_VM,
+            List.of("ownerReferences", 0, "name"), VM_NAME,
+            List.of("ownerReferences", 0, "uid"), EXISTS);
+        checkProps(config.getMetadata(), toCheck);
+
+        toCheck = new LinkedHashMap<>();
+        toCheck.put(List.of("/Runner", "guestShutdownStops"), false);
+        toCheck.put(List.of("/Runner", "cloudInit", "metaData", "instance-id"),
+            EXISTS);
+        toCheck.put(
+            List.of("/Runner", "cloudInit", "metaData", "local-hostname"),
+            VM_NAME);
+        toCheck.put(List.of("/Runner", "cloudInit", "userData"), Map.of());
+        toCheck.put(List.of("/Runner", "vm", "maximumRam"), "4 GiB");
+        toCheck.put(List.of("/Runner", "vm", "currentRam"), "2 GiB");
+        toCheck.put(List.of("/Runner", "vm", "maximumCpus"), 4);
+        toCheck.put(List.of("/Runner", "vm", "currentCpus"), 2);
+        toCheck.put(List.of("/Runner", "vm", "powerdownTimeout"), 1);
+        toCheck.put(List.of("/Runner", "vm", "network", 0, "type"), "user");
+        toCheck.put(List.of("/Runner", "vm", "drives", 0, "type"), "ide-cd");
+        toCheck.put(List.of("/Runner", "vm", "drives", 0, "file"),
+            "https://test.com/test.iso");
+        toCheck.put(List.of("/Runner", "vm", "drives", 0, "bootindex"), 0);
+        toCheck.put(List.of("/Runner", "vm", "drives", 1, "type"), "ide-cd");
+        toCheck.put(List.of("/Runner", "vm", "drives", 1, "file"),
+            "/var/local/vmop-image-repository/image.iso");
+        toCheck.put(List.of("/Runner", "vm", "drives", 2, "type"), "raw");
+        toCheck.put(List.of("/Runner", "vm", "drives", 2, "resource"),
+            "/dev/system-disk");
+        toCheck.put(List.of("/Runner", "vm", "drives", 3, "type"), "raw");
+        toCheck.put(List.of("/Runner", "vm", "drives", 3, "resource"),
+            "/dev/disk-1");
+        toCheck.put(List.of("/Runner", "vm", "display", "outputs"), 2);
+        toCheck.put(List.of("/Runner", "vm", "display", "spice", "port"), 5812);
+        toCheck.put(
+            List.of("/Runner", "vm", "display", "spice", "usbRedirects"), 2);
+        var cm = new Yaml(new SafeConstructor(new LoaderOptions()))
+            .load(config.getData().get("config.yaml"));
+        checkProps(cm, toCheck);
+    }
+
+    @Test
+    void testDisplaySecret() throws ApiException, InterruptedException {
+        ListOptions listOpts = new ListOptions();
+        listOpts.setLabelSelector("app.kubernetes.io/name=" + APP_NAME + ","
+            + "app.kubernetes.io/instance=" + VM_NAME + ","
+            + "app.kubernetes.io/component=" + COMP_DISPLAY_SECRET);
+        Collection<K8sV1SecretStub> secrets = null;
+        for (int i = 0; i < 10; i++) {
+            secrets = K8sV1SecretStub.list(client, "vmop-dev", listOpts);
+            if (secrets.size() > 0) {
+                break;
+            }
+            Thread.sleep(1000);
+        }
+        assertEquals(1, secrets.size());
+        var secretData = secrets.iterator().next().model().get().getData();
+        checkProps(secretData, Map.of(
+            List.of("display-password"), EXISTS));
+        assertEquals("now", new String(secretData.get("password-expiry")));
+    }
+
+    @Test
+    void testRunnerPvc() throws ApiException, InterruptedException {
+        var stub
+            = K8sV1PvcStub.get(client, "vmop-dev", VM_NAME + "-runner-data");
+        for (int i = 0; i < 10; i++) {
+            if (stub.model().isPresent()) {
+                break;
+            }
+            Thread.sleep(1000);
+        }
+        var pvc = stub.model().get();
+        checkProps(pvc.getMetadata(), Map.of(
+            List.of("labels", "app.kubernetes.io/name"), Constants.APP_NAME,
+            List.of("labels", "app.kubernetes.io/instance"), VM_NAME,
+            List.of("labels", "app.kubernetes.io/managed-by"),
+            Constants.VM_OP_NAME));
+        checkProps(pvc.getSpec(), Map.of(
+            List.of("resources", "requests", "storage"),
+            Quantity.fromString("1Mi")));
+    }
+
+    @Test
+    void testSystemDiskPvc() throws ApiException, InterruptedException {
+        var stub
+            = K8sV1PvcStub.get(client, "vmop-dev", VM_NAME + "-system-disk");
+        for (int i = 0; i < 10; i++) {
+            if (stub.model().isPresent()) {
+                break;
+            }
+            Thread.sleep(1000);
+        }
+        var pvc = stub.model().get();
+        checkProps(pvc.getMetadata(), Map.of(
+            List.of("labels", "app.kubernetes.io/name"), Constants.APP_NAME,
+            List.of("labels", "app.kubernetes.io/instance"), VM_NAME,
+            List.of("labels", "app.kubernetes.io/managed-by"),
+            Constants.VM_OP_NAME,
+            List.of("annotations", "use_as"), "system-disk"));
+        checkProps(pvc.getSpec(), Map.of(
+            List.of("resources", "requests", "storage"),
+            Quantity.fromString("1Gi")));
+    }
+
+    @Test
+    void testDisk1Pvc() throws ApiException, InterruptedException {
+        var stub
+            = K8sV1PvcStub.get(client, "vmop-dev", VM_NAME + "-disk-1");
+        for (int i = 0; i < 10; i++) {
+            if (stub.model().isPresent()) {
+                break;
+            }
+            Thread.sleep(1000);
+        }
+        var pvc = stub.model().get();
+        checkProps(pvc.getMetadata(), Map.of(
+            List.of("labels", "app.kubernetes.io/name"), Constants.APP_NAME,
+            List.of("labels", "app.kubernetes.io/instance"), VM_NAME,
+            List.of("labels", "app.kubernetes.io/managed-by"),
+            Constants.VM_OP_NAME));
+        checkProps(pvc.getSpec(), Map.of(
+            List.of("resources", "requests", "storage"),
+            Quantity.fromString("1Gi")));
+    }
+
+    @Test
+    void testPod() throws ApiException, InterruptedException {
+        PatchOptions opts = new PatchOptions();
+        opts.setForce(true);
+        opts.setFieldManager("kubernetes-java-kubectl-apply");
+        assertTrue(vmStub.patch(V1Patch.PATCH_FORMAT_JSON_PATCH,
+            new V1Patch("[{\"op\": \"replace\", \"path\": \"/spec/vm/state"
+                + "\", \"value\": \"Running\"}]"),
+            client.defaultPatchOptions()).isPresent());
+        var stub = K8sV1PodStub.get(client, "vmop-dev", VM_NAME);
+        for (int i = 0; i < 20; i++) {
+            if (stub.model().isPresent()) {
+                break;
+            }
+            Thread.sleep(1000);
+        }
+        var pod = stub.model().get();
+        checkProps(pod.getMetadata(), Map.of(
+            List.of("labels", "app.kubernetes.io/name"), APP_NAME,
+            List.of("labels", "app.kubernetes.io/instance"), VM_NAME,
+            List.of("labels", "app.kubernetes.io/component"), APP_NAME,
+            List.of("labels", "app.kubernetes.io/managed-by"),
+            Constants.VM_OP_NAME,
+            List.of("annotations", "vmrunner.jdrupes.org/cmVersion"), EXISTS,
+            List.of("annotations", "vmoperator.jdrupes.org/version"), EXISTS,
+            List.of("ownerReferences", 0, "apiVersion"),
+            vmsContext.getGroup() + "/" + vmsContext.getVersions().get(0),
+            List.of("ownerReferences", 0, "kind"), Constants.VM_OP_KIND_VM,
+            List.of("ownerReferences", 0, "name"), VM_NAME,
+            List.of("ownerReferences", 0, "uid"), EXISTS));
+        checkProps(pod.getSpec(), Map.of(
+            List.of("containers", 0, "image"), EXISTS,
+            List.of("containers", 0, "name"), VM_NAME,
+            List.of("containers", 0, "resources", "requests", "cpu"),
+            Quantity.fromString("1")));
+    }
+
+    @Test
+    public void testLoadBalancer() throws ApiException, InterruptedException {
+        var stub = K8sV1ServiceStub.get(client, "vmop-dev", VM_NAME);
+        for (int i = 0; i < 10; i++) {
+            if (stub.model().isPresent()) {
+                break;
+            }
+            Thread.sleep(1000);
+        }
+        var svc = stub.model().get();
+        checkProps(svc.getMetadata(), Map.of(
+            List.of("labels", "app.kubernetes.io/name"), APP_NAME,
+            List.of("labels", "app.kubernetes.io/instance"), VM_NAME,
+            List.of("labels", "app.kubernetes.io/managed-by"), VM_OP_NAME,
+            List.of("labels", "label1"), "label1",
+            List.of("labels", "label2"), "replaced",
+            List.of("labels", "label3"), "added",
+            List.of("annotations", "metallb.universe.tf/loadBalancerIPs"),
+            "192.168.168.1",
+            List.of("annotations", "anno1"), "added"));
+    }
+
+    private void checkProps(Object obj,
+            Map<? extends List<? extends Object>, Object> toCheck) {
+        for (var entry : toCheck.entrySet()) {
+            var prop = DataPath.get(obj, entry.getKey().toArray());
+            assertTrue(prop.isPresent(), () -> "Property " + entry.getKey()
+                + " not found in " + obj);
+
+            // Check for existance only
+            if (entry.getValue() == EXISTS) {
+                continue;
+            }
+            assertEquals(entry.getValue(), prop.get());
+        }
     }
 
 }

org.jdrupes.vmoperator.util/src/org/jdrupes/vmoperator/util/DataPath.java

@@ -0,0 +1,176 @@
+/*
+ * VM-Operator
+ * Copyright (C) 2023 Michael N. Lipp
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.jdrupes.vmoperator.util;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.logging.Logger;
+
+/**
+ * Utility class that supports navigation through arbitrary data structures.
+ */
+public final class DataPath {
+
+    private static final Logger logger
+        = Logger.getLogger(DataPath.class.getName());
+
+    private DataPath() {
+    }
+
+    /**
+     * Apply the given selectors on the given object and return the
+     * value reached.
+     * 
+     * Selectors can be if type {@link String} or {@link Number}. The
+     * former are used to access a property of an object, the latter to
+     * access an element in an array or a {@link List}.
+     * 
+     * Depending on the object currently visited, a {@link String} can
+     * be the key of a {@link Map}, the property part of a getter method
+     * or the name of a method that has an empty parameter list.
+     *
+     * @param <T> the generic type
+     * @param from the from
+     * @param selectors the selectors
+     * @return the result
+     */
+    @SuppressWarnings("PMD.UseLocaleWithCaseConversions")
+    public static <T> Optional<T> get(Object from, Object... selectors) {
+        Object cur = from;
+        for (var selector : selectors) {
+            if (cur == null) {
+                return Optional.empty();
+            }
+            if (selector instanceof String && cur instanceof Map map) {
+                cur = map.get(selector);
+                continue;
+            }
+            if (selector instanceof Number index && cur instanceof List list) {
+                cur = list.get(index.intValue());
+                continue;
+            }
+            if (selector instanceof String property) {
+                var retrieved = tryAccess(cur, property);
+                if (retrieved.isEmpty()) {
+                    return Optional.empty();
+                }
+                cur = retrieved.get();
+            }
+        }
+        @SuppressWarnings("unchecked")
+        var result = Optional.ofNullable((T) cur);
+        return result;
+    }
+
+    @SuppressWarnings("PMD.UseLocaleWithCaseConversions")
+    private static Optional<Object> tryAccess(Object obj, String property) {
+        Method acc = null;
+        try {
+            // Try getter
+            acc = obj.getClass().getMethod("get" + property.substring(0, 1)
+                .toUpperCase() + property.substring(1));
+        } catch (SecurityException e) {
+            return Optional.empty();
+        } catch (NoSuchMethodException e) { // NOPMD
+            // Can happen...
+        }
+        if (acc == null) {
+            try {
+                // Try method
+                acc = obj.getClass().getMethod(property);
+            } catch (SecurityException | NoSuchMethodException e) {
+                return Optional.empty();
+            }
+        }
+        if (acc != null) {
+            try {
+                return Optional.ofNullable(acc.invoke(obj));
+            } catch (IllegalAccessException
+                    | InvocationTargetException e) {
+                return Optional.empty();
+            }
+        }
+        return Optional.empty();
+    }
+
+    /**
+     * Attempts to make a as-deep-as-possible copy of the given
+     * container. New containers will be created for Maps, Lists and
+     * Arrays. The method is invoked recursively for the entries/items.
+     * 
+     * If invoked with an object that is neither a map, list or array,
+     * the methods checks if the object implements {@link Cloneable}
+     * and if it does, invokes its {@link Object#clone()} method.
+     * Else the method return the object.
+     *
+     * @param <T> the generic type
+     * @param object the container
+     * @return the t
+     */
+    @SuppressWarnings({ "PMD.CognitiveComplexity", "unchecked" })
+    public static <T> T deepCopy(T object) {
+        if (object instanceof Map map) {
+            @SuppressWarnings("PMD.UseConcurrentHashMap")
+            Map<Object, Object> copy;
+            try {
+                copy = (Map<Object, Object>) object.getClass().getConstructor()
+                    .newInstance();
+            } catch (InstantiationException | IllegalAccessException
+                    | IllegalArgumentException | InvocationTargetException
+                    | NoSuchMethodException | SecurityException e) {
+                logger.severe(
+                    () -> "Cannot create new instance of " + object.getClass());
+                return null;
+            }
+            for (var entry : ((Map<?, ?>) map).entrySet()) {
+                copy.put(entry.getKey(),
+                    deepCopy(entry.getValue()));
+            }
+            return (T) copy;
+        }
+        if (object instanceof List list) {
+            List<Object> copy = new ArrayList<>();
+            for (var item : list) {
+                copy.add(deepCopy(item));
+            }
+            return (T) copy;
+        }
+        if (object.getClass().isArray()) {
+            var copy = new ArrayList<>();
+            for (var item : (Object[]) object) {
+                copy.add(deepCopy(item));
+            }
+            return (T) copy.toArray();
+        }
+        if (object instanceof Cloneable) {
+            try {
+                return (T) object.getClass().getMethod("clone")
+                    .invoke(object);
+            } catch (IllegalAccessException | InvocationTargetException
+                    | NoSuchMethodException | SecurityException e) {
+                return object;
+            }
+        }
+        return object;
+    }
+}