Merge pull request #334 from surajssd/create_pod

support for raw pod output without controller

docs/user-guide.md

@@ -306,3 +306,27 @@ services:
     labels: 
       kompose.service.type: nodeport
 ```
+
+## Restart
+
+If you want to create normal pods without controllers you can use `restart` construct of docker-compose to define that. Follow table below to see what heppens on the `restart` value.
+
+| `docker-compose` `restart` | object created    | Pod `restartPolicy` |
+|----------------------------|-------------------|---------------------|
+| `""`                       | controller object | `Always`            |
+| `always`                   | controller object | `Always`            |
+| `on-failure`               | Pod               | `OnFailure`         |
+| `no`                       | Pod               | `Never`             |
+
+**Note**: controller object could be `deployment` or `replicationcontroller`, etc.
+
+For e.g. `mariadb` service will become pod down here.
+
+```yaml
+version: "2"
+
+services:
+  mariadb:
+    image: centos/mariadb
+    restart: "no"
+```

pkg/transformer/kubernetes/k8sutils.go

@@ -185,6 +185,8 @@ func PrintList(objects []runtime.Object, opt kobject.ConvertOptions) error {
 				file = transformer.Print(t.Name, strings.ToLower(t.Kind), data, opt.ToStdout, opt.GenerateYaml, f)
 			case *api.PersistentVolumeClaim:
 				file = transformer.Print(t.Name, strings.ToLower(t.Kind), data, opt.ToStdout, opt.GenerateYaml, f)
+			case *api.Pod:
+				file = transformer.Print(t.Name, strings.ToLower(t.Kind), data, opt.ToStdout, opt.GenerateYaml, f)
 			}
 			files = append(files, file)
 		}

pkg/transformer/kubernetes/kubernetes.go

@@ -326,6 +326,27 @@ func (k *Kubernetes) CreateKubernetesObjects(name string, service kobject.Servic
 	return objects
 }
 
+func (k *Kubernetes) InitPod(name string, service kobject.ServiceConfig) *api.Pod {
+	pod := api.Pod{
+		TypeMeta: unversioned.TypeMeta{
+			Kind:       "Pod",
+			APIVersion: "v1",
+		},
+		ObjectMeta: api.ObjectMeta{
+			Name: name,
+		},
+		Spec: api.PodSpec{
+			Containers: []api.Container{
+				{
+					Name:  name,
+					Image: service.Image,
+				},
+			},
+		},
+	}
+	return &pod
+}
+
 // Transform maps komposeObject to k8s objects
 // returns object that are already sorted in the way that Services are first
 func (k *Kubernetes) Transform(komposeObject kobject.KomposeObject, opt kobject.ConvertOptions) []runtime.Object {
@@ -333,13 +354,20 @@ func (k *Kubernetes) Transform(komposeObject kobject.KomposeObject, opt kobject.
 	var allobjects []runtime.Object
 
 	for name, service := range komposeObject.ServiceConfigs {
-		objects := k.CreateKubernetesObjects(name, service, opt)
+		var objects []runtime.Object
 
+		// Generate pod only and nothing more
+		if service.Restart == "no" || service.Restart == "on-failure" {
+			pod := k.InitPod(name, service)
+			objects = append(objects, pod)
+		} else {
+			objects = k.CreateKubernetesObjects(name, service, opt)
 			// If ports not provided in configuration we will not make service
 			if k.PortsExist(name, service) {
 				svc := k.CreateService(name, service, objects)
 				objects = append(objects, svc)
 			}
+		}
 
 		k.UpdateKubernetesObjects(name, service, &objects)
 
@@ -370,6 +398,14 @@ func (k *Kubernetes) UpdateController(obj runtime.Object, updateTemplate func(*a
 	case *deployapi.DeploymentConfig:
 		updateTemplate(t.Spec.Template)
 		updateMeta(&t.ObjectMeta)
+	case *api.Pod:
+		p := api.PodTemplateSpec{
+			ObjectMeta: t.ObjectMeta,
+			Spec:       t.Spec,
+		}
+		updateTemplate(&p)
+		t.Spec = p.Spec
+		t.ObjectMeta = p.ObjectMeta
 	}
 }
 

pkg/transformer/kubernetes/kubernetes_test.go

@@ -319,3 +319,37 @@ func TestKomposeConvert(t *testing.T) {
 		}
 	}
 }
+
+func TestConvertRestartOptions(t *testing.T) {
+	var opt kobject.ConvertOptions
+	var k Kubernetes
+
+	testCases := map[string]struct {
+		svc           kobject.KomposeObject
+		restartPolicy api.RestartPolicy
+	}{
+		"'restart' is set to 'no'":         {kobject.KomposeObject{ServiceConfigs: map[string]kobject.ServiceConfig{"app": kobject.ServiceConfig{Image: "foobar", Restart: "no"}}}, api.RestartPolicyNever},
+		"'restart' is set to 'on-failure'": {kobject.KomposeObject{ServiceConfigs: map[string]kobject.ServiceConfig{"app": kobject.ServiceConfig{Image: "foobar", Restart: "on-failure"}}}, api.RestartPolicyOnFailure},
+	}
+
+	for name, test := range testCases {
+		t.Log("Test Case:", name)
+
+		objs := k.Transform(test.svc, opt)
+
+		if len(objs) != 1 {
+			t.Errorf("Expected only one pod, more elements generated.")
+		}
+
+		for _, obj := range objs {
+			if pod, ok := obj.(*api.Pod); ok {
+
+				if pod.Spec.RestartPolicy != test.restartPolicy {
+					t.Errorf("Expected restartPolicy as %s, got %#v", test.restartPolicy, pod.Spec.RestartPolicy)
+				}
+			} else {
+				t.Errorf("Expected 'pod' object not found one")
+			}
+		}
+	}
+}

pkg/transformer/openshift/openshift.go

@@ -155,7 +155,14 @@ func (o *OpenShift) Transform(komposeObject kobject.KomposeObject, opt kobject.C
 	var allobjects []runtime.Object
 
 	for name, service := range komposeObject.ServiceConfigs {
-		objects := o.CreateKubernetesObjects(name, service, opt)
+		var objects []runtime.Object
+
+		// Generate pod only and nothing more
+		if service.Restart == "no" || service.Restart == "on-failure" {
+			pod := o.InitPod(name, service)
+			objects = append(objects, pod)
+		} else {
+			objects = o.CreateKubernetesObjects(name, service, opt)
 
 			if opt.CreateDeploymentConfig {
 				objects = append(objects, o.initDeploymentConfig(name, service, opt.Replicas)) // OpenShift DeploymentConfigs
@@ -168,7 +175,7 @@ func (o *OpenShift) Transform(komposeObject kobject.KomposeObject, opt kobject.C
 				svc := o.CreateService(name, service, objects)
 				objects = append(objects, svc)
 			}
-
+		}
 		o.UpdateKubernetesObjects(name, service, &objects)
 
 		allobjects = append(allobjects, objects...)

script/test/cmd/tests.sh

@@ -103,4 +103,14 @@ convert::expect_success "kompose --bundle $KOMPOSE_ROOT/script/test/fixtures/bun
 # Test related to kompose --bundle convert to ensure that DSB bundles are converted properly
 convert::expect_success_and_warning "kompose --bundle $KOMPOSE_ROOT/script/test/fixtures/bundles/dsb/docker-voting-bundle.dsb convert --stdout" "$KOMPOSE_ROOT/script/test/fixtures/bundles/dsb/output-k8s.json" "Service cannot be created because of missing port."
 
+
+######
+# Test related to restart options in docker-compose
+# kubernetes test
+convert::expect_success "kompose -f $KOMPOSE_ROOT/script/test/fixtures/restart-options/docker-compose-restart-no.yml convert --stdout" "$KOMPOSE_ROOT/script/test/fixtures/restart-options/output-k8s-restart-no.json"
+convert::expect_success "kompose -f $KOMPOSE_ROOT/script/test/fixtures/restart-options/docker-compose-restart-onfail.yml convert --stdout" "$KOMPOSE_ROOT/script/test/fixtures/restart-options/output-k8s-restart-onfail.json"
+# openshift test
+convert::expect_success "kompose -f $KOMPOSE_ROOT/script/test/fixtures/restart-options/docker-compose-restart-no.yml --provider openshift convert --stdout" "$KOMPOSE_ROOT/script/test/fixtures/restart-options/output-os-restart-no.json"
+convert::expect_success "kompose -f $KOMPOSE_ROOT/script/test/fixtures/restart-options/docker-compose-restart-onfail.yml --provider openshift convert --stdout" "$KOMPOSE_ROOT/script/test/fixtures/restart-options/output-os-restart-onfail.json"
+
 exit $EXIT_STATUS

script/test/fixtures/restart-options/docker-compose-restart-no.yml

@@ -0,0 +1,9 @@
+version: "2"
+
+services:
+  foo:
+    image: "foobar"
+    restart: "no"
+    environment:
+      GITHUB: surajssd
+

script/test/fixtures/restart-options/docker-compose-restart-onfail.yml

@@ -0,0 +1,9 @@
+version: "2"
+
+services:
+  foo:
+    image: "foobar"
+    restart: "on-failure"
+    environment:
+      GITHUB: surajssd
+

script/test/fixtures/restart-options/output-k8s-restart-no.json

@@ -0,0 +1,35 @@
+{
+  "kind": "List",
+  "apiVersion": "v1",
+  "metadata": {},
+  "items": [
+    {
+      "kind": "Pod",
+      "apiVersion": "v1",
+      "metadata": {
+        "name": "foo",
+        "creationTimestamp": null,
+        "labels": {
+          "service": "foo"
+        }
+      },
+      "spec": {
+        "containers": [
+          {
+            "name": "foo",
+            "image": "foobar",
+            "env": [
+              {
+                "name": "GITHUB",
+                "value": "surajssd"
+              }
+            ],
+            "resources": {}
+          }
+        ],
+        "restartPolicy": "Never"
+      },
+      "status": {}
+    }
+  ]
+}

script/test/fixtures/restart-options/output-k8s-restart-onfail.json

@@ -0,0 +1,35 @@
+{
+  "kind": "List",
+  "apiVersion": "v1",
+  "metadata": {},
+  "items": [
+    {
+      "kind": "Pod",
+      "apiVersion": "v1",
+      "metadata": {
+        "name": "foo",
+        "creationTimestamp": null,
+        "labels": {
+          "service": "foo"
+        }
+      },
+      "spec": {
+        "containers": [
+          {
+            "name": "foo",
+            "image": "foobar",
+            "env": [
+              {
+                "name": "GITHUB",
+                "value": "surajssd"
+              }
+            ],
+            "resources": {}
+          }
+        ],
+        "restartPolicy": "OnFailure"
+      },
+      "status": {}
+    }
+  ]
+}

script/test/fixtures/restart-options/output-os-restart-no.json

@@ -0,0 +1,35 @@
+{
+  "kind": "List",
+  "apiVersion": "v1",
+  "metadata": {},
+  "items": [
+    {
+      "kind": "Pod",
+      "apiVersion": "v1",
+      "metadata": {
+        "name": "foo",
+        "creationTimestamp": null,
+        "labels": {
+          "service": "foo"
+        }
+      },
+      "spec": {
+        "containers": [
+          {
+            "name": "foo",
+            "image": "foobar",
+            "env": [
+              {
+                "name": "GITHUB",
+                "value": "surajssd"
+              }
+            ],
+            "resources": {}
+          }
+        ],
+        "restartPolicy": "Never"
+      },
+      "status": {}
+    }
+  ]
+}

script/test/fixtures/restart-options/output-os-restart-onfail.json

@@ -0,0 +1,35 @@
+{
+  "kind": "List",
+  "apiVersion": "v1",
+  "metadata": {},
+  "items": [
+    {
+      "kind": "Pod",
+      "apiVersion": "v1",
+      "metadata": {
+        "name": "foo",
+        "creationTimestamp": null,
+        "labels": {
+          "service": "foo"
+        }
+      },
+      "spec": {
+        "containers": [
+          {
+            "name": "foo",
+            "image": "foobar",
+            "env": [
+              {
+                "name": "GITHUB",
+                "value": "surajssd"
+              }
+            ],
+            "resources": {}
+          }
+        ],
+        "restartPolicy": "OnFailure"
+      },
+      "status": {}
+    }
+  ]
+}