Add workflow labels and annotations global vars

docs/variables.md

@@ -43,6 +43,8 @@ The following variables are made available to reference various metadata of a wo
 | `workflow.uid` | Workflow UID. Useful for setting ownership reference to a resource, or a unique artifact location |
 | `workflow.parameters.<NAME>` | Input parameter to the workflow |
 | `workflow.outputs.parameters.<NAME>` | Input artifact to the workflow |
+| `workflow.annotations.<NAME>` | Workflow annotations |
+| `workflow.labels.<NAME>` | Workflow labels |
 | `workflow.creationTimestamp` | Workflow creation timestamp formatted in RFC 3339  (e.g. `2018-08-23T05:42:49Z`) |
 | `workflow.creationTimestamp.<STRFTIMECHAR>` | Creation timestamp formatted with a [strftime](http://strftime.org) format character |
 

workflow/controller/operator.go

@@ -254,6 +254,12 @@ func (woc *wfOperationCtx) setGlobalParameters() {
 	for _, param := range woc.wf.Spec.Arguments.Parameters {
 		woc.globalParams["workflow.parameters."+param.Name] = *param.Value
 	}
+	for k, v := range woc.wf.ObjectMeta.Annotations {
+		woc.globalParams["workflow.annotations."+k] = v
+	}
+	for k, v := range woc.wf.ObjectMeta.Labels {
+		woc.globalParams["workflow.labels."+k] = v
+	}
 	if woc.wf.Status.Outputs != nil {
 		for _, param := range woc.wf.Status.Outputs.Parameters {
 			woc.globalParams["workflow.outputs.parameters."+param.Name] = *param.Value

workflow/controller/operator_test.go

@@ -886,3 +886,64 @@ func TestExpandWithSequence(t *testing.T) {
 	assert.Equal(t, "testuser01", items[0].Value.(string))
 	assert.Equal(t, "testuser0A", items[9].Value.(string))
 }
+
+var metadataTemplate = `
+apiVersion: argoproj.io/v1alpha1
+kind: Workflow
+metadata:
+  name: metadata-template
+  labels:
+    image: foo:bar
+  annotations:
+    k8s-webhook-handler.io/repo: "git@github.com:argoproj/argo.git"
+    k8s-webhook-handler.io/revision: 1e111caa1d2cc672b3b53c202b96a5f660a7e9b2
+spec:
+  entrypoint: foo
+  templates:
+    - name: foo
+      container:
+        image: "{{workflow.labels.image}}"
+        env:
+          - name: REPO
+            value: "{{workflow.annotations.k8s-webhook-handler.io/repo}}"
+          - name: REVISION
+            value: "{{workflow.annotations.k8s-webhook-handler.io/revision}}"
+        command: [sh, -c]
+        args: ["echo hello world"]
+`
+
+func TestMetadataPassing(t *testing.T) {
+	controller := newController()
+	wfcset := controller.wfclientset.ArgoprojV1alpha1().Workflows("")
+	wf := unmarshalWF(metadataTemplate)
+	wf, err := wfcset.Create(wf)
+	assert.Nil(t, err)
+	wf, err = wfcset.Get(wf.ObjectMeta.Name, metav1.GetOptions{})
+	assert.Nil(t, err)
+	woc := newWorkflowOperationCtx(wf, controller)
+	woc.operate()
+	assert.Equal(t, wfv1.NodeRunning, woc.wf.Status.Phase)
+	pods, err := controller.kubeclientset.CoreV1().Pods(wf.ObjectMeta.Namespace).List(metav1.ListOptions{})
+	assert.Nil(t, err)
+	assert.True(t, len(pods.Items) > 0, "pod was not created successfully")
+
+	var (
+		pod       = pods.Items[0]
+		container = pod.Spec.Containers[0]
+		foundRepo = false
+		foundRev  = false
+	)
+	for _, ev := range container.Env {
+		switch ev.Name {
+		case "REPO":
+			assert.Equal(t, "git@github.com:argoproj/argo.git", ev.Value)
+			foundRepo = true
+		case "REVISION":
+			assert.Equal(t, "1e111caa1d2cc672b3b53c202b96a5f660a7e9b2", ev.Value)
+			foundRev = true
+		}
+	}
+	assert.True(t, foundRepo)
+	assert.True(t, foundRev)
+	assert.Equal(t, "foo:bar", container.Image)
+}

workflow/validate/validate.go

@@ -66,6 +66,14 @@ func ValidateWorkflow(wf *wfv1.Workflow, lint ...bool) error {
 	for _, param := range ctx.wf.Spec.Arguments.Parameters {
 		ctx.globalParams["workflow.parameters."+param.Name] = placeholderValue
 	}
+
+	for k := range ctx.wf.ObjectMeta.Annotations {
+		ctx.globalParams["workflow.annotations."+k] = placeholderValue
+	}
+	for k := range ctx.wf.ObjectMeta.Labels {
+		ctx.globalParams["workflow.labels."+k] = placeholderValue
+	}
+
 	if ctx.wf.Spec.Entrypoint == "" {
 		return errors.New(errors.CodeBadRequest, "spec.entrypoint is required")
 	}
@@ -111,6 +119,7 @@ func (ctx *wfValidationCtx) validateTemplate(tmpl *wfv1.Template, args wfv1.Argu
 		localParams[common.LocalVarPodName] = placeholderValue
 		scope[common.LocalVarPodName] = placeholderValue
 	}
+
 	_, err = common.ProcessArgs(tmpl, args, ctx.globalParams, localParams, true)
 	if err != nil {
 		return errors.Errorf(errors.CodeBadRequest, "templates.%s %s", tmpl.Name, err)