Add support for conversion webhook 🍸

This adds a new webhook controller : ConversionController.
The `HubVersion` is the stored version, and Zygotes stores the types
of supported versions.

The CRDs are updated to setup the conversion strategy to webhook,
pointing to the tekton-pipelines-webhook.

An update in the webhook clusterrole is required for customresourcedefinitions.

Signed-off-by: Vincent Demeester <vdemeest@redhat.com>

cmd/webhook/main.go

@@ -21,6 +21,7 @@ import (
 	"os"
 
 	defaultconfig "github.com/tektoncd/pipeline/pkg/apis/config"
+	"github.com/tektoncd/pipeline/pkg/apis/pipeline"
 	"github.com/tektoncd/pipeline/pkg/apis/pipeline/v1alpha1"
 	"github.com/tektoncd/pipeline/pkg/apis/pipeline/v1beta1"
 	"github.com/tektoncd/pipeline/pkg/contexts"
@@ -37,6 +38,7 @@ import (
 	"knative.dev/pkg/webhook/certificates"
 	"knative.dev/pkg/webhook/configmaps"
 	"knative.dev/pkg/webhook/resourcesemantics"
+	"knative.dev/pkg/webhook/resourcesemantics/conversion"
 	"knative.dev/pkg/webhook/resourcesemantics/defaulting"
 	"knative.dev/pkg/webhook/resourcesemantics/validation"
 )
@@ -85,6 +87,9 @@ func NewDefaultingAdmissionController(ctx context.Context, cmw configmap.Watcher
 }
 
 func NewValidationAdmissionController(ctx context.Context, cmw configmap.Watcher) *controller.Impl {
+	// Decorate contexts with the current state of the config.
+	store := defaultconfig.NewStore(logging.FromContext(ctx).Named("config-store"))
+	store.WatchConfigs(cmw)
 	return validation.NewAdmissionController(ctx,
 
 		// Name of the resource webhook.
@@ -98,7 +103,7 @@ func NewValidationAdmissionController(ctx context.Context, cmw configmap.Watcher
 
 		// A function that infuses the context passed to Validate/SetDefaults with custom metadata.
 		func(ctx context.Context) context.Context {
-			return ctx
+			return contexts.WithUpgradeViaDefaulting(store.ToContext(ctx))
 		},
 
 		// Whether to disallow unknown fields.
@@ -124,6 +129,68 @@ func NewConfigValidationController(ctx context.Context, cmw configmap.Watcher) *
 	)
 }
 
+func NewConversionController(ctx context.Context, cmw configmap.Watcher) *controller.Impl {
+	// nolint: golint
+	var (
+		v1alpha1_ = v1alpha1.SchemeGroupVersion.Version
+		v1beta1_  = v1beta1.SchemeGroupVersion.Version
+	)
+
+	return conversion.NewConversionController(ctx,
+		// The path on which to serve the webhook
+		"/resource-conversion",
+
+		// Specify the types of custom resource definitions that should be converted
+		map[schema.GroupKind]conversion.GroupKindConversion{
+			v1beta1.Kind("Task"): {
+				DefinitionName: pipeline.TaskResource.String(),
+				HubVersion:     v1alpha1_,
+				Zygotes: map[string]conversion.ConvertibleObject{
+					v1alpha1_: &v1alpha1.Task{},
+					v1beta1_:  &v1beta1.Task{},
+				},
+			},
+			v1beta1.Kind("ClusterTask"): {
+				DefinitionName: pipeline.ClusterTaskResource.String(),
+				HubVersion:     v1alpha1_,
+				Zygotes: map[string]conversion.ConvertibleObject{
+					v1alpha1_: &v1alpha1.ClusterTask{},
+					v1beta1_:  &v1beta1.ClusterTask{},
+				},
+			},
+			v1beta1.Kind("TaskRun"): {
+				DefinitionName: pipeline.TaskRunResource.String(),
+				HubVersion:     v1alpha1_,
+				Zygotes: map[string]conversion.ConvertibleObject{
+					v1alpha1_: &v1alpha1.TaskRun{},
+					v1beta1_:  &v1beta1.TaskRun{},
+				},
+			},
+			v1beta1.Kind("Pipeline"): {
+				DefinitionName: pipeline.PipelineResource.String(),
+				HubVersion:     v1alpha1_,
+				Zygotes: map[string]conversion.ConvertibleObject{
+					v1alpha1_: &v1alpha1.Pipeline{},
+					v1beta1_:  &v1beta1.Pipeline{},
+				},
+			},
+			v1beta1.Kind("PipelineRun"): {
+				DefinitionName: pipeline.PipelineRunResource.String(),
+				HubVersion:     v1alpha1_,
+				Zygotes: map[string]conversion.ConvertibleObject{
+					v1alpha1_: &v1alpha1.PipelineRun{},
+					v1beta1_:  &v1beta1.PipelineRun{},
+				},
+			},
+		},
+
+		// A function that infuses the context passed to ConvertTo/ConvertFrom/SetDefaults with custom metadata
+		func(ctx context.Context) context.Context {
+			return ctx
+		},
+	)
+}
+
 func main() {
 	serviceName := os.Getenv("WEBHOOK_SERVICE_NAME")
 	if serviceName == "" {
@@ -146,5 +213,6 @@ func main() {
 		NewDefaultingAdmissionController,
 		NewValidationAdmissionController,
 		NewConfigValidationController,
+		NewConversionController,
 	)
 }

config/200-clusterrole.yaml

@@ -63,6 +63,12 @@ apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: tekton-pipelines-webhook-cluster-access
 rules:
+  # The webhook needs to be able to list and update customresourcedefinitions,
+  # mainly to update the webhook certificates.ku
+  - apiGroups: ["apiextensions.k8s.io"]
+    resources: ["customresourcedefinitions", "customresourcedefinitions/status"]
+    verbs: ["get", "list", "update", "patch", "watch"]
+    # verbs: ["get", "list", "create", "update", "delete", "patch", "watch"]
   - apiGroups: ["admissionregistration.k8s.io"]
     # The webhook performs a reconciliation on these two resources and continuously
     # updates configuration.

config/300-clustertask.yaml

@@ -18,6 +18,15 @@ metadata:
   name: clustertasks.tekton.dev
 spec:
   group: tekton.dev
+  preserveUnknownFields: false
+  validation:
+    openAPIV3Schema:
+      type: object
+      # this is a work around so we don't need to flush out the
+      # schema for each version at this time
+      #
+      # see issue: https://github.com/knative/serving/issues/912
+      x-kubernetes-preserve-unknown-fields: true
   versions:
   - name: v1alpha1
     served: true
@@ -36,4 +45,9 @@ spec:
   # starts to increment
   subresources:
     status: {}
-  version: v1alpha1
+  conversion:
+    strategy: Webhook
+    webhookClientConfig:
+      service:
+        name: tekton-pipelines-webhook
+        namespace: tekton-pipelines

config/300-pipeline.yaml

@@ -18,6 +18,15 @@ metadata:
   name: pipelines.tekton.dev
 spec:
   group: tekton.dev
+  preserveUnknownFields: false
+  validation:
+    openAPIV3Schema:
+      type: object
+      # this is a work around so we don't need to flush out the
+      # schema for each version at this time
+      #
+      # see issue: https://github.com/knative/serving/issues/912
+      x-kubernetes-preserve-unknown-fields: true
   versions:
   - name: v1alpha1
     served: true
@@ -36,4 +45,9 @@ spec:
   # starts to increment
   subresources:
     status: {}
-  version: v1alpha1
+  conversion:
+    strategy: Webhook
+    webhookClientConfig:
+      service:
+        name: tekton-pipelines-webhook
+        namespace: tekton-pipelines

config/300-pipelinerun.yaml

@@ -18,6 +18,15 @@ metadata:
   name: pipelineruns.tekton.dev
 spec:
   group: tekton.dev
+  preserveUnknownFields: false
+  validation:
+    openAPIV3Schema:
+      type: object
+      # this is a work around so we don't need to flush out the
+      # schema for each version at this time
+      #
+      # see issue: https://github.com/knative/serving/issues/912
+      x-kubernetes-preserve-unknown-fields: true
   versions:
   - name: v1alpha1
     served: true
@@ -52,4 +61,9 @@ spec:
   # starts to increment
   subresources:
     status: {}
-  version: v1alpha1
+  conversion:
+    strategy: Webhook
+    webhookClientConfig:
+      service:
+        name: tekton-pipelines-webhook
+        namespace: tekton-pipelines

config/300-task.yaml

@@ -18,6 +18,15 @@ metadata:
   name: tasks.tekton.dev
 spec:
   group: tekton.dev
+  preserveUnknownFields: false
+  validation:
+    openAPIV3Schema:
+      type: object
+      # this is a work around so we don't need to flush out the
+      # schema for each version at this time
+      #
+      # see issue: https://github.com/knative/serving/issues/912
+      x-kubernetes-preserve-unknown-fields: true
   versions:
   - name: v1alpha1
     served: true
@@ -36,4 +45,9 @@ spec:
   # starts to increment
   subresources:
     status: {}
-  version: v1alpha1
+  conversion:
+    strategy: Webhook
+    webhookClientConfig:
+      service:
+        name: tekton-pipelines-webhook
+        namespace: tekton-pipelines

config/300-taskrun.yaml

@@ -18,6 +18,15 @@ metadata:
   name: taskruns.tekton.dev
 spec:
   group: tekton.dev
+  preserveUnknownFields: false
+  validation:
+    openAPIV3Schema:
+      type: object
+      # this is a work around so we don't need to flush out the
+      # schema for each version at this time
+      #
+      # see issue: https://github.com/knative/serving/issues/912
+      x-kubernetes-preserve-unknown-fields: true
   versions:
   - name: v1alpha1
     served: true
@@ -52,4 +61,9 @@ spec:
   # starts to increment
   subresources:
     status: {}
-  version: v1alpha1
+  conversion:
+    strategy: Webhook
+    webhookClientConfig:
+      service:
+        name: tekton-pipelines-webhook
+        namespace: tekton-pipelines

pkg/apis/pipeline/register.go

@@ -16,6 +16,8 @@ limitations under the License.
 
 package pipeline
 
+import "k8s.io/apimachinery/pkg/runtime/schema"
+
 const (
 	// GroupName is the Kubernetes resource group name for Pipeline types.
 	GroupName = "tekton.dev"
@@ -41,3 +43,42 @@ const (
 	// ConditionCheckKey is used as the label identifier for a ConditionCheck
 	ConditionCheckKey = "/conditionCheck"
 )
+
+var (
+	// TaskResource represents a Tekton Task
+	TaskResource = schema.GroupResource{
+		Group:    GroupName,
+		Resource: "tasks",
+	}
+	// ClusterTaskResource represents a Tekton ClusterTask
+	ClusterTaskResource = schema.GroupResource{
+		Group:    GroupName,
+		Resource: "clustertasks",
+	}
+	// TaskRunResource represents a Tekton TaskRun
+	TaskRunResource = schema.GroupResource{
+		Group:    GroupName,
+		Resource: "taskruns",
+	}
+	// PipelineResource represents a Tekton Pipeline
+	PipelineResource = schema.GroupResource{
+		Group:    GroupName,
+		Resource: "pipelines",
+	}
+	// PipelineRunResource represents a Tekton PipelineRun
+	PipelineRunResource = schema.GroupResource{
+		Group:    GroupName,
+		Resource: "pipelineruns",
+	}
+
+	// PipelineResourceResource represents a Tekton PipelineResource
+	PipelineResourceResource = schema.GroupResource{
+		Group:    GroupName,
+		Resource: "pipelineresources",
+	}
+	// ConditionResource represents a Tekton Condition
+	ConditionResource = schema.GroupResource{
+		Group:    GroupName,
+		Resource: "conditions",
+	}
+)