Add cascadeDelete option to the Image and Build objects

api/openapi-spec/swagger.json

@@ -5591,6 +5591,9 @@
         "cache": {
           "$ref": "#/definitions/kpack.build.v1alpha2.BuildCacheConfig"
         },
+        "cascadeDelete": {
+          "type": "boolean"
+        },
         "cnbBindings": {
           "type": "array",
           "items": {
@@ -6724,6 +6727,9 @@
         "cache": {
           "$ref": "#/definitions/kpack.build.v1alpha2.ImageCacheConfig"
         },
+        "cascadeDelete": {
+          "type": "boolean"
+        },
         "cosign": {
           "$ref": "#/definitions/kpack.build.v1alpha2.CosignConfig"
         },
@@ -7340,6 +7346,9 @@
         "url"
       ],
       "properties": {
+        "auth": {
+          "type": "string"
+        },
         "stripComponents": {
           "type": "integer",
           "format": "int64"

cmd/controller/main.go

@@ -227,7 +227,7 @@ func main() {
 		SystemServiceAccountName: cfg.SystemServiceAccount,
 	}
 
-	buildController := build.NewController(ctx, options, k8sClient, buildInformer, podInformer, metadataRetriever, buildpodGenerator, podProgressLogger, keychainFactory, &slsaAttester, secretFetcher, featureFlags)
+	buildController := build.NewController(ctx, options, k8sClient, buildInformer, podInformer, metadataRetriever, buildpodGenerator, podProgressLogger, keychainFactory, &slsaAttester, secretFetcher, featureFlags, &registry.Client{})
 	imageController := image.NewController(ctx, options, k8sClient, imageInformer, buildInformer, duckBuilderInformer, sourceResolverInformer, pvcInformer, cfg.EnablePriorityClasses)
 	sourceResolverController := sourceresolver.NewController(ctx, options, sourceResolverInformer, gitResolver, blobResolver, registryResolver)
 	builderController, builderResync := builder.NewController(ctx, options, builderInformer, builderCreator, keychainFactory, clusterStoreInformer, buildpackInformer, clusterBuildpackInformer, clusterStackInformer, secretFetcher)

docs/build.md

@@ -31,6 +31,7 @@ spec:
     git:
       url: https://github.com/buildpack/sample-java-app.git
       revision: main
+  cascadeDelete: true
   activeDeadlineSeconds: 1800
   env:
   - name: "JAVA_BP_ENV"
@@ -72,10 +73,11 @@ spec:
 - `env`: Optional list of build time environment variables.
 - `defaultProcess`: The [default process type](https://buildpacks.io/docs/app-developer-guide/run-an-app/) for the built OCI image
 - `projectDescriptorPath`: Path to the [project descriptor file](https://buildpacks.io/docs/reference/config/project-descriptor/) relative to source root dir or `subPath` if set. If unset, kpack will look for `project.toml` at the root dir or `subPath` if set.
+- `cascadeDelete`: If set to `true`, produced image will garbage collected from the registry upon object deletion.
 - `resources`: Optional configurable resource limits on `CPU` and `memory`.
 - `tolerations`: Optional configurable pod spec tolerations
 - `nodeSelector`: Optional configurable pod spec nodeSelector
-- `affinity`: Optional configurabl pod spec affinity
+- `affinity`: Optional configurable pod spec affinity
 
 > Note: All fields on a build are immutable. Instead of updating a build, create a new one.
 

docs/image.md

@@ -22,6 +22,7 @@ The following defines the relevant fields of the `image` resource spec in more d
 - `build`: Configuration that is passed to every image build. See [Build Configuration](#build-config) section below.
 - `defaultProcess`: The [default process type](https://buildpacks.io/docs/app-developer-guide/run-an-app/) for the built OCI image
 - `projectDescriptorPath`: Path to the [project descriptor file](https://buildpacks.io/docs/reference/config/project-descriptor/) relative to source root dir or `subPath` if set. If unset, kpack will look for `project.toml` at the root dir or `subPath` if set.
+- `cascadeDelete`: If set to `true`, produced image will garbage collected from the registry upon `Build` objects deletion.
 - `cosign`: Configuration for additional cosign image signing. See [Cosign Configuration](#cosign-config) section below.
 
 ### <a id='tags-config'></a> Configuring Tags

pkg/apis/build/v1alpha2/build.go

@@ -156,6 +156,10 @@ func (b *Build) DefaultProcess() string {
 	return b.Spec.DefaultProcess
 }
 
+func (b *Build) CascadeDeleteImage() bool {
+	return b.Spec.CascadeDelete
+}
+
 var buildSteps = map[string]struct{}{
 	PrepareContainerName:    {},
 	AnalyzeContainerName:    {},

pkg/apis/build/v1alpha2/build_types.go

@@ -78,6 +78,8 @@ type BuildSpec struct {
 	SchedulerName     string              `json:"schedulerName,omitempty"`
 	PriorityClassName string              `json:"priorityClassName,omitempty"`
 	CreationTime      string              `json:"creationTime,omitempty"`
+	// +optional
+	CascadeDelete bool `json:"cascadeDelete,omitempty"`
 }
 
 func (bs *BuildSpec) RegistryCacheTag() string {

pkg/apis/build/v1alpha2/image_builds.go

@@ -81,6 +81,7 @@ func (im *Image) Build(sourceResolver *SourceResolver, builder BuilderResource,
 			PriorityClassName:     priorityClass,
 			ActiveDeadlineSeconds: im.BuildTimeout(),
 			CreationTime:          im.Spec.creationTime(),
+			CascadeDelete:         im.Spec.CascadeDelete,
 		},
 	}
 }

pkg/apis/build/v1alpha2/image_types.go

@@ -60,6 +60,8 @@ type ImageSpec struct {
 	DefaultProcess           string                            `json:"defaultProcess,omitempty"`
 	// +listType
 	AdditionalTags []string `json:"additionalTags,omitempty"`
+	// +optional
+	CascadeDelete bool `json:"cascadeDelete,omitempty"`
 }
 
 // +k8s:openapi-gen=true
@@ -72,13 +74,13 @@ type ImageBuild struct {
 	Env       []corev1.EnvVar             `json:"env,omitempty"`
 	Resources corev1.ResourceRequirements `json:"resources,omitempty"`
 	// +listType
-	Tolerations          []corev1.Toleration `json:"tolerations,omitempty"`
-	NodeSelector         map[string]string   `json:"nodeSelector,omitempty"`
-	Affinity             *corev1.Affinity    `json:"affinity,omitempty"`
-	RuntimeClassName     *string             `json:"runtimeClassName,omitempty"`
-	SchedulerName        string              `json:"schedulerName,omitempty"`
-	BuildTimeout         *int64              `json:"buildTimeout,omitempty"`
-	CreationTime         string              `json:"creationTime,omitempty"`
+	Tolerations      []corev1.Toleration `json:"tolerations,omitempty"`
+	NodeSelector     map[string]string   `json:"nodeSelector,omitempty"`
+	Affinity         *corev1.Affinity    `json:"affinity,omitempty"`
+	RuntimeClassName *string             `json:"runtimeClassName,omitempty"`
+	SchedulerName    string              `json:"schedulerName,omitempty"`
+	BuildTimeout     *int64              `json:"buildTimeout,omitempty"`
+	CreationTime     string              `json:"creationTime,omitempty"`
 }
 
 // +k8s:openapi-gen=true

pkg/reconciler/build/build.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"slices"
 
 	"github.com/google/go-containerregistry/pkg/authn"
 	ggcrv1 "github.com/google/go-containerregistry/pkg/v1"
@@ -41,6 +42,7 @@ const (
 	Kind            = "Build"
 	k8sOSLabel      = "kubernetes.io/os"
 	ReasonCompleted = "Completed"
+	BuildFinalizer  = "builds.kpack.io/finalizer"
 )
 
 //go:generate counterfeiter . MetadataRetriever
@@ -69,6 +71,11 @@ type SecretFetcher interface {
 	SecretsForSystemServiceAccount(context.Context) ([]*corev1.Secret, error)
 }
 
+//go:generate counterfeiter . RegistryClient
+type RegistryClient interface {
+	Delete(keychain authn.Keychain, repoName string) error
+}
+
 func NewController(
 	ctx context.Context, opt reconciler.Options, k8sClient k8sclient.Interface,
 	informer buildinformers.BuildInformer, podInformer corev1Informers.PodInformer,
@@ -78,6 +85,7 @@ func NewController(
 	attester SLSAAttester,
 	secretFetcher SecretFetcher,
 	featureFlags config.FeatureFlags,
+	registryClient RegistryClient,
 ) *controller.Impl {
 	c := &Reconciler{
 		Client:            opt.Client,
@@ -91,6 +99,7 @@ func NewController(
 		Attester:          attester,
 		SecretFetcher:     secretFetcher,
 		FeatureFlags:      featureFlags,
+		RegistryClient:    registryClient,
 	}
 
 	logger := opt.Logger.With(
@@ -121,6 +130,7 @@ type Reconciler struct {
 	Attester          SLSAAttester
 	SecretFetcher     SecretFetcher
 	FeatureFlags      config.FeatureFlags
+	RegistryClient    RegistryClient
 }
 
 func (c *Reconciler) Reconcile(ctx context.Context, key string) error {
@@ -136,6 +146,14 @@ func (c *Reconciler) Reconcile(ctx context.Context, key string) error {
 		return err
 	}
 
+	if !build.DeletionTimestamp.IsZero() {
+		return c.finalize(ctx, build)
+	}
+
+	if err := c.setFinalizer(ctx, build); err != nil {
+		return err
+	}
+
 	build = build.DeepCopy()
 	build.SetDefaults(ctx)
 
@@ -352,6 +370,64 @@ func (c *Reconciler) conditionForPod(pod *corev1.Pod, stepsCompleted []string) c
 	}
 }
 
+func (c *Reconciler) finalize(ctx context.Context, build *buildapi.Build) error {
+	if !slices.Contains(build.GetFinalizers(), BuildFinalizer) {
+		return nil
+	}
+
+	if build.Finished() {
+		keychain, err := c.KeychainFactory.KeychainForSecretRef(ctx, registry.SecretRef{
+			ServiceAccount: build.Spec.ServiceAccountName,
+			Namespace:      build.Namespace,
+		})
+		if err != nil {
+			return err
+		}
+
+		if err := c.RegistryClient.Delete(keychain, build.Status.LatestImage); err != nil {
+			//logger.Printf(errors.Wrapf(err, "Could not delete image %q", build.Status.LatestImage))
+		}
+	}
+
+	mergePatch := map[string]interface{}{
+		"metadata": map[string]interface{}{
+			"finalizers": slices.DeleteFunc(build.GetFinalizers(), func(f string) bool {
+				return f == BuildFinalizer
+			}),
+			"resourceVersion": build.ResourceVersion,
+		},
+	}
+
+	patch, err := json.Marshal(mergePatch)
+	if err != nil {
+		return err
+	}
+
+	_, err = c.Client.KpackV1alpha2().Builds(build.Namespace).Patch(ctx, build.Name, types.MergePatchType, patch, metav1.PatchOptions{})
+	return err
+}
+
+func (c *Reconciler) setFinalizer(ctx context.Context, build *buildapi.Build) error {
+	if slices.Contains(build.GetFinalizers(), BuildFinalizer) || !build.CascadeDeleteImage() {
+		return nil
+	}
+
+	mergePatch := map[string]interface{}{
+		"metadata": map[string]interface{}{
+			"finalizers":      append(build.GetFinalizers(), BuildFinalizer),
+			"resourceVersion": build.ResourceVersion,
+		},
+	}
+
+	patch, err := json.Marshal(mergePatch)
+	if err != nil {
+		return err
+	}
+
+	_, err = c.Client.KpackV1alpha2().Builds(build.Namespace).Patch(ctx, build.Name, types.MergePatchType, patch, metav1.PatchOptions{})
+	return err
+}
+
 func stepStates(pod *corev1.Pod) []corev1.ContainerState {
 	states := make([]corev1.ContainerState, 0, len(buildapi.BuildSteps()))
 	for _, s := range append(pod.Status.InitContainerStatuses, pod.Status.ContainerStatuses...) {
@@ -442,17 +518,17 @@ func (c *Reconciler) attestBuild(ctx context.Context, build *buildapi.Build, bui
 		signers[i] = s
 	}
 
-	buildId := slsa.UnsignedBuildID
+	buildID := slsa.UnsignedBuildID
 	if len(signers) > 0 {
-		buildId = slsa.SignedBuildID
+		buildID = slsa.SignedBuildID
 	}
 
 	deps, err := c.attestBuildDeps(ctx, build, pod, secrets)
 	if err != nil {
 		return "", fmt.Errorf("failed to gather build deps: %v", err)
 	}
 
-	statement, err := c.Attester.AttestBuild(build, buildMetadata, pod, keychain, buildId, deps...)
+	statement, err := c.Attester.AttestBuild(build, buildMetadata, pod, keychain, buildID, deps...)
 	if err != nil {
 		return "", fmt.Errorf("failed to generate statement: %v", err)
 	}