Support for Kustomize based PostRenderer

Add support for Kustomize based PostRenderer as built-in post renderer.

Signed-off-by: Alexander Berger <alex-berger@gmx.ch>

api/go.mod

@@ -8,4 +8,5 @@ require (
 	k8s.io/apiextensions-apiserver v0.20.2
 	k8s.io/apimachinery v0.20.2
 	sigs.k8s.io/controller-runtime v0.8.0
+	sigs.k8s.io/kustomize/api v0.7.2
 )

api/v2beta1/helmrelease_types.go

@@ -32,6 +32,37 @@ import (
 const HelmReleaseKind = "HelmRelease"
 const HelmReleaseFinalizer = "finalizers.fluxcd.io"
 
+// PatchJSON6902 contains a JSON patch and the target it applies to.
+type PatchJSON6902 struct {
+	// Patch is the YAML content of a patch.
+	Patch []apiextensionsv1.JSON `json:"patch,omitempty" yaml:"patch,omitempty"`
+
+	// Target points to the resources that the patch is applied to.
+	Target Selector `json:"target,omitempty" yaml:"target,omitempty"`
+}
+
+// Kustomize Helm PostRenderer specification.
+type Kustomize struct {
+	// Strategic merge patches, defined as inline YAML objects.
+	// +optional
+	PatchesStrategicMerge []apiextensionsv1.JSON `json:"patchesStrategicMerge,omitempty"`
+	// JSON 6902 patches, defined as inline YAML objects.
+	// +optional
+	PatchesJSON6902 []PatchJSON6902 `json:"patchesJson6902,omitempty"`
+	// Images is a list of (image name, new name, new tag or digest)
+	// for changing image names, tags or digests. This can also be achieved with a
+	// patch, but this operator is simpler to specify.
+	// +optional
+	Images []Image `json:"images,omitempty" yaml:"images,omitempty"`
+}
+
+// PostRenderer contains a Helm PostRenderer specification.
+type PostRenderer struct {
+	// Kustomization to apply as PostRenderer.
+	// +optional
+	Kustomize *Kustomize `json:"kustomize,omitempty"`
+}
+
 // HelmReleaseSpec defines the desired state of a Helm release.
 type HelmReleaseSpec struct {
 	// Chart defines the template of the v1beta1.HelmChart that should be created
@@ -125,6 +156,11 @@ type HelmReleaseSpec struct {
 	// Values holds the values for this Helm release.
 	// +optional
 	Values *apiextensionsv1.JSON `json:"values,omitempty"`
+
+	// PostRenderers holds an array of Helm PostRenderers, which will be applied in order
+	// of their definition.
+	// +optional
+	PostRenderers []PostRenderer `json:"postRenderers,omitempty"`
 }
 
 // GetInstall returns the configuration for Helm install actions for the

api/v2beta1/kustomization_types.go

@@ -0,0 +1,45 @@
+package v2beta1
+
+// Image contains an image name, a new name, a new tag or digest,
+// which will replace the original name and tag.
+type Image struct {
+	// Name is a tag-less image name.
+	Name string `json:"name,omitempty" yaml:"name,omitempty"`
+
+	// NewName is the value used to replace the original name.
+	NewName string `json:"newName,omitempty" yaml:"newName,omitempty"`
+
+	// NewTag is the value used to replace the original tag.
+	NewTag string `json:"newTag,omitempty" yaml:"newTag,omitempty"`
+
+	// Digest is the value used to replace the original image tag.
+	// If digest is present NewTag value is ignored.
+	Digest string `json:"digest,omitempty" yaml:"digest,omitempty"`
+}
+
+// Gvk identifies a Kubernetes API type.
+// https://github.com/kubernetes/community/blob/master/contributors/design-proposals/api-machinery/api-group.md
+type Gvk struct {
+	Group   string `json:"group,omitempty" yaml:"group,omitempty"`
+	Version string `json:"version,omitempty" yaml:"version,omitempty"`
+	Kind    string `json:"kind,omitempty" yaml:"kind,omitempty"`
+}
+
+// Selector specifies a set of resources.
+// Any resource that matches intersection of all conditions
+// is included in this set.
+type Selector struct {
+	Gvk       `json:",inline,omitempty" yaml:",inline,omitempty"`
+	Namespace string `json:"namespace,omitempty" yaml:"namespace,omitempty"`
+	Name      string `json:"name,omitempty" yaml:"name,omitempty"`
+
+	// AnnotationSelector is a string that follows the label selection expression
+	// https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#api
+	// It matches with the resource annotations.
+	AnnotationSelector string `json:"annotationSelector,omitempty" yaml:"annotationSelector,omitempty"`
+
+	// LabelSelector is a string that follows the label selection expression
+	// https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#api
+	// It matches with the resource labels.
+	LabelSelector string `json:"labelSelector,omitempty" yaml:"labelSelector,omitempty"`
+}