Remove dependence on kustomize/setters2

The package setters2 has been removed from kustomize:
kubernetes-sigs/kustomize#5291

This commit removes the need to import setters2, by reproducing the
last link with that code, which is a minor parsing helper.

I have not changed the comment explaining what was changed from the
original, since it's still accurate. The parsing func is a buried
detail.

Signed-off-by: Michael Bridgen <[email protected]>

pkg/update/filter.go

@@ -17,11 +17,12 @@ limitations under the License.
 package update
 
 import (
+	"encoding/json"
+
 	"github.com/go-logr/logr"
 	"k8s.io/kube-openapi/pkg/validation/spec"
 	"sigs.k8s.io/kustomize/kyaml/fieldmeta"
 	"sigs.k8s.io/kustomize/kyaml/openapi"
-	"sigs.k8s.io/kustomize/kyaml/setters2"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
@@ -112,8 +113,17 @@ func accept(v visitor, object *yaml.RNode, p string, settersSchema *spec.Schema)
 	return nil
 }
 
+type setter struct {
+	Name  string `json:"name"`
+	Value string `json:"value"`
+}
+
+type extension struct {
+	Setter *setter `json:"setter,omitempty"`
+}
+
 // set applies the value from ext to field
-func (s *SetAllCallback) set(field *yaml.RNode, ext *setters2.CliExtension, sch *spec.Schema) (bool, error) {
+func (s *SetAllCallback) set(field *yaml.RNode, ext *extension, sch *spec.Schema) (bool, error) {
 	// check full setter
 	if ext.Setter == nil {
 		return false, nil
@@ -139,7 +149,7 @@ func (s *SetAllCallback) visitScalar(object *yaml.RNode, p string, fieldSchema *
 		return nil
 	}
 	// get the openAPI for this field describing how to apply the setter
-	ext, err := setters2.GetExtFromSchema(fieldSchema.Schema)
+	ext, err := getExtFromSchema(fieldSchema.Schema)
 	if err != nil {
 		return err
 	}
@@ -152,3 +162,19 @@ func (s *SetAllCallback) visitScalar(object *yaml.RNode, p string, fieldSchema *
 	_, err = s.set(object, ext, fieldSchema.Schema)
 	return err
 }
+
+func getExtFromSchema(schema *spec.Schema) (*extension, error) {
+	cep := schema.VendorExtensible.Extensions[K8sCliExtensionKey]
+	if cep == nil {
+		return nil, nil
+	}
+	b, err := json.Marshal(cep)
+	if err != nil {
+		return nil, err
+	}
+	val := &extension{}
+	if err := json.Unmarshal(b, val); err != nil {
+		return nil, err
+	}
+	return val, nil
+}

pkg/update/setters.go

@@ -29,13 +29,15 @@ import (
 	"sigs.k8s.io/kustomize/kyaml/kio/kioutil"
 	"sigs.k8s.io/kustomize/kyaml/openapi"
 	"sigs.k8s.io/kustomize/kyaml/sets"
-	"sigs.k8s.io/kustomize/kyaml/setters2"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 
 	imagev1_reflect "github.com/fluxcd/image-reflector-controller/api/v1beta2"
 )
 
 const (
+	// This is preserved from setters2
+	K8sCliExtensionKey = "x-k8s-cli"
+
 	// SetterShortHand is a shorthand that can be used to mark
 	// setters; instead of
 	// # { "$ref": "#/definitions/
@@ -256,7 +258,7 @@ func setAll(schema *spec.Schema, tracelog logr.Logger, callback func(file, sette
 func setterSchema(name, value string) spec.Schema {
 	schema := spec.StringProperty()
 	schema.Extensions = map[string]interface{}{}
-	schema.Extensions.Add(setters2.K8sCliExtensionKey, map[string]interface{}{
+	schema.Extensions.Add(K8sCliExtensionKey, map[string]interface{}{
 		"setter": map[string]string{
 			"name":  name,
 			"value": value,