✨ Added RemoveTransformer

Uses the selectors used for patches.

Author: antoinemartin

pkg/extras/RemoveTransformer.go

@@ -0,0 +1,46 @@
+package extras
+
+import (
+	"fmt"
+
+	"sigs.k8s.io/kustomize/api/resmap"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/errors"
+	"sigs.k8s.io/yaml"
+)
+
+type RemoveTransformerPlugin struct {
+	Targets []*types.Selector `json:"targets,omitempty" yaml:"targets,omitempty"`
+}
+
+func (p *RemoveTransformerPlugin) Config(
+	h *resmap.PluginHelpers, c []byte) (err error) {
+	err = yaml.Unmarshal(c, p)
+	if err != nil {
+		return err
+	}
+	return err
+}
+
+func (p *RemoveTransformerPlugin) Transform(m resmap.ResMap) error {
+	if p.Targets == nil {
+		return fmt.Errorf("must specify at least one target")
+	}
+	for _, t := range p.Targets {
+		resources, err := m.Select(*t)
+		if err != nil {
+			return errors.WrapPrefixf(err, "while selecting target %s", t.String())
+		}
+		for _, r := range resources {
+			err = m.Remove(r.CurId())
+			if err != nil {
+				return errors.WrapPrefixf(err, "while removing resource %s", r.CurId().String())
+			}
+		}
+	}
+	return nil
+}
+
+func NewRemoveTransformerPlugin() resmap.TransformerPlugin {
+	return &RemoveTransformerPlugin{}
+}

pkg/plugins/builtinplugintype_string.go

@@ -38,6 +38,7 @@ const (
 	HelmChartInflationGenerator
 	ReplacementTransformer
 	GitConfigMapGenerator
+	RemoveTransformer
 )
 
 var stringToBuiltinPluginTypeMap map[string]BuiltinPluginType
@@ -109,6 +110,7 @@ var TransformerFactories = map[BuiltinPluginType]func() resmap.TransformerPlugin
 	ReplacementTransformer:         extras.NewExtendedReplacementTransformerPlugin,
 	ReplicaCountTransformer:        builtins.NewReplicaCountTransformerPlugin,
 	ValueAddTransformer:            builtins.NewValueAddTransformerPlugin,
+	RemoveTransformer:              extras.NewRemoveTransformerPlugin,
 	// Do not wired SortOrderTransformer as a builtin plugin.
 	// We only want it to be available in the top-level kustomization.
 	// See: https://github.com/kubernetes-sigs/kustomize/issues/3913

pkg/plugins/factories.go

@@ -3,7 +3,7 @@ kind: ReplacementTransformer
 metadata:
   name: replacement-transformer
   annotations:
-    config.kubernetes.io/prune-local: "true"
+    ## config.kaweezle.com/prune-local: "true"
     config.kubernetes.io/function: |
       exec:
         path: ../../krmfnbuiltin

tests/multi-replacement/functions/02_multi-transformation.yaml

@@ -0,0 +1,10 @@
+apiVersion: builtin
+kind: RemoveTransformer
+metadata:
+  name: replacement-transformer
+  annotations:
+    config.kubernetes.io/function: |
+      exec:
+        path: ../../krmfnbuiltin
+targets:
+  - annotationSelector: config.kaweezle.com/local-config