WIP residPackage

pkg/ifc/generationbehavior.go

@@ -0,0 +1,59 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package ifc
+
+// GenerationBehavior specifies generation behavior of configmaps, secrets and maybe other resources.
+type GenerationBehavior int
+
+const (
+	// BehaviorUnspecified is an Unspecified behavior; typically treated as a Create.
+	BehaviorUnspecified GenerationBehavior = iota
+	// BehaviorCreate makes a new resource.
+	BehaviorCreate
+	// BehaviorReplace replaces a resource.
+	BehaviorReplace
+	// BehaviorMerge attempts to merge a new resource with an existing resource.
+	BehaviorMerge
+)
+
+// String converts a GenerationBehavior to a string.
+func (b GenerationBehavior) String() string {
+	switch b {
+	case BehaviorReplace:
+		return "replace"
+	case BehaviorMerge:
+		return "merge"
+	case BehaviorCreate:
+		return "create"
+	default:
+		return "unspecified"
+	}
+}
+
+// NewGenerationBehavior converts a string to a GenerationBehavior.
+func NewGenerationBehavior(s string) GenerationBehavior {
+	switch s {
+	case "replace":
+		return BehaviorReplace
+	case "merge":
+		return BehaviorMerge
+	case "create":
+		return BehaviorCreate
+	default:
+		return BehaviorUnspecified
+	}
+}

pkg/ifc/ifc.go

@@ -31,3 +31,15 @@ type Validator interface {
 	MakeLabelValidator() func(map[string]string) error
 	ValidateNamespace(string) []string
 }
+
+// Loader interface exposes methods to read bytes.
+type Loader interface {
+	// Root returns the root location for this Loader.
+	Root() string
+	// New returns Loader located at newRoot.
+	New(newRoot string) (Loader, error)
+	// Load returns the bytes read from the location or an error.
+	Load(location string) ([]byte, error)
+	// Cleanup cleans the loader
+	Cleanup() error
+}