Start api directory, which will become a module.

api/types/fix.go

@@ -0,0 +1,51 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package types
+
+import (
+	"log"
+	"regexp"
+
+	"sigs.k8s.io/yaml"
+)
+
+// FixKustomizationPreUnmarshalling modies the raw data
+// before marshalling - e.g. changes old field names to
+// new field names.
+func FixKustomizationPreUnmarshalling(data []byte) []byte {
+	deprecateFieldsMap := map[string]string{
+		"imageTags:": "images:",
+	}
+	for oldname, newname := range deprecateFieldsMap {
+		pattern := regexp.MustCompile(oldname)
+		data = pattern.ReplaceAll(data, []byte(newname))
+	}
+	if useLegacyPatch(data) {
+		pattern := regexp.MustCompile("patches:")
+		data = pattern.ReplaceAll(data, []byte("patchesStrategicMerge:"))
+	}
+	return data
+}
+
+func useLegacyPatch(data []byte) bool {
+	found := false
+	var object map[string]interface{}
+	err := yaml.Unmarshal(data, &object)
+	if err != nil {
+		log.Fatalf("invalid content from %s\n", string(data))
+	}
+	if rawPatches, ok := object["patches"]; ok {
+		patches, ok := rawPatches.([]interface{})
+		if !ok {
+			log.Fatalf("invalid patches from %v\n", rawPatches)
+		}
+		for _, p := range patches {
+			_, ok := p.(string)
+			if ok {
+				found = true
+			}
+		}
+	}
+	return found
+}