parse custom schema only once when necessary

kyaml/openapi/openapi.go

@@ -44,10 +44,9 @@ type openapiData struct {
 	// Kubernetes schema as part of the global schema
 	noUseBuiltInSchema bool
 
-	// currentOpenAPIVersion stores the version if the kubernetes openapi data
-	// that is currently stored as the schema, so that we only reparse the
-	// schema when necessary (to speed up performance)
-	currentOpenAPIVersion string
+	// schemaInit stores whether or not we've parsed the schema already,
+	// so that we only reparse the when necessary (to speed up performance)
+	schemaInit bool
 }
 
 // ResourceSchema wraps the OpenAPI Schema.
@@ -477,27 +476,28 @@ func GetSchemaVersion() string {
 
 // initSchema parses the json schema
 func initSchema() {
+	if globalSchema.schemaInit {
+		return
+	}
+	globalSchema.schemaInit = true
+
 	if customSchema != nil {
-		ResetOpenAPI()
 		err := parse(customSchema)
 		if err != nil {
 			panic("invalid schema file")
 		}
-		if err := parse(kustomizationapi.MustAsset(kustomizationAPIAssetName)); err != nil {
+		if err = parse(kustomizationapi.MustAsset(kustomizationAPIAssetName)); err != nil {
 			// this should never happen
 			panic(err)
 		}
 		return
 	}
 
-	currentVersion := kubernetesOpenAPIVersion
-	if currentVersion == "" {
-		currentVersion = kubernetesOpenAPIDefaultVersion
-	}
-	if globalSchema.currentOpenAPIVersion != currentVersion {
-		parseBuiltinSchema(currentVersion)
+	if kubernetesOpenAPIVersion == "" {
+		parseBuiltinSchema(kubernetesOpenAPIDefaultVersion)
+	} else {
+		parseBuiltinSchema(kubernetesOpenAPIVersion)
 	}
-	globalSchema.currentOpenAPIVersion = currentVersion
 }
 
 // parseBuiltinSchema calls parse to parse the json schemas