new command kustomize edit add buildmetadata (#4413)

* new command kustomize edit add buildmetadata

* new commands kustomize edit set buildmetadata and kustomize edit remove buildmetadata

kustomize/commands/internal/kustfile/kustomizationfile.go

@@ -67,6 +67,7 @@ func determineFieldOrder() []string {
 		"Inventory",
 		"Components",
 		"OpenAPI",
+		"BuildMetadata",
 	}
 
 	// Add deprecated fields here.

kustomize/commands/internal/kustfile/kustomizationfile_test.go

@@ -49,6 +49,7 @@ func TestFieldOrder(t *testing.T) {
 		"Inventory",
 		"Components",
 		"OpenAPI",
+		"BuildMetadata",
 	}
 	actual := determineFieldOrder()
 	if len(expected) != len(actual) {

kustomize/commands/internal/util/util_test.go

@@ -1,3 +1,6 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package util
 
 import (

kustomize/commands/internal/util/validate.go

@@ -0,0 +1,31 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package util
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kustomize/v4/commands/internal/kustfile"
+)
+
+type BuildMetadataValidator struct{}
+
+func (b *BuildMetadataValidator) Validate(args []string) ([]string, error) {
+	if len(args) == 0 {
+		return nil, errors.New("must specify a buildMetadata option")
+	}
+	if len(args) > 1 {
+		return nil, fmt.Errorf("too many arguments: %s; to provide multiple buildMetadata options, please separate options by comma", args)
+	}
+	opts := strings.Split(args[0], ",")
+	for _, opt := range opts {
+		if !kustfile.StringInSlice(opt, types.BuildMetadataOptions) {
+			return nil, fmt.Errorf("invalid buildMetadata option: %s", opt)
+		}
+	}
+	return opts, nil
+}