update vendor

Signed-off-by: Roland.Ma <rolandma@yunify.com>

vendor/sigs.k8s.io/kustomize/kyaml/comments/comments.go

@@ -0,0 +1,78 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package comments
+
+import (
+	"sigs.k8s.io/kustomize/kyaml/openapi"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+	"sigs.k8s.io/kustomize/kyaml/yaml/walk"
+)
+
+// CopyComments recursively copies the comments on fields in from to fields in to
+func CopyComments(from, to *yaml.RNode) error {
+	copy(from, to)
+	// walk the fields copying comments
+	_, err := walk.Walker{
+		Sources:            []*yaml.RNode{from, to},
+		Visitor:            &copier{},
+		VisitKeysAsScalars: true}.Walk()
+	return err
+}
+
+// copier implements walk.Visitor, and copies comments to fields shared between 2 instances
+// of a resource
+type copier struct{}
+
+func (c *copier) VisitMap(s walk.Sources, _ *openapi.ResourceSchema) (*yaml.RNode, error) {
+	copy(s.Dest(), s.Origin())
+	return s.Dest(), nil
+}
+
+func (c *copier) VisitScalar(s walk.Sources, _ *openapi.ResourceSchema) (*yaml.RNode, error) {
+	to := s.Origin()
+	// TODO: File a bug with upstream yaml to handle comments for FoldedStyle scalar nodes
+	// Hack: convert FoldedStyle scalar node to DoubleQuotedStyle as the line comments are
+	// being serialized without space
+	// https://github.com/GoogleContainerTools/kpt/issues/766
+	if to != nil && to.Document().Style == yaml.FoldedStyle {
+		to.Document().Style = yaml.DoubleQuotedStyle
+	}
+
+	copy(s.Dest(), to)
+	return s.Dest(), nil
+}
+
+func (c *copier) VisitList(s walk.Sources, _ *openapi.ResourceSchema, _ walk.ListKind) (
+	*yaml.RNode, error) {
+	copy(s.Dest(), s.Origin())
+	destItems := s.Dest().Content()
+	originItems := s.Origin().Content()
+
+	for i := 0; i < len(destItems) && i < len(originItems); i++ {
+		dest := destItems[i]
+		origin := originItems[i]
+
+		if dest.Value == origin.Value {
+			copy(yaml.NewRNode(dest), yaml.NewRNode(origin))
+		}
+	}
+
+	return s.Dest(), nil
+}
+
+// copy copies the comment from one field to another
+func copy(from, to *yaml.RNode) {
+	if from == nil || to == nil {
+		return
+	}
+	if to.Document().LineComment == "" {
+		to.Document().LineComment = from.Document().LineComment
+	}
+	if to.Document().HeadComment == "" {
+		to.Document().HeadComment = from.Document().HeadComment
+	}
+	if to.Document().FootComment == "" {
+		to.Document().FootComment = from.Document().FootComment
+	}
+}