feat: kubesphere 4.0 (#6115)

* feat: kubesphere 4.0

Signed-off-by: ci-bot <ci-bot@kubesphere.io>

* feat: kubesphere 4.0

Signed-off-by: ci-bot <ci-bot@kubesphere.io>

---------

Signed-off-by: ci-bot <ci-bot@kubesphere.io>
Co-authored-by: ks-ci-bot <ks-ci-bot@example.com>
Co-authored-by: joyceliu <joyceliu@yunify.com>

vendor/sigs.k8s.io/kustomize/kyaml/yaml/merge2/merge2.go

@@ -1,7 +1,7 @@
 // Copyright 2019 The Kubernetes Authors.
 // SPDX-License-Identifier: Apache-2.0
 
-// Package merge contains libraries for merging fields from one RNode to another
+// Package merge2 contains libraries for merging fields from one RNode to another
 // RNode
 package merge2
 
@@ -20,7 +20,7 @@ func Merge(src, dest *yaml.RNode, mergeOptions yaml.MergeOptions) (*yaml.RNode,
 	}.Walk()
 }
 
-// Merge parses the arguments, and merges fields from srcStr into destStr.
+// MergeStrings parses the arguments, and merges fields from srcStr into destStr.
 func MergeStrings(srcStr, destStr string, infer bool, mergeOptions yaml.MergeOptions) (string, error) {
 	src, err := yaml.Parse(srcStr)
 	if err != nil {
@@ -64,6 +64,12 @@ func (m Merger) VisitMap(nodes walk.Sources, s *openapi.ResourceSchema) (*yaml.R
 			return walk.ClearNode, nil
 		}
 
+		// If Origin is missing, preserve explicitly set null in Dest ("null", "~", etc)
+		if nodes.Origin().IsNil() && !nodes.Dest().IsNil() && len(nodes.Dest().YNode().Value) > 0 {
+			// Return a new node so that it won't have a "!!null" tag and therefore won't be cleared.
+			return yaml.NewScalarRNode(nodes.Dest().YNode().Value), nil
+		}
+
 		return nodes.Origin(), nil
 	}
 	if nodes.Origin().IsTaggedNull() {