implements to replacements value in the structured data

Author: koba1t

api/filters/replacement/replacement_test.go

@@ -1835,6 +1835,44 @@ spec:
     name: sidecar
     imagePullPolicy: OnFailure
 `,
+		},
+		"replacement contain jsonfield": {
+			input: `apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: target-configmap
+data:
+  config.json: |-
+    {
+      "config": {
+        "id": "42",
+        "hostname": "REPLACE_TARGET_HOSTNAME"
+      }
+    }
+`,
+			replacements: `replacements:
+- source:
+    kind: ConfigMap
+    name: target-configmap
+    fieldPath: metadata.name
+  targets:
+  - select:
+      kind: ConfigMap
+    fieldPaths:
+    - data.config\.json.config.hostname
+`,
+			expected: `apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: target-configmap
+data:
+  config.json: |-
+    {
+      "config": {
+        "id": "42",
+        "hostname": "target-configmap"
+      }
+    }`,
 		},
 		"multiple field paths in target": {
 			input: `apiVersion: v1
@@ -2779,7 +2817,7 @@ spec:
           name: myingress
         fieldPaths:
           - spec.tls.0.hosts.0
-          - spec.tls.0.secretName          
+          - spec.tls.0.secretName
         options:
           create: true
 `,

kyaml/yaml/fns.go

@@ -830,6 +830,10 @@ func (e *InvalidNodeKindError) Error() string {
 	return msg
 }
 
+func (e *InvalidNodeKindError) Unwrap() error {
+	return errors.Errorf("InvalidNodeKindError")
+}
+
 func (e *InvalidNodeKindError) ActualNodeKind() Kind {
 	return e.node.YNode().Kind
 }

kyaml/yaml/match.go

@@ -137,10 +137,17 @@ func (p *PathMatcher) visitEveryElem(elem *RNode) error {
 func (p *PathMatcher) doField(rn *RNode) (*RNode, error) {
 	// lookup the field
 	field, err := rn.Pipe(Get(p.Path[0]))
-	if err != nil || (!IsCreate(p.Create) && field == nil) {
+	if err != nil {
+		if errors.Is(err, &InvalidNodeKindError{}) {
+			fmt.Println(err)
+		}
 		return nil, err
 	}
 
+	if !IsCreate(p.Create) && field == nil {
+		return nil, nil
+	}
+
 	if IsCreate(p.Create) && field == nil {
 		var nextPart string
 		if len(p.Path) > 1 {