implements nested kyaml(KEP-5295) structure replacements

Author: koba1t

api/filters/replacement/replacement_test.go

@@ -4944,12 +4944,68 @@ data:
           - name: sidecar
             image: busybox:latest`,
 		},
+		"replacement yaml flow style (kyaml) field": {
+			input: `apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: source-values
+data:
+  app_name: "my-awesome-app"
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: target-config
+data:
+  config.yaml: |-
+    labels: {
+      app: "REPLACE_APP_NAME",
+      version: "1.0.0",
+      env: "production",
+    }
+    spec: {
+      replicas: 3,
+      selector: {
+        matchLabels: {
+          app: "REPLACE_APP_NAME"
+        }
+      }
+    }`,
+			replacements: `replacements:
+- source:
+    kind: ConfigMap
+    name: source-values
+    fieldPath: data.app_name
+  targets:
+  - select:
+      kind: ConfigMap
+      name: target-config
+    fieldPaths:
+    - data.config\.yaml.labels.app
+    - data.config\.yaml.spec.selector.matchLabels.app
+`,
+			expected: `apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: source-values
+data:
+  app_name: "my-awesome-app"
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: target-config
+data:
+  config.yaml: |-
+    labels: {app: "my-awesome-app", version: "1.0.0", env: "production"}
+    spec: {replicas: 3, selector: {matchLabels: {app: "my-awesome-app"}}}`,
+		},
 	}
 
 	for tn := range testCases {
 		t.Run(tn, func(t *testing.T) {
 			// Test one case to see if structured data replacement works
-			if tn == "replacement contain jsonfield" || tn == "replacement yaml field in configmap" {
+			if tn == "replacement contain jsonfield" || tn == "replacement yaml field in configmap" || tn == "replacement yaml flow style (kyaml) field" {
 				f := Filter{}
 				err := yaml.Unmarshal([]byte(testCases[tn].replacements), &f)
 				if !assert.NoError(t, err) {

kyaml/yaml/match_test.go

@@ -423,6 +423,52 @@ data:
 			path:     []string{"data", "config.json", "database", "connections", "primary", "host"},
 			expected: "- \"primary-db.example.com\"\n",
 		},
+		"yaml flow style (kyaml) field access": {
+			input: `apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: test-config
+data:
+  config.yaml: |-
+    labels: {
+      app: "foobar",
+      foo: "bar",
+      something: "12345",
+    }
+    spec: {
+      replicas: 3,
+      selector: {
+        matchLabels: {
+          app: "foobar"
+        }
+      }
+    }`,
+			path:     []string{"data", "config.yaml", "labels", "app"},
+			expected: "- \"foobar\"\n",
+		},
+		"yaml flow style nested field access": {
+			input: `apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: test-config
+data:
+  config.yaml: |-
+    labels: {
+      app: "foobar",
+      foo: "bar",
+      something: "12345",
+    }
+    spec: {
+      replicas: 3,
+      selector: {
+        matchLabels: {
+          app: "foobar"
+        }
+      }
+    }`,
+			path:     []string{"data", "config.yaml", "spec", "selector", "matchLabels", "app"},
+			expected: "- \"foobar\"\n",
+		},
 		"invalid json returns field value as-is": {
 			input: `apiVersion: v1
 kind: ConfigMap