Add helper for parsing to YAML

Author: versilis

cmd/internal/kube/injector/helper.go

@@ -0,0 +1,28 @@
+package injector
+
+import (
+	"bytes"
+	v1 "k8s.io/api/core/v1"
+	kyaml "sigs.k8s.io/yaml"
+)
+
+// Calls the given injector's Inject method and returns the result as a YAML bytes.
+func ToRawYAML(injector Injector, sidecar v1.Container) ([]byte, error) {
+	injectedObjects, err := injector.Inject(sidecar)
+	if err != nil {
+		return nil, err
+	}
+
+	out := new(bytes.Buffer)
+	for _, obj := range injectedObjects {
+		raw, err := kyaml.Marshal(obj)
+		if err != nil {
+			return nil, err
+		}
+
+		out.WriteString("---\n")
+		out.Write(raw)
+	}
+
+	return out.Bytes(), nil
+}