Templating function fromYaml (run-int-tests) (#1271)

pkg/landscaper/installations/executions/template/gotemplate/funcs.go

@@ -65,7 +65,8 @@ func LandscaperTplFuncMap(blueprint *blueprints.Blueprint,
 		"readFile": readFileFunc(blueprint.Fs),
 		"readDir":  readDir(blueprint.Fs),
 
-		"toYaml": toYAML,
+		"toYaml":   toYAML,
+		"fromYaml": fromYAML,
 
 		"parseOCIRef":   lstmpl.ParseOCIReference,
 		"ociRefRepo":    getOCIReferenceRepository,
@@ -125,6 +126,13 @@ func toYAML(v interface{}) string {
 	return strings.TrimSuffix(string(data), "\n")
 }
 
+// fromYAML takes a string, unmarshals it from yaml, and returns an interface.
+func fromYAML(input string) (any, error) {
+	var output any
+	err := yaml.Unmarshal([]byte(input), &output)
+	return output, err
+}
+
 // getOCIReferenceVersion returns the version of a oci reference
 func getOCIReferenceVersion(ref string) string {
 	return lstmpl.ParseOCIReference(ref)[1]

pkg/landscaper/installations/executions/template/gotemplate/gotemplate_test.go

@@ -67,4 +67,18 @@ var _ = Describe("TemplateDeployExecutions", func() {
 		Expect(res).To(BeEquivalentTo("config:\n  value: foo\n  const: bar"))
 	})
 
+	It("should render a go template with a fromYaml function", func() {
+		bp := blueprints.New(nil, memoryfs.New())
+		tmpl := `{{ $yamlData := fromYaml .values.yamlString }}{{ $yamlData.foo }}`
+		t, err := gotemplate.NewTemplateExecution(bp, nil, nil, nil)
+		Expect(err).ToNot(HaveOccurred())
+		values := map[string]interface{}{
+			"values": map[string]interface{}{
+				"yamlString": `foo: bar`,
+			},
+		}
+		res, err := t.Execute(tmpl, values)
+		Expect(err).ToNot(HaveOccurred())
+		Expect(string(res)).To(Equal("bar"))
+	})
 })