Fail message is now the same as the required message.

Fixed #8973 Helm function 'fail' should not fail when doing 'helm lint'

Signed-off-by: Marcus Speight <marcus.speight@hotmail.co.uk>
(cherry picked from commit 7a0739a863)

pkg/engine/engine.go

@@ -173,6 +173,16 @@ func (e Engine) initFunMap(t *template.Template, referenceTpls map[string]render
 		return val, nil
 	}
 
+	// Override sprig fail function for linting and wrapping message
+	funcMap["fail"] = func(msg string) (string, error) {
+		if e.LintMode {
+			// Don't fail when linting
+			log.Printf("[INFO] Fail: %s", msg)
+			return "", nil
+		}
+		return "", errors.New(warnWrap(msg))
+	}
+
 	// If we are not linting and have a cluster connection, provide a Kubernetes-backed
 	// implementation.
 	if !e.LintMode && e.config != nil {

pkg/engine/engine_test.go

@@ -286,6 +286,23 @@ func TestExecErrors(t *testing.T) {
 	}
 }
 
+func TestFailErrors(t *testing.T) {
+	vals := chartutil.Values{"Values": map[string]interface{}{}}
+
+	failtpl := `{{ fail "This is an error" }}`
+	tplsFailed := map[string]renderable{
+		"failtpl": {tpl: failtpl, vals: vals},
+	}
+	_, err := new(Engine).render(tplsFailed)
+	if err == nil {
+		t.Fatalf("Expected failures while rendering: %s", err)
+	}
+	expected := `execution error at (failtpl:1:3): This is an error`
+	if err.Error() != expected {
+		t.Errorf("Expected '%s', got %q", expected, err.Error())
+	}
+}
+
 func TestAllTemplates(t *testing.T) {
 	ch1 := &chart.Chart{
 		Metadata: &chart.Metadata{Name: "ch1"},