Ensure that not-exist and pattern error return different results

staging/src/k8s.io/cli-runtime/pkg/resource/builder.go

@@ -259,7 +259,7 @@ func (b *Builder) FilenameParam(enforceNamespace bool, filenameOptions *Filename
 		default:
 			matches, err := expandIfFilePattern(s)
 			if err != nil {
-				b.errs = append(b.errs, fmt.Errorf("pattern %q is not valid: %v", s, err))
+				b.errs = append(b.errs, err)
 				continue
 			}
 			if !recursive && len(matches) == 1 {
@@ -1213,11 +1213,12 @@ func expandIfFilePattern(pattern string) ([]string, error) {
 	if _, err := os.Stat(pattern); os.IsNotExist(err) {
 		matches, err := filepath.Glob(pattern)
 		if err == nil && len(matches) == 0 {
-			return nil, fmt.Errorf("no match")
+			return nil, fmt.Errorf("the path %q does not exist", pattern)
 		}
-		if err == nil || err != filepath.ErrBadPattern {
-			return matches, err
+		if err == filepath.ErrBadPattern {
+			return nil, fmt.Errorf("pattern %q is not valid: %v", pattern, err)
 		}
+		return matches, err
 	}
 	return []string{pattern}, nil
 }

staging/src/k8s.io/cli-runtime/pkg/resource/builder_test.go

@@ -638,7 +638,7 @@ func TestFilePatternBuilderWhenPatternYieldsNoResult(t *testing.T) {
 	if err == nil {
 		t.Fatalf("unexpected response: error is nil")
 	}
-	const expectedErrorMsg = "no match"
+	const expectedErrorMsg = "does not exist"
 	if !strings.Contains(err.Error(), expectedErrorMsg) {
 		t.Fatalf("expected %s but got %s", expectedErrorMsg, err.Error())
 	}
@@ -678,7 +678,7 @@ func TestFilePatternBuilderWhenBadPatternUsesRawInput(t *testing.T) {
 	if err == nil {
 		t.Fatalf("unexpected response: error is nil")
 	}
-	const expectedErrorMsg = "does not exist"
+	const expectedErrorMsg = "syntax error in pattern"
 	if !strings.Contains(err.Error(), expectedErrorMsg) {
 		t.Fatalf("expected %s but got %s", expectedErrorMsg, err.Error())
 	}
@@ -707,6 +707,37 @@ func TestFilePatternBuilder(t *testing.T) {
 	}
 }
 
+func TestErrorFilePatternBuilder(t *testing.T) {
+	testCases := map[string]struct {
+		input       []string
+		expectedErr string
+	}{
+		"invalid pattern": {
+			input:       []string{"[a-z*.yaml"},
+			expectedErr: "syntax error in pattern",
+		},
+		"file does not exist": {
+			input:       []string{"../../artifacts/guestbook/notexist.yaml"},
+			expectedErr: "does not exist",
+		},
+	}
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			b := newDefaultBuilder().
+				FilenameParam(false, &FilenameOptions{Recursive: false, Filenames: tc.input}).
+				NamespaceParam("test").DefaultNamespace()
+
+			test := &testVisitor{}
+			singleItemImplied := false
+
+			err := b.Do().IntoSingleItemImplied(&singleItemImplied).Visit(test.Handle)
+			if err == nil || len(test.Infos) != 0 || !strings.Contains(err.Error(), tc.expectedErr) {
+				t.Fatalf("unexpected response: %v %#v", err, test.Infos)
+			}
+		})
+	}
+}
+
 func setupKustomizeDirectory() (string, error) {
 	path, err := ioutil.TempDir("/tmp", "")
 	if err != nil {