buildutils: add FindDirUpwards

buildutils/buildutils.go

@@ -120,6 +120,38 @@ func FindFileUpwards(ctx context.Context, filename string) (string, error) {
 	return "", fmt.Errorf("%w: %s", ErrNotFound, filename)
 }
 
+func FindDirUpwards(ctx context.Context, dir string) (string, error) {
+	cwd, err := os.Getwd()
+	if err != nil {
+		return "", fmt.Errorf("failed to get cwd: %w", err)
+	}
+
+	check := func(dir string) bool {
+		base := filepath.Base(cwd)
+		if base == dir {
+			return true
+		}
+		return false
+	}
+	d := cwd
+	for {
+		found := check(d)
+		if found {
+			return d, nil
+		}
+		a, err := filepath.Abs(d)
+		if err != nil {
+			return "", fmt.Errorf("failed to get abs path: %w", err)
+		}
+		if a == "/" {
+			break
+		}
+		d = filepath.Join(d, "../")
+	}
+
+	return "", fmt.Errorf("%w: %s", ErrNotFound, dir)
+}
+
 func Touch(filename string) error {
 	_, err := os.Stat(filename)
 	if os.IsNotExist(err) {