// readFile reads a file and returns the contents.
func readFile(path string) (string, error) {
	b, err := os.ReadFile(path)
	return string(b), err
}

// writeFile writes a file and returns an error if operation is unsuccessful.
func writeFile(path string, data []byte) error {
	return os.WriteFile(path, data, 0o644)
}

// inFileAbsolutePath returns the absolute path for an input file like "gateways".