code: def detect_config_path():
      
      try:
          proc = subprocess.Popen(['nginx', '-V'], stderr=subprocess.PIPE)
      except OSError:
          error_exit('Access log file or format was not set and nginx config file cannot be detected. ' +
                     'Perhaps nginx is not in your PATH?')
  
      stdout, stderr = proc.communicate()
      version_output = stderr.decode('utf-8')
      conf_path_match = re.search(r'--conf-path=(\S*)', version_output)
      if conf_path_match is not None:
          return conf_path_match.group(1)
  
      prefix_match = re.search(r'--prefix=(\S*)', version_output)
      if prefix_match is not None:
          return prefix_match.group(1) + '/conf/nginx.conf'
      return '/etc/nginx/nginx.conf'
docs: Get nginx configuration file path based on `nginx -V` output
      :return: detected nginx configuration file path