初始化时检查文件夹是否存在,否则创建?

当我们要第一次运行vagrant时,如何检查项目目录中是否存在同步文件夹,如果不存在,则创建后再进行其余的进程?

我尝试使用:

  config.trigger.before [:up] do |trigger|
    trigger.info = "Create log, tmp, webroot/img folders"
    trigger.run = {path: ".provisioning/before_up.sh"}
  end

#!/bin/bash
# before_up.sh

if [ ! -d "logs" ]; then
  sudo mkdir logs
fi

if [ ! -d "tmp" ]; then
  sudo mkdir tmp
fi

if [ ! -d "webroot/img" ]; then
  sudo mkdir webroot/img
fi

但是有错误

==> default: Running triggers before up ...
==> default: Running trigger...
==> default: Create logs, tmp, webroot/img folders
    default: Running local script: .provisioning/before_up.sh
==> default: Trigger run failed
==> default: Permission denied - /Users/me/apps/.provisioning/before_up.sh