Node.js DigitalOcean VPS上的Capistrano检查失败

我正在尝试将Node.js应用程序部署到运行在DigitalOcean上的VPS上，目前为止，我的工作进展顺利。我对*nix的理解非常有限，请耐心听我说：）

我可以使用ssh密钥以root身份ssh到我的VPS（ubuntu13.04 x32）中，没有任何问题。在本地计算机上运行“$cap deploy:setup”时，我得到以下结果：

  * 2013-09-11 12:39:08 executing `deploy:setup'
  * executing "mkdir -p /var/www/yable /var/www/yable/releases /var/www/yable/shared /var/www/yable/shared/system /var/www/yable/shared/log /var/www/yable/shared/pids"
    servers: ["162.243.1.207"]
    [162.243.1.207] executing command
 ** [out :: 162.243.1.207] env: sh: No such file or directory
    command finished in 118ms
failed: "env PATH=/var/www/yable NODE_ENV=production sh -c 'mkdir -p /var/www/yable /var/www/yable/releases /var/www/yable/shared /var/www/yable/shared/system /var/www/yable/shared/log /var/www/yable/shared/pids'" on 162.243.1.207

当我运行“$cap deploy:check”时，我得到以下输出：

* 2013-09-11 12:40:36 executing `deploy:check'
  * executing "test -d /var/www/yable/releases"
    servers: ["162.243.1.207"]
    [162.243.1.207] executing command
    command finished in 67ms
  * executing "test -w /var/www/yable"
    servers: ["162.243.1.207"]
    [162.243.1.207] executing command
    command finished in 76ms
  * executing "test -w /var/www/yable/releases"
    servers: ["162.243.1.207"]
    [162.243.1.207] executing command
    command finished in 69ms
  * executing "which git"
    servers: ["162.243.1.207"]
    [162.243.1.207] executing command
    command finished in 75ms
The following dependencies failed. Please check them and try again:
--> `/var/www/yable/releases' does not exist. Please run `cap deploy:setup'. (162.243.1.207)
--> You do not have permissions to write to `/var/www/yable'. (162.243.1.207)
--> You do not have permissions to write to `/var/www/yable/releases'. (162.243.1.207)
--> `git' could not be found in the path (162.243.1.207)

这是我的config/deploy.rb文件：

set :application, "Yable.com"
set :scm, :git
set :repository, "git@github.com:Yable/yable-node-js.git"
set :user, "root"
set :ssh_options, { :forward_agent => true }
default_run_options[:pty] = true
set :use_sudo, false
set :branch, "master"

role :app, "162.243.1.207"
set :deploy_to, "/var/www/yable"

set :default_environment, {
  'PATH' => "/var/www/yable",
  'NODE_ENV' => 'production'
}

我目瞪口呆，因为上面提到的目录（/var/www/yable/releases）确实存在，而且已经安装了git。有什么想法吗

谢谢，

---

Francis

我安装了ruby 2.0.0和Bundler，它似乎解决了我的部署问题