打包Docker容器时，打包器shellconfiguration会挂起

我正在尝试构build和configuration一个Docker容器，但是当我运行它时，它会在运行configuration脚本时挂起。

我在OSX上运行使用：

Boot2Docker-cli version: v1.3.1 Packer v0.7.2 **docker version** Client version: 1.3.1 Client API version: 1.15 Server version: 1.3.1 Server API version: 1.15 

运行这个：

 packer build ./packer-build-templates/docker/testsite/testsite.json 

封隔器生成的模板/泊坞窗/testing网站/ testsite.json

  { "builders": [ { "type": "docker", "image": "centos:centos6", "commit": "true" } ], "provisioners": [ { "type": "shell", "script": "script.sh" } ], "post-processors": [ [ { "type": "docker-tag", "repository": "test/stuff", "tag": "latest" } ] ] } 

script.sh

 #!/bin/sh -x echo foo 

输出：

 ==> docker: Creating a temporary directory for sharing data... ==> docker: Pulling Docker image: centos:centos6 docker: centos:centos6: The image you are pulling has been verified docker: Status: Image is up to date for centos:centos6 ==> docker: Starting docker container... docker: Run command: docker run -v /var/folders/z2/nm_4_yyx2ss9z8wn4h0bfd1jw_pj8j/T/packer-docker208208953:/packer-files -d -i -t centos:centos6 /bin/bash docker: Container ID: 3ab21c7c21bc4af84e0f0c7bdbac91ee600d1ea0a469bfa51a959faba73fa7e4 ==> docker: Provisioning with shell script: script.sh 

这是尽可能的。 然后它只是坐在那里。 任何想法发生了什么？