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使用 docker -v 选项，我们可以指定写访问权限，如下所示

docker run -d --name web -v /etc/localtime:/etc/localtime:ro

其中ro意味着只读访问。

我们如何用无花果做到这一点？如果

pg:
  image: xxxxxxxxxxxxxx/postgres:9.1-1
web:
  image: xxxxxxxxxxxxxx/unicorn:0.0.2
  volumes:
    - /etc/localtime:/etc/localtime:ro
    - .:/src
  links:
    - pg:server_pg
  command: /bin/bash -xe something.sh

在上面的示例中：卷部分中的ro引发以下错误

Traceback (most recent call last):
  File "<string>", line 3, in <module>
  File "/code/build/fig/out00-PYZ.pyz/fig.cli.main", line 39, in main
  File "/code/build/fig/out00-PYZ.pyz/fig.cli.docopt_command", line 21, in sys_dispatch
  File "/code/build/fig/out00-PYZ.pyz/fig.cli.command", line 31, in dispatch
  File "/code/build/fig/out00-PYZ.pyz/fig.cli.docopt_command", line 24, in dispatch
  File "/code/build/fig/out00-PYZ.pyz/fig.cli.command", line 50, in perform_command
  File "/code/build/fig/out00-PYZ.pyz/fig.cli.docopt_command", line 27, in perform_command
  File "/code/build/fig/out00-PYZ.pyz/fig.cli.main", line 306, in up
  File "/code/build/fig/out00-PYZ.pyz/fig.project", line 131, in up
  File "/code/build/fig/out00-PYZ.pyz/fig.service", line 173, in recreate_containers
  File "/code/build/fig/out00-PYZ.pyz/fig.service", line 195, in recreate_container
  File "/code/build/fig/out00-PYZ.pyz/fig.service", line 225, in start_container
ValueError: too many values to unpack
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