在Travis build上安装更高版本的docker-engine

Question

因为我需要一个新版本的docker-compose，所以我还需要一个新版本的docker-engine。我试过了：

before_install:
  - sudo apt-get install -qq docker-engine

但是，在出现提示时，构建会停滞不前：

Configuration file '/etc/default/docker'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** docker (Y/I/N/O/D/Z) [default=N] ? 

我如何让它保留旧版本而不阻塞？(或者我应该接受新版本？我猜Travis CI正在对它做一些事情...)

我首先尝试了sudo apt-get remove -qq docker-engine，它似乎没有任何作用。

Answer 1

确保您使用正确的Travis CI环境，即Trusty beta environment。

然后查看updating your Docker Compose here的Travis文档。