在不同的类中定义的相同资源的重复声明 [英] Duplicate declaration of same resource defined in separate classes

问题描述

我有一个需要 build-essential 包的类定义:

I have a class definition which requires the build-essential package:

class erlang($version = '17.3') {

  package { "build-essential": 
    ensure => installed
  }
  ...
}

不同模块中的另一个类也需要 build-essential 包:

Another class in a different module also requires the build-essential package:

class icu {

  package { "build-essential": 
    ensure => installed
  }
  ...
}

但是，当我尝试执行 puppet apply 时，我收到的错误是:

However, when I try to perform puppet apply, the error I receive is:

Error: Duplicate declaration: Package[build-essential] is already declared in file /vagrant/modules/erlang/manifests/init.pp:18; cannot redeclare at /vagrant/modules/libicu/manifests/init.pp:17 on node vagrant-ubuntu-trusty-64.home

我期待类封装它们使用的资源，但似乎并非如此?我该如何解决这个冲突?

I was expecting classes to encapsulate the resources they use but this doesn't seem to be the case? How can I resolve this clash?

推荐答案

这是处理多个模块时的常见问题.

This is common question when dealing with multiple modules.

有多种方法可以做到这一点，最佳实践是模块化并允许安装必要的构建作为参数:

There's a number of ways of doing this, the best practise is to modularise and allow the installation of build essential as a parameter:

class icu ($manage_buildessential = false){

  if ($manage_buildessential == true) {
   package { "build-essential": 
     ensure => installed
   }
 }
}

然后，您想在何处加入 ICU 课程:

Then, where you want to include your ICU class:

class {'icu':
   manage_buildessential => 'false',
}

但是，为了快速而肮脏的修复:

However, for a quick and dirty fix:

if ! defined(Package['build-essential']) {
    package { 'build-essential': ensure => installed }
}

或者如果你有 puppetlabs-stdlib 模块:

Or if you have puppetlabs-stdlib module:

ensure_packages('build-essential')

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