如何编写扩展现有提供程序的Chef提供程序？ [英] How can I write a Chef provider that extends an existing provider?

问题描述

菜谱A在菜谱B中提供了一个我想用LWRP或HWRP扩展的LWRP，因此我可以执行以下操作，其中 provider_b 将使用 provider_a 中的现有代码/资源，并接受可以用于自身操作的其他属性：

Cookbook A provides a LWRP that I would like to extend with a LWRP or HWRP in cookbook B, so that I could do something like the following, where provider_b would use the existing code/resources in provider_a and accept additional attributes it could use for it's own actions:

provider_a "A" do
    attr_from_a :value
end

provider_b "B" do
    attr_from_a :value
    attr_from_b :value
end

这是否可能，而且如果我想避免编辑菜谱还是可能的A？

Is this possible, and is it still possible if I want to avoid editing cookbook A?

推荐答案

听起来您正在尝试创建现有LWRP的子资源，所以您不是包装它-您正在扩展它。 LWRP语法使此操作不尽如人意，因为在运行时会将资源动态编译为Ruby类。

It sounds like you're trying to create a sub-resource of an existing LWRP, so you're not "wrapping" it - you're "extending it". The LWRP syntax makes this less than desirable, because the resources are dynamically compiled into Ruby classes at runtime.

您可以切换到HWRP（新的 Jenkins食谱是一个很好的示例，它使用继承和OO来扩展资源和共享属性。从本质上讲，LWRP并不是很可扩展，因为它们在运行时会动态重建和重新加载。

You could switch to HWRPs (the new Jenkins cookbook is a good example that uses inheritance and OO to extend resources and share attributes). By their nature, LWRPs are not very extensible, since they are dynamically rebuilt and reloaded at runtime.

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