从 Rake 获取 Ruby 环境变量
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Getting Ruby environment variables from Rake
提问by Sergio Tulentsev
I have a Rakefile which has tasks for deploying or building an application. This Rakefile is used in both production and development.
我有一个 Rakefile，它有部署或构建应用程序的任务。这个 Rakefile 用于生产和开发。
I would like the buildtask to know what the environment is. Can this be done without passing a parameter to the task when I run it? Can it be done with environment variables?
我希望build任务知道环境是什么。当我运行它时，可以在不将参数传递给任务的情况下完成吗？可以用环境变量来完成吗？
When in development, I need the task to look like this:
在开发过程中，我需要任务如下所示：
task :build => :clean do
compass compile -e development
jekyll
end
And in production, like this:
在生产中，像这样：
task :build => :clean do
compass compile -e production
jekyll
end
回答by Sergio Tulentsev
Yes, you can use environment variables. Here's skeleton implementation:
是的，您可以使用环境变量。这是骨架实现：
task :build do |t, args|
puts "Current env is #{ENV['RAKE_ENV']}"
end
Usage:
用法：
% rake build
Current env is
% RAKE_ENV=development rake build
Current env is development
