确实使用``:platforms =>''在您的gemfile中工作? [英] does using ":platforms =>" in your gemfile work?

问题描述

我有一个正在Windows上开发并部署到Linux的Rails应用程序.我怀疑将来我会完全切换到Linux.无论如何，在Linux上，我需要'execjs'和'therubyracer'，但在Win7中则不需要.所以我将这些行放在我的gemfile中:

I have a Rails app that I'm developing on Windows and deploying to Linux. I suspect I'll just switch entirely over to Linux in the future. Anyway, on Linux I need 'execjs' and 'therubyracer' but I don't need those in Win7. So I put these lines in my gemfile:

gem 'therubyracer', :platforms => :ruby
gem 'execjs', :platforms => :ruby

在Linux VM上运行bundle install，应用启动正常.但是在Windows上，我得到:

Ran a bundle install on the Linux VM and the app started up fine. But on Windows I get:

Uncaught exception: Could not find execjs-1.2.11 in any of the sources

现在，根据我所读的内容(在PLATFORMS下的此处)，它告诉我如果gem仅应在特定平台或平台组中使用，则可以指定它们"，示例如下:

Now, from what I read (here under PLATFORMS) it tells me that "If a gem should only be used in a particular platform or set of platforms, you can specify them" and the sample is this:

gem "weakling",   :platforms => :jruby 

它说"ruby C Ruby (MRI) or Rubinius, but NOT Windows".所以对我来说，捆绑软件应该忽略Windows上的execjs行.但是在Windows上，当我运行bundle install时，我看到了:

And it says "ruby C Ruby (MRI) or Rubinius, but NOT Windows". So to me that says that bundler should be ignoring the execjs line on Windows. However on Windows when I ran bundle install I saw this:

Installing execjs (1.2.11)

所以对我来说，我缺少有关文档或捆绑程序的信息，而忽略了platforms命令.难道我做错了什么?

So that says to me I'm missing something about the docs or bundler is ignoring the platforms command. Am I doing something wrong?

PS>bundle -v
Bundler version 1.0.21

推荐答案

:platforms => :ruby确实排除了Windows上无法安装gems的情况.

:platforms => :ruby does indeed exclude gems from being installed on Windows.

但是，它在 cygwin 环境中不起作用.在cygwin中，它认为平台是:mri.

However, it does not work in a cygwin environment. In cygwin, it considers the platform to be :mri.

您还会注意到，ruby -e 'puts RUBY_PLATFORM'输出i386-cygwin，而不是像Windows ruby​​那样输出i386-mingw32或i386-mswin.

You'll also notice that ruby -e 'puts RUBY_PLATFORM' outputs i386-cygwin, not i386-mingw32 or i386-mswin like it would on Windows ruby.

您是否在Cygwin环境中工作?

Were you working in a cygwin environment?

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