使用“:platforms =>"在你的 gemfile 工作中? [英] does using ":platforms =>" in your gemfile work?
问题描述
我有一个在 Windows 上开发并部署到 Linux 的 Rails 应用程序.我怀疑我将来会完全切换到 Linux.无论如何，在 Linux 上我需要 'execjs' 和 'therubyracer' 但在 Win7 中我不需要它们.所以我把这些行放在我的 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，应用程序启动正常.但在 Windows 上我得到:
Ran a bundle install on the Linux VM and the app started up fine. But on Windows I get:
未捕获的异常:在任何源中都找不到 execjs-1.2.11
现在，根据我阅读的内容(here 在 PLATFORMS 下)，它告诉我如果一个 gem 应该只在一个特定的平台或一组平台中使用，你可以指定它们"，示例是这样的:
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
上面写着ruby C Ruby (MRI) 或 Rubinius，但不是 Windows".所以对我来说，bundler 应该忽略 Windows 上的 execjs 行.但是在 Windows 上，当我运行 bundle install 时，我看到了这个:
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)
这对我来说意味着我缺少有关文档或捆绑程序的某些内容，而忽略了平台命令.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 确实排除了在 Windows 上安装 gems.
:platforms => :ruby does indeed exclude gems from being installed on Windows.
但是，它不在 cygwin 环境中工作.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 i386-mingw32 或 i386-mswin 就像在 Windows ruby 上一样.
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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