64 lines
1.7 KiB
Markdown
64 lines
1.7 KiB
Markdown
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date = "2012-04-02"
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title = "Showing Ruby, Rails and git info in your app"
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tags = ["Ruby", "Rails", "protip"]
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slug = "showing-ruby-rails-and-git-info-in-your-app"
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+++
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Some people've asked me how I show rendering information on [ariejan.net](http://ariejan.net).
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There are a few things going on here, let me explain them one by one.
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### Rails version
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The current Rails version is probably the easiest you see here. Rails exposes its version information like this:
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Rails.version
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### Ruby version
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Ruby also exposes version information, albeit using constants:
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RUBY_VERSION
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=> "1.9.3"
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You may know that ruby also has different patch levels for each release. You can also retrieve that information:
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RUBY_PATCHLEVEL
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=> 125
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The you may also want to know which engine you're using. This may be "ruby" or something different:
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RUBY_ENGINE
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=> "ruby"
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Combine these to get a sexy ruby version string:
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puts "#{RUBY_ENGINE}-#{RUBY_VERSION}-p#{RUBY_PATCHLEVEL}"
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=> "ruby-1.9.3-p125"
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### Current process ID
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I like to know which Unicorn produced a certain page. Retrieving the process ID is easy:
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Process.pid
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=> 9473
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### Current git revision SHA
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Knowing which version of your app is currently running can be useful information. To do this I created the following initializer:
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# config/initializers/git_revision.rb
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module AppName
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REVISION = `git log --pretty=format:'%h' -n 1`
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end
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This will expose the current short SHA in your application's namespace:
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AppName::REVISION
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=> "ac6d3a0"
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You can now use this info through-out your app to show version information.
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