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Gems from git repositories

Bundler adds the ability to use gems directly from git repositories. Setting them up is as easy as adding a gem to your Gemfile. Using the very latest version of a gem (or even a fork) is just as easy as using an official release.
Because RubyGems lacks the ability to handle gems from git, any gems installed from a git repository will not show up in gem list. They will, however, be available after running Bundler.setup.
Specify that a gem should come from a git repository with a .gemspec at its root
gem "nokogiri", :git => ""

If there is no .gemspec at the root of a git repository, you must specify a version that bundler should use when resolving dependencies
gem "deep_merge", "1.0", :git => ""

Specify that a git repository containing multiple .gemspec files should be treated as a gem source
git "" do
  gem "railties"
  gem "action_pack"
  gem "active_model"

Specify that a git repository should use a particular ref, branch, or tag
:git => "", :ref => "4aded"
:git => "", :branch => "2-3-stable"
:git => "", :tag => "v2.3.5"

Specifying a ref, branch, or tag for a git repository specified inline works exactly the same way
gem "nokogiri", :git => "", :ref => "0eec4"

Bundler can use HTTP(S), SSH, or git
gem 'nokogiri', :git => ''
gem 'nokogiri', :git => ''
gem 'nokogiri', :git => 'git://'


http:// and git:// URLs are insecure, and should be avoided if at all possible. These protocols are unauthenticated, so a man-in-the-middle attacker can tamper with the code and compromise your system.