# File lib/bundler/cli.rb, line 164
    def install
      opts = options.dup
      if opts[:without]
        opts[:without].map!{|g| g.split(" ") }
        opts[:without].flatten!
        opts[:without].map!{|g| g.to_sym }
      end

      # Can't use Bundler.settings for this because settings needs gemfile.dirname
      ENV['BUNDLE_GEMFILE'] = File.expand_path(opts[:gemfile]) if opts[:gemfile]
      ENV['RB_USER_INSTALL'] = '1' if Bundler::FREEBSD

      # Just disable color in deployment mode
      Bundler.ui.shell = Thor::Shell::Basic.new if opts[:deployment]

      if (opts[:path] || opts[:deployment]) && opts[:system]
        Bundler.ui.error "You have specified both a path to install your gems to, \n" \
                         "as well as --system. Please choose."
        exit 1
      end

      if opts[:deployment] || opts[:frozen]
        unless Bundler.default_lockfile.exist?
          flag = opts[:deployment] ? '--deployment' : '--frozen'
          raise ProductionError, "The #{flag} flag requires a Gemfile.lock. Please make " \
                                 "sure you have checked your Gemfile.lock into version control " \
                                 "before deploying."
        end

        if Bundler.root.join("vendor/cache").exist?
          opts[:local] = true
        end

        Bundler.settings[:frozen] = '1'
      end

      # When install is called with --no-deployment, disable deployment mode
      if opts[:deployment] == false
        Bundler.settings.delete(:frozen)
        opts[:system] = true
      end

      # Can't use Bundler.settings for this because settings needs gemfile.dirname
      Bundler.settings[:path]   = nil if opts[:system]
      Bundler.settings[:path]   = "vendor/bundle" if opts[:deployment]
      Bundler.settings[:path]   = opts[:path] if opts[:path]
      Bundler.settings[:path] ||= "bundle" if opts[:standalone]
      Bundler.settings[:bin]    = opts["binstubs"] if opts[:binstubs]
      Bundler.settings[:shebang] = opts["shebang"] if opts[:shebang]
      Bundler.settings[:no_prune] = true if opts["no-prune"]
      Bundler.settings[:disable_shared_gems] = Bundler.settings[:path] ? '1' : nil
      Bundler.settings.without = opts[:without]
      Bundler.ui.be_quiet! if opts[:quiet]
      Bundler.settings[:clean] = opts[:clean] if opts[:clean]

      Bundler::Fetcher.disable_endpoint = opts["full-index"]
      # rubygems plugins sometimes hook into the gem install process
      Gem.load_env_plugins if Gem.respond_to?(:load_env_plugins)

      Installer.install(Bundler.root, Bundler.definition, opts)
      Bundler.load.cache if Bundler.root.join("vendor/cache").exist? && !options["no-cache"]

      if Bundler.settings[:path]
        absolute_path = File.expand_path(Bundler.settings[:path])
        relative_path = absolute_path.sub(File.expand_path('.'), '.')
        Bundler.ui.confirm "Your bundle is complete! " +
          "It was installed into #{relative_path}"
      else
        Bundler.ui.confirm "Your bundle is complete! " +
          "Use `bundle show [gemname]` to see where a bundled gem is installed."
      end
      Installer.post_install_messages.to_a.each do |name, msg|
        Bundler.ui.confirm "Post-install message from #{name}:\n#{msg}"
      end

      clean if Bundler.settings[:clean] && Bundler.settings[:path]
    rescue GemNotFound => e
      if opts[:local] && Bundler.app_cache.exist?
        Bundler.ui.warn "Some gems seem to be missing from your vendor/cache directory."
      end

      if Bundler.definition.no_sources?
        Bundler.ui.warn "Your Gemfile has no remote sources. If you need " \
          "gems that are not already on\nyour machine, add a line like this " \
          "to your Gemfile:\n    source 'https://rubygems.org'"
      end
      raise e
    end