checkout

# File lib/bundler/source/git/git_proxy.rb, line 93
        def checkout
          return if path.exist? && has_revision_cached?
          extra_ref = "#{Shellwords.shellescape(ref)}:#{Shellwords.shellescape(ref)}" if ref && ref.start_with?("refs/")

          Bundler.ui.info "Fetching #{URICredentialsFilter.credential_filtered_uri(uri)}"

          unless path.exist?
            SharedHelpers.filesystem_access(path.dirname) do |p|
              FileUtils.mkdir_p(p)
            end
            git_retry %(clone #{uri_escaped_with_configured_credentials} "#{path}" --bare --no-hardlinks --quiet)
            return unless extra_ref
          end

          in_path do
            git_retry %(fetch --force --quiet --tags #{uri_escaped_with_configured_credentials} "refs/heads/*:refs/heads/*" #{extra_ref})
          end
        end