Gem::BundlerVersionFinder.lockfile_contents

# File tmp/rubies/ruby-4.0.0/lib/rubygems/bundler_version_finder.rb, line 51
def self.lockfile_contents
  gemfile = ENV["BUNDLE_GEMFILE"]
  gemfile = nil if gemfile&.empty?

  unless gemfile
    begin
      Gem::Util.traverse_parents(Dir.pwd) do |directory|
        next unless gemfile = Gem::GEM_DEP_FILES.find {|f| File.file?(f) }

        gemfile = File.join directory, gemfile
        break
      end
    rescue Errno::ENOENT
      return
    end
  end

  return unless gemfile

  lockfile = ENV["BUNDLE_LOCKFILE"]
  lockfile = nil if lockfile&.empty?

  lockfile ||= case gemfile
               when "gems.rb" then "gems.locked"
               else "#{gemfile}.lock"
  end

  return unless File.file?(lockfile)

  File.read(lockfile)
end