class Bundler::Source::Git::GitProxy

def checkout
  if path.exist?
    return if has_revision_cached?
    Bundler.ui.confirm "Updating #{uri}"
    in_path do
      git_retry %|fetch --force --quiet --tags #{uri_escaped} "refs/heads/*:refs/heads/*"|
    end
  else
    Bundler.ui.info "Fetching #{uri}"
    FileUtils.mkdir_p(path.dirname)
    git_retry %|clone #{uri_escaped} "#{path}" --bare --no-hardlinks --quiet|
  end
end