set_api_key

# File lib/rubygems/config_file.rb, line 318
  def set_api_key(host, api_key)
    check_credentials_permissions

    config = load_file(credentials_path).merge(host => api_key)

    dirname = File.dirname credentials_path
    Dir.mkdir(dirname) unless File.exist? dirname

    Gem.load_yaml

    permissions = 0600 & (~File.umask)
    File.open(credentials_path, 'w', permissions) do |f|
      f.write config.to_yaml
    end

    load_api_keys # reload
  end