docs: def update_ca_bundle(target=None, source=None, merge_files=None):
      '''
      Update the local CA bundle file from a URL
  
      .. versionadded:: 2015.5.0
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' http.update_ca_bundle
          salt '*' http.update_ca_bundle target=/path/to/cacerts.pem
          salt '*' http.update_ca_bundle source=https://example.com/cacerts.pem
  
      If the ``target`` is not specified, it will be pulled from the ``ca_cert``
      configuration variable available to the minion. If it cannot be found there,
      it will be placed at ``<<FILE_ROOTS>>/cacerts.pem``.
  
      If the ``source`` is not specified, it will be pulled from the
      ``ca_cert_url`` configuration variable available to the minion. If it cannot
      be found, it will be downloaded from the cURL website, using an http (not
      https) URL. USING THE DEFAULT URL SHOULD BE AVOIDED!
  
      ``merge_files`` may also be specified, which includes a string or list of
      strings representing a file or files to be appended to the end of the CA
      bundle, once it is downloaded.
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' http.update_ca_bundle merge_files=/path/to/mycert.pem
      '''
      if target is None:
          target = __salt__['config.get']('ca_bundle', None)
  
      if source is None:
          source = __salt__['config.get']('ca_bundle_url', None)
  
      return salt.utils.http.update_ca_bundle(
          target, source, __opts__, merge_files
      )