code: def custom_repo(distro, args, cd_conf, rlogger, install_ceph=None):
      
      default_repo = cd_conf.get_default_repo()
      components = detect_components(args, distro)
      if args.release in cd_conf.get_repos():
          LOG.info('will use repository from conf: %s' % args.release)
          default_repo = args.release
      elif default_repo:
          LOG.info('will use default repository: %s' % default_repo)
  
      # At this point we know there is a cd_conf and that it has custom
      # repos make sure we were able to detect and actual repo
      if not default_repo:
          LOG.warning('a ceph-deploy config was found with repos \
              but could not default to one')
      else:
          options = dict(cd_conf.items(default_repo))
          options['install_ceph'] = False if install_ceph is False else True
          extra_repos = cd_conf.get_list(default_repo, 'extra-repos')
          rlogger.info('adding custom repository file')
          try:
              distro.repo_install(
                  distro,
                  default_repo,
                  options.pop('baseurl'),
                  options.pop('gpgkey'),
                  components=components,
                  **options
              )
          except KeyError as err:
              raise RuntimeError('missing required key: %s in config section: %s' % (err, default_repo))
  
          for xrepo in extra_repos:
              rlogger.info('adding extra repo file: %s.repo' % xrepo)
              options = dict(cd_conf.items(xrepo))
              try:
                  distro.repo_install(
                      distro,
                      xrepo,
                      options.pop('baseurl'),
                      options.pop('gpgkey'),
                      components=components,
                      **options
                  )
              except KeyError as err:
                  raise RuntimeError('missing required key: %s in config section: %s' % (err, xrepo))
docs: A custom repo install helper that will go through config checks to retrieve
      repos (and any extra repos defined) and install those
  
      ``cd_conf`` is the object built from argparse that holds the flags and
      information needed to determine what metadata from the configuration to be
      used.