up2date --showall
Traceback (most recent call last):
  File "/usr/sbin/up2date", line 1245, in ?
    sys.exit(main() or 0)
  File "/usr/sbin/up2date", line 617, in main
    printList(rhnPackageInfo.getAvailableAllArchPackageList(), cfg['showChannels'])
  File "/usr/share/rhn/up2date_client/rhnPackageInfo.py", line 315, in getAvailableAllArchPackageList
    package_list = availablePackageList(
  File "/usr/share/rhn/up2date_client/rhnPackageInfo.py", line 130, in availablePackageList
    svrChannels = rhnChannel.getChannels()
  File "/usr/share/rhn/up2date_client/rhnChannel.py", line 180, in getChannels
    raise up2dateErrors.NoChannelsError(_("This system may not be updated until it is associated with a channel."))
up2date_client.up2dateErrors.NoChannelsError: This system may not be updated until it is associated with a channel.