-- | Get nodes of a given node group.
getGroupNodes :: ConfigData -> String -> [Node]
getGroupNodes cfg gname =
  let all_nodes = M.elems . fromContainer . configNodes $ cfg in
  filter ((==gname) . nodeGroup) all_nodes
getGroupNodes :: ConfigData -> String -> [Node]
getGroupNodes cfg gname =
  let all_nodes = M.elems . fromContainer . configNodes $ cfg in
  filter ((==gname) . nodeGroup) all_nodes
getGroupNodes cfg gname =
  let all_nodes = M.elems . fromContainer . configNodes $ cfg in
  filter ((==gname) . nodeGroup) all_nodes