code: def env():
      
  
      if cij.ssh.env():
          cij.err("board.env: invalid SSH environment")
          return 1
  
      board = cij.env_to_dict(PREFIX, REQUIRED)   # Verify REQUIRED variables
      if board is None:
          cij.err("board.env: invalid BOARD environment")
          return 1
  
      board["CLASS"] = "_".join([board[r] for r in REQUIRED[:-1]])
      board["IDENT"] = "-".join([board["CLASS"], board["ALIAS"]])
  
      cij.env_export(PREFIX, EXPORTED, board)     # Export EXPORTED variables
  
      return 0
docs: Verify BOARD variables and construct exported variables