code: def env():
      
  
      if cij.ssh.env():
          cij.err("cij.block.env: invalid SSH environment")
          return 1
  
      block = cij.env_to_dict(PREFIX, REQUIRED)
  
      block["DEV_PATH"] = "/dev/%s" % block["DEV_NAME"]
  
      cij.env_export(PREFIX, EXPORTED, block)
  
      return 0
docs: Verify BLOCK variables and construct exported variables