code: def env():
      
  
      if cij.ssh.env():
          cij.err("cij.pci.env: invalid SSH environment")
          return 1
  
      pci = cij.env_to_dict(PREFIX, REQUIRED)
  
      pci["BUS_PATH"] = "/sys/bus/pci"
      pci["DEV_PATH"] = os.sep.join([pci["BUS_PATH"], "devices", pci["DEV_NAME"]])
  
      cij.env_export(PREFIX, EXPORTED, pci)
  
      return 0
docs: Verify PCI variables and construct exported variables