package netboot

import (
	"log"

	"github.com/jsimonetti/rtnetlink"
)

// getOperState returns the operational state for the given interface index.
func getOperState(iface int) (rtnetlink.OperationalState, error) {
	conn, err := rtnetlink.Dial(nil)
	if err != nil {
		return 0, err
	}
	defer func() {
		err := conn.Close()
		if err != nil {
			log.Printf("failed to close rtnetlink connection: %v", err)
		}
	}()

	msg, err := conn.Link.Get(uint32(iface))
	if err != nil {
		return 0, err
	}
	return msg.Attributes.OperationalState, nil
}