dyndns/cmd/dns-update.go

package cmd

import (
	"log"

	"gitea.nehmer.net/torben/dyndns/service"
	"github.com/spf13/cobra"
)

var cmdDNSUpdate = &cobra.Command{
	Use:   "dns-update",
	Short: "Dynamically update a DNS record",
	Long: `Dynamically updates a given DNS FQDN based on the given v4 and/or v6 addresses.
At least one IP must be specified, the call fails if both IPs are empty.`,
	// Run is defined inline in init to capture Flag variables in the closure
}

func init() {
	rootCmd.AddCommand(cmdDNSUpdate)
	ip4 := cmdDNSUpdate.Flags().IPP("ipv4", "4", nil, "IPv4 Address to set")
	ip6 := cmdDNSUpdate.Flags().IPP("ipv6", "6", nil, "IPv6 Address to set")
	name := cmdDNSUpdate.Flags().StringP("name", "n", "", "Hostname to set within the domain")
	cmdDNSUpdate.MarkFlagRequired("name")
	domain := cmdDNSUpdate.Flags().StringP("domain", "d", "", "Domain to set the records in.")
	cmdDNSUpdate.MarkFlagRequired("domain")

	cmdDNSUpdate.Run = func(cmd *cobra.Command, args []string) {
		service.LoadConfig()

		err := service.DNSUpdateEntry(*domain, *name, *ip4, *ip6)
		if err != nil {
			log.Fatalf("Could not update DNS: %s", err)
		}
		log.Println("DNS has been successfully updated.")
	}

}