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coredns/plugin/pkg/dnsutil/join.go

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package dnsutil
import (
"strings"
"github.com/miekg/dns"
)
// Join joins labels to form a fully qualified domain name. If the last label is
// the root label it is ignored. Not other syntax checks are performed.
func Join(labels []string) string {
ll := len(labels)
if labels[ll-1] == "." {
s := strings.Join(labels[:ll-1], ".")
return dns.Fqdn(s)
}
s := strings.Join(labels, ".")
return dns.Fqdn(s)
}