Factor out the wait-for-interface code

nameserver/if_utils.go

@@ -1,32 +0,0 @@
-package nameserver
-
-import (
-	"fmt"
-	"net"
-	"time"
-)
-
-func EnsureInterface(ifaceName string, wait int) (iface *net.Interface, err error) {
-	if iface, err = findInterface(ifaceName); err == nil || wait == 0 {
-		return
-	}
-	Info.Println("Waiting for interface", ifaceName, "to come up")
-	for ; err != nil && wait > 0; wait -= 1 {
-		time.Sleep(1 * time.Second)
-		iface, err = findInterface(ifaceName)
-	}
-	if err == nil {
-		Info.Println("Interface", ifaceName, "is up")
-	}
-	return
-}
-
-func findInterface(ifaceName string) (iface *net.Interface, err error) {
-	if iface, err = net.InterfaceByName(ifaceName); err != nil {
-		return iface, fmt.Errorf("Unable to find interface %s", ifaceName)
-	}
-	if 0 == (net.FlagUp & iface.Flags) {
-		return iface, fmt.Errorf("Interface %s is not up", ifaceName)
-	}
-	return
-}