Check hook.isset

Author: louisroyer

runtime/iproutehook.go

@@ -57,6 +57,9 @@ func NewIPRouteHook(name string, env string) IPRouteHook {
 
 // Run the hook if it is set
 func (hook IPRouteHook) Run() error {
+	if !hook.isset {
+		return nil
+	}
 	for _, r := range hook.routes {
 		r = append(r, "proto", "static")
 		if err := runIPRoute(r...); err != nil {

runtime/nat4hook.go

@@ -47,6 +47,9 @@ func NewNat4Hooks() Nat4Hook {
 
 // Runs IPv4 NAT init hook
 func (hook Nat4Hook) RunInit() error {
+	if !hook.isset {
+		return nil
+	}
 	if err := runIP4Tables("-I", "FORWARD", "-j", "ACCEPT"); err != nil {
 		return err
 	}
@@ -60,6 +63,9 @@ func (hook Nat4Hook) RunInit() error {
 
 // Runs IPv4 NAT exit hook
 func (hook Nat4Hook) RunExit() error {
+	if !hook.isset {
+		return nil
+	}
 	errcount := 0
 	var lasterr error
 	for _, iface := range hook.ifaces {