func nsInvoke(path string, prefunc func(nsFD int) error, postfunc func(callerFD int) error) error {
defer InitOSContext()()
f, err := os.OpenFile(path, os.O_RDONLY, 0)
if err != nil {
return fmt.Errorf("failed get network namespace %q: %v", path, err)
}
defer f.Close()
nsFD := f.Fd()
// Invoked before the namespace switch happens but after the namespace file
// handle is obtained.
if err := prefunc(int(nsFD)); err != nil {
return fmt.Errorf("failed in prefunc: %v", err)
}
if err = netns.Set(netns.NsHandle(nsFD)); err != nil {
return err
}
defer ns.SetNamespace()
// Invoked after the namespace switch.
return postfunc(ns.ParseHandlerInt())
}
// InitOSContext initializes OS context while configuring network resources
func InitOSContext() func() {
runtime.LockOSThread()
if err := ns.SetNamespace(); err != nil {
logrus.Error(err)
}
return runtime.UnlockOSThread
}
// InitOSContext initializes OS context while configuring network resources
func InitOSContext() func() {
nsOnce.Do(ns.Init)
runtime.LockOSThread()
if err := ns.SetNamespace(); err != nil {
log.Error(err)
}
return runtime.UnlockOSThread
}
func nsInvoke(path string, prefunc func(nsFD int) error, postfunc func(callerFD int) error) error {
defer InitOSContext()()
newNs, err := netns.GetFromPath(path)
if err != nil {
return fmt.Errorf("failed get network namespace %q: %v", path, err)
}
defer newNs.Close()
// Invoked before the namespace switch happens but after the namespace file
// handle is obtained.
if err := prefunc(int(newNs)); err != nil {
return fmt.Errorf("failed in prefunc: %v", err)
}
if err = netns.Set(newNs); err != nil {
return err
}
defer ns.SetNamespace()
// Invoked after the namespace switch.
return postfunc(ns.ParseHandlerInt())
}