func claimNextPort(s cp.Snapshot) (int, error) {
for {
var err error
s, err = s.FastForward()
if err != nil {
return -1, err
}
f, err := s.GetFile(nextPortPath, new(cp.IntCodec))
if err == nil {
port := f.Value.(int)
f, err = f.Set(port + 1)
if err == nil {
return port, nil
}
time.Sleep(time.Second / 10)
} else {
return -1, err
}
}
}
