package common import ( "github.com/docker/go-connections/nat" "github.com/pkg/errors" ) func verifyExpose(expose []string) error { // add the expose ports from the user (--expose) // can be single or a range for _, expose := range expose { //support two formats for expose, original format /[] or /[] _, port := nat.SplitProtoPort(expose) //parse the start and end port and create a sequence of ports to expose //if expose a port, the start and end port are the same _, _, err := nat.ParsePortRange(port) if err != nil { return errors.Wrapf(err, "invalid range format for --expose: %s", expose) } } return nil }