// writeProxyScript is a helper function that // will generate the proxy.sh file in the builder's // temp directory to be added to the Image. func (b *Builder) writeProxyScript(dir string) error { var proxyfile = proxy.Proxy{} // loop through services so that we can // map ip address to localhost for _, container := range b.services { // create an entry for each port for port := range container.NetworkSettings.Ports { proxyfile.Set(port.Port(), container.NetworkSettings.IPAddress) } } // write the proxyfile to the temp directory proxyfilePath := filepath.Join(dir, "proxy.sh") return ioutil.WriteFile(proxyfilePath, proxyfile.Bytes(), 0755) }