// EnsureItExists make sure the network exists and return an error if it does not exists
// and cannot be created.
func (n *Network) EnsureItExists(ctx context.Context) error {
networkResource, err := n.Inspect(ctx)
if n.external {
if client.IsErrNetworkNotFound(err) {
// FIXME(vdemeester) introduce some libcompose error type
return fmt.Errorf("Network %s declared as external, but could not be found. Please create the network manually using docker network create %s and try again", n.fullName(), n.fullName())
}
return err
}
if err != nil && client.IsErrNetworkNotFound(err) {
return n.create(ctx)
}
if n.driver != "" && networkResource.Driver != n.driver {
return fmt.Errorf("Network %q needs to be recreated - driver has changed", n.fullName())
}
if len(n.driverOptions) != 0 && !reflect.DeepEqual(networkResource.Options, n.driverOptions) {
return fmt.Errorf("Network %q needs to be recreated - options have changed", n.fullName())
}
return err
}
func validateExternalNetworks(
ctx context.Context,
dockerCli *command.DockerCli,
externalNetworks []string) error {
client := dockerCli.Client()
for _, networkName := range externalNetworks {
network, err := client.NetworkInspect(ctx, networkName)
if err != nil {
if dockerclient.IsErrNetworkNotFound(err) {
return fmt.Errorf("network %q is declared as external, but could not be found. You need to create the network before the stack is deployed (with overlay driver)", networkName)
}
return err
}
if network.Scope != "swarm" {
return fmt.Errorf("network %q is declared as external, but it is not in the right scope: %q instead of %q", networkName, network.Scope, "swarm")
}
}
return nil
}