// registerLinks sets up links between containers and writes the
// configuration out for persistence.
func (daemon *Daemon) registerLinks(container *Container, hostConfig *runconfig.HostConfig) error {
// TODO Windows. Factored out for network modes. There may be more
// refactoring required here.
if hostConfig == nil || hostConfig.Links == nil {
return nil
}
for _, l := range hostConfig.Links {
name, alias, err := parsers.ParseLink(l)
if err != nil {
return err
}
child, err := daemon.Get(name)
if err != nil {
//An error from daemon.Get() means this name could not be found
return fmt.Errorf("Could not get container for %s", name)
}
if err := daemon.registerLink(container, child, alias); err != nil {
return err
}
}
// After we load all the links into the daemon
// set them to nil on the hostconfig
hostConfig.Links = nil
if err := container.writeHostConfig(); err != nil {
return err
}
return nil
}
func (daemon *Daemon) RegisterLinks(container *Container, hostConfig *runconfig.HostConfig) error {
if hostConfig == nil || hostConfig.Links == nil {
return nil
}
for _, l := range hostConfig.Links {
name, alias, err := parsers.ParseLink(l)
if err != nil {
return err
}
child, err := daemon.Get(name)
if err != nil {
//An error from daemon.Get() means this name could not be found
return fmt.Errorf("Could not get container for %s", name)
}
for child.hostConfig.NetworkMode.IsContainer() {
parts := strings.SplitN(string(child.hostConfig.NetworkMode), ":", 2)
child, err = daemon.Get(parts[1])
if err != nil {
return fmt.Errorf("Could not get container for %s", parts[1])
}
}
if child.hostConfig.NetworkMode.IsHost() {
return runconfig.ErrConflictHostNetworkAndLinks
}
if err := daemon.RegisterLink(container, child, alias); err != nil {
return err
}
}
// After we load all the links into the daemon
// set them to nil on the hostconfig
hostConfig.Links = nil
if err := container.WriteHostConfig(); err != nil {
return err
}
return nil
}
// ValidateLink Validates that the specified string has a valid link format (containerName:alias).
func ValidateLink(val string) (string, error) {
if _, _, err := parsers.ParseLink(val); err != nil {
return val, err
}
return val, nil
}