func (s *Service) populateAdditionalHostConfig(hostConfig *containertypes.HostConfig) error {
links, err := s.getLinks()
if err != nil {
return err
}
for _, link := range s.DependentServices() {
if !s.project.ServiceConfigs.Has(link.Target) {
continue
}
service, err := s.project.CreateService(link.Target)
if err != nil {
return err
}
containers, err := service.Containers(context.Background())
if err != nil {
return err
}
if link.Type == project.RelTypeIpcNamespace {
hostConfig, err = addIpc(hostConfig, service, containers, s.serviceConfig.Ipc)
} else if link.Type == project.RelTypeNetNamespace {
hostConfig, err = addNetNs(hostConfig, service, containers, s.serviceConfig.NetworkMode)
}
if err != nil {
return err
}
}
hostConfig.Links = []string{}
for k, v := range links {
hostConfig.Links = append(hostConfig.Links, strings.Join([]string{v, k}, ":"))
}
for _, v := range s.serviceConfig.ExternalLinks {
hostConfig.Links = append(hostConfig.Links, v)
}
return nil
}
// registerLinks writes the links to a file.
func (daemon *Daemon) registerLinks(container *container.Container, hostConfig *containertypes.HostConfig) error {
if hostConfig == nil || hostConfig.Links == nil {
return nil
}
for _, l := range hostConfig.Links {
name, alias, err := runconfigopts.ParseLink(l)
if err != nil {
return err
}
child, err := daemon.GetContainer(name)
if err != nil {
//An error from daemon.GetContainer() 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.GetContainer(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
}
func (daemon *Daemon) setHostConfig(container *container.Container, hostConfig *containertypes.HostConfig) error {
// Do not lock while creating volumes since this could be calling out to external plugins
// Don't want to block other actions, like `docker ps` because we're waiting on an external plugin
if err := daemon.registerMountPoints(container, hostConfig); err != nil {
return err
}
container.Lock()
defer container.Unlock()
// Register any links from the host config before starting the container
if err := daemon.registerLinks(container, hostConfig); err != nil {
return err
}
// make sure links is not nil
// this ensures that on the next daemon restart we don't try to migrate from legacy sqlite links
if hostConfig.Links == nil {
hostConfig.Links = []string{}
}
container.HostConfig = hostConfig
return container.ToDisk()
}