// setupContainerSupport determines what containers can be run on this machine and
// initialises suitable infrastructure to support such containers.
func (a *MachineAgent) setupContainerSupport(runner worker.Runner, st *api.State, entity *apiagent.Entity, agentConfig agent.Config) error {
var supportedContainers []instance.ContainerType
// We don't yet support nested lxc containers but anything else can run an LXC container.
if entity.ContainerType() != instance.LXC {
supportedContainers = append(supportedContainers, instance.LXC)
}
supportsKvm, err := kvm.IsKVMSupported()
if err != nil {
logger.Warningf("determining kvm support: %v\nno kvm containers possible", err)
}
if err == nil && supportsKvm {
supportedContainers = append(supportedContainers, instance.KVM)
}
return a.updateSupportedContainers(runner, st, entity.Tag(), supportedContainers, agentConfig)
}
func setAgentPassword(newPw, oldPw string, a agent.Agent, entity *apiagent.Entity) error {
// Change the configuration *before* setting the entity
// password, so that we avoid the possibility that
// we might successfully change the entity's
// password but fail to write the configuration,
// thus locking us out completely.
if err := a.ChangeConfig(func(c agent.ConfigSetter) error {
c.SetPassword(newPw)
c.SetOldPassword(oldPw)
return nil
}); err != nil {
return err
}
return entity.SetPassword(newPw)
}