package daemon import ( "fmt" "os" "strings" "github.com/docker/docker/engine" "github.com/docker/docker/runconfig" ) func (daemon *Daemon) ContainerStart(job *engine.Job) engine.Status { if len(job.Args) < 1 { return job.Errorf("Usage: %s container_id", job.Name) } var ( name = job.Args[0] ) container, err := daemon.Get(name) if err != nil { return job.Error(err) } if container.IsPaused() { return job.Errorf("Cannot start a paused container, try unpause instead.") } if container.IsRunning() { return job.Errorf("Container already started") } // If no environment was set, then no hostconfig was passed. // This is kept for backward compatibility - hostconfig should be passed when // creating a container, not during start. if len(job.Environ()) > 0 { hostConfig := runconfig.ContainerHostConfigFromJob(job) if err := daemon.setHostConfig(container, hostConfig); err != nil { return job.Error(err) } } if err := container.Start(); err != nil { container.LogEvent("die") return job.Errorf("Cannot start container %s: %s", name, err) } return engine.StatusOK } func (daemon *Daemon) setHostConfig(container *Container, hostConfig *runconfig.HostConfig) error { container.Lock() defer container.Unlock() if err := parseSecurityOpt(container, hostConfig); err != nil { return err } // FIXME: this should be handled by the volume subsystem // Validate the HostConfig binds. Make sure that: // the source exists for _, bind := range hostConfig.Binds { splitBind := strings.Split(bind, ":") source := splitBind[0] // ensure the source exists on the host _, err := os.Stat(source) if err != nil && os.IsNotExist(err) { err = os.MkdirAll(source, 0755) if err != nil { return fmt.Errorf("Could not create local directory '%s' for bind mount: %v!", source, err) } } } // Register any links from the host config before starting the container if err := daemon.RegisterLinks(container, hostConfig); err != nil { return err } container.hostConfig = hostConfig container.toDisk() return nil }