Ejemplo n.º 1
0
func InitPreStart(dockerSocket string, id containers.Identifier, imageName string) error {
	var (
		err     error
		imgInfo *dc.Image
		d       *docker.DockerClient
	)

	_, socketActivationType, err := containers.GetSocketActivation(id)
	if err != nil {
		fmt.Printf("init_pre_start: Error while parsing unit file: %v\n", err)
		return err
	}

	if _, err = user.Lookup(id.LoginFor()); err != nil {
		if _, ok := err.(user.UnknownUserError); !ok {
			return err
		}
		if err = createUser(id); err != nil {
			return err
		}
	}

	if d, err = docker.GetConnection(dockerSocket); err != nil {
		return err
	}

	if imgInfo, err = d.GetImage(imageName); err != nil {
		return err
	}

	if err := os.MkdirAll(id.HomePath(), 0700); err != nil {
		return err
	}

	u, _ := user.Lookup(id.LoginFor())
	volumes := make([]string, 0, 10)
	for volPath := range imgInfo.Config.Volumes {
		volumes = append(volumes, volPath)
	}

	user := imgInfo.Config.User
	if user == "" {
		user = "******"
	}

	ports, err := containers.GetExistingPorts(id)
	if err != nil {
		fmt.Printf("container init pre-start: Unable to retrieve port mapping\n")
		return err
	}

	containerData := containers.ContainerInitScript{
		imgInfo.Config.User == "",
		user,
		u.Uid,
		u.Gid,
		strings.Join(imgInfo.Config.Cmd, " "),
		len(volumes) > 0,
		strings.Join(volumes, " "),
		ports,
		socketActivationType == "proxied",
	}

	file, _, err := utils.OpenFileExclusive(path.Join(id.RunPathFor(), "container-init.sh"), 0700)
	if err != nil {
		fmt.Printf("container init pre-start: Unable to open script file: %v\n", err)
		return err
	}
	defer file.Close()

	if erre := containers.ContainerInitTemplate.Execute(file, containerData); erre != nil {
		fmt.Printf("container init pre-start: Unable to output template: ", erre)
		return erre
	}
	if err := file.Close(); err != nil {
		return err
	}

	file, _, err = utils.OpenFileExclusive(path.Join(id.RunPathFor(), "container-cmd.sh"), 0705)
	if err != nil {
		fmt.Printf("container init pre-start: Unable to open cmd script file: %v\n", err)
		return err
	}
	defer file.Close()

	if erre := containers.ContainerCmdTemplate.Execute(file, containerData); erre != nil {
		fmt.Printf("container init pre-start: Unable to output cmd template: ", erre)
		return erre
	}
	if err := file.Close(); err != nil {
		return err
	}

	return nil
}