func (s *EnvironmentVersionSuite) TestSuccess(c *gc.C) {
	vs := "1.22.1"
	s.fake.agentVersion = vs
	v, err := envcmd.GetEnvironmentVersion(s.fake)
	c.Assert(err, jc.ErrorIsNil)
	c.Assert(v.Compare(version.MustParse(vs)), gc.Equals, 0)
}

func (s *EnvironmentVersionSuite) TestInvalidVersion(c *gc.C) {
	s.fake.agentVersion = "a.b.c"
	_, err := envcmd.GetEnvironmentVersion(s.fake)
	c.Assert(err, gc.ErrorMatches, "unable to parse environment version: .+")
}

func (s *EnvironmentVersionSuite) TestInvalidVersionType(c *gc.C) {
	s.fake.agentVersion = 99
	_, err := envcmd.GetEnvironmentVersion(s.fake)
	c.Assert(err, gc.ErrorMatches, "invalid environment version type in config")
}

func (s *EnvironmentVersionSuite) TestNoVersion(c *gc.C) {
	_, err := envcmd.GetEnvironmentVersion(s.fake)
	c.Assert(err, gc.ErrorMatches, "version not found in environment config")
}

func (s *EnvironmentVersionSuite) TestApiCallFails(c *gc.C) {
	s.fake.err = errors.New("boom")
	_, err := envcmd.GetEnvironmentVersion(s.fake)
	c.Assert(err, gc.ErrorMatches, "unable to retrieve environment config: boom")
}

func (c *addCommand) Run(ctx *cmd.Context) error {
	client, err := c.getClientAPI()
	if err != nil {
		return errors.Trace(err)
	}
	defer client.Close()

	var machineManager MachineManagerAPI
	if len(c.Disks) > 0 {
		machineManager, err = c.getMachineManagerAPI()
		if err != nil {
			return errors.Trace(err)
		}
		defer machineManager.Close()
		if machineManager.BestAPIVersion() < 1 {
			return errors.New("cannot add machines with disks: not supported by the API server")
		}
	}

	logger.Infof("load config")
	var config *config.Config
	if defaultStore, err := configstore.Default(); err != nil {
		return err
	} else if config, err = c.Config(defaultStore, client); err != nil {
		return err
	}

	if c.Placement != nil && c.Placement.Scope == "ssh" {
		logger.Infof("manual provisioning")
		args := manual.ProvisionMachineArgs{
			Host:   c.Placement.Directive,
			Client: client,
			Stdin:  ctx.Stdin,
			Stdout: ctx.Stdout,
			Stderr: ctx.Stderr,
			UpdateBehavior: &params.UpdateBehavior{
				config.EnableOSRefreshUpdate(),
				config.EnableOSUpgrade(),
			},
		}
		machineId, err := manualProvisioner(args)
		if err == nil {
			ctx.Infof("created machine %v", machineId)
		}
		return err
	}

	logger.Infof("environment provisioning")
	if c.Placement != nil && c.Placement.Scope == "env-uuid" {
		c.Placement.Scope = client.EnvironmentUUID()
	}

	if c.Placement != nil && c.Placement.Scope == instance.MachineScope {
		// It does not make sense to add-machine <id>.
		return fmt.Errorf("machine-id cannot be specified when adding machines")
	}

	jobs := []multiwatcher.MachineJob{multiwatcher.JobHostUnits}

	envVersion, err := envcmd.GetEnvironmentVersion(client)
	if err != nil {
		return err
	}

	// Servers before 1.21-alpha2 don't have the networker so don't
	// try to use JobManageNetworking with them.
	//
	// In case of MAAS and Joyent JobManageNetworking is not added
	// to ensure the non-intrusive start of a networker like above
	// for the manual provisioning. See this related joyent bug
	// http://pad.lv/1401423
	if envVersion.Compare(version.MustParse("1.21-alpha2")) >= 0 &&
		config.Type() != provider.MAAS &&
		config.Type() != provider.Joyent {
		jobs = append(jobs, multiwatcher.JobManageNetworking)
	}

	machineParams := params.AddMachineParams{
		Placement:   c.Placement,
		Series:      c.Series,
		Constraints: c.Constraints,
		Jobs:        jobs,
		Disks:       c.Disks,
	}
	machines := make([]params.AddMachineParams, c.NumMachines)
	for i := 0; i < c.NumMachines; i++ {
		machines[i] = machineParams
	}

	var results []params.AddMachinesResult
	// If storage is specified, we attempt to use a new API on the service facade.
	if len(c.Disks) > 0 {
		results, err = machineManager.AddMachines(machines)
	} else {
		results, err = client.AddMachines(machines)
		if params.IsCodeNotImplemented(err) {
			if c.Placement != nil {
				containerType, parseErr := instance.ParseContainerType(c.Placement.Scope)
				if parseErr != nil {
					// The user specified a non-container placement directive:
//.........这里部分代码省略.........