func (s *AddRelationSuite) TestAddRelationBlocked(c *gc.C) {
	s.mockAPI.SetErrors(common.OperationBlockedError("TestBlockAddRelation"))
	err := s.runAddRelation(c, "application1", "application2")
	coretesting.AssertOperationWasBlocked(c, err, ".*TestBlockAddRelation.*")
	s.mockAPI.CheckCall(c, 0, "AddRelation", []string{"application1", "application2"})
	s.mockAPI.CheckCall(c, 1, "Close")
}

func (m *mockRunAPI) RunOnAllMachines(commands string, timeout time.Duration) ([]params.ActionResult, error) {
	var result []params.ActionResult

	if m.block {
		return result, common.OperationBlockedError("the operation has been blocked")
	}
	sortedMachineIds := make([]string, 0, len(m.machines))
	for machineId := range m.machines {
		sortedMachineIds = append(sortedMachineIds, machineId)
	}
	sort.Strings(sortedMachineIds)

	for _, machineId := range sortedMachineIds {
		response, found := m.runResponses[machineId]
		if !found {
			// Consider this a timeout
			response = params.ActionResult{
				Action: &params.Action{
					Receiver: names.NewMachineTag(machineId).String(),
				},
				Message: exec.ErrCancelled.Error(),
			}
		}
		result = append(result, response)
	}

	return result, nil
}

func (s *SetSuite) TestBlockedError(c *gc.C) {
	s.fake.err = common.OperationBlockedError("TestBlockedError")
	_, err := s.run(c, "special=extra")
	c.Assert(err, gc.Equals, cmd.ErrSilent)
	// msg is logged
	c.Check(c.GetTestLog(), jc.Contains, "TestBlockedError")
}

func (s *DefaultsCommandSuite) TestResetBlockedError(c *gc.C) {
	s.fake.err = common.OperationBlockedError("TestBlockedError")
	_, err := s.run(c, "--reset", "attr")
	c.Assert(err, gc.Equals, cmd.ErrSilent)
	// msg is logged
	c.Check(c.GetTestLog(), jc.Contains, "TestBlockedError")
}

func (s *AddMachineSuite) TestBlockedError(c *gc.C) {
	s.fakeAddMachine.addError = common.OperationBlockedError("TestBlockedError")
	_, err := s.run(c)
	c.Assert(err, gc.Equals, cmd.ErrSilent)
	// msg is logged
	stripped := strings.Replace(c.GetTestLog(), "\n", "", -1)
	c.Check(stripped, gc.Matches, ".*TestBlockedError.*")
}

func (s *syncToolsSuite) TestAPIAdapterBlockUploadTools(c *gc.C) {
	syncTools = func(sctx *sync.SyncContext) error {
		// Block operation
		return common.OperationBlockedError("TestAPIAdapterBlockUploadTools")
	}
	_, err := s.runSyncToolsCommand(c, "-m", "test-target", "--destination", c.MkDir(), "--stream", "released")
	coretesting.AssertOperationWasBlocked(c, err, ".*TestAPIAdapterBlockUploadTools.*")
}

func (s *ConstraintsCommandsSuite) TestBlockSetService(c *gc.C) {
	s.fake.addTestingService("svc")

	// Block operation
	s.fake.err = common.OperationBlockedError("TestBlockSetService")
	// Set constraints.
	s.assertSetBlocked(c, "-s", "svc", "mem=4G", "cpu-power=250")
}

func (s *AddUnitSuite) TestBlockAddUnit(c *gc.C) {
	// Block operation
	s.fake.err = common.OperationBlockedError("TestBlockAddUnit")
	s.runAddUnit(c, "some-application-name")

	// msg is logged
	stripped := strings.Replace(c.GetTestLog(), "\n", "", -1)
	c.Check(stripped, gc.Matches, ".*TestBlockAddUnit.*")
}

func (s *RemoveMachineSuite) TestBlockedError(c *gc.C) {
	s.fake.removeError = common.OperationBlockedError("TestBlockedError")
	_, err := s.run(c, "1")
	c.Assert(err, gc.Equals, cmd.ErrSilent)
	c.Assert(s.fake.forced, jc.IsFalse)
	// msg is logged
	stripped := strings.Replace(c.GetTestLog(), "\n", "", -1)
	c.Assert(stripped, gc.Matches, ".*TestBlockedError.*")
}

func (s *EnableHASuite) TestBlockEnableHA(c *gc.C) {
	s.fake.err = common.OperationBlockedError("TestBlockEnableHA")
	_, err := s.runEnableHA(c, "-n", "1")
	c.Assert(err, gc.ErrorMatches, cmd.ErrSilent.Error())

	// msg is logged
	stripped := strings.Replace(c.GetTestLog(), "\n", "", -1)
	c.Check(stripped, gc.Matches, ".*TestBlockEnableHA.*")
}

func (s *syncToolsSuite) TestAPIAdapterBlockUploadTools(c *gc.C) {
	syncTools = func(sctx *sync.SyncContext) error {
		// Block operation
		return common.OperationBlockedError("TestAPIAdapterBlockUploadTools")
	}
	_, err := runSyncToolsCommand(c, "-m", "test-target", "--destination", c.MkDir(), "--stream", "released")
	c.Assert(err, gc.ErrorMatches, cmd.ErrSilent.Error())
	// msg is logged
	stripped := strings.Replace(c.GetTestLog(), "\n", "", -1)
	c.Check(stripped, gc.Matches, ".*TestAPIAdapterBlockUploadTools.*")
}

func (m *mockAddUserAPI) AddUser(username, displayname, password string) (names.UserTag, []byte, error) {
	if m.blocked {
		return names.UserTag{}, nil, common.OperationBlockedError("the operation has been blocked")
	}
	m.username = username
	m.displayname = displayname
	m.password = password
	if m.failMessage != "" {
		return names.UserTag{}, nil, errors.New(m.failMessage)
	}
	return names.NewLocalUserTag(username), m.secretKey, nil
}

// DestroySystem will attempt to destroy the system. If the args specify the
// removal of blocks or the destruction of the environments, this method will
// attempt to do so.
func (s *SystemManagerAPI) DestroySystem(args params.DestroySystemArgs) error {
	// Get list of all environments in the system.
	allEnvs, err := s.state.AllEnvironments()
	if err != nil {
		return errors.Trace(err)
	}

	// If there are hosted environments and DestroyEnvironments was not
	// specified, don't bother trying to destroy the system, as it will fail.
	if len(allEnvs) > 1 && !args.DestroyEnvironments {
		return errors.Errorf("state server environment cannot be destroyed before all other environments are destroyed")
	}

	// If there are blocks, and we aren't being told to ignore them, let the
	// user know.
	blocks, err := s.state.AllBlocksForSystem()
	if err != nil {
		logger.Debugf("Unable to get blocks for system: %s", err)
		if !args.IgnoreBlocks {
			return errors.Trace(err)
		}
	}
	if len(blocks) > 0 {
		if !args.IgnoreBlocks {
			return common.OperationBlockedError("found blocks in system environments")
		}

		err := s.state.RemoveAllBlocksForSystem()
		if err != nil {
			return errors.Trace(err)
		}
	}

	systemEnv, err := s.state.StateServerEnvironment()
	if err != nil {
		return errors.Trace(err)
	}
	systemTag := systemEnv.EnvironTag()

	if args.DestroyEnvironments {
		for _, env := range allEnvs {
			environTag := env.EnvironTag()
			if environTag != systemTag {
				if err := common.DestroyEnvironment(s.state, environTag); err != nil {
					logger.Errorf("unable to destroy environment %q: %s", env.UUID(), err)
				}
			}
		}
	}

	return errors.Trace(common.DestroyEnvironment(s.state, systemTag))
}

func (s *SetSuite) TestBlockSetConfig(c *gc.C) {
	// Block operation
	s.fakeServiceAPI.err = common.OperationBlockedError("TestBlockSetConfig")
	ctx := coretesting.ContextForDir(c, s.dir)
	code := cmd.Main(service.NewSetCommandWithAPI(s.fakeClientAPI, s.fakeServiceAPI), ctx, []string{
		"dummy-service",
		"--config",
		"testconfig.yaml"})
	c.Check(code, gc.Equals, 1)
	// msg is logged
	stripped := strings.Replace(c.GetTestLog(), "\n", "", -1)
	c.Check(stripped, gc.Matches, ".*TestBlockSetConfig.*")
}

func (s *ControllerAPI) ensureNotBlocked(args params.DestroyControllerArgs) error {
	// If there are blocks let the user know.
	blocks, err := s.state.AllBlocksForController()
	if err != nil {
		logger.Debugf("Unable to get blocks for controller: %s", err)
		return errors.Trace(err)
	}

	if len(blocks) > 0 {
		return common.OperationBlockedError("found blocks in controller models")
	}
	return nil
}

func (s *configCommandSuite) TestBlockSetConfig(c *gc.C) {
	// Block operation
	s.fake.err = common.OperationBlockedError("TestBlockSetConfig")
	ctx := coretesting.ContextForDir(c, s.dir)
	code := cmd.Main(application.NewConfigCommandForTest(s.fake), ctx, []string{
		"dummy-application",
		"--file",
		"testconfig.yaml"})
	c.Check(code, gc.Equals, 1)
	// msg is logged
	stripped := strings.Replace(c.GetTestLog(), "\n", "", -1)
	c.Check(stripped, gc.Matches, ".*TestBlockSetConfig.*")
}

func (s *UpgradeJujuSuite) TestBlockUpgradeInProgress(c *gc.C) {
	fakeAPI := NewFakeUpgradeJujuAPI(c, s.State)
	fakeAPI.setVersionErr = common.OperationBlockedError("the operation has been blocked")
	fakeAPI.patch(s)
	cmd := &upgradeJujuCommand{}
	err := coretesting.InitCommand(modelcmd.Wrap(cmd), []string{})
	c.Assert(err, jc.ErrorIsNil)

	// Block operation
	s.BlockAllChanges(c, "TestBlockUpgradeInProgress")
	err = modelcmd.Wrap(cmd).Run(coretesting.Context(c))
	s.AssertBlocked(c, err, ".*To enable changes.*")
}

func (s *UnsetSuite) TestBlockUnset(c *gc.C) {
	// Block operation
	s.fake.err = common.OperationBlockedError("TestBlockUnset")
	ctx := coretesting.ContextForDir(c, s.dir)
	code := cmd.Main(service.NewUnsetCommand(s.fake), ctx, []string{
		"dummy-service",
		"username"})
	c.Check(code, gc.Equals, 1)

	// msg is logged
	stripped := strings.Replace(c.GetTestLog(), "\n", "", -1)
	c.Check(stripped, gc.Matches, ".*TestBlockUnset.*")
}

func (s *retryProvisioningSuite) TestBlockRetryProvisioning(c *gc.C) {
	s.fake.err = common.OperationBlockedError("TestBlockRetryProvisioning")
	command := model.NewRetryProvisioningCommandForTest(s.fake)

	for i, t := range resolvedMachineTests {
		c.Logf("test %d: %v", i, t.args)
		_, err := testing.RunCommand(c, command, t.args...)
		if t.err != "" {
			c.Check(err, gc.ErrorMatches, t.err)
			continue
		}
		testing.AssertOperationWasBlocked(c, err, ".*TestBlockRetryProvisioning.*")
	}
}

func (s *retryProvisioningSuite) TestBlockRetryProvisioning(c *gc.C) {
	s.fake.err = common.OperationBlockedError("TestBlockRetryProvisioning")
	command := environment.NewRetryProvisioningCommand(s.fake)

	for i, t := range resolvedMachineTests {
		c.Logf("test %d: %v", i, t.args)
		_, err := testing.RunCommand(c, command, t.args...)
		if t.err != "" {
			c.Check(err, gc.ErrorMatches, t.err)
			continue
		}
		c.Assert(err, gc.ErrorMatches, cmd.ErrSilent.Error())
		// msg is logged
		stripped := strings.Replace(c.GetTestLog(), "\n", "", -1)
		c.Check(stripped, gc.Matches, ".*TestBlockRetryProvisioning.*")
	}
}