func (s *ProxyUpdaterSuite) TestEnvironmentVariables(c *gc.C) {
	setenv := func(proxy, value string) {
		os.Setenv(proxy, value)
		os.Setenv(strings.ToUpper(proxy), value)
	}
	setenv("http_proxy", "foo")
	setenv("https_proxy", "foo")
	setenv("ftp_proxy", "foo")
	setenv("no_proxy", "foo")

	proxySettings, _ := s.updateConfig(c)

	updater, err := proxyupdater.New(s.environmentAPI, true)
	c.Assert(err, jc.ErrorIsNil)
	defer worker.Stop(updater)
	s.waitForPostSetup(c)
	s.waitProxySettings(c, proxySettings)

	assertEnv := func(proxy, value string) {
		c.Assert(os.Getenv(proxy), gc.Equals, value)
		c.Assert(os.Getenv(strings.ToUpper(proxy)), gc.Equals, value)
	}
	assertEnv("http_proxy", proxySettings.Http)
	assertEnv("https_proxy", proxySettings.Https)
	assertEnv("ftp_proxy", proxySettings.Ftp)
	assertEnv("no_proxy", proxySettings.NoProxy)
}

func (s *ProxyUpdaterSuite) TestDontWriteSystemFiles(c *gc.C) {
	proxySettings, _ := s.updateConfig(c)

	updater := proxyupdater.New(s.environmentAPI, false)
	defer worker.Stop(updater)
	s.waitForPostSetup(c)

	s.waitProxySettings(c, proxySettings)
	c.Assert(pacconfig.AptProxyConfigFile, jc.DoesNotExist)
	c.Assert(s.proxyFile, jc.DoesNotExist)
}

func (s *ProxyUpdaterSuite) TestInitialState(c *gc.C) {
	proxySettings, aptProxySettings := s.updateConfig(c)

	updater := proxyupdater.New(s.environmentAPI, true)
	defer worker.Stop(updater)

	s.waitProxySettings(c, proxySettings)
	s.waitForFile(c, s.proxyFile, proxySettings.AsScriptEnvironment()+"\n")

	paccmder, err := commands.NewPackageCommander(version.Current.Series)
	c.Assert(err, jc.ErrorIsNil)
	s.waitForFile(c, pacconfig.AptProxyConfigFile, paccmder.ProxyConfigContents(aptProxySettings)+"\n")
}

func (s *ProxyUpdaterSuite) TestWriteSystemFiles(c *gc.C) {
	proxySettings, aptProxySettings := s.updateConfig(c)

	updater := proxyupdater.New(s.environmentAPI, true)
	defer worker.Stop(updater)
	s.waitForPostSetup(c)

	s.waitProxySettings(c, proxySettings)
	s.waitForFile(c, s.proxyFile, proxySettings.AsScriptEnvironment()+"\n")

	paccmder, err := commands.NewPackageCommander(series.HostSeries())
	c.Assert(err, jc.ErrorIsNil)
	s.waitForFile(c, pacconfig.AptProxyConfigFile, paccmder.ProxyConfigContents(aptProxySettings)+"\n")
}

func (a *UnitAgent) APIWorkers() (_ worker.Worker, err error) {
	agentConfig := a.CurrentConfig()
	dataDir := agentConfig.DataDir()
	hookLock, err := cmdutil.HookExecutionLock(dataDir)
	if err != nil {
		return nil, err
	}
	st, entity, err := OpenAPIState(agentConfig, a)
	if err != nil {
		return nil, err
	}
	unitTag, err := names.ParseUnitTag(entity.Tag())
	if err != nil {
		return nil, errors.Trace(err)
	}
	// Ensure that the environment uuid is stored in the agent config.
	// Luckily the API has it recorded for us after we connect.
	if agentConfig.Environment().Id() == "" {
		err := a.ChangeConfig(func(setter agent.ConfigSetter) error {
			environTag, err := st.EnvironTag()
			if err != nil {
				return errors.Annotate(err, "no environment uuid set on api")
			}

			return setter.Migrate(agent.MigrateParams{
				Environment: environTag,
			})
		})
		if err != nil {
			logger.Warningf("unable to save environment uuid: %v", err)
			// Not really fatal, just annoying.
		}
	}

	defer func() {
		if err != nil {
			st.Close()
			reportClosedUnitAPI(st)
		}
	}()

	// Before starting any workers, ensure we record the Juju version this unit
	// agent is running.
	currentTools := &tools.Tools{Version: version.Current}
	apiStateUpgrader := a.getUpgrader(st)
	if err := apiStateUpgrader.SetVersion(agentConfig.Tag().String(), currentTools.Version); err != nil {
		return nil, errors.Annotate(err, "cannot set unit agent version")
	}

	runner := worker.NewRunner(cmdutil.ConnectionIsFatal(logger, st), cmdutil.MoreImportant)
	// start proxyupdater first to ensure proxy settings are correct
	runner.StartWorker("proxyupdater", func() (worker.Worker, error) {
		return proxyupdater.New(st.Environment(), false), nil
	})
	runner.StartWorker("upgrader", func() (worker.Worker, error) {
		return upgrader.NewAgentUpgrader(
			st.Upgrader(),
			agentConfig,
			agentConfig.UpgradedToVersion(),
			func() bool { return false },
			a.initialAgentUpgradeCheckComplete,
		), nil
	})
	runner.StartWorker("logger", func() (worker.Worker, error) {
		return workerlogger.NewLogger(st.Logger(), agentConfig), nil
	})
	runner.StartWorker("uniter", func() (worker.Worker, error) {
		uniterFacade, err := st.Uniter()
		if err != nil {
			return nil, errors.Trace(err)
		}
		uniterParams := uniter.UniterParams{
			uniterFacade,
			unitTag,
			leadership.NewClient(st),
			dataDir,
			hookLock,
			uniter.NewMetricsTimerChooser(),
			uniter.NewUpdateStatusTimer(),
		}
		return uniter.NewUniter(&uniterParams), nil
	})

	runner.StartWorker("apiaddressupdater", func() (worker.Worker, error) {
		uniterFacade, err := st.Uniter()
		if err != nil {
			return nil, errors.Trace(err)
		}
		return apiaddressupdater.NewAPIAddressUpdater(uniterFacade, a), nil
	})
	runner.StartWorker("rsyslog", func() (worker.Worker, error) {
		return cmdutil.NewRsyslogConfigWorker(st.Rsyslog(), agentConfig, rsyslog.RsyslogModeForwarding)
	})
	return cmdutil.NewCloseWorker(logger, runner, st), nil
}

func (s *ProxyUpdaterSuite) TestRunStop(c *gc.C) {
	updater, err := proxyupdater.New(s.environmentAPI, false)
	c.Assert(err, jc.ErrorIsNil)
	err = worker.Stop(updater)
	c.Assert(err, jc.ErrorIsNil)
}

func (s *ProxyUpdaterSuite) TestRunStop(c *gc.C) {
	updater := proxyupdater.New(s.environmentAPI, false)
	c.Assert(worker.Stop(updater), gc.IsNil)
}