Support starting the Azure emulator

CLAUDE.md

@@ -63,7 +63,7 @@ When no config file exists, lstk creates one at `$HOME/.config/lstk/config.toml`
 Use `lstk config path` to print the resolved config file path currently in use.
 When adding a new command that depends on configuration, wire config initialization explicitly in that command (`PreRunE: initConfig`). Keep side-effect-free commands (e.g., `version`, `config path`) without config initialization.
 
-Created automatically on first run with defaults. Supports emulator types: `aws` and `snowflake`.
+Created automatically on first run with defaults. Supports emulator types: `aws`, `snowflake`, and `azure`.
 
 # Emulator Setup Commands
 

internal/config/containers.go

@@ -29,10 +29,21 @@ var emulatorDisplayNames = map[EmulatorType]string{
 }
 
 // SelectableEmulatorTypes lists the emulator types available for interactive selection,
-// in the order they should be presented. The selection key for each type is its first character.
-var SelectableEmulatorTypes = []EmulatorType{EmulatorAWS, EmulatorSnowflake}
+// in the order they should be presented.
+var SelectableEmulatorTypes = []EmulatorType{EmulatorAWS, EmulatorSnowflake, EmulatorAzure}
+
+// emulatorSelectionKeys assigns each selectable type a unique single-character key.
+// "aws" and "azure" both start with 'a', so keys can't simply be the first character.
+var emulatorSelectionKeys = map[EmulatorType]string{
+	EmulatorAWS:       "a",
+	EmulatorSnowflake: "s",
+	EmulatorAzure:     "z",
+}
 
 func (e EmulatorType) SelectionKey() string {
+	if key, ok := emulatorSelectionKeys[e]; ok {
+		return key
+	}
 	return string(e)[0:1]
 }
 
@@ -47,9 +58,18 @@ func (e EmulatorType) DisplayName() string {
 	return fmt.Sprintf("LocalStack %s Emulator", e.ShortName())
 }
 
+// SelfValidatesLicense reports whether the emulator container performs its own
+// license activation on startup. For these emulators lstk skips its pre-flight
+// platform license check (the LocalStack platform API has no catalog entry for
+// them), and lets the container validate the token against the licensing server.
+func (e EmulatorType) SelfValidatesLicense() bool {
+	return e == EmulatorSnowflake || e == EmulatorAzure
+}
+
 var emulatorHealthPaths = map[EmulatorType]string{
 	EmulatorAWS:       "/_localstack/health",
 	EmulatorSnowflake: "/_localstack/health",
+	EmulatorAzure:     "/_localstack/health",
 }
 
 var knownImages = []struct {
@@ -60,6 +80,7 @@ var knownImages = []struct {
 	{EmulatorAWS, "localstack-pro", true},
 	{EmulatorAWS, "localstack", false},
 	{EmulatorSnowflake, "snowflake", true},
+	{EmulatorAzure, "localstack-azure-alpha", true},
 }
 
 func EmulatorTypeForImage(image string) EmulatorType {
@@ -211,7 +232,7 @@ func (c *ContainerConfig) HealthPath() (string, error) {
 
 func (c *ContainerConfig) ContainerPort() (string, error) {
 	switch c.Type {
-	case EmulatorAWS, EmulatorSnowflake:
+	case EmulatorAWS, EmulatorSnowflake, EmulatorAzure:
 		return DefaultAWSPort + "/tcp", nil
 	default:
 		return "", fmt.Errorf("%s emulator not supported yet by lstk", c.Type)

internal/config/containers_test.go

@@ -116,6 +116,38 @@ func TestValidate_ValidPort(t *testing.T) {
 	assert.NoError(t, c.Validate())
 }
 
+func TestAzureEmulatorResolvesStartMetadata(t *testing.T) {
+	c := &ContainerConfig{Type: EmulatorAzure, Port: "4566"}
+
+	image, err := c.Image()
+	require.NoError(t, err)
+	assert.Equal(t, "localstack/localstack-azure-alpha:latest", image)
+
+	productName, err := c.ProductName()
+	require.NoError(t, err)
+	assert.Equal(t, "localstack-azure-alpha", productName)
+
+	healthPath, err := c.HealthPath()
+	require.NoError(t, err)
+	assert.Equal(t, "/_localstack/health", healthPath)
+
+	containerPort, err := c.ContainerPort()
+	require.NoError(t, err)
+	assert.Equal(t, "4566/tcp", containerPort)
+}
+
+func TestEmulatorTypeForImage_Azure(t *testing.T) {
+	assert.Equal(t, EmulatorAzure, EmulatorTypeForImage("localstack/localstack-azure-alpha:latest"))
+}
+
+func TestSelfValidatesLicense(t *testing.T) {
+	// Snowflake and Azure containers activate their own license against the
+	// licensing server, so lstk skips its pre-flight platform license check.
+	assert.True(t, EmulatorSnowflake.SelfValidatesLicense())
+	assert.True(t, EmulatorAzure.SelfValidatesLicense())
+	assert.False(t, EmulatorAWS.SelfValidatesLicense())
+}
+
 func TestValidate_MinMaxPorts(t *testing.T) {
 	c := &ContainerConfig{Type: EmulatorAWS, Port: "1"}
 	assert.NoError(t, c.Validate())

internal/container/label.go

@@ -39,7 +39,7 @@ func ResolveEmulatorLabel(ctx context.Context, client api.PlatformAPI, container
 
 	tag := c.Tag
 	if tag == "" || tag == "latest" {
-		if c.Type == config.EmulatorSnowflake {
+		if c.Type.SelfValidatesLicense() {
 			return "LocalStack", false
 		}
 		apiCtx, cancel := context.WithTimeout(ctx, 2*time.Second)

internal/container/start.go

@@ -315,7 +315,7 @@ func pullImages(ctx context.Context, rt runtime.Runtime, sink output.Sink, tel *
 func tryPrePullLicenseValidation(ctx context.Context, sink output.Sink, opts StartOptions, containers []runtime.ContainerConfig, token, licenseFilePath string) ([]runtime.ContainerConfig, error) {
 	var needsPostPull []runtime.ContainerConfig
 	for _, c := range containers {
-		if c.EmulatorType == config.EmulatorSnowflake {
+		if c.EmulatorType.SelfValidatesLicense() {
 			continue
 		}
 
@@ -347,7 +347,7 @@ func tryPrePullLicenseValidation(ctx context.Context, sink output.Sink, opts Sta
 // Fallback path: inspects each pulled image for its version, then validates the license.
 func validateLicensesFromImages(ctx context.Context, rt runtime.Runtime, sink output.Sink, opts StartOptions, containers []runtime.ContainerConfig, token, licenseFilePath string) error {
 	for _, c := range containers {
-		if c.EmulatorType == config.EmulatorSnowflake {
+		if c.EmulatorType.SelfValidatesLicense() {
 			continue
 		}
 
@@ -385,10 +385,10 @@ func startContainers(ctx context.Context, rt runtime.Runtime, sink output.Sink,
 			sink.Emit(output.SpinnerStop())
 			errCode := telemetry.ErrCodeStartFailed
 			var licErr *licenseNotCoveredError
-			if errors.As(err, &licErr) && c.EmulatorType == config.EmulatorSnowflake {
+			if errors.As(err, &licErr) && c.EmulatorType.SelfValidatesLicense() {
 				errCode = telemetry.ErrCodeLicenseInvalid
 				sink.Emit(output.ErrorEvent{
-					Title: "Your license does not include the Snowflake emulator.",
+					Title: fmt.Sprintf("Your license does not include the %s emulator.", c.EmulatorType.ShortName()),
 					Actions: []output.ErrorAction{
 						{Label: "Sign up for a free trial:", Value: "https://app.localstack.cloud/sign-up"},
 						{Label: "Contact our team:", Value: "https://www.localstack.cloud/demo"},

internal/container/start_test.go

@@ -157,7 +157,7 @@ func TestSelectContainersToStart_AttachesWhenExternalContainerOnConfiguredPort(t
 	}
 
 	mockRT.EXPECT().IsRunning(gomock.Any(), c.Name).Return(false, nil)
-	mockRT.EXPECT().FindRunningByImage(gomock.Any(), []string{"localstack/localstack-pro", "localstack/localstack", "localstack/snowflake"}, "4566/tcp").
+	mockRT.EXPECT().FindRunningByImage(gomock.Any(), []string{"localstack/localstack-pro", "localstack/localstack", "localstack/snowflake", "localstack/localstack-azure-alpha"}, "4566/tcp").
 		Return(&runtime.RunningContainer{Name: "external-container", Image: "localstack/localstack-pro:3.5.0", BoundPort: "4566"}, nil)
 	mockRT.EXPECT().ContainerEnv(gomock.Any(), "external-container").Return(nil, nil)
 
@@ -186,7 +186,7 @@ func TestSelectContainersToStart_AttachesWhenExternalContainerVersionDiffers(t *
 	}
 
 	mockRT.EXPECT().IsRunning(gomock.Any(), c.Name).Return(false, nil)
-	mockRT.EXPECT().FindRunningByImage(gomock.Any(), []string{"localstack/localstack-pro", "localstack/localstack", "localstack/snowflake"}, "4566/tcp").
+	mockRT.EXPECT().FindRunningByImage(gomock.Any(), []string{"localstack/localstack-pro", "localstack/localstack", "localstack/snowflake", "localstack/localstack-azure-alpha"}, "4566/tcp").
 		Return(&runtime.RunningContainer{Name: "external-container", Image: "localstack/localstack-pro:3.5.0", BoundPort: "4566"}, nil)
 	mockRT.EXPECT().ContainerEnv(gomock.Any(), "external-container").Return(nil, nil)
 
@@ -220,7 +220,7 @@ func TestSelectContainersToStart_QueuesContainerWhenNoneRunningOnPort(t *testing
 	}
 
 	mockRT.EXPECT().IsRunning(gomock.Any(), c.Name).Return(false, nil)
-	mockRT.EXPECT().FindRunningByImage(gomock.Any(), []string{"localstack/localstack-pro", "localstack/localstack", "localstack/snowflake"}, "4566/tcp").
+	mockRT.EXPECT().FindRunningByImage(gomock.Any(), []string{"localstack/localstack-pro", "localstack/localstack", "localstack/snowflake", "localstack/localstack-azure-alpha"}, "4566/tcp").
 		Return(nil, nil)
 
 	sink := output.NewPlainSink(io.Discard)
@@ -246,7 +246,7 @@ func TestSelectContainersToStart_ErrorsOnEmulatorTypeMismatch(t *testing.T) {
 	}
 
 	mockRT.EXPECT().IsRunning(gomock.Any(), c.Name).Return(false, nil)
-	mockRT.EXPECT().FindRunningByImage(gomock.Any(), []string{"localstack/localstack-pro", "localstack/localstack", "localstack/snowflake"}, "4566/tcp").
+	mockRT.EXPECT().FindRunningByImage(gomock.Any(), []string{"localstack/localstack-pro", "localstack/localstack", "localstack/snowflake", "localstack/localstack-azure-alpha"}, "4566/tcp").
 		Return(&runtime.RunningContainer{Name: "localstack-aws", Image: "localstack/localstack-pro:latest", BoundPort: "4566"}, nil)
 
 	var out bytes.Buffer
@@ -357,3 +357,49 @@ func TestStartContainers_SnowflakeLicenseError(t *testing.T) {
 		t.Fatal("no telemetry event received")
 	}
 }
+
+func TestStartContainers_AzureLicenseError(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	mockRT := runtime.NewMockRuntime(ctrl)
+
+	c := runtime.ContainerConfig{
+		Image:         "localstack/localstack-azure-alpha:latest",
+		Name:          "localstack-azure",
+		EmulatorType:  config.EmulatorAzure,
+		Tag:           "latest",
+		Port:          "4566",
+		ContainerPort: "4566/tcp",
+		HealthPath:    "/_localstack/health",
+	}
+	const containerID = "abc123"
+	licenseLog := "The Azure emulator is currently not covered by your license."
+	mockRT.EXPECT().Start(gomock.Any(), c).Return(containerID, nil)
+	mockRT.EXPECT().IsRunning(gomock.Any(), containerID).Return(false, nil)
+	mockRT.EXPECT().Logs(gomock.Any(), containerID, 20).Return(licenseLog, nil)
+
+	tel, capturedEvents := newCapturingTelClient(t)
+
+	var out bytes.Buffer
+	sink := output.NewPlainSink(&out)
+
+	err := startContainers(context.Background(), mockRT, sink, tel, []runtime.ContainerConfig{c}, map[string]bool{})
+	tel.Close()
+
+	require.Error(t, err)
+	assert.True(t, output.IsSilent(err), "error should be silent since ErrorEvent was already emitted")
+	got := out.String()
+	assert.Contains(t, got, "Your license does not include the Azure emulator.")
+	assert.Contains(t, got, "https://app.localstack.cloud/sign-up")
+	assert.Contains(t, got, "https://www.localstack.cloud/demo")
+
+	select {
+	case ev := <-capturedEvents:
+		payload, ok := ev["payload"].(map[string]any)
+		require.True(t, ok, "telemetry event should have a payload map")
+		assert.Equal(t, telemetry.LifecycleStartError, payload["event_type"])
+		assert.Equal(t, telemetry.ErrCodeLicenseInvalid, payload["error_code"])
+		assert.Equal(t, "azure", payload["emulator"])
+	default:
+		t.Fatal("no telemetry event received")
+	}
+}

test/integration/emulator_select_test.go

@@ -114,6 +114,60 @@ func TestFirstRunShowsEmulatorSelectionPrompt(t *testing.T) {
 	<-outputCh
 }
 
+func TestFirstRunCanSelectAzureEmulator(t *testing.T) {
+	t.Parallel()
+	if runtime.GOOS == "windows" {
+		t.Skip("PTY not supported on Windows")
+	}
+
+	tmpHome := t.TempDir()
+	require.NoError(t, os.MkdirAll(filepath.Join(tmpHome, ".config"), 0755))
+	e := env.Environ(testEnvWithHome(tmpHome, tmpHome)).
+		With(env.DisableEvents, "1")
+
+	configPath, _, err := runLstk(t, testContext(t), "", e, "config", "path")
+	require.NoError(t, err)
+	require.NoFileExists(t, configPath)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	cmd := exec.CommandContext(ctx, binaryPath(), "start")
+	cmd.Env = e
+
+	ptmx, err := pty.Start(cmd)
+	require.NoError(t, err, "failed to start lstk in PTY")
+	defer func() { _ = ptmx.Close() }()
+
+	out := &syncBuffer{}
+	outputCh := make(chan struct{})
+	go func() {
+		_, _ = io.Copy(out, ptmx)
+		close(outputCh)
+	}()
+
+	require.Eventually(t, func() bool {
+		return bytes.Contains(out.Bytes(), []byte("Which emulator would you like to use?"))
+	}, 10*time.Second, 100*time.Millisecond, "emulator selection prompt should appear on first run")
+
+	assert.Contains(t, out.String(), "Azure", "Azure should be offered as a selectable emulator")
+
+	// Press the Azure selection key ('z') instead of the default-highlighted AWS.
+	_, err = ptmx.Write([]byte("z"))
+	require.NoError(t, err)
+
+	require.Eventually(t, func() bool {
+		return bytes.Contains(out.Bytes(), []byte("Azure emulator selected."))
+	}, 10*time.Second, 100*time.Millisecond, "Azure selection confirmation should appear")
+
+	configData, err := os.ReadFile(configPath)
+	require.NoError(t, err)
+	assert.Contains(t, string(configData), `type = "azure"`)
+
+	cancel()
+	<-outputCh
+}
+
 func TestFirstRunNonInteractiveEmitsDefaultEmulatorNote(t *testing.T) {
 	t.Parallel()
 	tmpHome := t.TempDir()

test/integration/start_test.go

@@ -669,3 +669,55 @@ func TestStartCommandSucceedsForSnowflake(t *testing.T) {
 	assert.Contains(t, stdout, "> Tip:",
 		"snowflake start should print a tip line like AWS does")
 }
+
+const azureContainerName = "localstack-azure"
+
+func cleanupAzure() {
+	ctx := context.Background()
+	_, _ = dockerClient.ContainerRemove(ctx, azureContainerName, client.ContainerRemoveOptions{Force: true})
+}
+
+func writeAzureConfig(t *testing.T, hostPort string) string {
+	t.Helper()
+	content := fmt.Sprintf(`
+[[containers]]
+type = "azure"
+tag  = "latest"
+port = %q
+`, hostPort)
+	configFile := filepath.Join(t.TempDir(), "config.toml")
+	require.NoError(t, os.WriteFile(configFile, []byte(content), 0644))
+	return configFile
+}
+
+func TestStartCommandSucceedsForAzure(t *testing.T) {
+	requireDocker(t)
+	_ = env.Require(t, env.AuthToken)
+
+	cleanup()
+	cleanupAzure()
+	t.Cleanup(cleanup)
+	t.Cleanup(cleanupAzure)
+
+	mockServer := createMockLicenseServer(true)
+	defer mockServer.Close()
+
+	const hostPort = "4566"
+	configFile := writeAzureConfig(t, hostPort)
+
+	ctx := testContext(t)
+	_, stderr, err := runLstk(t, ctx, "", env.With(env.APIEndpoint, mockServer.URL), "--config", configFile, "start")
+	require.NoError(t, err, "lstk start failed: %s", stderr)
+	requireExitCode(t, 0, err)
+
+	inspect, err := dockerClient.ContainerInspect(ctx, azureContainerName, client.ContainerInspectOptions{})
+	require.NoError(t, err, "failed to inspect azure container")
+	require.True(t, inspect.Container.State.Running, "azure container should be running")
+	assert.Contains(t, inspect.Container.Config.Image, "localstack/localstack-azure-alpha",
+		"expected localstack/localstack-azure-alpha image, got %s", inspect.Container.Config.Image)
+
+	resp, err := http.Get(fmt.Sprintf("http://localhost:%s/_localstack/health", hostPort))
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = resp.Body.Close() })
+	assert.Equal(t, http.StatusOK, resp.StatusCode)
+}