feat: expose runtime markers (#223)

Author: mtojek

envbuilder.go

@@ -259,11 +259,15 @@ func Run(ctx context.Context, options Options) error {
 	var (
 		buildParams *devcontainer.Compiled
 		scripts     devcontainer.LifecycleScripts
+
+		devcontainerPath string
 	)
 	if options.DockerfilePath == "" {
 		// Only look for a devcontainer if a Dockerfile wasn't specified.
 		// devcontainer is a standard, so it's reasonable to be the default.
-		devcontainerPath, devcontainerDir, err := findDevcontainerJSON(options)
+		var devcontainerDir string
+		var err error
+		devcontainerPath, devcontainerDir, err = findDevcontainerJSON(options)
 		if err != nil {
 			options.Logger(notcodersdk.LogLevelError, "Failed to locate devcontainer.json: %s", err.Error())
 			options.Logger(notcodersdk.LogLevelError, "Falling back to the default image...")
@@ -661,6 +665,13 @@ func Run(ctx context.Context, options Options) error {
 	maps.Copy(containerEnv, buildParams.ContainerEnv)
 	maps.Copy(remoteEnv, buildParams.RemoteEnv)
 
+	// Set Envbuilder runtime markers
+	containerEnv["ENVBUILDER"] = "true"
+	if devcontainerPath != "" {
+		containerEnv["DEVCONTAINER"] = "true"
+		containerEnv["DEVCONTAINER_CONFIG"] = devcontainerPath
+	}
+
 	for _, env := range []map[string]string{containerEnv, remoteEnv} {
 		envKeys := make([]string, 0, len(env))
 		for key := range env {

envbuilder_internal_test.go

@@ -27,7 +27,7 @@ func TestFindDevcontainerJSON(t *testing.T) {
 		require.Error(t, err)
 	})
 
-	t.Run("devcontainers.json is missing", func(t *testing.T) {
+	t.Run("devcontainer.json is missing", func(t *testing.T) {
 		t.Parallel()
 
 		// given

integration/integration_test.go

@@ -680,7 +680,10 @@ func TestContainerEnv(t *testing.T) {
 
 	output := execContainer(t, ctr, "cat /env")
 	require.Contains(t, strings.TrimSpace(output),
-		`FROM_CONTAINER_ENV=bar
+		`DEVCONTAINER=true
+DEVCONTAINER_CONFIG=/workspaces/empty/.devcontainer/devcontainer.json
+ENVBUILDER=true
+FROM_CONTAINER_ENV=bar
 FROM_DOCKERFILE=foo
 FROM_REMOTE_ENV=baz
 PATH=/usr/local/bin:/bin:/go/bin:/opt