fix

pkg/backofficeadmin/app.go

@@ -51,6 +51,8 @@ type Config struct {
 	CheckoutDataDir string
 	// ProfileDataDir holds the profile event logs (optional, default "" — customer endpoints disabled).
 	ProfileDataDir string
+	// PromotionsFile holds the path to promotions.json (optional).
+	PromotionsFile string
 }
 
 // App is the commerce admin control plane. Construct with New, register its
@@ -78,7 +80,10 @@ func New(cfg Config) (*App, error) {
 	_ = os.MkdirAll(cfg.DataDir, 0755)
 	reg := cart.NewCartMultationRegistry(cart.NewCartMutationContext(nil))
 
-	promotionsPath := os.Getenv("PROMOTIONS_FILE")
+	promotionsPath := cfg.PromotionsFile
+	if promotionsPath == "" {
+		promotionsPath = os.Getenv("PROMOTIONS_FILE")
+	}
 	if promotionsPath == "" {
 		promotionsPath = "data/promotions.json"
 	}
@@ -156,7 +161,7 @@ func New(cfg Config) (*App, error) {
 	}
 
 	return &App{
-		fs:  NewFileServer(cfg.DataDir, cfg.CheckoutDataDir, diskStorage, diskStorageCheckout),
+		fs:  NewFileServer(cfg.DataDir, cfg.CheckoutDataDir, promotionsPath, diskStorage, diskStorageCheckout),
 		hub: NewHub(),
 		cs:  customerSrv,
 	}, nil

pkg/backofficeadmin/fileserver.go

@@ -26,14 +26,16 @@ type FileServer struct {
 	// Define fields here
 	dataDir         string
 	checkoutDataDir string
+	promotionsFile  string
 	storage         actor.LogStorage[cart.CartGrain]
 	checkoutStorage actor.LogStorage[checkout.CheckoutGrain]
 }
 
-func NewFileServer(dataDir string, checkoutDataDir string, storage actor.LogStorage[cart.CartGrain], checkoutStorage actor.LogStorage[checkout.CheckoutGrain]) *FileServer {
+func NewFileServer(dataDir string, checkoutDataDir string, promotionsFile string, storage actor.LogStorage[cart.CartGrain], checkoutStorage actor.LogStorage[checkout.CheckoutGrain]) *FileServer {
 	return &FileServer{
 		dataDir:         dataDir,
 		checkoutDataDir: checkoutDataDir,
+		promotionsFile:  promotionsFile,
 		storage:         storage,
 		checkoutStorage: checkoutStorage,
 	}
@@ -215,7 +217,10 @@ func (fs *FileServer) CheckoutsHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func (fs *FileServer) PromotionsHandler(w http.ResponseWriter, r *http.Request) {
-	fileName := filepath.Join(fs.dataDir, "promotions.json")
+	fileName := fs.promotionsFile
+	if fileName == "" {
+		fileName = filepath.Join(fs.dataDir, "promotions.json")
+	}
 	if r.Method == http.MethodGet {
 		file, err := os.Open(fileName)
 		if err != nil {