fix e2e

Author: mjudeikis

pkg/server/localproxy.go

@@ -215,14 +215,17 @@ func WithLocalProxy(
 // If we want to re-use that code, we basically would be merging proxy with server packages.
 // Which is not desirable at the point of writing (2024.10-26), but might be in the future.
 func NewLocalProxyHandler(defaultHandler http.Handler, index index.Index, additionalMappingsFile string) (http.Handler, error) {
-	mappingData, err := os.ReadFile(additionalMappingsFile)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read mapping file %q: %w", additionalMappingsFile, err)
-	}
-
 	var mapping []proxy.PathMapping
-	if err = yaml.Unmarshal(mappingData, &mapping); err != nil {
-		return nil, fmt.Errorf("failed to unmarshal mapping file %q: %w", additionalMappingsFile, err)
+	if additionalMappingsFile != "" {
+		mappingData, err := os.ReadFile(additionalMappingsFile)
+		if err != nil {
+			return nil, fmt.Errorf("failed to read mapping file %q: %w", additionalMappingsFile, err)
+		}
+
+		var mapping []proxy.PathMapping
+		if err = yaml.Unmarshal(mappingData, &mapping); err != nil {
+			return nil, fmt.Errorf("failed to unmarshal mapping file %q: %w", additionalMappingsFile, err)
+		}
 	}
 
 	handlers := proxy.HttpHandler{