修复潜在BUG

src/imagetar.go

@@ -106,7 +106,6 @@ func (is *ImageStreamer) getImageDescriptor(ref name.Reference, options []remote
 					if cachedItem := globalCache.Get(cacheKey); cachedItem != nil {
 			desc := &remote.Descriptor{
 				Manifest: cachedItem.Data,
-					MediaType: types.MediaType(cachedItem.ContentType),
 			}
 			log.Printf("使用缓存的manifest: %s", ref.String())
 			return desc, nil
@@ -278,6 +277,7 @@ func (is *ImageStreamer) streamDockerFormat(ctx context.Context, tarWriter *tar.
 		default:
 		}
 
+		if err := func() error { // ✅ 匿名函数确保资源立即释放
 			digest, err := layer.Digest()
 			if err != nil {
 				return err
@@ -299,7 +299,7 @@ func (is *ImageStreamer) streamDockerFormat(ctx context.Context, tarWriter *tar.
 			if err != nil {
 				return err
 			}
-		defer layerReader.Close()
+			defer layerReader.Close() // ✅ 函数结束立即释放
 
 			size, err := layer.Size()
 			if err != nil {
@@ -320,6 +320,11 @@ func (is *ImageStreamer) streamDockerFormat(ctx context.Context, tarWriter *tar.
 				return err
 			}
 
+			return nil
+		}(); err != nil {
+			return err
+		}
+
 		log.Printf("已处理层 %d/%d", i+1, len(layers))
 	}
 
@@ -394,7 +399,7 @@ func handleDirectImageDownload(c *gin.Context) {
 
 	imageRef := strings.ReplaceAll(imageParam, "_", "/")
 	platform := c.Query("platform")
-	tag := c.DefaultQuery("tag")
+	tag := c.DefaultQuery("tag", "")
 
 	if tag != "" && !strings.Contains(imageRef, ":") && !strings.Contains(imageRef, "@") {
 		imageRef = imageRef + ":" + tag