离线镜像下载去掉缓存，避免缓存不完整导致空指针

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 sky22333
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -35,6 +35,8 @@ docker run -d \
 curl -fsSL https://raw.githubusercontent.com/sky22333/hubproxy/main/install-service.sh | sudo bash
 ```
 
+可直接下载二进制文件执行`./hubproxy`使用，无需配置文件即可启动，内置默认配置，支持所有功能。初始内存占用约18M，二进制文件大小约12M
+
 这个命令会：
 - 🔍 自动检测系统架构（AMD64/ARM64）
 - 📥 从 GitHub Releases 下载最新版本
@@ -52,10 +54,12 @@ curl -fsSL https://raw.githubusercontent.com/sky22333/hubproxy/main/install-serv
 docker pull nginx
 
 # 使用加速
-docker pull yourdomain.com/nginx
+docker pull demo.52013120.xyz/nginx
 
 # ghcr加速
-docker pull yourdomain.com/ghcr.io/user/images
+docker pull demo.52013120.xyz/ghcr.io/sky22333/hubproxy
+
+# 符合Docker Registry API v2标准的仓库都支持
 ```
 
 ### GitHub 文件加速

docker-compose.yml

@@ -1,5 +1,5 @@
 services:
-    ghproxy:
+    hubproxy:
         build: .
         restart: always
         ports:

src/imagetar.go

@@ -211,51 +211,8 @@ func (is *ImageStreamer) getImageDescriptor(ref name.Reference, options []remote
 
 // getImageDescriptorWithPlatform 获取指定平台的镜像描述符
 func (is *ImageStreamer) getImageDescriptorWithPlatform(ref name.Reference, options []remote.Option, platform string) (*remote.Descriptor, error) {
-	if isCacheEnabled() {
-		var reference string
-		if tagged, ok := ref.(name.Tag); ok {
-			reference = tagged.TagStr()
-		} else if digested, ok := ref.(name.Digest); ok {
-			reference = digested.DigestStr()
-		}
-		
-		if reference != "" {
-			cacheKey := buildManifestCacheKeyWithPlatform(ref.Context().String(), reference, platform)
-			if cachedItem := globalCache.Get(cacheKey); cachedItem != nil {
-				desc := &remote.Descriptor{
-					Manifest: cachedItem.Data,
-				}
-				log.Printf("使用缓存的manifest: %s (平台: %s)", ref.String(), platform)
-				return desc, nil
-			}
-		}
-	}
-
-	desc, err := remote.Get(ref, options...)
-	if err != nil {
-		return nil, err
-	}
-
-	if isCacheEnabled() {
-		var reference string
-		if tagged, ok := ref.(name.Tag); ok {
-			reference = tagged.TagStr()
-		} else if digested, ok := ref.(name.Digest); ok {
-			reference = digested.DigestStr()
-		}
-		
-		if reference != "" {
-			cacheKey := buildManifestCacheKeyWithPlatform(ref.Context().String(), reference, platform)
-			ttl := getManifestTTL(reference)
-			headers := map[string]string{
-				"Docker-Content-Digest": desc.Digest.String(),
-			}
-			globalCache.Set(cacheKey, desc.Manifest, string(desc.MediaType), headers, ttl)
-			log.Printf("缓存manifest: %s (平台: %s, TTL: %v)", ref.String(), platform, ttl)
-		}
-	}
-
-	return desc, nil
+	// 直接从网络获取完整的descriptor，确保对象完整性
+	return remote.Get(ref, options...)
 }
 
 // StreamImageToGin 流式响应到Gin
@@ -503,7 +460,7 @@ func (is *ImageStreamer) streamSingleImageForBatch(ctx context.Context, tarWrite
 
 	switch desc.MediaType {
 	case types.OCIImageIndex, types.DockerManifestList:
-		// 处理多架构镜像，复用单个下载的逻辑
+		// 处理多架构镜像
 		img, err := is.selectPlatformImage(desc, options)
 		if err != nil {
 			return nil, nil, fmt.Errorf("选择平台镜像失败: %w", err)
@@ -574,6 +531,8 @@ func (is *ImageStreamer) streamSingleImageForBatch(ctx context.Context, tarWrite
 	return manifest, repositories, nil
 }
 
+
+
 // selectPlatformImage 从多架构镜像中选择合适的平台镜像
 func (is *ImageStreamer) selectPlatformImage(desc *remote.Descriptor, options *StreamOptions) (v1.Image, error) {
 	index, err := desc.ImageIndex()