exact single file bundle

assets-updater/src/core/asset_execution.rs

@@ -157,7 +157,7 @@ impl AssetExecutionContext {
         &self,
         task: &DownloadTask,
         app_config: &AppConfig,
-    ) -> Result<PathBuf, AssetExecutionError> {
+    ) -> Result<(PathBuf, /*single file*/ bool), AssetExecutionError> {
         let ctx = self.clone();
         ctx.download_and_export_bundle(app_config, task).await
     }
@@ -400,7 +400,7 @@ impl AssetExecutionContext {
         &self,
         app_config: &AppConfig,
         task: &DownloadTask,
-    ) -> Result<PathBuf, AssetExecutionError> {
+    ) -> Result<(PathBuf, bool), AssetExecutionError> {
         let bundle_url = self.render_bundle_url(task)?;
         let body = self.get_with_retry(&bundle_url).await?;
         let deobfuscated = deobfuscate(&body);

assets-updater/src/core/export_pipeline.rs

@@ -61,13 +61,13 @@ pub async fn extract_unity_asset_bundle(
     asset_bundle_file: &Path,
     export_path: &str,
     category: &str,
-) -> Result<PathBuf, ExportPipelineError> {
+) -> Result<(PathBuf, bool), ExportPipelineError> {
     let output_dir = std::env::temp_dir()
         .join("sekai-updater")
         .join("extract")
         .join(&sync_context.region);
     let Some(asset_studio_cli_path) = app_config.tools.asset_studio_cli_path.as_deref() else {
-        return Ok(asset_bundle_file.parent().unwrap().to_path_buf());
+        return Ok((asset_bundle_file.parent().unwrap().to_path_buf(), true));
     };
 
     let exclude_path_prefix = if sync_context.export.by_category {
@@ -125,8 +125,11 @@ pub async fn extract_unity_asset_bundle(
     )
     .await?;
 
+    let mut count = 0;
+    walk(&actual_export_path, &mut |_| count += 1)?;
+
     post_process_exported_files(app_config, sync_context, region, &actual_export_path).await?;
-    Ok(actual_export_path)
+    Ok((actual_export_path, count <= 1))
 }
 
 pub async fn post_process_exported_files(