feat: support access function for custom fs provider (#4496)

* feat: support access function for custom fs provider

* fix: ensure context key initialization in file tree component

---------

Co-authored-by: liuqian <[email protected]>

Author: erha19

packages/file-service/src/browser/file-service-client.ts

@@ -511,6 +511,15 @@ export class FileServiceClient implements IFileServiceClient, IDisposable {
     const provider = await this.getProvider(_uri.scheme);
 
     if (!containsExtraFileMethod(provider, 'access')) {
+      if (mode === FileAccess.Constants.F_OK) {
+        // 当 mode 为 F_OK 时，如果 provider 不支持 access 方法，则使用 stat 方法判断文件是否存在
+        try {
+          const stat = await provider.stat(_uri.codeUri);
+          return !!stat;
+        } catch (error) {
+          return false;
+        }
+      }
       throw this.getErrorProvideNotSupport(_uri.scheme, 'access');
     }
 

packages/file-tree-next/src/browser/file-tree.tsx

@@ -146,12 +146,16 @@ export const FileTree = ({ viewState }: PropsWithChildren<{ viewState: ViewState
         if (treeModel) {
           // 确保数据初始化完毕，减少初始化数据过程中多次刷新视图
           await treeModel.ensureReady;
+
+          if (wrapperRef.current) {
+            fileTreeService.initContextKey(wrapperRef.current);
+          }
         }
         setModel(treeModel);
         setIsLoading(false);
       });
     }
-  }, [isReady]);
+  }, [isReady, wrapperRef.current, fileTreeService]);
 
   useEffect(() => {
     const tokenSource = new CancellationTokenSource();