feature: now check handling error and fixed docs accordingly

changes/1803.feature.md

@@ -1 +1 @@
-Add support for multi directory mkdir and fix type annotation accordingly
+Add support for multi directory mkdir by fixing cli to accept multiple arguments and by adding list type annotation to accept multiple directories

src/ai/backend/storage/api/manager.py

@@ -790,7 +790,20 @@ class Params(TypedDict):
                     volume.mkdir(vfid, rpath, parents=parents, exist_ok=exist_ok)
                     for rpath in relpaths
                 ]
-                await asyncio.gather(*mkdir_tasks)
+                result_group = await asyncio.gather(*mkdir_tasks, return_exceptions=True)
+
+                # if result group is all false throw error.
+                if all([isinstance(res, FileExistsError) for res in result_group]):
+                    raise FileExistsError("None of directories created because they already exist")
+
+                for result_or_exception in result_group:
+                    if isinstance(result_or_exception, BaseException):
+                        log.error(
+                            "%s",
+                            repr(result_or_exception),
+                            exc_info=result_or_exception,
+                        )
+
         return web.Response(status=204)