lfs: expose fsspec batch_size for fetch operations

src/scmrepo/git/lfs/client.py

@@ -3,7 +3,6 @@
 import shutil
 from collections.abc import Iterable, Iterator
 from contextlib import AbstractContextManager, contextmanager, suppress
-from multiprocessing import cpu_count
 from tempfile import NamedTemporaryFile
 from typing import TYPE_CHECKING, Any, Optional
 
@@ -32,7 +31,6 @@ class LFSClient(AbstractContextManager):
 
     JSON_CONTENT_TYPE = "application/vnd.git-lfs+json"
 
-    _JOBS = 4 * cpu_count()
     _REQUEST_TIMEOUT = 60
     _SESSION_RETRIES = 5
     _SESSION_BACKOFF_FACTOR = 0.1
@@ -154,6 +152,7 @@ async def _download(
         storage: "LFSStorage",
         objects: Iterable[Pointer],
         callback: "Callback" = DEFAULT_CALLBACK,
+        batch_size: Optional[int] = None,
         **kwargs,
     ):
         async def _get_one(from_path: str, to_path: str, **kwargs):
@@ -179,7 +178,7 @@ async def _get_one(from_path: str, to_path: str, **kwargs):
             to_path = storage.oid_to_path(obj.oid)
             coros.append(_get_one(url, to_path, headers=headers))
         for result in await _run_coros_in_chunks(
-            coros, batch_size=self._JOBS, return_exceptions=True
+            coros, batch_size=batch_size, return_exceptions=True
         ):
             if isinstance(result, BaseException):
                 raise result

src/scmrepo/git/lfs/smudge.py

@@ -11,7 +11,10 @@
 
 
 def smudge(
-    storage: "LFSStorage", fobj: BinaryIO, url: Optional[str] = None
+    storage: "LFSStorage",
+    fobj: BinaryIO,
+    url: Optional[str] = None,
+    batch_size: Optional[int] = None,
 ) -> BinaryIO:
     """Wrap the specified binary IO stream and run LFS smudge if necessary."""
     reader = io.BufferedReader(fobj)  # type: ignore[arg-type]

src/scmrepo/git/lfs/storage.py

@@ -20,13 +20,14 @@ def fetch(
         url: str,
         objects: Collection[Pointer],
         progress: Optional[Callable[["GitProgressEvent"], None]] = None,
+        batch_size: Optional[int] = None,
     ):
         from .client import LFSClient
 
         with LFSCallback.as_lfs_callback(progress) as cb:
             cb.set_size(len(objects))
             with LFSClient.from_git_url(url) as client:
-                client.download(self, objects, callback=cb)
+                client.download(self, objects, callback=cb, batch_size=batch_size)
 
     def oid_to_path(self, oid: str):
         return os.path.join(self.path, "objects", oid[0:2], oid[2:4], oid)
@@ -40,6 +41,7 @@ def open(
         self,
         obj: Union[Pointer, str],
         fetch_url: Optional[str] = None,
+        batch_size: Optional[int] = None,
         **kwargs,
     ) -> BinaryIO:
         oid = obj if isinstance(obj, str) else obj.oid
@@ -50,7 +52,7 @@ def open(
             if not fetch_url or not isinstance(obj, Pointer):
                 raise
         try:
-            self.fetch(fetch_url, [obj])
+            self.fetch(fetch_url, [obj], batch_size=batch_size)
         except BaseException as exc:  # noqa: BLE001
             raise FileNotFoundError(
                 errno.ENOENT, os.strerror(errno.ENOENT), path