From cffb15fa2a6ced2597661a4b0ab0e6f20c40221b Mon Sep 17 00:00:00 2001
From: Claudio Cacciari <claudio.cacciari@surf.nl>
Date: Sun, 11 Oct 2026 15:02:28 +0200
Subject: [PATCH 1/2] fix(fsspec): keep last_modified and version in ls()
 detail entries

---
 obstore/python/obstore/fsspec.py |  2 ++
 tests/test_fsspec.py             | 26 ++++++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/obstore/python/obstore/fsspec.py b/obstore/python/obstore/fsspec.py
index 277fb6d1..86e37a49 100644
--- a/obstore/python/obstore/fsspec.py
+++ b/obstore/python/obstore/fsspec.py
@@ -571,6 +571,8 @@ async def _ls(
                 "size": obj["size"],
                 "type": "file",
                 "e_tag": obj["e_tag"],
+                "last_modified": obj["last_modified"],
+                "version": obj["version"],
             }
             for obj in objects
         ] + [
diff --git a/tests/test_fsspec.py b/tests/test_fsspec.py
index 8bf490ef..66a3861c 100644
--- a/tests/test_fsspec.py
+++ b/tests/test_fsspec.py
@@ -3,6 +3,7 @@
 import gc
 import os
 import zipfile
+from datetime import datetime
 from io import UnsupportedOperation
 from pathlib import Path
 from tempfile import TemporaryDirectory
@@ -417,6 +418,31 @@ def test_list(
     assert types.get(f"{bucket}/dir") == "directory"
 
 
+def test_list_detail_matches_info(
+    minio_bucket: tuple[S3Config, ClientConfig],
+):
+    bucket = minio_bucket[0].get("bucket")
+    assert bucket is not None
+
+    register("s3")
+    fs = fsspec.filesystem(
+        "s3",
+        config=minio_bucket[0],
+        client_options=minio_bucket[1],
+    )
+
+    fs.pipe_file(f"{bucket}/afile", b"hello world")
+
+    out = fs.ls(f"{bucket}", detail=True, refresh=True)
+    entry = next(o for o in out if o["name"] == f"{bucket}/afile")
+    # Without the listing in the cache, info() asks the store itself (HEAD).
+    fs.invalidate_cache()
+    info = fs.info(f"{bucket}/afile")
+    assert isinstance(entry["last_modified"], datetime)
+    assert entry["last_modified"] == info["last_modified"]
+    assert entry["version"] == info["version"]
+
+
 @pytest.mark.asyncio
 async def test_list_async(
     minio_bucket: tuple[S3Config, ClientConfig],

From f836b32785c929d4301c9ae825177578b408f336 Mon Sep 17 00:00:00 2001
From: Claudio Cacciari <claudio.cacciari@surf.nl>
Date: Sun, 11 Oct 2026 15:11:44 +0200
Subject: [PATCH 2/2] test: compare last_modified to within a second

---
 tests/test_fsspec.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tests/test_fsspec.py b/tests/test_fsspec.py
index 66a3861c..ee99c3f3 100644
--- a/tests/test_fsspec.py
+++ b/tests/test_fsspec.py
@@ -3,7 +3,7 @@
 import gc
 import os
 import zipfile
-from datetime import datetime
+from datetime import datetime, timedelta
 from io import UnsupportedOperation
 from pathlib import Path
 from tempfile import TemporaryDirectory
@@ -439,7 +439,8 @@ def test_list_detail_matches_info(
     fs.invalidate_cache()
     info = fs.info(f"{bucket}/afile")
     assert isinstance(entry["last_modified"], datetime)
-    assert entry["last_modified"] == info["last_modified"]
+    # A listing reports milliseconds; HEAD's Last-Modified header whole seconds.
+    assert abs(entry["last_modified"] - info["last_modified"]) < timedelta(seconds=1)
     assert entry["version"] == info["version"]