avoid isfile calls on find as much as possible

fsspec/asyn.py

@@ -581,7 +581,7 @@ async def _find(self, path, maxdepth=None, withdirs=False, **kwargs):
             if withdirs:
                 files.update(dirs)
             out.update({info["name"]: info for name, info in files.items()})
-        if (await self._isfile(path)) and path not in out:
+        if not out and (await self._isfile(path)):
             # walk works on directories, but find should also return [path]
             # when path happens to be a file
             out[path] = {}

fsspec/spec.py

@@ -445,7 +445,7 @@ def find(self, path, maxdepth=None, withdirs=False, **kwargs):
             if withdirs:
                 files.update(dirs)
             out.update({info["name"]: info for name, info in files.items()})
-        if self.isfile(path) and path not in out:
+        if not out and self.isfile(path):
             # walk works on directories, but find should also return [path]
             # when path happens to be a file
             out[path] = {}

fsspec/tests/test_spec.py

@@ -232,6 +232,14 @@ def test_find_details():
         assert details[filename] == test_fs.info(filename)
 
 
+def test_find_file():
+    test_fs = DummyTestFS()
+
+    filename = "misc/foo.txt"
+    assert test_fs.find(filename) == [filename]
+    assert test_fs.find(filename, detail=True) == {filename: {}}
+
+
 def test_cache():
     fs = DummyTestFS()
     fs2 = DummyTestFS()