Fix OSError when downloading multiple files to the same temp dir.

fsutil/__init__.py

@@ -407,7 +407,6 @@ def download_file(url, dirpath=None, filename=None, chunk_size=8192, **kwargs):
     dirpath = _get_path(dirpath)
     filename = filename or get_filename(url) or "download"
     filepath = join_path(dirpath, filename)
-    assert_not_dir(dirpath)
     make_dirs_for_file(filepath)
     kwargs["stream"] = True
     with requests.get(url, **kwargs) as response:

tests/test.py

@@ -410,6 +410,17 @@ def test_download_file(self):
         fsutil.remove_file(path)
         self.assertFalse(fsutil.exists(path))
 
+    def test_download_file_multiple_to_temp_dir(self):
+        for i in range(3):
+            url = "https://raw.githubusercontent.com/fabiocaccamo/python-fsutil/master/README.md"
+            path = fsutil.download_file(url)
+            self.assertTrue(fsutil.exists(path))
+            lines = fsutil.read_file_lines(path, skip_empty=False)
+            lines_count = len(lines)
+            self.assertTrue(lines_count > 500 and lines_count < 1000)
+            fsutil.remove_file(path)
+            self.assertFalse(fsutil.exists(path))
+
     def test_download_file_without_requests_installed(self):
         requests_installed = fsutil.requests_installed
         fsutil.requests_installed = False