gh-81325: Support path-like objects with streaming TarFile (#137188)

Co-authored-by: Emma Smith <emma@emmatyping.dev>

Lib/tarfile.py

@@ -353,7 +353,7 @@ class _Stream:
             fileobj = _StreamProxy(fileobj)
             comptype = fileobj.getcomptype()
 
-        self.name     = name or ""
+        self.name     = os.fspath(name) if name is not None else ""
         self.mode     = mode
         self.comptype = comptype
         self.fileobj  = fileobj

Lib/test/test_tarfile.py

@@ -1737,6 +1737,16 @@ class StreamWriteTest(WriteTestBase, unittest.TestCase):
         finally:
             os.umask(original_umask)
 
+    def test_pathlike_name(self):
+        expected_name = os.path.abspath(tmpname)
+        tarpath = os_helper.FakePath(tmpname)
+
+        for func in (tarfile.open, tarfile.TarFile.open):
+            with self.subTest():
+                with func(tarpath, self.mode) as tar:
+                    self.assertEqual(tar.name, expected_name)
+                os_helper.unlink(tmpname)
+
 
 class GzipStreamWriteTest(GzipTest, StreamWriteTest):
     def test_source_directory_not_leaked(self):

Misc/NEWS.d/next/Library/2025-07-28-23-11-29.gh-issue-81325.jMJFBe.rst

@@ -0,0 +1,2 @@
+:class:`tarfile.TarFile` now accepts a :term:`path-like <path-like object>` when working on a tar archive.
+(Contributed by Alexander Enrique Urieles Nieto in :gh:`81325`.)