bpo-39460: Fix test_zipfile.test_add_file_after_2107() (GH-18247)
XFS filesystem is limited to 32-bit timestamp, but the utimensat()
syscall doesn't fail. Moreover, there is a VFS bug which returns
a cached timestamp which is different than the value on disk.
https://bugzilla.redhat.com/show_bug.cgi?id=1795576
https://bugs.python.org/issue39460#msg360952
diff --git a/Lib/test/test_zipfile.py b/Lib/test/test_zipfile.py
index 66f05ac..4c20bfd 100644
--- a/Lib/test/test_zipfile.py
+++ b/Lib/test/test_zipfile.py
@@ -616,6 +616,18 @@
except OverflowError:
self.skipTest('Host fs cannot set timestamp to required value.')
+ mtime_ns = os.stat(TESTFN).st_mtime_ns
+ if mtime_ns != (4386268800 * 10**9):
+ # XFS filesystem is limited to 32-bit timestamp, but the syscall
+ # didn't fail. Moreover, there is a VFS bug which returns
+ # a cached timestamp which is different than the value on disk.
+ #
+ # Test st_mtime_ns rather than st_mtime to avoid rounding issues.
+ #
+ # https://bugzilla.redhat.com/show_bug.cgi?id=1795576
+ # https://bugs.python.org/issue39460#msg360952
+ self.skipTest(f"Linux VFS/XFS kernel bug detected: {mtime_ns=}")
+
with zipfile.ZipFile(TESTFN2, "w") as zipfp:
self.assertRaises(struct.error, zipfp.write, TESTFN)