gh-154218: Fix test_posix_fallocate on file systems that do not support posix_fallocate() (GH-154219)

https://github.com/python/cpython/commit/051b6e07f9e43980d99c563d67bea32144238461
commit: 051b6e07f9e43980d99c563d67bea32144238461
branch: main
author: Serhiy Storchaka <[email protected]>
committer: serhiy-storchaka <[email protected]>
date: 2026-07-20T08:11:53Z
summary:

gh-154218: Fix test_posix_fallocate on file systems that do not support posix_fallocate() (GH-154219)

Co-authored-by: Claude Fable 5 <[email protected]>

files:
M Lib/test/test_os/test_posix.py

diff --git a/Lib/test/test_os/test_posix.py b/Lib/test/test_os/test_posix.py
index 8e83fa21dae6e2..79e234cbcd2ae2 100644
--- a/Lib/test/test_os/test_posix.py
+++ b/Lib/test/test_os/test_posix.py
@@ -415,8 +415,10 @@ def test_posix_fallocate(self):
             if inst.errno == errno.EINVAL and sys.platform.startswith(
                 ('sunos', 'freebsd', 'openbsd', 'gnukfreebsd')):
                 raise unittest.SkipTest("test may fail on ZFS filesystems")
-            elif inst.errno == errno.EOPNOTSUPP and sys.platform.startswith("netbsd"):
-                raise unittest.SkipTest("test may fail on FFS filesystems")
+            elif inst.errno == errno.EOPNOTSUPP:
+                # ZFS on FreeBSD, FFS on NetBSD, etc.
+                raise unittest.SkipTest(
+                    "the file system does not support posix_fallocate()")
             else:
                 raise
         finally:

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