gh-94315: Check for DAC override capability (GH-94316)

``os.geteuid() == 0`` is not a reliable check whether the current user
has the capability to bypass permission checks. Tests now probe for DAC
override.

1 files changed, 5 insertions, 8 deletions

diff --git a/Lib/test/test_argparse.py b/Lib/test/test_argparse.py
index 673ef89..425b6bb 100644
--- a/Lib/test/test_argparse.py
+++ b/Lib/test/test_argparse.py
@@ -1734,8 +1734,7 @@ class WFile(object):
         return self.name == other.name
 
 
-@unittest.skipIf(hasattr(os, 'geteuid') and os.geteuid() == 0,
-                 "non-root user required")
+@os_helper.skip_if_dac_override
 class TestFileTypeW(TempDirMixin, ParserTestCase):
     """Test the FileType option/argument type for writing files"""
 
@@ -1757,8 +1756,8 @@ class TestFileTypeW(TempDirMixin, ParserTestCase):
         ('-x - -', NS(x=eq_stdout, spam=eq_stdout)),
     ]
 
-@unittest.skipIf(hasattr(os, 'geteuid') and os.geteuid() == 0,
-                 "non-root user required")
+
+@os_helper.skip_if_dac_override
 class TestFileTypeX(TempDirMixin, ParserTestCase):
     """Test the FileType option/argument type for writing new files only"""
 
@@ -1778,8 +1777,7 @@ class TestFileTypeX(TempDirMixin, ParserTestCase):
     ]
 
 
-@unittest.skipIf(hasattr(os, 'geteuid') and os.geteuid() == 0,
-                 "non-root user required")
+@os_helper.skip_if_dac_override
 class TestFileTypeWB(TempDirMixin, ParserTestCase):
     """Test the FileType option/argument type for writing binary files"""
 
@@ -1796,8 +1794,7 @@ class TestFileTypeWB(TempDirMixin, ParserTestCase):
     ]
 
 
-@unittest.skipIf(hasattr(os, 'geteuid') and os.geteuid() == 0,
-                 "non-root user required")
+@os_helper.skip_if_dac_override
 class TestFileTypeXB(TestFileTypeX):
     "Test the FileType option/argument type for writing new binary files only"