Fix a corner case when open() fails w/ NXIO/OPNOTSUPP on reg file

Closes: https://github.com/projg2/gemato/issues/21
Signed-off-by: Michał Górny <mgorny@gentoo.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/test_verify.py b/tests/test_verify.py
index 8890e1a..0c3fba9 100644
--- a/tests/test_verify.py
+++ b/tests/test_verify.py
@@ -4,11 +4,13 @@
 # Licensed under the terms of 2-clause BSD license
 
 import contextlib
+import errno
 import itertools
 import os
 import os.path
 import socket
 import stat
+import unittest.mock
 
 import pytest
 
@@ -560,3 +562,11 @@ def test_entry_compatibility(a_cls, a_name, a_args, b_cls, b_name,
     e1 = new_manifest_entry(a_cls, a_name, *a_args)
     e2 = new_manifest_entry(b_cls, b_name, *b_args)
     assert verify_entry_compatibility(e1, e2) == (expected, diff)
+
+
+def test_get_file_metadata_fail_to_open_reg(test_tree):
+    """Regression test for when open() fails on a seemingly regular file"""
+    with unittest.mock.patch("os.open") as mock_open:
+        mock_open.side_effect = OSError(errno.ENXIO, "mocked error")
+        with pytest.raises(OSError):
+            list(get_file_metadata(test_tree / "regular-file", {}))