From b4efdf8cda8fbbd0ca53b457d5f6e46a59348caf Mon Sep 17 00:00:00 2001
From: Barney Gale <barney.gale@gmail.com>
Date: Mon, 3 Jul 2023 21:29:44 +0100
Subject: [PATCH] GH-106330: Fix matching of empty path in
 `pathlib.PurePath.match()` (GH-106331)

We match paths using the `_lines` attribute, which is derived from the
path's string representation. The bug arises because an empty path's string
representation is `'.'` (not `''`), which is matched by the `'*'` wildcard.
---
 Lib/pathlib.py                                            | 8 ++++++--
 Lib/test/test_pathlib.py                                  | 4 ++++
 .../2023-07-02-10-56-41.gh-issue-106330.QSkIUH.rst        | 2 ++
 3 files changed, 12 insertions(+), 2 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2023-07-02-10-56-41.gh-issue-106330.QSkIUH.rst

diff --git a/Lib/pathlib.py b/Lib/pathlib.py
index e15718dc98d..f3813e04109 100644
--- a/Lib/pathlib.py
+++ b/Lib/pathlib.py
@@ -463,8 +463,12 @@ class PurePath:
         try:
             return self._lines_cached
         except AttributeError:
-            trans = _SWAP_SEP_AND_NEWLINE[self._flavour.sep]
-            self._lines_cached = str(self).translate(trans)
+            path_str = str(self)
+            if path_str == '.':
+                self._lines_cached = ''
+            else:
+                trans = _SWAP_SEP_AND_NEWLINE[self._flavour.sep]
+                self._lines_cached = path_str.translate(trans)
             return self._lines_cached
 
     def __eq__(self, other):
diff --git a/Lib/test/test_pathlib.py b/Lib/test/test_pathlib.py
index 464a835212d..eb2b0cfb26e 100644
--- a/Lib/test/test_pathlib.py
+++ b/Lib/test/test_pathlib.py
@@ -384,6 +384,10 @@ class PurePathTest(unittest.TestCase):
         self.assertTrue(P('A.py').match('a.PY', case_sensitive=False))
         self.assertFalse(P('c:/a/B.Py').match('C:/A/*.pY', case_sensitive=True))
         self.assertTrue(P('/a/b/c.py').match('/A/*/*.Py', case_sensitive=False))
+        # Matching against empty path
+        self.assertFalse(P().match('*'))
+        self.assertTrue(P().match('**'))
+        self.assertFalse(P().match('**/*'))
 
     def test_ordering_common(self):
         # Ordering is tuple-alike.
diff --git a/Misc/NEWS.d/next/Library/2023-07-02-10-56-41.gh-issue-106330.QSkIUH.rst b/Misc/NEWS.d/next/Library/2023-07-02-10-56-41.gh-issue-106330.QSkIUH.rst
new file mode 100644
index 00000000000..c1f55ab658b
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-07-02-10-56-41.gh-issue-106330.QSkIUH.rst
@@ -0,0 +1,2 @@
+Fix incorrect matching of empty paths in :meth:`pathlib.PurePath.match`.
+This bug was introduced in Python 3.12.0 beta 1.