From b94fef9ddf0ccb10333ed6f92156a9ef3735cf5f Mon Sep 17 00:00:00 2001
From: Hood Chatham <roberthoodchatham@gmail.com>
Date: Tue, 17 Jun 2025 09:29:15 -0700
Subject: [PATCH 1/2] gh-127146: Emscripten: Fix pathlib glob_dotdot test

The Emscripten path resolver uses the same mechanism for resolving ..
at a file system root as for resolving symlinks. This is because
roots don't store their mountpoints. If the parent of a node is itself,
it is a root but it might be a mountpoint in some other file system.

Anyways, if a path has enough ..'s at the root, it will return ELOOP.
Enough turns out to be 49.
---
 Lib/test/test_pathlib/test_pathlib.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Lib/test/test_pathlib/test_pathlib.py b/Lib/test/test_pathlib/test_pathlib.py
index 13356b4cfe082b..7de3ba28e06aa0 100644
--- a/Lib/test/test_pathlib/test_pathlib.py
+++ b/Lib/test/test_pathlib/test_pathlib.py
@@ -2954,7 +2954,12 @@ def test_glob_dotdot(self):
         else:
             # ".." segments are normalized first on Windows, so this path is stat()able.
             self.assertEqual(set(p.glob("xyzzy/..")), { P(self.base, "xyzzy", "..") })
-        self.assertEqual(set(p.glob("/".join([".."] * 50))), { P(self.base, *[".."] * 50)})
+        if sys.platform == "emscripten":
+            # Emscripten will return ELOOP if there are 49 or more ..'s.
+            NDOTDOTS = 48
+        else:
+            NDOTDOTS = 50
+        self.assertEqual(set(p.glob("/".join([".."] * NDOTDOTS))), { P(self.base, *[".."] * NDOTDOTS)})
 
     def test_glob_inaccessible(self):
         P = self.cls

From e6c9ce3d9cf1c90812a4061b7dd064985004ad09 Mon Sep 17 00:00:00 2001
From: Hood Chatham <roberthoodchatham@gmail.com>
Date: Tue, 17 Jun 2025 10:05:32 -0700
Subject: [PATCH 2/2] Add link to fix

---
 Lib/test/test_pathlib/test_pathlib.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Lib/test/test_pathlib/test_pathlib.py b/Lib/test/test_pathlib/test_pathlib.py
index 7de3ba28e06aa0..b2e2cdb3338beb 100644
--- a/Lib/test/test_pathlib/test_pathlib.py
+++ b/Lib/test/test_pathlib/test_pathlib.py
@@ -2956,6 +2956,7 @@ def test_glob_dotdot(self):
             self.assertEqual(set(p.glob("xyzzy/..")), { P(self.base, "xyzzy", "..") })
         if sys.platform == "emscripten":
             # Emscripten will return ELOOP if there are 49 or more ..'s.
+            # Can remove when https://github.com/emscripten-core/emscripten/pull/24591 is merged.
             NDOTDOTS = 48
         else:
             NDOTDOTS = 50