[3.11] gh-84461: Fix Emscripten umask and permission issues (GH-94002) (GH-94006)

Co-authored-by: Christian Heimes <christian@python.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/Lib/test/libregrtest/main.py b/Lib/test/libregrtest/main.py
index 85bf6e1..cc8ba05 100644
--- a/Lib/test/libregrtest/main.py
+++ b/Lib/test/libregrtest/main.py
@@ -600,6 +600,16 @@ class Regrtest:
             for s in ET.tostringlist(root):
                 f.write(s)
 
+    def fix_umask(self):
+        if support.is_emscripten:
+            # Emscripten has default umask 0o777, which breaks some tests.
+            # see https://github.com/emscripten-core/emscripten/issues/17269
+            old_mask = os.umask(0)
+            if old_mask == 0o777:
+                os.umask(0o027)
+            else:
+                os.umask(old_mask)
+
     def set_temp_dir(self):
         if self.ns.tempdir:
             self.tmp_dir = self.ns.tempdir
@@ -660,6 +670,8 @@ class Regrtest:
 
         self.set_temp_dir()
 
+        self.fix_umask()
+
         if self.ns.cleanup:
             self.cleanup()
             sys.exit(0)