Dec 21, 2023 · Dec 21, 2023 · Dec 21, 2023 · Dec 21, 2023 · Dec 24, 2023
diff --git a/Lib/site.py b/Lib/site.py
    except OSError:
        return
    with f:
        if name.startswith("._"):
            # MacOS will create "._" files next to a regular file
            # when a filesystem driver needs to store metadata that
            # cannot be stored natively. Such files are encoded
            # in AppleDouble format.
            # The test looks for the magic marker at the start of such
            # files.
            if f.buffer.read(4) == b"\x00\x05\x16\x07" \
               and os.path.exists(os.path.join(sitedir, name[2:])):
                    return
            f.seek(0)

        for n, line in enumerate(f):
            if line.startswith("#"):
                continue
diff --git a/Lib/test/test_site.py b/Lib/test/test_site.py
            if isinstance(path, str):
                self.assertNotIn("abc\x00def", path)

    def test_addpackage_macOS_resources(self):
        # GH-113356
        pth_dir, pth_fn = self.make_pth("dummy\n")
        resource_fork = os.path.join(pth_dir, "._" + pth_fn)
        with open(resource_fork, "wb") as fp:
            self.addCleanup(lambda: os.remove(resource_fork))

            # The bytes below were generated on macOS 14 using an
            # exFAT filesystem. Command to write an xattr:
            # `xattr -w key value test.txt`. These bytes are not
            # the complete AppleDouble file, but just a significant
            # prefix.
            fp.write(b'\x00\x05\x16\x07\x00\x02\x00\x00Mac OS X        ')
            fp.write(b'\x00\x02\x00\x00\x00\t\x00\x00\x002\x00\x00\x0e')
            fp.write(b'\xb0\x00\x00\x00\x02\x00\x00\x0e\xe2\x00\x00')
            fp.write(b'\x01\x1e')

        with captured_stderr() as err_out:
            self.assertFalse(site.addpackage(pth_dir, "._" + pth_fn, set()))
        self.assertEqual(err_out.getvalue(), "")

    def test_addsitedir(self):
        # Same tests for test_addpackage since addsitedir() essentially just
        # calls addpackage() for every .pth file in the directory
diff --git a/Misc/NEWS.d/next/macOS/2023-12-21-14-18-24.gh-issue-113356.Vz2osH.rst b/Misc/NEWS.d/next/macOS/2023-12-21-14-18-24.gh-issue-113356.Vz2osH.rst
 Ignore "._" prefixed pth files when those cannot be parsed. These files are
 created on macOS when the system tries store metadata that is not supported
 by the filesystem (such as extended attributes on exFAT)
Original file line number	Diff line number	Diff line change
Expand Up		@@ -176,6 +176,18 @@ def addpackage(sitedir, name, known_paths):
		except OSError:
		return
		with f:
		if name.startswith("._"):
		# MacOS will create "._" files next to a regular file
		# when a filesystem driver needs to store metadata that
		# cannot be stored natively. Such files are encoded
		# in AppleDouble format.
		# The test looks for the magic marker at the start of such
		# files.
		if f.buffer.read(4) == b"\x00\x05\x16\x07" \
		and os.path.exists(os.path.join(sitedir, name[2:])):
		return
		f.seek(0)

		for n, line in enumerate(f):
		if line.startswith("#"):
		continue
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -181,6 +181,27 @@ def test_addpackage_import_bad_pth_file(self):
		if isinstance(path, str):
		self.assertNotIn("abc\x00def", path)

		def test_addpackage_macOS_resources(self):
		# GH-113356
		pth_dir, pth_fn = self.make_pth("dummy\n")
		resource_fork = os.path.join(pth_dir, "._" + pth_fn)
		with open(resource_fork, "wb") as fp:
		self.addCleanup(lambda: os.remove(resource_fork))

		# The bytes below were generated on macOS 14 using an
		# exFAT filesystem. Command to write an xattr:
		# `xattr -w key value test.txt`. These bytes are not
		# the complete AppleDouble file, but just a significant
		# prefix.
		fp.write(b'\x00\x05\x16\x07\x00\x02\x00\x00Mac OS X ')
		fp.write(b'\x00\x02\x00\x00\x00\t\x00\x00\x002\x00\x00\x0e')
		fp.write(b'\xb0\x00\x00\x00\x02\x00\x00\x0e\xe2\x00\x00')
		fp.write(b'\x01\x1e')

		with captured_stderr() as err_out:
		self.assertFalse(site.addpackage(pth_dir, "._" + pth_fn, set()))
		self.assertEqual(err_out.getvalue(), "")

		def test_addsitedir(self):
		# Same tests for test_addpackage since addsitedir() essentially just
		# calls addpackage() for every .pth file in the directory
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		Ignore "._" prefixed pth files when those cannot be parsed. These files are
		created on macOS when the system tries store metadata that is not supported
		by the filesystem (such as extended attributes on exFAT)