buildMozillaMach: patch compat with python 3.12.8/3.13.1 (#363310)

pkgs/applications/networking/browsers/firefox/common.nix

@@ -279,6 +279,10 @@ buildStdenv.mkDerivation {
       url = "https://hg.mozilla.org/integration/autoland/raw-rev/23a9f6555c7c";
       hash = "sha256-CRywalJlRMFVLITEYXxpSq3jLPbUlWKNRHuKLwXqQfU=";
     })
+    # Python 3.12.8 compat
+    # https://bugzilla.mozilla.org/show_bug.cgi?id=1935621
+    # https://phabricator.services.mozilla.com/D231480
+    ./mozbz-1935621-attachment-9442305.patch
   ]
   ++ extraPatches;
 

pkgs/applications/networking/browsers/firefox/mozbz-1935621-attachment-9442305.patch

@@ -0,0 +1,119 @@
+diff --git a/python/mach/mach/site.py b/python/mach/mach/site.py
+--- a/python/mach/mach/site.py
++++ b/python/mach/mach/site.py
+@@ -15,10 +15,11 @@
+ import site
+ import subprocess
+ import sys
+ import sysconfig
+ import tempfile
++import warnings
+ from contextlib import contextmanager
+ from pathlib import Path
+ from typing import Callable, Optional
+
+ from mach.requirements import (
+@@ -817,37 +818,79 @@
+
+ class PythonVirtualenv:
+     """Calculates paths of interest for general python virtual environments"""
+
+     def __init__(self, prefix):
+-        if _is_windows:
+-            self.bin_path = os.path.join(prefix, "Scripts")
+-            self.python_path = os.path.join(self.bin_path, "python.exe")
+-        else:
+-            self.bin_path = os.path.join(prefix, "bin")
+-            self.python_path = os.path.join(self.bin_path, "python")
+         self.prefix = os.path.realpath(prefix)
++        self.paths = self._get_sysconfig_paths(self.prefix)
+
+-    @functools.lru_cache(maxsize=None)
+-    def resolve_sysconfig_packages_path(self, sysconfig_path):
+-        # macOS uses a different default sysconfig scheme based on whether it's using the
+-        # system Python or running in a virtualenv.
+-        # Manually define the scheme (following the implementation in
+-        # "sysconfig._get_default_scheme()") so that we're always following the
+-        # code path for a virtualenv directory structure.
+-        if os.name == "posix":
+-            scheme = "posix_prefix"
+-        else:
+-            scheme = os.name
++        # Name of the Python executable to use in virtual environments.
++        # An executable with the same name as sys.executable might not exist in
++        # virtual environments. An executable with 'python' as the steam —
++        # without version numbers or ABI flags — will always be present in
++        # virtual environments, so we use that.
++        python_exe_name = "python" + sysconfig.get_config_var("EXE")
++
++        self.bin_path = self.paths["scripts"]
++        self.python_path = os.path.join(self.bin_path, python_exe_name)
+
+-        sysconfig_paths = sysconfig.get_paths(scheme)
+-        data_path = Path(sysconfig_paths["data"])
+-        path = Path(sysconfig_paths[sysconfig_path])
+-        relative_path = path.relative_to(data_path)
++    @staticmethod
++    def _get_sysconfig_paths(prefix):
++        """Calculate the sysconfig paths of a virtual environment in the given prefix.
+
+-        # Path to virtualenv's "site-packages" directory for provided sysconfig path
+-        return os.path.normpath(os.path.normcase(Path(self.prefix) / relative_path))
++        The virtual environment MUST be using the same Python distribution as us.
++        """
++        # Determine the sysconfig scheme used in virtual environments
++        if "venv" in sysconfig.get_scheme_names():
++            # A 'venv' scheme was added in Python 3.11 to allow users to
++            # calculate the paths for a virtual environment, since the default
++            # scheme may not always be the same as used on virtual environments.
++            # Some common examples are the system Python distributed by macOS,
++            # Debian, and Fedora.
++            # For more information, see https://github.com/python/cpython/issues/89576
++            venv_scheme = "venv"
++        elif os.name == "nt":
++            # We know that before the 'venv' scheme was added, on Windows,
++            # the 'nt' scheme was used in virtual environments.
++            venv_scheme = "nt"
++        elif os.name == "posix":
++            # We know that before the 'venv' scheme was added, on POSIX,
++            # the 'posix_prefix' scheme was used in virtual environments.
++            venv_scheme = "posix_prefix"
++        else:
++            # This should never happen with upstream Python, as the 'venv'
++            # scheme should always be available on >=3.11, and no other
++            # platforms are supported by the upstream on older Python versions.
++            #
++            # Since the 'venv' scheme isn't available, and we have no knowledge
++            # of this platform/distribution, fallback to the default scheme.
++            #
++            # Hitting this will likely be the result of running a custom Python
++            # distribution targetting a platform that is not supported by the
++            # upstream.
++            # In this case, unless the Python vendor patched the Python
++            # distribution in such a way as the default scheme may not always be
++            # the same scheme, using the default scheme should be correct.
++            # If the vendor did patch Python as such, to work around this issue,
++            # I would recommend them to define a 'venv' scheme that matches
++            # the layout used on virtual environments in their Python distribution.
++            # (rec. signed Filipe Laíns — upstream sysconfig maintainer)
++            venv_scheme = sysconfig.get_default_scheme()
++            warnings.warn(
++                f"Unknown platform '{os.name}', using the default install scheme '{venv_scheme}'. "
++                "If this is incorrect, please ask your Python vendor to add a 'venv' sysconfig scheme "
++                "(see https://github.com/python/cpython/issues/89576, or check the code comment).",
++                stacklevel=2,
++            )
++        # Build the sysconfig config_vars dictionary for the virtual environment.
++        venv_vars = sysconfig.get_config_vars().copy()
++        venv_vars["base"] = venv_vars["platbase"] = prefix
++        # Get sysconfig paths for the virtual environment.
++        return sysconfig.get_paths(venv_scheme, vars=venv_vars)
++
++    def resolve_sysconfig_packages_path(self, sysconfig_path):
++        return self.paths[sysconfig_path]
+
+     def site_packages_dirs(self):
+         dirs = []
+         if sys.platform.startswith("win"):
+             dirs.append(os.path.normpath(os.path.normcase(self.prefix)))
+