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#!/usr/bin/env python3
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
import os
import platform
import sys
import subprocess
from textwrap import dedent
MIN_PYTHON_VERSION = (3, 7)
MAX_PYTHON_VERSION_TO_CONSIDER = (3, 11)
def load_mach(dir_path, mach_path):
# Defer import of "importlib.util" until after Python version check has happened
# so that Python 2 usages fail gracefully.
import importlib.util
spec = importlib.util.spec_from_file_location('mach_initialize', mach_path)
mach_initialize = importlib.util.module_from_spec(spec)
spec.loader.exec_module(mach_initialize)
return mach_initialize.initialize(dir_path)
def check_and_get_mach(dir_path):
initialize_paths = (
# Run Thunderbird's mach_initialize.py if it exists
'comm/build/mach_initialize.py',
'build/mach_initialize.py',
# test package initialize
'tools/mach_initialize.py',
)
for initialize_path in initialize_paths:
mach_path = os.path.join(dir_path, initialize_path)
if os.path.isfile(mach_path):
return load_mach(dir_path, mach_path)
return None
def try_alternate_python3_executables(args):
for i in range(MIN_PYTHON_VERSION[1], MAX_PYTHON_VERSION_TO_CONSIDER[1] + 1):
try:
potential_python_binary = f"python3.{i}"
if os.name == 'nt':
potential_python_binary += ".exe"
out = subprocess.run(
[potential_python_binary, "--version"],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
encoding="UTF-8")
binary_minor_version = int(out.stdout[9:11].strip("."))
if binary_minor_version >= MIN_PYTHON_VERSION[1]:
print(f"We found '{potential_python_binary}' and will attempt to re-run Mach with it.")
os.execvp(potential_python_binary, [potential_python_binary] + ["mach"] + args)
except Exception:
# We don't really care what goes wrong, just don't let it bubble up
# If we can't successfully launch with a different python3 binary
# we will just print the normal help messages.
pass
def main(args):
# Ensure we are running Python 3.7+. We run this check as soon as
# possible to avoid a cryptic import/usage error.
if sys.version_info < MIN_PYTHON_VERSION:
print(f"Python {MIN_PYTHON_VERSION[0]}.{MIN_PYTHON_VERSION[1]}+ is required to run mach.")
print("You are running Mach with Python {0}".format(platform.python_version()))
try_alternate_python3_executables(args)
if sys.platform.startswith("linux"):
print(dedent("""
See https://firefox-source-docs.mozilla.org/setup/linux_build.html#installingpython
for guidance on how to install Python on your system.
""").strip())
elif sys.platform.startswith("darwin"):
print(dedent("""
See https://firefox-source-docs.mozilla.org/setup/macos_build.html
for guidance on how to prepare your system to build Firefox. Perhaps
you need to update Xcode, or install Python using brew?
""").strip())
elif "MOZILLABUILD" in os.environ and os.environ.get("TERM"):
print(dedent("""
Python is provided by MozillaBuild; ensure your MozillaBuild installation is
up to date. See https://firefox-source-docs.mozilla.org/setup/windows_build.html#install-mozillabuild
for details.
""").strip())
elif sys.platform.startswith("win"):
print(dedent("""
You probably want to be interacting with Mach from within MozillaBuild, see
https://firefox-source-docs.mozilla.org/setup/windows_build.html for details.
If you are deliberately using Mach from outside MozillaBuild, then see
https://firefox-source-docs.mozilla.org/mach/windows-usage-outside-mozillabuild.html#install-python
for guidance on installing native Python on your system.
""").strip())
else:
print(dedent("""
We do not have specific instructions for your platform on how to
install Python. You may find Pyenv (https://github.com/pyenv/pyenv)
helpful, if your system package manager does not provide a way to
install a recent enough Python 3.
""").strip())
sys.exit(1)
# XCode python sets __PYVENV_LAUNCHER__, which overrides the executable
# used when a python subprocess is created. This is an issue when we want
# to run using our virtualenv python executables.
# In future Python relases, __PYVENV_LAUNCHER__ will be cleared before
# application code (mach) is started.
# https://github.com/python/cpython/pull/9516
os.environ.pop("__PYVENV_LAUNCHER__", None)
mach = check_and_get_mach(os.path.dirname(os.path.realpath(__file__)))
if not mach:
print('Could not run mach: No mach source directory found.')
sys.exit(1)
sys.exit(mach.run(args))
if __name__ == '__main__':
main(sys.argv[1:])
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