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Bug 1740123: Move Python version check earlier r=ahal

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Move Python version check as early as possible so that more code can
safely depend on modern behaviour while out-of-date Python versions still
get graceful error messages.

Without this change, Python 2 usages fail on importing `importlib.util`
before the nice "out-of-date version" warning is printed.

Differential Revision: https://phabricator.services.mozilla.com/D134185
This commit is contained in:
Mitchell Hentges 2022-01-06 00:32:49 +00:00
parent 7e6a4952a2
commit 0445e1ce71
2 changed files with 35 additions and 41 deletions
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41
build/mach_initialize.py
View File

@ -6,7 +6,6 @@ from __future__ import division, print_function, unicode_literals
import math
import os
import platform
import shutil
import sys
@ -140,31 +139,6 @@ CATEGORIES = {
},
}
INSTALL_PYTHON_GUIDANCE_LINUX = """
See https://firefox-source-docs.mozilla.org/setup/linux_build.html#installingpython
for guidance on how to install Python on your system.
""".strip()
INSTALL_PYTHON_GUIDANCE_OSX = """
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()
INSTALL_PYTHON_GUIDANCE_MOZILLABUILD = """
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()
INSTALL_PYTHON_GUIDANCE_OTHER = """
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()
def _activate_python_environment(topsrcdir, get_state_dir):
from mach.site import MachSiteManager
@ -177,21 +151,6 @@ def _activate_python_environment(topsrcdir, get_state_dir):
def initialize(topsrcdir):
# Ensure we are running Python 3.6+. We run this check as soon as
# possible to avoid a cryptic import/usage error.
if sys.version_info < (3, 6):
print("Python 3.6+ is required to run mach.")
print("You are running Python", platform.python_version())
if sys.platform.startswith("linux"):
print(INSTALL_PYTHON_GUIDANCE_LINUX)
elif sys.platform.startswith("darwin"):
print(INSTALL_PYTHON_GUIDANCE_OSX)
elif "MOZILLABUILD" in os.environ:
print(INSTALL_PYTHON_GUIDANCE_MOZILLABUILD)
else:
print(INSTALL_PYTHON_GUIDANCE_OTHER)
sys.exit(1)
# This directory was deleted in bug 1666345, but there may be some ignored
# files here. We can safely just delete it for the user so they don't have
# to clean the repo themselves.

35
mach
View File

@ -6,10 +6,14 @@
from __future__ import absolute_import, print_function, unicode_literals
import os
import platform
import sys
from textwrap import dedent
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)
@ -33,6 +37,37 @@ def check_and_get_mach(dir_path):
def main(args):
# Ensure we are running Python 3.6+. We run this check as soon as
# possible to avoid a cryptic import/usage error.
if sys.version_info < (3, 6):
print("Python 3.6+ is required to run mach.")
print("You are running Python", platform.python_version())
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:
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())
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.