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# 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
from __future__ import absolute_import, print_function, unicode_literals
import os
import six
import subprocess
import sys
from distutils.version import StrictVersion
def iter_modules_in_path(*paths):
paths = [os.path.abspath(os.path.normcase(p)) + os.sep for p in paths]
for name, module in sys.modules.items():
if getattr(module, "__file__", None) is None:
if module.__file__ is None:
path = module.__file__
if path.endswith(".pyc"):
path = path[:-1]
path = os.path.abspath(os.path.normcase(path))
if any(path.startswith(p) for p in paths):
yield path
def python_executable_version(exe):
"""Determine the version of a Python executable by invoking it.
May raise ``subprocess.CalledProcessError`` or ``ValueError`` on failure.
program = "import sys; print('.'.join(map(str, sys.version_info[0:3])))"
out = six.ensure_text(
subprocess.check_output([exe, "-c", program], universal_newlines=True)
return StrictVersion(out)
def _find_python_executable(major):
if major not in (2, 3):
raise ValueError("Expected a Python major version of 2 or 3")
min_versions = {2: "2.7.0", 3: "3.6.0"}
def ret(min_version=min_versions[major]):
from mozfile import which
prefix = min_version[0] + "."
if not min_version.startswith(prefix):
raise ValueError(
"min_version expected a %sx string, got %s" % (prefix, min_version)
min_version = StrictVersion(min_version)
major = min_version.version[0]
if sys.version_info.major == major:
our_version = StrictVersion("%s.%s.%s" % (sys.version_info[0:3]))
if our_version >= min_version:
# This will potentially return a virtualenv Python. It's probably
# OK for now...
return sys.executable, our_version.version
# Else fall back to finding another binary.
# defines how the Python binary
# should be named. `python3` should refer to some Python 3, and
# `python2` to some Python 2. `python` may refer to a Python 2 or 3.
# `pythonX.Y` may exist.
# Since `python` is ambiguous and `pythonX` should always exist, we
# ignore `python` here. We instead look for the preferred `pythonX` first
# and fall back to `pythonX.Y` if it isn't found or doesn't meet our
# version requirements.
names = ["python%d" % major]
# Look for `pythonX.Y` down to our minimum version.
for minor in range(9, min_version.version[1] - 1, -1):
names.append("python%d.%d" % (major, minor))
for name in names:
exe = which(name)
if not exe:
# We always verify we can invoke the executable and its version is
# sane.
version = python_executable_version(exe)
except (subprocess.CalledProcessError, ValueError):
if version >= min_version:
return exe, version.version
return None, None
return ret
find_python3_executable = _find_python_executable(3)