#!/usr/bin/env python3
# (Actually, we invoke this script with a specific python3 determined by configure.)
# Adapted from examples in https://docs.python.org/3/library/venv.html
import venv
import sys
import argparse
parser = argparse.ArgumentParser(prog=__name__,
description='Creates a virtual Python '
'environment in a target directory.')
parser.add_argument('env_dir', metavar='ENV_DIR',
help='A directory in which to create the'
'virtual environment.')
parser.add_argument('--system-site-packages', default=False,
action='store_true', dest='system_site',
help='Give the virtual environment access to the '
'system site-packages dir.')
parser.add_argument('--clear', default=False, action='store_true',
dest='clear', help='Delete the contents of the '
'virtual environment '
'directory if it already '
'exists, before virtual '
'environment creation.')
parser.add_argument('--upgrade', default=False, action='store_true',
dest='upgrade', help='Upgrade the virtual '
'environment directory to '
'use this version of '
'Python, assuming Python '
'has been upgraded '
'in-place.')
options = parser.parse_args()
if options.upgrade and options.clear:
raise ValueError('you cannot supply --upgrade and --clear together.')
# On macOS, definitely need symlinks=True (which matches what we test in build/pkgs/spkg-configure.m4)
# or it may fail with 'dyld: Library not loaded: @executable_path/../Python3' on macOS.
b = venv.EnvBuilder(system_site_packages=options.system_site,
clear=options.clear,
upgrade=options.upgrade,
symlinks=True)
c = b.ensure_directories(options.env_dir)
b.setup_python(c)
b.create_configuration(c)
# We do not call setup_scripts, which would install the venv 'activate'/'deactivate' scripts.
