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"""Virtual environment management."""
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import json
import os
import sys
from . import types as t
from .config import (
EnvironmentConfig,
)
from .util import (
find_python,
SubprocessError,
get_available_python_versions,
SUPPORTED_PYTHON_VERSIONS,
ANSIBLE_TEST_DATA_ROOT,
display,
remove_tree,
)
from .util_common import (
run_command,
)
def create_virtual_environment(args, # type: EnvironmentConfig
version, # type: str
path, # type: str
system_site_packages=False, # type: bool
pip=True, # type: bool
): # type: (...) -> bool
"""Create a virtual environment using venv or virtualenv for the requested Python version."""
if os.path.isdir(path):
display.info('Using existing Python %s virtual environment: %s' % (version, path), verbosity=1)
return True
python = find_python(version, required=False)
python_version = tuple(int(v) for v in version.split('.'))
if not python:
# the requested python version could not be found
return False
if python_version >= (3, 0):
# use the built-in 'venv' module on Python 3.x
# creating a virtual environment using 'venv' when running in a virtual environment created by 'virtualenv' results
# in a copy of the original virtual environment instead of creation of a new one
# avoid this issue by only using "real" python interpreters to invoke 'venv'
for real_python in iterate_real_pythons(args, version):
if run_venv(args, real_python, system_site_packages, pip, path):
display.info('Created Python %s virtual environment using "venv": %s' % (version, path), verbosity=1)
return True
# something went wrong, most likely the package maintainer for the Python installation removed ensurepip
# which will prevent creation of a virtual environment without installation of other OS packages
# use the installed 'virtualenv' module on the Python requested version
if run_virtualenv(args, python, python, system_site_packages, pip, path):
display.info('Created Python %s virtual environment using "virtualenv": %s' % (version, path), verbosity=1)
return True
available_pythons = get_available_python_versions(SUPPORTED_PYTHON_VERSIONS)
for available_python_version, available_python_interpreter in sorted(available_pythons.items()):
virtualenv_version = get_virtualenv_version(args, available_python_interpreter)
if not virtualenv_version:
# virtualenv not available for this Python or we were unable to detect the version
continue
if python_version == (2, 6) and virtualenv_version >= (16, 0, 0):
# virtualenv 16.0.0 dropped python 2.6 support: https://virtualenv.pypa.io/en/latest/changes/#v16-0-0-2018-05-16
continue
# try using 'virtualenv' from another Python to setup the desired version
if run_virtualenv(args, available_python_interpreter, python, system_site_packages, pip, path):
display.info('Created Python %s virtual environment using "virtualenv" on Python %s: %s' % (version, available_python_version, path), verbosity=1)
return True
# no suitable 'virtualenv' available
return False
def iterate_real_pythons(args, version): # type: (EnvironmentConfig, str) -> t.Iterable[str]
"""
Iterate through available real python interpreters of the requested version.
The current interpreter will be checked and then the path will be searched.
"""
version_info = tuple(int(n) for n in version.split('.'))
current_python = None
if version_info == sys.version_info[:len(version_info)]:
current_python = sys.executable
real_prefix = get_python_real_prefix(args, current_python)
if real_prefix:
current_python = find_python(version, os.path.join(real_prefix, 'bin'))
if current_python:
yield current_python
path = os.environ.get('PATH', os.path.defpath)
if not path:
return
found_python = find_python(version, path)
if not found_python:
return
if found_python == current_python:
return
real_prefix = get_python_real_prefix(args, found_python)
if real_prefix:
found_python = find_python(version, os.path.join(real_prefix, 'bin'))
if found_python:
yield found_python
def get_python_real_prefix(args, path): # type: (EnvironmentConfig, str) -> t.Optional[str]
"""
Return the real prefix of the specified interpreter or None if the interpreter is not a virtual environment created by 'virtualenv'.
"""
cmd = [path, os.path.join(os.path.join(ANSIBLE_TEST_DATA_ROOT, 'virtualenvcheck.py'))]
check_result = json.loads(run_command(args, cmd, capture=True, always=True)[0])
real_prefix = check_result['real_prefix']
return real_prefix
def run_venv(args, # type: EnvironmentConfig
run_python, # type: str
system_site_packages, # type: bool
pip, # type: bool
path, # type: str
): # type: (...) -> bool
"""Create a virtual environment using the 'venv' module. Not available on Python 2.x."""
cmd = [run_python, '-m', 'venv']
if system_site_packages:
cmd.append('--system-site-packages')
if not pip:
cmd.append('--without-pip')
cmd.append(path)
try:
run_command(args, cmd, capture=True)
except SubprocessError as ex:
remove_tree(path)
if args.verbosity > 1:
display.error(ex)
return False
return True
def run_virtualenv(args, # type: EnvironmentConfig
run_python, # type: str
env_python, # type: str
system_site_packages, # type: bool
pip, # type: bool
path, # type: str
): # type: (...) -> bool
"""Create a virtual environment using the 'virtualenv' module."""
# always specify --python to guarantee the desired interpreter is provided
# otherwise virtualenv may select a different interpreter than the one running virtualenv
cmd = [run_python, '-m', 'virtualenv', '--python', env_python]
if system_site_packages:
cmd.append('--system-site-packages')
if not pip:
cmd.append('--no-pip')
cmd.append(path)
try:
run_command(args, cmd, capture=True)
except SubprocessError as ex:
remove_tree(path)
if args.verbosity > 1:
display.error(ex)
return False
return True
def get_virtualenv_version(args, python): # type: (EnvironmentConfig, str) -> t.Optional[t.Tuple[int, ...]]
"""Get the virtualenv version for the given python intepreter, if available."""
try:
return get_virtualenv_version.result
except AttributeError:
pass
get_virtualenv_version.result = None
cmd = [python, '-m', 'virtualenv', '--version']
try:
stdout = run_command(args, cmd, capture=True)[0]
except SubprocessError as ex:
if args.verbosity > 1:
display.error(ex)
stdout = ''
if stdout:
# noinspection PyBroadException
try:
get_virtualenv_version.result = tuple(int(v) for v in stdout.strip().split('.'))
except Exception: # pylint: disable=broad-except
pass
return get_virtualenv_version.result
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