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from __future__ import unicode_literals

import os.path

import sys

from pre_commit.languages import python

from pre_commit.util import CalledProcessError

from pre_commit.util import cmd_output

from pre_commit.util import cmd_output_b

ENVIRONMENT_DIR = 'py_venv'

def get_default_version(): # pragma: no cover (version specific)

if sys.version_info < (3,):

return 'python3'

else:

return python.get_default_version()

def orig_py_exe(exe): # pragma: no cover (platform specific)

"""A -mvenv virtualenv made from a -mvirtualenv virtualenv installs

packages to the incorrect location. Attempt to find the _original_ exe

and invoke `-mvenv` from there.

See:

- https://github.com/pre-commit/pre-commit/issues/755

- https://github.com/pypa/virtualenv/issues/1095

- https://bugs.python.org/issue30811

"""

try:

prefix_script = 'import sys; print(sys.real_prefix)'

_, prefix, _ = cmd_output(exe, '-c', prefix_script)

prefix = prefix.strip()

except CalledProcessError:

# not created from -mvirtualenv

return exe

if os.name == 'nt':

expected = os.path.join(prefix, 'python.exe')

else:

expected = os.path.join(prefix, 'bin', os.path.basename(exe))

if os.path.exists(expected):

return expected

else:

return exe

def make_venv(envdir, python):

cmd_output_b(orig_py_exe(python), '-mvenv', envdir, cwd='/')

_interface = python.py_interface(ENVIRONMENT_DIR, make_venv)

in_env, healthy, run_hook, install_environment = _interface

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