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import contextlib

import functools

import os

import sys

from typing import Dict

from typing import Generator

from typing import Optional

from typing import Sequence

from typing import Tuple

import pre_commit.constants as C

from pre_commit.envcontext import envcontext

from pre_commit.envcontext import PatchesT

from pre_commit.envcontext import UNSET

from pre_commit.envcontext import Var

from pre_commit.hook import Hook

from pre_commit.languages import helpers

from pre_commit.parse_shebang import find_executable

from pre_commit.prefix import Prefix

from pre_commit.util import CalledProcessError

from pre_commit.util import clean_path_on_failure

from pre_commit.util import cmd_output

from pre_commit.util import cmd_output_b

from pre_commit.util import win_exe

ENVIRONMENT_DIR = 'py_env'

@functools.lru_cache(maxsize=None)

def _version_info(exe: str) -> str:

prog = 'import sys;print(".".join(str(p) for p in sys.version_info))'

try:

return cmd_output(exe, '-S', '-c', prog)[1].strip()

except CalledProcessError:

return f'<<error retrieving version from {exe}>>'

def _read_pyvenv_cfg(filename: str) -> Dict[str, str]:

ret = {}

with open(filename, encoding='UTF-8') as f:

for line in f:

try:

k, v = line.split('=')

except ValueError: # blank line / comment / etc.

continue

else:

ret[k.strip()] = v.strip()

return ret

def bin_dir(venv: str) -> str:

"""On windows there's a different directory for the virtualenv"""

bin_part = 'Scripts' if os.name == 'nt' else 'bin'

return os.path.join(venv, bin_part)

def get_env_patch(venv: str) -> PatchesT:

return (

('PIP_DISABLE_PIP_VERSION_CHECK', '1'),

('PYTHONHOME', UNSET),

('VIRTUAL_ENV', venv),

('PATH', (bin_dir(venv), os.pathsep, Var('PATH'))),

)

def _find_by_py_launcher(

version: str,

) -> Optional[str]: # pragma: no cover (windows only)

if version.startswith('python'):

num = version[len('python'):]

cmd = ('py', f'-{num}', '-c', 'import sys; print(sys.executable)')

env = dict(os.environ, PYTHONIOENCODING='UTF-8')

try:

return cmd_output(*cmd, env=env)[1].strip()

except CalledProcessError:

pass

return None

def _find_by_sys_executable() -> Optional[str]:

def _norm(path: str) -> Optional[str]:

_, exe = os.path.split(path.lower())

exe, _, _ = exe.partition('.exe')

if exe not in {'python', 'pythonw'} and find_executable(exe):

return exe

return None

# On linux, I see these common sys.executables:

# system `python`: /usr/bin/python -> python2.7

# system `python2`: /usr/bin/python2 -> python2.7

# virtualenv v: v/bin/python (will not return from this loop)

# virtualenv v -ppython2: v/bin/python -> python2

# virtualenv v -ppython2.7: v/bin/python -> python2.7

# virtualenv v -ppypy: v/bin/python -> v/bin/pypy

for path in (sys.executable, os.path.realpath(sys.executable)):

exe = _norm(path)

if exe:

return exe

return None

@functools.lru_cache(maxsize=1)

def get_default_version() -> str: # pragma: no cover (platform dependent)

# First attempt from `sys.executable` (or the realpath)

exe = _find_by_sys_executable()

if exe:

return exe

# Next try the `pythonX.X` executable

exe = f'python{sys.version_info[0]}.{sys.version_info[1]}'

if find_executable(exe):

return exe

if _find_by_py_launcher(exe):

return exe

# We tried!

return C.DEFAULT

def _sys_executable_matches(version: str) -> bool:

if version == 'python':

return True

elif not version.startswith('python'):

return False

try:

info = tuple(int(p) for p in version[len('python'):].split('.'))

except ValueError:

return False

return sys.version_info[:len(info)] == info

def norm_version(version: str) -> Optional[str]:

if version == C.DEFAULT: # use virtualenv's default

return None

elif _sys_executable_matches(version): # virtualenv defaults to our exe

return None

if os.name == 'nt': # pragma: no cover (windows)

version_exec = _find_by_py_launcher(version)

if version_exec:

return version_exec

# Try looking up by name

version_exec = find_executable(version)

if version_exec and version_exec != version:

return version_exec

# Otherwise assume it is a path

return os.path.expanduser(version)

@contextlib.contextmanager

def in_env(

prefix: Prefix,

language_version: str,

) -> Generator[None, None, None]:

directory = helpers.environment_dir(ENVIRONMENT_DIR, language_version)

envdir = prefix.path(directory)

with envcontext(get_env_patch(envdir)):

yield

def healthy(prefix: Prefix, language_version: str) -> bool:

directory = helpers.environment_dir(ENVIRONMENT_DIR, language_version)

envdir = prefix.path(directory)

pyvenv_cfg = os.path.join(envdir, 'pyvenv.cfg')

# created with "old" virtualenv

if not os.path.exists(pyvenv_cfg):

return False

exe_name = win_exe('python')

py_exe = prefix.path(bin_dir(envdir), exe_name)

cfg = _read_pyvenv_cfg(pyvenv_cfg)

return (

'version_info' in cfg and

# always use uncached lookup here in case we replaced an unhealthy env

_version_info.__wrapped__(py_exe) == cfg['version_info'] and (

'base-executable' not in cfg or

_version_info(cfg['base-executable']) == cfg['version_info']

)

def install_environment(

prefix: Prefix,

version: str,

additional_dependencies: Sequence[str],

) -> None:

envdir = prefix.path(helpers.environment_dir(ENVIRONMENT_DIR, version))

venv_cmd = [sys.executable, '-mvirtualenv', envdir]

python = norm_version(version)

if python is not None:

venv_cmd.extend(('-p', python))

install_cmd = ('python', '-mpip', 'install', '.', *additional_dependencies)

with clean_path_on_failure(envdir):

cmd_output_b(*venv_cmd, cwd='/')

with in_env(prefix, version):

helpers.run_setup_cmd(prefix, install_cmd)

def run_hook(

hook: Hook,

file_args: Sequence[str],

color: bool,

) -> Tuple[int, bytes]:

with in_env(hook.prefix, hook.language_version):

return helpers.run_xargs(hook, hook.cmd, file_args, color=color)

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