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158 lines (123 loc) · 4.98 KB
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from __future__ import unicode_literals
import contextlib
import os
import sys
from pre_commit.envcontext import envcontext
from pre_commit.envcontext import UNSET
from pre_commit.envcontext import Var
from pre_commit.languages import helpers
from pre_commit.parse_shebang import find_executable
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.xargs import xargs
ENVIRONMENT_DIR = 'py_env'
def bin_dir(venv):
"""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):
return (
('PYTHONHOME', UNSET),
('VIRTUAL_ENV', venv),
('PATH', (bin_dir(venv), os.pathsep, Var('PATH'))),
)
def _find_by_py_launcher(version): # pragma: no cover (windows only)
if version.startswith('python'):
try:
return cmd_output(
'py', '-{}'.format(version[len('python'):]),
'-c', 'import sys; print(sys.executable)',
)[1].strip()
except CalledProcessError:
pass
def _get_default_version(): # pragma: no cover (platform dependent)
def _norm(path):
_, exe = os.path.split(path.lower())
exe, _, _ = exe.partition('.exe')
if find_executable(exe) and exe not in {'python', 'pythonw'}:
return exe
# First attempt from `sys.executable` (or the realpath)
# 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
# Next try the `pythonX.X` executable
exe = 'python{}.{}'.format(*sys.version_info)
if find_executable(exe):
return exe
if _find_by_py_launcher(exe):
return exe
# Give a best-effort try for windows
if os.path.exists(r'C:\{}\python.exe'.format(exe.replace('.', ''))):
return exe
# We tried!
return 'default'
def get_default_version():
# TODO: when dropping python2, use `functools.lru_cache(maxsize=1)`
try:
return get_default_version.cached_version
except AttributeError:
get_default_version.cached_version = _get_default_version()
return get_default_version()
def norm_version(version):
if os.name == 'nt': # pragma: no cover (windows)
# Try looking up by name
version_exec = find_executable(version)
if version_exec and version_exec != version:
return version_exec
version_exec = _find_by_py_launcher(version)
if version_exec:
return version_exec
# If it is in the form pythonx.x search in the default
# place on windows
if version.startswith('python'):
return r'C:\{}\python.exe'.format(version.replace('.', ''))
# Otherwise assume it is a path
return os.path.expanduser(version)
def py_interface(_dir, _make_venv):
@contextlib.contextmanager
def in_env(prefix, language_version):
envdir = prefix.path(helpers.environment_dir(_dir, language_version))
with envcontext(get_env_patch(envdir)):
yield
def healthy(prefix, language_version):
with in_env(prefix, language_version):
retcode, _, _ = cmd_output(
'python', '-c',
'import ctypes, datetime, io, os, ssl, weakref',
retcode=None,
)
return retcode == 0
def run_hook(prefix, hook, file_args):
with in_env(prefix, hook['language_version']):
return xargs(helpers.to_cmd(hook), file_args)
def install_environment(prefix, version, additional_dependencies):
additional_dependencies = tuple(additional_dependencies)
directory = helpers.environment_dir(_dir, version)
env_dir = prefix.path(directory)
with clean_path_on_failure(env_dir):
if version != 'default':
python = norm_version(version)
else:
python = os.path.realpath(sys.executable)
_make_venv(env_dir, python)
with in_env(prefix, version):
helpers.run_setup_cmd(
prefix, ('pip', 'install', '.') + additional_dependencies,
)
return in_env, healthy, run_hook, install_environment
def make_venv(envdir, python):
env = dict(os.environ, VIRTUALENV_NO_DOWNLOAD='1')
cmd = (sys.executable, '-mvirtualenv', envdir, '-p', python)
cmd_output(*cmd, env=env, cwd='/')
_interface = py_interface(ENVIRONMENT_DIR, make_venv)
in_env, healthy, run_hook, install_environment = _interface