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128 lines
4.1 KiB
Python
128 lines
4.1 KiB
Python
from __future__ import unicode_literals
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import contextlib
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import os
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import sys
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from pre_commit.envcontext import envcontext
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from pre_commit.envcontext import UNSET
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from pre_commit.envcontext import Var
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from pre_commit.languages import helpers
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from pre_commit.parse_shebang import find_executable
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from pre_commit.util import clean_path_on_failure
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from pre_commit.xargs import xargs
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ENVIRONMENT_DIR = 'py_env'
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get_default_version = helpers.basic_get_default_version
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def bin_dir(venv):
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"""On windows there's a different directory for the virtualenv"""
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bin_part = 'Scripts' if os.name == 'nt' else 'bin'
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return os.path.join(venv, bin_part)
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def get_env_patch(venv):
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return (
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('PYTHONHOME', UNSET),
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('VIRTUAL_ENV', venv),
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('PATH', (bin_dir(venv), os.pathsep, Var('PATH'))),
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)
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@contextlib.contextmanager
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def in_env(repo_cmd_runner, language_version):
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envdir = repo_cmd_runner.path(
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helpers.environment_dir(ENVIRONMENT_DIR, language_version),
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)
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with envcontext(get_env_patch(envdir)):
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yield
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def _get_default_version(): # pragma: no cover (platform dependent)
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def _norm(path):
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_, exe = os.path.split(path.lower())
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exe, _, _ = exe.partition('.exe')
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if find_executable(exe) and exe not in {'python', 'pythonw'}:
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return exe
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# First attempt from `sys.executable` (or the realpath)
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# On linux, I see these common sys.executables:
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#
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# system `python`: /usr/bin/python -> python2.7
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# system `python2`: /usr/bin/python2 -> python2.7
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# virtualenv v: v/bin/python (will not return from this loop)
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# virtualenv v -ppython2: v/bin/python -> python2
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# virtualenv v -ppython2.7: v/bin/python -> python2.7
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# virtualenv v -ppypy: v/bin/python -> v/bin/pypy
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for path in {sys.executable, os.path.realpath(sys.executable)}:
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exe = _norm(path)
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if exe:
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return exe
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# Next try the `pythonX.X` executable
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exe = 'python{}.{}'.format(*sys.version_info)
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if find_executable(exe):
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return exe
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# Give a best-effort try for windows
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if os.path.exists(r'C:\{}\python.exe'.format(exe.replace('.', ''))):
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return exe
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# We tried!
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return 'default'
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def get_default_version():
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# TODO: when dropping python2, use `functools.lru_cache(maxsize=1)`
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try:
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return get_default_version.cached_version
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except AttributeError:
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get_default_version.cached_version = _get_default_version()
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return get_default_version()
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def norm_version(version):
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if os.name == 'nt': # pragma: no cover (windows)
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# Try looking up by name
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version_exec = find_executable(version)
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if version_exec and version_exec != version:
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return version_exec
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# If it is in the form pythonx.x search in the default
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# place on windows
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if version.startswith('python'):
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return r'C:\{}\python.exe'.format(version.replace('.', ''))
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# Otherwise assume it is a path
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return os.path.expanduser(version)
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def install_environment(repo_cmd_runner, version, additional_dependencies):
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additional_dependencies = tuple(additional_dependencies)
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directory = helpers.environment_dir(ENVIRONMENT_DIR, version)
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# Install a virtualenv
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with clean_path_on_failure(repo_cmd_runner.path(directory)):
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venv_cmd = [
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sys.executable, '-m', 'virtualenv',
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'{{prefix}}{}'.format(directory),
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]
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if version != 'default':
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venv_cmd.extend(['-p', norm_version(version)])
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else:
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venv_cmd.extend(['-p', os.path.realpath(sys.executable)])
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venv_env = dict(os.environ, VIRTUALENV_NO_DOWNLOAD='1')
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repo_cmd_runner.run(venv_cmd, cwd='/', env=venv_env)
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with in_env(repo_cmd_runner, version):
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helpers.run_setup_cmd(
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repo_cmd_runner,
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('pip', 'install', '.') + additional_dependencies,
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)
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def run_hook(repo_cmd_runner, hook, file_args):
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with in_env(repo_cmd_runner, hook['language_version']):
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return xargs(helpers.to_cmd(hook), file_args)
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