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python.py
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from __future__ import annotations import contextlib import functools import os import sys from typing import Generator from typing import Sequence import pre_commit.constants as C from pre_commit import lang_base 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.parse_shebang import find_executable from pre_commit.prefix import Prefix from pre_commit.util import CalledProcessError 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' run_hook = lang_base.basic_run_hook @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 sys.platform == 'win32' 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, ) -> str | None: # 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() -> str | None: def _norm(path: str) -> str | None: _, 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) -> str | None: if version == C.DEFAULT: # use virtualenv's default return None elif _sys_executable_matches(version): # virtualenv defaults to our exe return None if sys.platform == 'win32': # 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, version: str) -> Generator[None, None, None]: envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version) with envcontext(get_env_patch(envdir)): yield def health_check(prefix: Prefix, version: str) -> str | None: envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version) pyvenv_cfg = os.path.join(envdir, 'pyvenv.cfg') # created with "old" virtualenv if not os.path.exists(pyvenv_cfg): return 'pyvenv.cfg does not exist (old virtualenv?)' exe_name = win_exe('python') py_exe = prefix.path(bin_dir(envdir), exe_name) cfg = _read_pyvenv_cfg(pyvenv_cfg) if 'version_info' not in cfg: return "created virtualenv's pyvenv.cfg is missing `version_info`" # always use uncached lookup here in case we replaced an unhealthy env virtualenv_version = _version_info.__wrapped__(py_exe) if virtualenv_version != cfg['version_info']: return ( f'virtualenv python version did not match created version:\n' f'- actual version: {virtualenv_version}\n' f'- expected version: {cfg["version_info"]}\n' ) # made with an older version of virtualenv? skip `base-executable` check if 'base-executable' not in cfg: return None base_exe_version = _version_info(cfg['base-executable']) if base_exe_version != cfg['version_info']: return ( f'base executable python version does not match created version:\n' f'- base-executable version: {base_exe_version}\n' f'- expected version: {cfg["version_info"]}\n' ) else: return None def install_environment( prefix: Prefix, version: str, additional_dependencies: Sequence[str], ) -> None: envdir = lang_base.environment_dir(prefix, 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) cmd_output_b(*venv_cmd, cwd='/') with in_env(prefix, version): lang_base.setup_cmd(prefix, install_cmd)