134 lines
3.6 KiB
Python
134 lines
3.6 KiB
Python
from __future__ import annotations
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import multiprocessing
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import os
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import random
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import re
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from typing import Any
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from typing import NoReturn
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from typing import overload
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from typing import Sequence
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import pre_commit.constants as C
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from pre_commit import parse_shebang
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from pre_commit.hook import Hook
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from pre_commit.prefix import Prefix
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from pre_commit.util import cmd_output_b
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from pre_commit.xargs import xargs
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FIXED_RANDOM_SEED = 1542676187
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SHIMS_RE = re.compile(r'[/\\]shims[/\\]')
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def exe_exists(exe: str) -> bool:
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found = parse_shebang.find_executable(exe)
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if found is None: # exe exists
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return False
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homedir = os.path.expanduser('~')
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try:
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common: str | None = os.path.commonpath((found, homedir))
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except ValueError: # on windows, different drives raises ValueError
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common = None
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return (
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# it is not in a /shims/ directory
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not SHIMS_RE.search(found) and
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(
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# the homedir is / (docker, service user, etc.)
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os.path.dirname(homedir) == homedir or
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# the exe is not contained in the home directory
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common != homedir
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)
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)
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def run_setup_cmd(prefix: Prefix, cmd: tuple[str, ...], **kwargs: Any) -> None:
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cmd_output_b(*cmd, cwd=prefix.prefix_dir, **kwargs)
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@overload
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def environment_dir(d: None, language_version: str) -> None: ...
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@overload
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def environment_dir(d: str, language_version: str) -> str: ...
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def environment_dir(d: str | None, language_version: str) -> str | None:
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if d is None:
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return None
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else:
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return f'{d}-{language_version}'
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def assert_version_default(binary: str, version: str) -> None:
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if version != C.DEFAULT:
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raise AssertionError(
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f'for now, pre-commit requires system-installed {binary} -- '
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f'you selected `language_version: {version}`',
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)
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def assert_no_additional_deps(
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lang: str,
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additional_deps: Sequence[str],
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) -> None:
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if additional_deps:
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raise AssertionError(
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f'for now, pre-commit does not support '
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f'additional_dependencies for {lang} -- '
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f'you selected `additional_dependencies: {additional_deps}`',
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)
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def basic_get_default_version() -> str:
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return C.DEFAULT
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def basic_health_check(prefix: Prefix, language_version: str) -> str | None:
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return None
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def no_install(
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prefix: Prefix,
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version: str,
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additional_dependencies: Sequence[str],
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) -> NoReturn:
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raise AssertionError('This type is not installable')
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def target_concurrency(hook: Hook) -> int:
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if hook.require_serial or 'PRE_COMMIT_NO_CONCURRENCY' in os.environ:
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return 1
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else:
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# Travis appears to have a bunch of CPUs, but we can't use them all.
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if 'TRAVIS' in os.environ:
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return 2
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else:
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try:
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return multiprocessing.cpu_count()
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except NotImplementedError:
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return 1
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def _shuffled(seq: Sequence[str]) -> list[str]:
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"""Deterministically shuffle"""
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fixed_random = random.Random()
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fixed_random.seed(FIXED_RANDOM_SEED, version=1)
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seq = list(seq)
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fixed_random.shuffle(seq)
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return seq
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def run_xargs(
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hook: Hook,
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cmd: tuple[str, ...],
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file_args: Sequence[str],
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**kwargs: Any,
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) -> tuple[int, bytes]:
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# Shuffle the files so that they more evenly fill out the xargs partitions,
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# but do it deterministically in case a hook cares about ordering.
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file_args = _shuffled(file_args)
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kwargs['target_concurrency'] = target_concurrency(hook)
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return xargs(cmd, file_args, **kwargs)
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