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✍️ Editing: hook_impl.py

            File: /opt/hc_python/lib/python3.12/site-packages/pre_commit/commands/hook_impl.py

            Size: 9.2 KB | 
            Last Modified: 2025-12-03 14:34:45        

from __future__ import annotations

import argparse
import os.path
import subprocess
import sys
from collections.abc import Sequence

from pre_commit.commands.run import run
from pre_commit.envcontext import envcontext
from pre_commit.parse_shebang import normalize_cmd
from pre_commit.store import Store

Z40 = '0' * 40

def _run_legacy(
        hook_type: str,
        hook_dir: str,
        args: Sequence[str],
) -> tuple[int, bytes]:
    if os.environ.get('PRE_COMMIT_RUNNING_LEGACY'):
        raise SystemExit(
            f"bug: pre-commit's script is installed in migration mode\n"
            f'run `pre-commit install -f --hook-type {hook_type}` to fix '
            f'this\n\n'
            f'Please report this bug at '
            f'https://github.com/pre-commit/pre-commit/issues',
        )

if hook_type == 'pre-push':
        stdin = sys.stdin.buffer.read()
    else:
        stdin = b''

# not running in legacy mode
    legacy_hook = os.path.join(hook_dir, f'{hook_type}.legacy')
    if not os.access(legacy_hook, os.X_OK):
        return 0, stdin

with envcontext((('PRE_COMMIT_RUNNING_LEGACY', '1'),)):
        cmd = normalize_cmd((legacy_hook, *args))
        return subprocess.run(cmd, input=stdin).returncode, stdin

def _validate_config(
        retv: int,
        config: str,
        skip_on_missing_config: bool,
) -> None:
    if not os.path.isfile(config):
        if skip_on_missing_config or os.getenv('PRE_COMMIT_ALLOW_NO_CONFIG'):
            print(f'`{config}` config file not found. Skipping `pre-commit`.')
            raise SystemExit(retv)
        else:
            print(
                f'No {config} file was found\n'
                f'- To temporarily silence this, run '
                f'`PRE_COMMIT_ALLOW_NO_CONFIG=1 git ...`\n'
                f'- To permanently silence this, install pre-commit with the '
                f'--allow-missing-config option\n'
                f'- To uninstall pre-commit run `pre-commit uninstall`',
            )
            raise SystemExit(1)

def _ns(
        hook_type: str,
        color: bool,
        *,
        all_files: bool = False,
        remote_branch: str | None = None,
        local_branch: str | None = None,
        from_ref: str | None = None,
        to_ref: str | None = None,
        pre_rebase_upstream: str | None = None,
        pre_rebase_branch: str | None = None,
        remote_name: str | None = None,
        remote_url: str | None = None,
        commit_msg_filename: str | None = None,
        prepare_commit_message_source: str | None = None,
        commit_object_name: str | None = None,
        checkout_type: str | None = None,
        is_squash_merge: str | None = None,
        rewrite_command: str | None = None,
) -> argparse.Namespace:
    return argparse.Namespace(
        color=color,
        hook_stage=hook_type,
        remote_branch=remote_branch,
        local_branch=local_branch,
        from_ref=from_ref,
        to_ref=to_ref,
        pre_rebase_upstream=pre_rebase_upstream,
        pre_rebase_branch=pre_rebase_branch,
        remote_name=remote_name,
        remote_url=remote_url,
        commit_msg_filename=commit_msg_filename,
        prepare_commit_message_source=prepare_commit_message_source,
        commit_object_name=commit_object_name,
        all_files=all_files,
        checkout_type=checkout_type,
        is_squash_merge=is_squash_merge,
        rewrite_command=rewrite_command,
        files=(),
        hook=None,
        verbose=False,
        show_diff_on_failure=False,
        fail_fast=False,
    )

def _rev_exists(rev: str) -> bool:
    return not subprocess.call(('git', 'rev-list', '--quiet', rev))

def _pre_push_ns(
        color: bool,
        args: Sequence[str],
        stdin: bytes,
) -> argparse.Namespace | None:
    remote_name = args[0]
    remote_url = args[1]

for line in stdin.decode().splitlines():
        parts = line.rsplit(maxsplit=3)
        local_branch, local_sha, remote_branch, remote_sha = parts
        if local_sha == Z40:
            continue
        elif remote_sha != Z40 and _rev_exists(remote_sha):
            return _ns(
                'pre-push', color,
                from_ref=remote_sha, to_ref=local_sha,
                remote_branch=remote_branch,
                local_branch=local_branch,
                remote_name=remote_name, remote_url=remote_url,
            )
        else:
            # ancestors not found in remote
            ancestors = subprocess.check_output((
                'git', 'rev-list', local_sha, '--topo-order', '--reverse',
                '--not', f'--remotes={remote_name}',
            )).decode().strip()
            if not ancestors:
                continue
            else:
                first_ancestor = ancestors.splitlines()[0]
                cmd = ('git', 'rev-list', '--max-parents=0', local_sha)
                roots = set(subprocess.check_output(cmd).decode().splitlines())
                if first_ancestor in roots:
                    # pushing the whole tree including root commit
                    return _ns(
                        'pre-push', color,
                        all_files=True,
                        remote_name=remote_name, remote_url=remote_url,
                        remote_branch=remote_branch,
                        local_branch=local_branch,
                    )
                else:
                    rev_cmd = ('git', 'rev-parse', f'{first_ancestor}^')
                    source = subprocess.check_output(rev_cmd).decode().strip()
                    return _ns(
                        'pre-push', color,
                        from_ref=source, to_ref=local_sha,
                        remote_name=remote_name, remote_url=remote_url,
                        remote_branch=remote_branch,
                        local_branch=local_branch,
                    )

# nothing to push
    return None

_EXPECTED_ARG_LENGTH_BY_HOOK = {
    'commit-msg': 1,
    'post-checkout': 3,
    'post-commit': 0,
    'pre-commit': 0,
    'pre-merge-commit': 0,
    'post-merge': 1,
    'post-rewrite': 1,
    'pre-push': 2,
}

def _check_args_length(hook_type: str, args: Sequence[str]) -> None:
    if hook_type == 'prepare-commit-msg':
        if len(args) < 1 or len(args) > 3:
            raise SystemExit(
                f'hook-impl for {hook_type} expected 1, 2, or 3 arguments '
                f'but got {len(args)}: {args}',
            )
    elif hook_type == 'pre-rebase':
        if len(args) < 1 or len(args) > 2:
            raise SystemExit(
                f'hook-impl for {hook_type} expected 1 or 2 arguments '
                f'but got {len(args)}: {args}',
            )
    elif hook_type in _EXPECTED_ARG_LENGTH_BY_HOOK:
        expected = _EXPECTED_ARG_LENGTH_BY_HOOK[hook_type]
        if len(args) != expected:
            arguments_s = 'argument' if expected == 1 else 'arguments'
            raise SystemExit(
                f'hook-impl for {hook_type} expected {expected} {arguments_s} '
                f'but got {len(args)}: {args}',
            )
    else:
        raise AssertionError(f'unexpected hook type: {hook_type}')

def _run_ns(
        hook_type: str,
        color: bool,
        args: Sequence[str],
        stdin: bytes,
) -> argparse.Namespace | None:
    _check_args_length(hook_type, args)
    if hook_type == 'pre-push':
        return _pre_push_ns(color, args, stdin)
    elif hook_type in 'commit-msg':
        return _ns(hook_type, color, commit_msg_filename=args[0])
    elif hook_type == 'prepare-commit-msg' and len(args) == 1:
        return _ns(hook_type, color, commit_msg_filename=args[0])
    elif hook_type == 'prepare-commit-msg' and len(args) == 2:
        return _ns(
            hook_type, color, commit_msg_filename=args[0],
            prepare_commit_message_source=args[1],
        )
    elif hook_type == 'prepare-commit-msg' and len(args) == 3:
        return _ns(
            hook_type, color, commit_msg_filename=args[0],
            prepare_commit_message_source=args[1], commit_object_name=args[2],
        )
    elif hook_type in {'post-commit', 'pre-merge-commit', 'pre-commit'}:
        return _ns(hook_type, color)
    elif hook_type == 'post-checkout':
        return _ns(
            hook_type, color,
            from_ref=args[0], to_ref=args[1], checkout_type=args[2],
        )
    elif hook_type == 'post-merge':
        return _ns(hook_type, color, is_squash_merge=args[0])
    elif hook_type == 'post-rewrite':
        return _ns(hook_type, color, rewrite_command=args[0])
    elif hook_type == 'pre-rebase' and len(args) == 1:
        return _ns(hook_type, color, pre_rebase_upstream=args[0])
    elif hook_type == 'pre-rebase' and len(args) == 2:
        return _ns(
            hook_type, color, pre_rebase_upstream=args[0],
            pre_rebase_branch=args[1],
        )
    else:
        raise AssertionError(f'unexpected hook type: {hook_type}')

def hook_impl(
        store: Store,
        *,
        config: str,
        color: bool,
        hook_type: str,
        hook_dir: str,
        skip_on_missing_config: bool,
        args: Sequence[str],
) -> int:
    retv, stdin = _run_legacy(hook_type, hook_dir, args)
    _validate_config(retv, config, skip_on_missing_config)
    ns = _run_ns(hook_type, color, args, stdin)
    if ns is None:
        return retv
    else:
        return retv | run(config, store, ns)

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✍️ Editing: hook_impl.py

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