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pre_commit
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from __future__ import annotations import logging import os.path import sys from typing import Mapping from pre_commit.errors import FatalError from pre_commit.util import CalledProcessError from pre_commit.util import cmd_output from pre_commit.util import cmd_output_b logger = logging.getLogger(__name__) # see #2046 NO_FS_MONITOR = ('-c', 'core.useBuiltinFSMonitor=false') def zsplit(s: str) -> list[str]: s = s.strip('\0') if s: return s.split('\0') else: return [] def no_git_env(_env: Mapping[str, str] | None = None) -> dict[str, str]: # Too many bugs dealing with environment variables and GIT: # https://github.com/pre-commit/pre-commit/issues/300 # In git 2.6.3 (maybe others), git exports GIT_WORK_TREE while running # pre-commit hooks # In git 1.9.1 (maybe others), git exports GIT_DIR and GIT_INDEX_FILE # while running pre-commit hooks in submodules. # GIT_DIR: Causes git clone to clone wrong thing # GIT_INDEX_FILE: Causes 'error invalid object ...' during commit _env = _env if _env is not None else os.environ return { k: v for k, v in _env.items() if not k.startswith('GIT_') or k.startswith(('GIT_CONFIG_KEY_', 'GIT_CONFIG_VALUE_')) or k in { 'GIT_EXEC_PATH', 'GIT_SSH', 'GIT_SSH_COMMAND', 'GIT_SSL_CAINFO', 'GIT_SSL_NO_VERIFY', 'GIT_CONFIG_COUNT', 'GIT_HTTP_PROXY_AUTHMETHOD', 'GIT_ALLOW_PROTOCOL', 'GIT_ASKPASS', } } def get_root() -> str: # Git 2.25 introduced a change to "rev-parse --show-toplevel" that exposed # underlying volumes for Windows drives mapped with SUBST. We use # "rev-parse --show-cdup" to get the appropriate path, but must perform # an extra check to see if we are in the .git directory. try: root = os.path.abspath( cmd_output('git', 'rev-parse', '--show-cdup')[1].strip(), ) inside_git_dir = cmd_output( 'git', 'rev-parse', '--is-inside-git-dir', )[1].strip() except CalledProcessError: raise FatalError( 'git failed. Is it installed, and are you in a Git repository ' 'directory?', ) if inside_git_dir != 'false': raise FatalError( 'git toplevel unexpectedly empty! make sure you are not ' 'inside the `.git` directory of your repository.', ) return root def get_git_dir(git_root: str = '.') -> str: opt = '--git-dir' _, out, _ = cmd_output('git', 'rev-parse', opt, cwd=git_root) git_dir = out.strip() if git_dir != opt: return os.path.normpath(os.path.join(git_root, git_dir)) else: raise AssertionError('unreachable: no git dir') def get_git_common_dir(git_root: str = '.') -> str: opt = '--git-common-dir' _, out, _ = cmd_output('git', 'rev-parse', opt, cwd=git_root) git_common_dir = out.strip() if git_common_dir != opt: return os.path.normpath(os.path.join(git_root, git_common_dir)) else: # pragma: no cover (git < 2.5) return get_git_dir(git_root) def is_in_merge_conflict() -> bool: git_dir = get_git_dir('.') return ( os.path.exists(os.path.join(git_dir, 'MERGE_MSG')) and os.path.exists(os.path.join(git_dir, 'MERGE_HEAD')) ) def parse_merge_msg_for_conflicts(merge_msg: bytes) -> list[str]: # Conflicted files start with tabs return [ line.lstrip(b'#').strip().decode() for line in merge_msg.splitlines() # '#\t' for git 2.4.1 if line.startswith((b'\t', b'#\t')) ] def get_conflicted_files() -> set[str]: logger.info('Checking merge-conflict files only.') # Need to get the conflicted files from the MERGE_MSG because they could # have resolved the conflict by choosing one side or the other with open(os.path.join(get_git_dir('.'), 'MERGE_MSG'), 'rb') as f: merge_msg = f.read() merge_conflict_filenames = parse_merge_msg_for_conflicts(merge_msg) # This will get the rest of the changes made after the merge. # If they resolved the merge conflict by choosing a mesh of both sides # this will also include the conflicted files tree_hash = cmd_output('git', 'write-tree')[1].strip() merge_diff_filenames = zsplit( cmd_output( 'git', 'diff', '--name-only', '--no-ext-diff', '-z', '-m', tree_hash, 'HEAD', 'MERGE_HEAD', )[1], ) return set(merge_conflict_filenames) | set(merge_diff_filenames) def get_staged_files(cwd: str | None = None) -> list[str]: return zsplit( cmd_output( 'git', 'diff', '--staged', '--name-only', '--no-ext-diff', '-z', # Everything except for D '--diff-filter=ACMRTUXB', cwd=cwd, )[1], ) def intent_to_add_files() -> list[str]: _, stdout, _ = cmd_output( 'git', 'diff', '--no-ext-diff', '--ignore-submodules', '--diff-filter=A', '--name-only', '-z', ) return zsplit(stdout) def get_all_files() -> list[str]: return zsplit(cmd_output('git', 'ls-files', '-z')[1]) def get_changed_files(old: str, new: str) -> list[str]: diff_cmd = ('git', 'diff', '--name-only', '--no-ext-diff', '-z') try: _, out, _ = cmd_output(*diff_cmd, f'{old}...{new}') except CalledProcessError: # pragma: no cover (new git) # on newer git where old and new do not have a merge base git fails # so we try a full diff (this is what old git did for us!) _, out, _ = cmd_output(*diff_cmd, f'{old}..{new}') return zsplit(out) def head_rev(remote: str) -> str: _, out, _ = cmd_output('git', 'ls-remote', '--exit-code', remote, 'HEAD') return out.split()[0] def has_diff(*args: str, repo: str = '.') -> bool: cmd = ('git', 'diff', '--quiet', '--no-ext-diff', *args) return cmd_output_b(*cmd, cwd=repo, check=False)[0] == 1 def has_core_hookpaths_set() -> bool: _, out, _ = cmd_output_b('git', 'config', 'core.hooksPath', check=False) return bool(out.strip()) def init_repo(path: str, remote: str) -> None: if os.path.isdir(remote): remote = os.path.abspath(remote) git = ('git', *NO_FS_MONITOR) env = no_git_env() # avoid the user's template so that hooks do not recurse cmd_output_b(*git, 'init', '--template=', path, env=env) cmd_output_b(*git, 'remote', 'add', 'origin', remote, cwd=path, env=env) def commit(repo: str = '.') -> None: env = no_git_env() name, email = 'pre-commit', 'asottile+pre-commit@umich.edu' env['GIT_AUTHOR_NAME'] = env['GIT_COMMITTER_NAME'] = name env['GIT_AUTHOR_EMAIL'] = env['GIT_COMMITTER_EMAIL'] = email cmd = ('git', 'commit', '--no-edit', '--no-gpg-sign', '-n', '-minit') cmd_output_b(*cmd, cwd=repo, env=env) def git_path(name: str, repo: str = '.') -> str: _, out, _ = cmd_output('git', 'rev-parse', '--git-path', name, cwd=repo) return os.path.join(repo, out.strip()) def check_for_cygwin_mismatch() -> None: """See https://github.com/pre-commit/pre-commit/issues/354""" if sys.platform in ('cygwin', 'win32'): # pragma: no cover (windows) is_cygwin_python = sys.platform == 'cygwin' try: toplevel = get_root() except FatalError: # skip the check if we're not in a git repo return is_cygwin_git = toplevel.startswith('/') if is_cygwin_python ^ is_cygwin_git: exe_type = {True: '(cygwin)', False: '(windows)'} logger.warn( f'pre-commit has detected a mix of cygwin python / git\n' f'This combination is not supported, it is likely you will ' f'receive an error later in the program.\n' f'Make sure to use cygwin git+python while using cygwin\n' f'These can be installed through the cygwin installer.\n' f' - python {exe_type[is_cygwin_python]}\n' f' - git {exe_type[is_cygwin_git]}\n', ) def get_best_candidate_tag(rev: str, git_repo: str) -> str: """Get the best tag candidate. Multiple tags can exist on a SHA. Sometimes a moving tag is attached to a version tag. Try to pick the tag that looks like a version. """ tags = cmd_output( 'git', *NO_FS_MONITOR, 'tag', '--points-at', rev, cwd=git_repo, )[1].splitlines() for tag in tags: if '.' in tag: return tag return rev
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