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import itertools
import logging
import os.path
import shutil
import sys
from typing import Optional
from typing import Sequence
from typing import Tuple
from pre_commit import git
from pre_commit import output
from pre_commit.clientlib import load_config
from pre_commit.repository import all_hooks
from pre_commit.repository import install_hook_envs
from pre_commit.store import Store
from pre_commit.util import make_executable
from pre_commit.util import resource_text
logger = logging.getLogger(__name__)
# This is used to identify the hook file we install
PRIOR_HASHES = (
b'4d9958c90bc262f47553e2c073f14cfe',
b'd8ee923c46731b42cd95cc869add4062',
b'49fd668cb42069aa1b6048464be5d395',
b'79f09a650522a87b0da915d0d983b2de',
b'e358c9dae00eac5d06b38dfdb1e33a8c',
)
CURRENT_HASH = b'138fd403232d2ddd5efb44317e38bf03'
TEMPLATE_START = '# start templated\n'
TEMPLATE_END = '# end templated\n'
# Homebrew/homebrew-core#35825: be more timid about appropriate `PATH`
# #1312 os.defpath is too restrictive on BSD
POSIX_SEARCH_PATH = ('/usr/local/bin', '/usr/bin', '/bin')
SYS_EXE = os.path.basename(os.path.realpath(sys.executable))
def _hook_paths(
hook_type: str,
git_dir: Optional[str] = None,
) -> Tuple[str, str]:
git_dir = git_dir if git_dir is not None else git.get_git_dir()
pth = os.path.join(git_dir, 'hooks', hook_type)
return pth, f'{pth}.legacy'
def is_our_script(filename: str) -> bool:
if not os.path.exists(filename): # pragma: win32 no cover (symlink)
return False
with open(filename, 'rb') as f:
contents = f.read()
return any(h in contents for h in (CURRENT_HASH,) + PRIOR_HASHES)
def shebang() -> str:
if sys.platform == 'win32':
py, _ = os.path.splitext(SYS_EXE)
else:
exe_choices = [
f'python{sys.version_info[0]}.{sys.version_info[1]}',
f'python{sys.version_info[0]}',
]
# avoid searching for bare `python` as it's likely to be python 2
if SYS_EXE != 'python':
exe_choices.append(SYS_EXE)
for path, exe in itertools.product(POSIX_SEARCH_PATH, exe_choices):
if os.access(os.path.join(path, exe), os.X_OK):
py = exe
break
else:
py = SYS_EXE
return f'#!/usr/bin/env {py}'
def _install_hook_script(
config_file: str,
hook_type: str,
overwrite: bool = False,
skip_on_missing_config: bool = False,
git_dir: Optional[str] = None,
) -> None:
hook_path, legacy_path = _hook_paths(hook_type, git_dir=git_dir)
os.makedirs(os.path.dirname(hook_path), exist_ok=True)
# If we have an existing hook, move it to pre-commit.legacy
if os.path.lexists(hook_path) and not is_our_script(hook_path):
shutil.move(hook_path, legacy_path)
# If we specify overwrite, we simply delete the legacy file
if overwrite and os.path.exists(legacy_path):
os.remove(legacy_path)
elif os.path.exists(legacy_path):
output.write_line(
f'Running in migration mode with existing hooks at {legacy_path}\n'
f'Use -f to use only pre-commit.',
)
args = ['hook-impl', f'--config={config_file}', f'--hook-type={hook_type}']
if skip_on_missing_config:
args.append('--skip-on-missing-config')
params = {'INSTALL_PYTHON': sys.executable, 'ARGS': args}
with open(hook_path, 'w') as hook_file:
contents = resource_text('hook-tmpl')
before, rest = contents.split(TEMPLATE_START)
to_template, after = rest.split(TEMPLATE_END)
before = before.replace('#!/usr/bin/env python3', shebang())
hook_file.write(before + TEMPLATE_START)
for line in to_template.splitlines():
var = line.split()[0]
hook_file.write(f'{var} = {params[var]!r}\n')
hook_file.write(TEMPLATE_END + after)
make_executable(hook_path)
output.write_line(f'pre-commit installed at {hook_path}')
def install(
config_file: str,
store: Store,
hook_types: Sequence[str],
overwrite: bool = False,
hooks: bool = False,
skip_on_missing_config: bool = False,
git_dir: Optional[str] = None,
) -> int:
if git_dir is None and git.has_core_hookpaths_set():
logger.error(
'Cowardly refusing to install hooks with `core.hooksPath` set.\n'
'hint: `git config --unset-all core.hooksPath`',
)
return 1
for hook_type in hook_types:
_install_hook_script(
config_file, hook_type,
overwrite=overwrite,
skip_on_missing_config=skip_on_missing_config,
git_dir=git_dir,
)
if hooks:
install_hooks(config_file, store)
return 0
def install_hooks(config_file: str, store: Store) -> int:
install_hook_envs(all_hooks(load_config(config_file), store), store)
return 0
def _uninstall_hook_script(hook_type: str) -> None:
hook_path, legacy_path = _hook_paths(hook_type)
# If our file doesn't exist or it isn't ours, gtfo.
if not os.path.exists(hook_path) or not is_our_script(hook_path):
return
os.remove(hook_path)
output.write_line(f'{hook_type} uninstalled')
if os.path.exists(legacy_path):
os.replace(legacy_path, hook_path)
output.write_line(f'Restored previous hooks to {hook_path}')
def uninstall(hook_types: Sequence[str]) -> int:
for hook_type in hook_types:
_uninstall_hook_script(hook_type)
return 0
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