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from __future__ import annotations
import contextlib
import logging
import os.path
import time
from collections.abc import Generator
from pre_commit import git
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
from pre_commit.xargs import xargs
logger = logging.getLogger('pre_commit')
# without forcing submodule.recurse=0, changes in nested submodules will be
# discarded if `submodule.recurse=1` is configured
# we choose this instead of `--no-recurse-submodules` because it works on
# versions of git before that option was added to `git checkout`
_CHECKOUT_CMD = ('git', '-c', 'submodule.recurse=0', 'checkout', '--', '.')
def _git_apply(patch: str) -> None:
args = ('apply', '--whitespace=nowarn', patch)
try:
cmd_output_b('git', *args)
except CalledProcessError:
# Retry with autocrlf=false -- see #570
cmd_output_b('git', '-c', 'core.autocrlf=false', *args)
@contextlib.contextmanager
def _intent_to_add_cleared() -> Generator[None]:
intent_to_add = git.intent_to_add_files()
if intent_to_add:
logger.warning('Unstaged intent-to-add files detected.')
xargs(('git', 'rm', '--cached', '--'), intent_to_add)
try:
yield
finally:
xargs(('git', 'add', '--intent-to-add', '--'), intent_to_add)
else:
yield
@contextlib.contextmanager
def _unstaged_changes_cleared(patch_dir: str) -> Generator[None]:
tree = cmd_output('git', 'write-tree')[1].strip()
diff_cmd = (
'git', 'diff-index', '--ignore-submodules', '--binary',
'--exit-code', '--no-color', '--no-ext-diff', tree, '--',
)
retcode, diff_stdout, diff_stderr = cmd_output_b(*diff_cmd, check=False)
if retcode == 0:
# There weren't any staged files so we don't need to do anything
# special
yield
elif retcode == 1 and not diff_stdout.strip():
# due to behaviour (probably a bug?) in git with crlf endings and
# autocrlf set to either `true` or `input` sometimes git will refuse
# to show a crlf-only diff to us :(
yield
elif retcode == 1 and diff_stdout.strip():
patch_filename = f'patch{int(time.time())}-{os.getpid()}'
patch_filename = os.path.join(patch_dir, patch_filename)
logger.warning('Unstaged files detected.')
logger.info(f'Stashing unstaged files to {patch_filename}.')
# Save the current unstaged changes as a patch
os.makedirs(patch_dir, exist_ok=True)
with open(patch_filename, 'wb') as patch_file:
patch_file.write(diff_stdout)
# prevent recursive post-checkout hooks (#1418)
no_checkout_env = dict(os.environ, _PRE_COMMIT_SKIP_POST_CHECKOUT='1')
try:
cmd_output_b(*_CHECKOUT_CMD, env=no_checkout_env)
yield
finally:
# Try to apply the patch we saved
try:
_git_apply(patch_filename)
except CalledProcessError:
logger.warning(
'Stashed changes conflicted with hook auto-fixes... '
'Rolling back fixes...',
)
# We failed to apply the patch, presumably due to fixes made
# by hooks.
# Roll back the changes made by hooks.
cmd_output_b(*_CHECKOUT_CMD, env=no_checkout_env)
_git_apply(patch_filename)
logger.info(f'Restored changes from {patch_filename}.')
else: # pragma: win32 no cover
# some error occurred while requesting the diff
e = CalledProcessError(retcode, diff_cmd, b'', diff_stderr)
raise FatalError(
f'pre-commit failed to diff -- perhaps due to permissions?\n\n{e}',
)
@contextlib.contextmanager
def staged_files_only(patch_dir: str) -> Generator[None]:
"""Clear any unstaged changes from the git working directory inside this
context.
"""
with _intent_to_add_cleared(), _unstaged_changes_cleared(patch_dir):
yield
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