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import logging
import os.path
import sys
from typing import Dict
from typing import List
from typing import MutableMapping
from typing import Optional
from typing import Set
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__)
def zsplit(s: str) -> List[str]:
s = s.strip('\0')
if s:
return s.split('\0')
else:
return []
def no_git_env(
_env: Optional[MutableMapping[str, str]] = 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 in {
'GIT_EXEC_PATH', 'GIT_SSH', 'GIT_SSH_COMMAND', 'GIT_SSL_CAINFO',
'GIT_SSL_NO_VERIFY',
}
}
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(),
)
git_dir = os.path.abspath(get_git_dir())
except CalledProcessError:
raise FatalError(
'git failed. Is it installed, and are you in a Git repository '
'directory?',
)
if os.path.samefile(root, git_dir):
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:
opts = ('--git-common-dir', '--git-dir')
_, out, _ = cmd_output('git', 'rev-parse', *opts, cwd=git_root)
for line, opt in zip(out.splitlines(), opts):
if line != opt: # pragma: no branch (git < 2.5)
return os.path.normpath(os.path.join(git_root, line))
else:
raise AssertionError('unreachable: no git dir')
def get_remote_url(git_root: str) -> str:
_, out, _ = cmd_output('git', 'config', 'remote.origin.url', cwd=git_root)
return out.strip()
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: Optional[str] = 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', 'status', '--ignore-submodules', '--porcelain', '-z',
)
parts = list(reversed(zsplit(stdout)))
intent_to_add = []
while parts:
line = parts.pop()
status, filename = line[:3], line[3:]
if status[0] in {'C', 'R'}: # renames / moves have an additional arg
parts.pop()
if status[1] == 'A':
intent_to_add.append(filename)
return intent_to_add
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, retcode=None)[0] == 1
def has_core_hookpaths_set() -> bool:
_, out, _ = cmd_output_b('git', 'config', 'core.hooksPath', retcode=None)
return bool(out.strip())
def init_repo(path: str, remote: str) -> None:
if os.path.isdir(remote):
remote = os.path.abspath(remote)
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',
)
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