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from __future__ import annotations

import contextlib

import logging

import os.path

import sqlite3

import tempfile

from collections.abc import Callable

from collections.abc import Generator

from collections.abc import Sequence

import pre_commit.constants as C

from pre_commit import clientlib

from pre_commit import file_lock

from pre_commit import git

from pre_commit.util import CalledProcessError

from pre_commit.util import clean_path_on_failure

from pre_commit.util import cmd_output_b

from pre_commit.util import resource_text

logger = logging.getLogger('pre_commit')

def _get_default_directory() -> str:

"""Returns the default directory for the Store. This is intentionally

underscored to indicate that `Store.get_default_directory` is the intended

way to get this information. This is also done so

`Store.get_default_directory` can be mocked in tests and

`_get_default_directory` can be tested.

"""

ret = os.environ.get('PRE_COMMIT_HOME') or os.path.join(

os.environ.get('XDG_CACHE_HOME') or os.path.expanduser('~/.cache'),

'pre-commit',

)

return os.path.realpath(ret)

_LOCAL_RESOURCES = (

'Cargo.toml', 'main.go', 'go.mod', 'main.rs',

'pre-commit-package-dev-1.rockspec',

'pre_commit_placeholder_package.gemspec', 'setup.py',

'environment.yml', 'Makefile.PL', 'pubspec.yaml',

'renv.lock', 'renv/activate.R', 'renv/LICENSE.renv',

)

def _make_local_repo(directory: str) -> None:

for resource in _LOCAL_RESOURCES:

resource_dirname, resource_basename = os.path.split(resource)

contents = resource_text(f'empty_template_{resource_basename}')

target_dir = os.path.join(directory, resource_dirname)

target_file = os.path.join(target_dir, resource_basename)

os.makedirs(target_dir, exist_ok=True)

with open(target_file, 'w') as f:

f.write(contents)

class Store:

get_default_directory = staticmethod(_get_default_directory)

def __init__(self, directory: str | None = None) -> None:

self.directory = directory or Store.get_default_directory()

self.db_path = os.path.join(self.directory, 'db.db')

self.readonly = (

os.path.exists(self.directory) and

not os.access(self.directory, os.W_OK)

)

if not os.path.exists(self.directory):

os.makedirs(self.directory, exist_ok=True)

with open(os.path.join(self.directory, 'README'), 'w') as f:

f.write(

'This directory is maintained by the pre-commit project.\n'

'Learn more: https://github.com/pre-commit/pre-commit\n',

)

if os.path.exists(self.db_path):

return

with self.exclusive_lock():

# Another process may have already completed this work

if os.path.exists(self.db_path): # pragma: no cover (race)

return

# To avoid a race where someone ^Cs between db creation and

# execution of the CREATE TABLE statement

fd, tmpfile = tempfile.mkstemp(dir=self.directory)

# We'll be managing this file ourselves

os.close(fd)

with self.connect(db_path=tmpfile) as db:

db.executescript(

'CREATE TABLE repos ('

' repo TEXT NOT NULL,'

' ref TEXT NOT NULL,'

' path TEXT NOT NULL,'

' PRIMARY KEY (repo, ref)'

');',

)

self._create_configs_table(db)

# Atomic file move

os.replace(tmpfile, self.db_path)

@contextlib.contextmanager

def exclusive_lock(self) -> Generator[None]:

def blocked_cb() -> None: # pragma: no cover (tests are in-process)

logger.info('Locking pre-commit directory')

with file_lock.lock(os.path.join(self.directory, '.lock'), blocked_cb):

yield

@contextlib.contextmanager

def connect(

self,

db_path: str | None = None,

) -> Generator[sqlite3.Connection]:

db_path = db_path or self.db_path

# sqlite doesn't close its fd with its contextmanager >.<

# contextlib.closing fixes this.

# See: https://stackoverflow.com/a/28032829/812183

with contextlib.closing(sqlite3.connect(db_path)) as db:

# this creates a transaction

with db:

yield db

@classmethod

def db_repo_name(cls, repo: str, deps: Sequence[str]) -> str:

if deps:

return f'{repo}:{",".join(deps)}'

else:

return repo

def _new_repo(

self,

repo: str,

ref: str,

deps: Sequence[str],

make_strategy: Callable[[str], None],

) -> str:

original_repo = repo

repo = self.db_repo_name(repo, deps)

def _get_result() -> str | None:

# Check if we already exist

with self.connect() as db:

result = db.execute(

'SELECT path FROM repos WHERE repo = ? AND ref = ?',

(repo, ref),

).fetchone()

return result[0] if result else None

result = _get_result()

if result:

return result

with self.exclusive_lock():

# Another process may have already completed this work

result = _get_result()

if result: # pragma: no cover (race)

return result

logger.info(f'Initializing environment for {repo}.')

directory = tempfile.mkdtemp(prefix='repo', dir=self.directory)

with clean_path_on_failure(directory):

make_strategy(directory)

# Update our db with the created repo

with self.connect() as db:

db.execute(

'INSERT INTO repos (repo, ref, path) VALUES (?, ?, ?)',

[repo, ref, directory],

)

clientlib.warn_for_stages_on_repo_init(original_repo, directory)

return directory

def _complete_clone(self, ref: str, git_cmd: Callable[..., None]) -> None:

"""Perform a complete clone of a repository and its submodules """

git_cmd('fetch', 'origin', '--tags')

git_cmd('checkout', ref)

git_cmd('submodule', 'update', '--init', '--recursive')

def _shallow_clone(self, ref: str, git_cmd: Callable[..., None]) -> None:

"""Perform a shallow clone of a repository and its submodules """

git_config = 'protocol.version=2'

git_cmd('-c', git_config, 'fetch', 'origin', ref, '--depth=1')

git_cmd('checkout', 'FETCH_HEAD')

git_cmd(

'-c', git_config, 'submodule', 'update', '--init', '--recursive',

'--depth=1',

)

def clone(self, repo: str, ref: str, deps: Sequence[str] = ()) -> str:

"""Clone the given url and checkout the specific ref."""

def clone_strategy(directory: str) -> None:

git.init_repo(directory, repo)

env = git.no_git_env()

def _git_cmd(*args: str) -> None:

cmd_output_b('git', *args, cwd=directory, env=env)

try:

self._shallow_clone(ref, _git_cmd)

except CalledProcessError:

self._complete_clone(ref, _git_cmd)

return self._new_repo(repo, ref, deps, clone_strategy)

def make_local(self, deps: Sequence[str]) -> str:

return self._new_repo(

'local', C.LOCAL_REPO_VERSION, deps, _make_local_repo,

)

def _create_configs_table(self, db: sqlite3.Connection) -> None:

db.executescript(

'CREATE TABLE IF NOT EXISTS configs ('

' path TEXT NOT NULL,'

' PRIMARY KEY (path)'

');',

)

def mark_config_used(self, path: str) -> None:

if self.readonly: # pragma: win32 no cover

return

path = os.path.realpath(path)

# don't insert config files that do not exist

if not os.path.exists(path):

return

with self.connect() as db:

# TODO: eventually remove this and only create in _create

self._create_configs_table(db)

db.execute('INSERT OR IGNORE INTO configs VALUES (?)', (path,))

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