pre-commit/pre_commit/store.py at wip_progress_dots · pre-commit/pre-commit · GitHub

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from __future__ import unicode_literals

import contextlib

import io

import logging

import os.path

import sqlite3

import tempfile

import pre_commit.constants as C

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

from pre_commit.util import rmtree

logger = logging.getLogger('pre_commit')

def _get_default_directory():

"""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.

"""

return os.environ.get('PRE_COMMIT_HOME') or os.path.join(

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

'pre-commit',

)

class Store(object):

get_default_directory = staticmethod(_get_default_directory)

def __init__(self, directory=None):

self.directory = directory or Store.get_default_directory()

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

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

os.makedirs(self.directory)

with io.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_config_table_if_not_exists(db)

# Atomic file move

os.rename(tmpfile, self.db_path)

@contextlib.contextmanager

def exclusive_lock(self):

def blocked_cb(): # pragma: no cover (tests are single-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=None):

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, deps):

if deps:

return '{}:{}'.format(repo, ','.join(sorted(deps)))

else:

return repo

def _new_repo(self, repo, ref, deps, make_strategy):

repo = self.db_repo_name(repo, deps)

def _get_result():

# Check if we already exist

with self.connect() as db:

result = db.execute(

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

(repo, ref),

).fetchone()

if result:

return result[0]

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('Initializing environment for {}.'.format(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],

)

return directory

def _complete_clone(self, ref, git_cmd):

"""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, git_cmd):

"""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, ref, deps=()):

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

def clone_strategy(directory):

git.init_repo(directory, repo)

env = git.no_git_env()

def _git_cmd(*args):

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)

LOCAL_RESOURCES = (

'Cargo.toml', 'main.go', 'main.rs', '.npmignore', 'package.json',

'pre_commit_dummy_package.gemspec', 'setup.py',

)

def make_local(self, deps):

def make_local_strategy(directory):

for resource in self.LOCAL_RESOURCES:

contents = resource_text('empty_template_{}'.format(resource))

with io.open(os.path.join(directory, resource), 'w') as f:

f.write(contents)

env = git.no_git_env()

# initialize the git repository so it looks more like cloned repos

def _git_cmd(*args):

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

git.init_repo(directory, '<<unknown>>')

_git_cmd('add', '.')

git.commit(repo=directory)

return self._new_repo(

'local', C.LOCAL_REPO_VERSION, deps, make_local_strategy,

)

def _create_config_table_if_not_exists(self, db):

db.executescript(

'CREATE TABLE IF NOT EXISTS configs ('

' path TEXT NOT NULL,'

' PRIMARY KEY (path)'

');',

)

def mark_config_used(self, path):

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_config_table_if_not_exists(db)

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

def select_all_configs(self):

with self.connect() as db:

self._create_config_table_if_not_exists(db)

rows = db.execute('SELECT path FROM configs').fetchall()

return [path for path, in rows]

def delete_configs(self, configs):

with self.connect() as db:

rows = [(path,) for path in configs]

db.executemany('DELETE FROM configs WHERE path = ?', rows)

def select_all_repos(self):

with self.connect() as db:

return db.execute('SELECT repo, ref, path from repos').fetchall()

def delete_repo(self, db_repo_name, ref, path):

with self.connect() as db:

db.execute(

'DELETE FROM repos WHERE repo = ? and ref = ?',

(db_repo_name, ref),

)

rmtree(path)

pre-commit/pre_commit/store.py at wip_progress_dots · pre-commit/pre-commit · GitHub

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