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219 lines (180 loc) · 7.62 KB
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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 clean_path_on_failure
from pre_commit.util import cmd_output
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 clone(self, repo, ref, deps=()):
"""Clone the given url and checkout the specific ref."""
def clone_strategy(directory):
env = git.no_git_env()
cmd = ('git', 'clone', '--no-checkout', repo, directory)
cmd_output(*cmd, env=env)
def _git_cmd(*args):
return cmd_output('git', *args, cwd=directory, env=env)
_git_cmd('reset', ref, '--hard')
_git_cmd('submodule', 'update', '--init', '--recursive')
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('git', *args, cwd=directory, env=env)
_git_cmd('init', '.')
_git_cmd('config', 'remote.origin.url', '<<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)
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