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from __future__ import unicode_literals

import contextlib

import io

import logging

import os.path

import sqlite3

import tempfile

from cached_property import cached_property

from pre_commit.prefixed_command_runner import PrefixedCommandRunner

from pre_commit.util import clean_path_on_failure

from pre_commit.util import cmd_output

from pre_commit.util import cwd

from pre_commit.util import no_git_env

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',

os.path.join(os.path.expanduser('~'), '.pre-commit'),

)

class Store(object):

get_default_directory = staticmethod(_get_default_directory)

class RepoPathGetter(object):

def __init__(self, repo, sha, store):

self._repo = repo

self._sha = sha

self._store = store

@cached_property

def repo_path(self):

return self._store.clone(self._repo, self._sha)

def __init__(self, directory=None):

if directory is None:

directory = self.get_default_directory()

self.directory = directory

self.__created = False

def _write_readme(self):

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

readme.write(

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

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

)

def _write_sqlite_db(self):

# 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)

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

# contextlib.closing fixes this.

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

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

db.executescript(

'CREATE TABLE repos ('

' repo CHAR(255) NOT NULL,'

' ref CHAR(255) NOT NULL,'

' path CHAR(255) NOT NULL,'

' PRIMARY KEY (repo, ref)'

');'

)

# Atomic file move

os.rename(tmpfile, self.db_path)

def _create(self):

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

return

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

os.makedirs(self.directory)

self._write_readme()

self._write_sqlite_db()

def require_created(self):

"""Require the pre-commit file store to be created."""

if self.__created:

return

self._create()

self.__created = True

def clone(self, url, sha):

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

self.require_created()

# Check if we already exist

with sqlite3.connect(self.db_path) as db:

result = db.execute(

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

[url, sha],

).fetchone()

if result:

return result[0]

logger.info('Initializing environment for {}.'.format(url))

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

with clean_path_on_failure(dir):

cmd_output(

'git', 'clone', '--no-checkout', url, dir, env=no_git_env(),

)

with cwd(dir):

cmd_output('git', 'reset', sha, '--hard', env=no_git_env())

# Update our db with the created repo

with sqlite3.connect(self.db_path) as db:

db.execute(

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

[url, sha, dir],

)

return dir

def get_repo_path_getter(self, repo, sha):

return self.RepoPathGetter(repo, sha, self)

@cached_property

def cmd_runner(self):

return PrefixedCommandRunner(self.directory)

@cached_property

def db_path(self):

return os.path.join(self.directory, 'db.db')

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