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repository.py
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from __future__ import unicode_literals
import collections
import io
import json
import logging
import os
import shlex
import pre_commit.constants as C
from pre_commit import five
from pre_commit.clientlib import load_manifest
from pre_commit.clientlib import LOCAL
from pre_commit.clientlib import MANIFEST_HOOK_DICT
from pre_commit.clientlib import META
from pre_commit.languages.all import languages
from pre_commit.languages.helpers import environment_dir
from pre_commit.prefix import Prefix
from pre_commit.util import parse_version
from pre_commit.util import rmtree
logger = logging.getLogger('pre_commit')
def _state(additional_deps):
return {'additional_dependencies': sorted(additional_deps)}
def _state_filename(prefix, venv):
return prefix.path(venv, '.install_state_v' + C.INSTALLED_STATE_VERSION)
def _read_state(prefix, venv):
filename = _state_filename(prefix, venv)
if not os.path.exists(filename):
return None
else:
with io.open(filename) as f:
return json.load(f)
def _write_state(prefix, venv, state):
state_filename = _state_filename(prefix, venv)
staging = state_filename + 'staging'
with io.open(staging, 'w') as state_file:
state_file.write(five.to_text(json.dumps(state)))
# Move the file into place atomically to indicate we've installed
os.rename(staging, state_filename)
_KEYS = tuple(item.key for item in MANIFEST_HOOK_DICT.items)
class Hook(collections.namedtuple('Hook', ('src', 'prefix') + _KEYS)):
__slots__ = ()
@property
def cmd(self):
return tuple(shlex.split(self.entry)) + tuple(self.args)
@property
def install_key(self):
return (
self.prefix,
self.language,
self.language_version,
tuple(self.additional_dependencies),
)
def installed(self):
lang = languages[self.language]
venv = environment_dir(lang.ENVIRONMENT_DIR, self.language_version)
return (
venv is None or (
(
_read_state(self.prefix, venv) ==
_state(self.additional_dependencies)
) and
lang.healthy(self.prefix, self.language_version)
)
)
def install(self):
logger.info('Installing environment for {}.'.format(self.src))
logger.info('Once installed this environment will be reused.')
logger.info('This may take a few minutes...')
lang = languages[self.language]
venv = environment_dir(lang.ENVIRONMENT_DIR, self.language_version)
# There's potentially incomplete cleanup from previous runs
# Clean it up!
if self.prefix.exists(venv):
rmtree(self.prefix.path(venv))
lang.install_environment(
self.prefix, self.language_version, self.additional_dependencies,
)
# Write our state to indicate we're installed
_write_state(self.prefix, venv, _state(self.additional_dependencies))
def run(self, file_args, color, progress):
lang = languages[self.language]
return lang.run_hook(self, file_args, color, progress)
@classmethod
def create(cls, src, prefix, dct):
# TODO: have cfgv do this (?)
extra_keys = set(dct) - set(_KEYS)
if extra_keys:
logger.warning(
'Unexpected key(s) present on {} => {}: '
'{}'.format(src, dct['id'], ', '.join(sorted(extra_keys))),
)
return cls(src=src, prefix=prefix, **{k: dct[k] for k in _KEYS})
def _hook(*hook_dicts, **kwargs):
root_config = kwargs.pop('root_config')
assert not kwargs, kwargs
ret, rest = dict(hook_dicts[0]), hook_dicts[1:]
for dct in rest:
ret.update(dct)
version = ret['minimum_pre_commit_version']
if parse_version(version) > parse_version(C.VERSION):
logger.error(
'The hook `{}` requires pre-commit version {} but version {} '
'is installed. '
'Perhaps run `pip install --upgrade pre-commit`.'.format(
ret['id'], version, C.VERSION,
),
)
exit(1)
lang = ret['language']
if ret['language_version'] == C.DEFAULT:
ret['language_version'] = root_config['default_language_version'][lang]
if ret['language_version'] == C.DEFAULT:
ret['language_version'] = languages[lang].get_default_version()
if not ret['stages']:
ret['stages'] = root_config['default_stages']
return ret
def _non_cloned_repository_hooks(repo_config, store, root_config):
def _prefix(language_name, deps):
language = languages[language_name]
# pcre / pygrep / script / system / docker_image do not have
# environments so they work out of the current directory
if language.ENVIRONMENT_DIR is None:
return Prefix(os.getcwd())
else:
return Prefix(store.make_local(deps))
return tuple(
Hook.create(
repo_config['repo'],
_prefix(hook['language'], hook['additional_dependencies']),
_hook(hook, root_config=root_config),
)
for hook in repo_config['hooks']
)
def _cloned_repository_hooks(repo_config, store, root_config):
repo, rev = repo_config['repo'], repo_config['rev']
manifest_path = os.path.join(store.clone(repo, rev), C.MANIFEST_FILE)
by_id = {hook['id']: hook for hook in load_manifest(manifest_path)}
for hook in repo_config['hooks']:
if hook['id'] not in by_id:
logger.error(
'`{}` is not present in repository {}. '
'Typo? Perhaps it is introduced in a newer version? '
'Often `pre-commit autoupdate` fixes this.'
.format(hook['id'], repo),
)
exit(1)
hook_dcts = [
_hook(by_id[hook['id']], hook, root_config=root_config)
for hook in repo_config['hooks']
]
return tuple(
Hook.create(
repo_config['repo'],
Prefix(store.clone(repo, rev, hook['additional_dependencies'])),
hook,
)
for hook in hook_dcts
)
def _repository_hooks(repo_config, store, root_config):
if repo_config['repo'] in {LOCAL, META}:
return _non_cloned_repository_hooks(repo_config, store, root_config)
else:
return _cloned_repository_hooks(repo_config, store, root_config)
def install_hook_envs(hooks, store):
def _need_installed():
seen = set()
ret = []
for hook in hooks:
if hook.install_key not in seen and not hook.installed():
ret.append(hook)
seen.add(hook.install_key)
return ret
if not _need_installed():
return
with store.exclusive_lock():
# Another process may have already completed this work
for hook in _need_installed():
hook.install()
def all_hooks(root_config, store):
return tuple(
hook
for repo in root_config['repos']
for hook in _repository_hooks(repo, store, root_config)
)