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from __future__ import absolute_import

from __future__ import unicode_literals

import os.path

import pre_commit.constants as C

from pre_commit import output

from pre_commit.clientlib import InvalidConfigError

from pre_commit.clientlib import InvalidManifestError

from pre_commit.clientlib import load_config

from pre_commit.clientlib import load_manifest

from pre_commit.clientlib import LOCAL

from pre_commit.clientlib import META

def _mark_used_repos(store, all_repos, unused_repos, repo):

if repo['repo'] == META:

return

elif repo['repo'] == LOCAL:

for hook in repo['hooks']:

deps = hook.get('additional_dependencies')

unused_repos.discard((

store.db_repo_name(repo['repo'], deps), C.LOCAL_REPO_VERSION,

))

else:

key = (repo['repo'], repo['rev'])

path = all_repos.get(key)

# can't inspect manifest if it isn't cloned

if path is None:

return

try:

manifest = load_manifest(os.path.join(path, C.MANIFEST_FILE))

except InvalidManifestError:

return

else:

unused_repos.discard(key)

by_id = {hook['id']: hook for hook in manifest}

for hook in repo['hooks']:

if hook['id'] not in by_id:

continue

deps = hook.get(

'additional_dependencies',

by_id[hook['id']]['additional_dependencies'],

)

unused_repos.discard((

store.db_repo_name(repo['repo'], deps), repo['rev'],

))

def _gc_repos(store):

configs = store.select_all_configs()

repos = store.select_all_repos()

# delete config paths which do not exist

dead_configs = [p for p in configs if not os.path.exists(p)]

live_configs = [p for p in configs if os.path.exists(p)]

all_repos = {(repo, ref): path for repo, ref, path in repos}

unused_repos = set(all_repos)

for config_path in live_configs:

try:

config = load_config(config_path)

except InvalidConfigError:

dead_configs.append(config_path)

continue

else:

for repo in config['repos']:

_mark_used_repos(store, all_repos, unused_repos, repo)

store.delete_configs(dead_configs)

for db_repo_name, ref in unused_repos:

store.delete_repo(db_repo_name, ref, all_repos[(db_repo_name, ref)])

return len(unused_repos)

def gc(store):

with store.exclusive_lock():

repos_removed = _gc_repos(store)

output.write_line('{} repo(s) removed.'.format(repos_removed))

return 0

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