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import hashlib
import os
from typing import Sequence
from typing import Tuple
import pre_commit.constants as C
from pre_commit.hook import Hook
from pre_commit.languages import helpers
from pre_commit.prefix import Prefix
from pre_commit.util import CalledProcessError
from pre_commit.util import clean_path_on_failure
from pre_commit.util import cmd_output_b
ENVIRONMENT_DIR = 'docker'
PRE_COMMIT_LABEL = 'PRE_COMMIT'
get_default_version = helpers.basic_get_default_version
healthy = helpers.basic_healthy
def md5(s: str) -> str: # pragma: win32 no cover
return hashlib.md5(s.encode()).hexdigest()
def docker_tag(prefix: Prefix) -> str: # pragma: win32 no cover
md5sum = md5(os.path.basename(prefix.prefix_dir)).lower()
return f'pre-commit-{md5sum}'
def docker_is_running() -> bool: # pragma: win32 no cover
try:
cmd_output_b('docker', 'ps')
except CalledProcessError:
return False
else:
return True
def assert_docker_available() -> None: # pragma: win32 no cover
assert docker_is_running(), (
'Docker is either not running or not configured in this environment'
)
def build_docker_image(
prefix: Prefix,
*,
pull: bool,
) -> None: # pragma: win32 no cover
cmd: Tuple[str, ...] = (
'docker', 'build',
'--tag', docker_tag(prefix),
'--label', PRE_COMMIT_LABEL,
)
if pull:
cmd += ('--pull',)
# This must come last for old versions of docker. See #477
cmd += ('.',)
helpers.run_setup_cmd(prefix, cmd)
def install_environment(
prefix: Prefix, version: str, additional_dependencies: Sequence[str],
) -> None: # pragma: win32 no cover
helpers.assert_version_default('docker', version)
helpers.assert_no_additional_deps('docker', additional_dependencies)
assert_docker_available()
directory = prefix.path(
helpers.environment_dir(ENVIRONMENT_DIR, C.DEFAULT),
)
# Docker doesn't really have relevant disk environment, but pre-commit
# still needs to cleanup its state files on failure
with clean_path_on_failure(directory):
build_docker_image(prefix, pull=True)
os.mkdir(directory)
def get_docker_user() -> Tuple[str, ...]: # pragma: win32 no cover
try:
return ('-u', f'{os.getuid()}:{os.getgid()}')
except AttributeError:
return ()
def docker_cmd() -> Tuple[str, ...]: # pragma: win32 no cover
return (
'docker', 'run',
'--rm',
*get_docker_user(),
# https://docs.docker.com/engine/reference/commandline/run/#mount-volumes-from-container-volumes-from
# The `Z` option tells Docker to label the content with a private
# unshared label. Only the current container can use a private volume.
'-v', f'{os.getcwd()}:/src:rw,Z',
'--workdir', '/src',
)
def run_hook(
hook: Hook,
file_args: Sequence[str],
color: bool,
) -> Tuple[int, bytes]: # pragma: win32 no cover
assert_docker_available()
# Rebuild the docker image in case it has gone missing, as many people do
# automated cleanup of docker images.
build_docker_image(hook.prefix, pull=False)
hook_cmd = hook.cmd
entry_exe, cmd_rest = hook.cmd[0], hook_cmd[1:]
entry_tag = ('--entrypoint', entry_exe, docker_tag(hook.prefix))
cmd = docker_cmd() + entry_tag + cmd_rest
return helpers.run_xargs(hook, cmd, file_args, color=color)
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