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from __future__ import absolute_import

from __future__ import unicode_literals

import hashlib

import os

from pre_commit import five

from pre_commit.languages import helpers

from pre_commit.util import CalledProcessError

from pre_commit.util import clean_path_on_failure

from pre_commit.util import cmd_output

from pre_commit.xargs import xargs

ENVIRONMENT_DIR = 'docker'

PRE_COMMIT_LABEL = 'PRE_COMMIT'

get_default_version = helpers.basic_get_default_version

healthy = helpers.basic_healthy

def md5(s): # pragma: windows no cover

return hashlib.md5(five.to_bytes(s)).hexdigest()

def docker_tag(prefix): # pragma: windows no cover

md5sum = md5(os.path.basename(prefix.prefix_dir)).lower()

return 'pre-commit-{}'.format(md5sum)

def docker_is_running(): # pragma: windows no cover

try:

return cmd_output('docker', 'ps')[0] == 0

except CalledProcessError:

return False

def assert_docker_available(): # pragma: windows no cover

assert docker_is_running(), (

'Docker is either not running or not configured in this environment'

)

def build_docker_image(prefix, **kwargs): # pragma: windows no cover

pull = kwargs.pop('pull')

assert not kwargs, kwargs

cmd = (

'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, version, additional_dependencies,

): # pragma: windows 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, 'default'),

)

# Docker doesn't really have relevant disk environment, but pre-commit

# still needs to cleanup it's state files on failure

with clean_path_on_failure(directory):

build_docker_image(prefix, pull=True)

os.mkdir(directory)

def docker_cmd():

return (

'docker', 'run',

'--rm',

'-u', '{}:{}'.format(os.getuid(), os.getgid()),

# 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', '{}:/src:rw,Z'.format(os.getcwd()),

'--workdir', '/src',

)

def run_hook(prefix, hook, file_args): # pragma: windows 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(prefix, pull=False)

hook_cmd = helpers.to_cmd(hook)

entry_exe, cmd_rest = hook_cmd[0], hook_cmd[1:]

entry_tag = ('--entrypoint', entry_exe, docker_tag(prefix))

cmd = docker_cmd() + entry_tag + cmd_rest

return xargs(cmd, file_args)

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