mirror of https://github.com/docker/docs.git
516 lines
14 KiB
Python
516 lines
14 KiB
Python
import logging
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import os
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import sys
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import yaml
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from collections import namedtuple
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import six
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from compose.cli.utils import find_candidates_in_parent_dirs
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from .interpolation import interpolate_environment_variables
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from .errors import (
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ConfigurationError,
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CircularReference,
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ComposeFileNotFound,
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)
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from .validation import validate_against_schema
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DOCKER_CONFIG_KEYS = [
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'cap_add',
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'cap_drop',
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'cpu_shares',
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'cpuset',
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'command',
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'detach',
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'devices',
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'dns',
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'dns_search',
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'domainname',
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'entrypoint',
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'env_file',
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'environment',
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'extra_hosts',
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'hostname',
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'image',
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'labels',
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'links',
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'mac_address',
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'mem_limit',
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'memswap_limit',
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'net',
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'log_driver',
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'log_opt',
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'pid',
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'ports',
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'privileged',
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'read_only',
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'restart',
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'security_opt',
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'stdin_open',
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'tty',
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'user',
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'volume_driver',
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'volumes',
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'volumes_from',
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'working_dir',
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]
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ALLOWED_KEYS = DOCKER_CONFIG_KEYS + [
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'build',
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'container_name',
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'dockerfile',
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'expose',
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'external_links',
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'name',
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]
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SUPPORTED_FILENAMES = [
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'docker-compose.yml',
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'docker-compose.yaml',
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'fig.yml',
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'fig.yaml',
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]
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PATH_START_CHARS = [
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'/',
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'.',
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'~',
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]
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log = logging.getLogger(__name__)
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ConfigDetails = namedtuple('ConfigDetails', 'config working_dir filename')
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def find(base_dir, filename):
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if filename == '-':
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return ConfigDetails(yaml.safe_load(sys.stdin), os.getcwd(), None)
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if filename:
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filename = os.path.join(base_dir, filename)
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else:
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filename = get_config_path(base_dir)
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return ConfigDetails(load_yaml(filename), os.path.dirname(filename), filename)
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def get_config_path(base_dir):
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(candidates, path) = find_candidates_in_parent_dirs(SUPPORTED_FILENAMES, base_dir)
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if len(candidates) == 0:
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raise ComposeFileNotFound(SUPPORTED_FILENAMES)
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winner = candidates[0]
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if len(candidates) > 1:
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log.warn("Found multiple config files with supported names: %s", ", ".join(candidates))
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log.warn("Using %s\n", winner)
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if winner == 'docker-compose.yaml':
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log.warn("Please be aware that .yml is the expected extension "
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"in most cases, and using .yaml can cause compatibility "
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"issues in future.\n")
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if winner.startswith("fig."):
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log.warn("%s is deprecated and will not be supported in future. "
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"Please rename your config file to docker-compose.yml\n" % winner)
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return os.path.join(path, winner)
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def load(config_details):
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config, working_dir, filename = config_details
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if not isinstance(config, dict):
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raise ConfigurationError(
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"Top level object needs to be a dictionary. Check your .yml file that you have defined a service at the top level."
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)
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config = interpolate_environment_variables(config)
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validate_against_schema(config)
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service_dicts = []
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for service_name, service_dict in list(config.items()):
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loader = ServiceLoader(working_dir=working_dir, filename=filename)
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service_dict = loader.make_service_dict(service_name, service_dict)
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validate_paths(service_dict)
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service_dicts.append(service_dict)
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return service_dicts
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class ServiceLoader(object):
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def __init__(self, working_dir, filename=None, already_seen=None):
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self.working_dir = os.path.abspath(working_dir)
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if filename:
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self.filename = os.path.abspath(filename)
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else:
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self.filename = filename
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self.already_seen = already_seen or []
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def detect_cycle(self, name):
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if self.signature(name) in self.already_seen:
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raise CircularReference(self.already_seen + [self.signature(name)])
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def make_service_dict(self, name, service_dict):
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service_dict = service_dict.copy()
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service_dict['name'] = name
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service_dict = resolve_environment(service_dict, working_dir=self.working_dir)
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service_dict = self.resolve_extends(service_dict)
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return process_container_options(service_dict, working_dir=self.working_dir)
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def resolve_extends(self, service_dict):
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if 'extends' not in service_dict:
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return service_dict
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extends_options = self.validate_extends_options(service_dict['name'], service_dict['extends'])
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if self.working_dir is None:
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raise Exception("No working_dir passed to ServiceLoader()")
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if 'file' in extends_options:
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extends_from_filename = extends_options['file']
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other_config_path = expand_path(self.working_dir, extends_from_filename)
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else:
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other_config_path = self.filename
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other_working_dir = os.path.dirname(other_config_path)
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other_already_seen = self.already_seen + [self.signature(service_dict['name'])]
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other_loader = ServiceLoader(
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working_dir=other_working_dir,
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filename=other_config_path,
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already_seen=other_already_seen,
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)
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other_config = load_yaml(other_config_path)
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other_service_dict = other_config[extends_options['service']]
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other_loader.detect_cycle(extends_options['service'])
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other_service_dict = other_loader.make_service_dict(
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service_dict['name'],
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other_service_dict,
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)
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validate_extended_service_dict(
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other_service_dict,
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filename=other_config_path,
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service=extends_options['service'],
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)
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return merge_service_dicts(other_service_dict, service_dict)
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def signature(self, name):
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return (self.filename, name)
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def validate_extends_options(self, service_name, extends_options):
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error_prefix = "Invalid 'extends' configuration for %s:" % service_name
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if 'file' not in extends_options and self.filename is None:
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raise ConfigurationError(
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"%s you need to specify a 'file', e.g. 'file: something.yml'" % error_prefix
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)
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return extends_options
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def validate_extended_service_dict(service_dict, filename, service):
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error_prefix = "Cannot extend service '%s' in %s:" % (service, filename)
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if 'links' in service_dict:
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raise ConfigurationError("%s services with 'links' cannot be extended" % error_prefix)
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if 'volumes_from' in service_dict:
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raise ConfigurationError("%s services with 'volumes_from' cannot be extended" % error_prefix)
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if 'net' in service_dict:
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if get_service_name_from_net(service_dict['net']) is not None:
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raise ConfigurationError("%s services with 'net: container' cannot be extended" % error_prefix)
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def process_container_options(service_dict, working_dir=None):
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service_dict = service_dict.copy()
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if 'volumes' in service_dict and service_dict.get('volume_driver') is None:
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service_dict['volumes'] = resolve_volume_paths(service_dict, working_dir=working_dir)
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if 'build' in service_dict:
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service_dict['build'] = resolve_build_path(service_dict['build'], working_dir=working_dir)
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if 'labels' in service_dict:
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service_dict['labels'] = parse_labels(service_dict['labels'])
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return service_dict
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def merge_service_dicts(base, override):
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d = base.copy()
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if 'environment' in base or 'environment' in override:
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d['environment'] = merge_environment(
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base.get('environment'),
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override.get('environment'),
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)
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path_mapping_keys = ['volumes', 'devices']
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for key in path_mapping_keys:
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if key in base or key in override:
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d[key] = merge_path_mappings(
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base.get(key),
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override.get(key),
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)
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if 'labels' in base or 'labels' in override:
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d['labels'] = merge_labels(
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base.get('labels'),
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override.get('labels'),
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)
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if 'image' in override and 'build' in d:
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del d['build']
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if 'build' in override and 'image' in d:
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del d['image']
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list_keys = ['ports', 'expose', 'external_links']
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for key in list_keys:
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if key in base or key in override:
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d[key] = base.get(key, []) + override.get(key, [])
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list_or_string_keys = ['dns', 'dns_search']
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for key in list_or_string_keys:
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if key in base or key in override:
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d[key] = to_list(base.get(key)) + to_list(override.get(key))
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already_merged_keys = ['environment', 'labels'] + path_mapping_keys + list_keys + list_or_string_keys
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for k in set(ALLOWED_KEYS) - set(already_merged_keys):
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if k in override:
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d[k] = override[k]
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return d
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def merge_environment(base, override):
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env = parse_environment(base)
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env.update(parse_environment(override))
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return env
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def get_env_files(options, working_dir=None):
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if 'env_file' not in options:
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return {}
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if working_dir is None:
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raise Exception("No working_dir passed to get_env_files()")
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env_files = options.get('env_file', [])
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if not isinstance(env_files, list):
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env_files = [env_files]
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return [expand_path(working_dir, path) for path in env_files]
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def resolve_environment(service_dict, working_dir=None):
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service_dict = service_dict.copy()
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if 'environment' not in service_dict and 'env_file' not in service_dict:
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return service_dict
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env = {}
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if 'env_file' in service_dict:
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for f in get_env_files(service_dict, working_dir=working_dir):
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env.update(env_vars_from_file(f))
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del service_dict['env_file']
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env.update(parse_environment(service_dict.get('environment')))
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env = dict(resolve_env_var(k, v) for k, v in six.iteritems(env))
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service_dict['environment'] = env
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return service_dict
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def parse_environment(environment):
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if not environment:
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return {}
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if isinstance(environment, list):
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return dict(split_env(e) for e in environment)
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if isinstance(environment, dict):
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return environment
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raise ConfigurationError(
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"environment \"%s\" must be a list or mapping," %
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environment
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)
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def split_env(env):
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if '=' in env:
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return env.split('=', 1)
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else:
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return env, None
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def resolve_env_var(key, val):
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if val is not None:
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return key, val
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elif key in os.environ:
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return key, os.environ[key]
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else:
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return key, ''
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def env_vars_from_file(filename):
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"""
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Read in a line delimited file of environment variables.
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"""
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if not os.path.exists(filename):
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raise ConfigurationError("Couldn't find env file: %s" % filename)
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env = {}
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for line in open(filename, 'r'):
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line = line.strip()
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if line and not line.startswith('#'):
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k, v = split_env(line)
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env[k] = v
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return env
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def resolve_volume_paths(service_dict, working_dir=None):
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if working_dir is None:
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raise Exception("No working_dir passed to resolve_volume_paths()")
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return [
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resolve_volume_path(v, working_dir, service_dict['name'])
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for v in service_dict['volumes']
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]
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def resolve_volume_path(volume, working_dir, service_name):
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container_path, host_path = split_path_mapping(volume)
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container_path = os.path.expanduser(container_path)
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if host_path is not None:
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if not any(host_path.startswith(c) for c in PATH_START_CHARS):
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log.warn(
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'Warning: the mapping "{0}:{1}" in the volumes config for '
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'service "{2}" is ambiguous. In a future version of Docker, '
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'it will designate a "named" volume '
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'(see https://github.com/docker/docker/pull/14242). '
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'To prevent unexpected behaviour, change it to "./{0}:{1}"'
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.format(host_path, container_path, service_name)
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)
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host_path = os.path.expanduser(host_path)
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return "%s:%s" % (expand_path(working_dir, host_path), container_path)
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else:
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return container_path
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def resolve_build_path(build_path, working_dir=None):
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if working_dir is None:
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raise Exception("No working_dir passed to resolve_build_path")
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return expand_path(working_dir, build_path)
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def validate_paths(service_dict):
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if 'build' in service_dict:
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build_path = service_dict['build']
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if not os.path.exists(build_path) or not os.access(build_path, os.R_OK):
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raise ConfigurationError("build path %s either does not exist or is not accessible." % build_path)
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def merge_path_mappings(base, override):
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d = dict_from_path_mappings(base)
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d.update(dict_from_path_mappings(override))
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return path_mappings_from_dict(d)
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def dict_from_path_mappings(path_mappings):
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if path_mappings:
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return dict(split_path_mapping(v) for v in path_mappings)
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else:
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return {}
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def path_mappings_from_dict(d):
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return [join_path_mapping(v) for v in d.items()]
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def split_path_mapping(string):
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if ':' in string:
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(host, container) = string.split(':', 1)
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return (container, host)
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else:
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return (string, None)
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def join_path_mapping(pair):
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(container, host) = pair
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if host is None:
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return container
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else:
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return ":".join((host, container))
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def merge_labels(base, override):
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labels = parse_labels(base)
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labels.update(parse_labels(override))
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return labels
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def parse_labels(labels):
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if not labels:
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return {}
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if isinstance(labels, list):
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return dict(split_label(e) for e in labels)
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if isinstance(labels, dict):
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return labels
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def split_label(label):
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if '=' in label:
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return label.split('=', 1)
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else:
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return label, ''
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def expand_path(working_dir, path):
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return os.path.abspath(os.path.join(working_dir, path))
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def to_list(value):
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if value is None:
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return []
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elif isinstance(value, six.string_types):
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return [value]
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else:
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return value
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def get_service_name_from_net(net_config):
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if not net_config:
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return
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if not net_config.startswith('container:'):
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return
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_, net_name = net_config.split(':', 1)
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return net_name
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def load_yaml(filename):
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try:
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with open(filename, 'r') as fh:
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return yaml.safe_load(fh)
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except IOError as e:
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raise ConfigurationError(six.text_type(e))
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