diff --git a/lib/ansible/modules/cloud/docker/docker.py b/lib/ansible/modules/cloud/docker/docker.py index 0902c4a296e..fb24bb0fe08 100644 --- a/lib/ansible/modules/cloud/docker/docker.py +++ b/lib/ansible/modules/cloud/docker/docker.py @@ -409,9 +409,60 @@ def get_split_image_tag(image): return resource, tag +def get_docker_py_versioninfo(): + if hasattr(docker, '__version__'): + # a '__version__' attribute was added to the module but not until + # after 0.3.0 was pushed to pypi. If it's there, use it. + version = [] + for part in docker.__version__.split('.'): + try: + version.append(int(part)) + except ValueError: + for idx, char in enumerate(part): + if not char.isdigit(): + nondigit = part[idx:] + digit = part[:idx] + if digit: + version.append(int(digit)) + if nondigit: + version.append(nondigit) + elif hasattr(docker.Client, '_get_raw_response_socket'): + # HACK: if '__version__' isn't there, we check for the existence of + # `_get_raw_response_socket` in the docker.Client class, which was + # added in 0.3.0 + version = (0, 3, 0) + else: + # This is untrue but this module does not function with a version less + # than 0.3.0 so it's okay to lie here. + version = (0,) + + return version + +def check_dependencies(module): + """ + Ensure `docker-py` >= 0.3.0 is installed, and call module.fail_json with a + helpful error message if it isn't. + """ + if not HAS_DOCKER_PY: + module.fail_json(msg="`docker-py` doesn't seem to be installed, but is required for the Ansible Docker module.") + else: + versioninfo = get_docker_py_versioninfo() + if versioninfo < (0, 3, 0): + module.fail_json(msg="The Ansible Docker module requires `docker-py` >= 0.3.0.") + + class DockerManager: counters = {'created':0, 'started':0, 'stopped':0, 'killed':0, 'removed':0, 'restarted':0, 'pull':0} + _capabilities = set() + # Map optional parameters to minimum (docker-py version, server APIVersion) + # docker-py version is a tuple of ints because we have to compare them + # server APIVersion is passed to a docker-py function that takes strings + _cap_ver_req = { + 'dns': ((0, 3, 0), '1.10'), + 'volume_from': ((0, 3, 0), '1.10'), + 'restart_policy': ((0, 5, 0), '1.14'), + } def __init__(self, module): self.module = module @@ -466,6 +517,39 @@ class DockerManager: docker_api_version = module.params.get('docker_api_version') self.client = docker.Client(base_url=docker_url.geturl(), version=docker_api_version) + self.docker_py_versioninfo = get_docker_py_versioninfo() + + def _check_capabilties(self): + """ + Create a list of available capabilities + """ + api_version = self.client.version()['ApiVersion'] + for cap, req_vers in self._cap_ver_req.items(): + if (self.docker_py_versioninfo >= req_vers[0] and + docker.utils.compare_version(req_vers[1], api_version) >= 0): + self._capabilities.add(cap) + + def ensure_capability(self, capability): + """ + Some of the functionality this ansible module implements are only + available in newer versions of docker. Ensure that the capability + is available here. + """ + if not self._capabilities: + self._check_capabilties() + + if capability in self._capabilities: + return True + + api_version = self.client.version()['ApiVersion'] + self.module.fail_json(msg='Specifying the `%s` parameter requires' + ' docker-py: %s, docker server apiversion %s; found' + ' docker-py: %s, server: %s' % ( + capability, + '.'.join(self._cap_ver_req[capability][0]), + self._cap_ver_req[capability][1], + '.'.join(self.docker_py_versioninfo), + api_version)) def get_links(self, links): """ @@ -628,9 +712,11 @@ class DockerManager: 'tty': self.module.params.get('tty'), } - if docker.utils.compare_version('1.10', self.client.version()['ApiVersion']) < 0: - params['dns'] = self.module.params.get('dns') - params['volumes_from'] = self.module.params.get('volumes_from') + if params['dns'] is not None: + self.ensure_capability('dns') + + if params['volumes_from'] is not None: + self.ensure_capability('volumes_from') def do_create(count, params): results = [] @@ -675,15 +761,24 @@ class DockerManager: 'links': self.links, 'network_mode': self.module.params.get('net'), } - if docker.utils.compare_version('1.10', self.client.version()['ApiVersion']) >= 0 and hasattr(docker, '__version__') and docker.__version__ > '0.3.0': - params['dns'] = self.module.params.get('dns') - params['volumes_from'] = self.module.params.get('volumes_from') - if docker.utils.compare_version('1.14', self.client.version()['ApiVersion']) >= 0 and hasattr(docker, '__version__') and docker.__version__ >= '0.5.0': - if self.module.params.get('restart_policy') is not None: - params['restart_policy'] = { 'Name': self.module.params.get('restart_policy') } - if params['restart_policy']['Name'] == 'on-failure': - params['restart_policy']['MaximumRetryCount'] = self.module.params.get('restart_policy_retry') + optionals = [] + for optional_param in ('dns', 'volumes_from', 'restart_policy', 'restart_policy_retry'): + optionals[optional_param] = self.module.params.get(optional_param) + + if optionals['dns'] is not None: + self.ensure_capability('dns') + params['dns'] = optionals['dns'] + + if optionals['volumes_from'] is not None: + self.ensure_capability('volumes_from') + params['volumes_from'] = optionals['volumes_from'] + + if optionals['restart_policy'] is not None: + self.ensure_capability('restart_policy') + params['restart_policy'] = { 'Name': optionals['restart_policy'] } + if params['restart_policy']['Name'] == 'on-failure': + params['restart_policy']['MaximumRetryCount'] = optionals['restart_policy_retry'] for i in containers: self.client.start(i['Id'], **params) @@ -712,31 +807,6 @@ class DockerManager: self.increment_counter('restarted') -def check_dependencies(module): - """ - Ensure `docker-py` >= 0.3.0 is installed, and call module.fail_json with a - helpful error message if it isn't. - """ - if not HAS_DOCKER_PY: - module.fail_json(msg="`docker-py` doesn't seem to be installed, but is required for the Ansible Docker module.") - else: - HAS_NEW_ENOUGH_DOCKER_PY = False - if hasattr(docker, '__version__'): - # a '__version__' attribute was added to the module but not until - # after 0.3.0 was added pushed to pip. If it's there, use it. - if docker.__version__ >= '0.3.0': - HAS_NEW_ENOUGH_DOCKER_PY = True - else: - # HACK: if '__version__' isn't there, we check for the existence of - # `_get_raw_response_socket` in the docker.Client class, which was - # added in 0.3.0 - if hasattr(docker.Client, '_get_raw_response_socket'): - HAS_NEW_ENOUGH_DOCKER_PY = True - - if not HAS_NEW_ENOUGH_DOCKER_PY: - module.fail_json(msg="The Ansible Docker module requires `docker-py` >= 0.3.0.") - - def main(): module = AnsibleModule( argument_spec = dict(