def __init__(self, config=None, prev_config=None):
"""Generate a list of mixin classes that implement the backend, working
through composition.
'config' is a dict which typically comes from the JSON de-serialization
of config.json in JujuGUI.
'prev_config' is a dict used to compute the differences. If it is not
passed, all current config values are considered new.
"""
if config is None:
config = utils.get_config()
self.config = config
if prev_config is None:
prev_config = {}
self.prev_config = prev_config
self.mixins = [SetUpMixin()]
is_legacy_juju = utils.legacy_juju()
if config["staging"]:
if not is_legacy_juju:
raise ValueError("Unable to use staging with go backend")
self.mixins.append(ImprovMixin())
elif config["sandbox"]:
self.mixins.append(SandboxMixin())
else:
mixin = PythonMixin() if is_legacy_juju else GoMixin()
self.mixins.append(mixin)
# We always install and start the GUI.
self.mixins.append(GuiMixin())
# TODO: eventually this option will go away, as well as haproxy and
# Apache.
if config.get("builtin-server", False):
self.mixins.append(BuiltinServerMixin())
else:
self.mixins.append(HaproxyApacheMixin())
def test_pyjuju(self):
# If the agent file does not exist this is a PyJuju environment.
self.assertTrue(legacy_juju())
def test_jujucore(self):
# If the agent file is found this is a juju-core environment.
agent_path = os.path.join(self.base_dir, 'agent.conf')
open(agent_path, 'w').close()
self.assertFalse(legacy_juju())
