Remove validation of supported log drivers

By having this hardcoded list of log drivers, it is a bottleneck
to us supporting more log drivers.

The daemon already validates if a log driver is valid or not, so rather
than duplicating that validation, let's pass the log_driver along.

This allows support for new/more log drivers as they become supported
in docker without having to wait for both docker-py and docker-compose
to support them.

Keeping the current list of log driver types for backwards compatibility.

Signed-off-by: Mazz Mosley <mazz@houseofmnowster.com>

docker/utils/types.py

@@ -20,21 +20,17 @@ class DictType(dict):
 
 
 class LogConfig(DictType):
-    types = LogConfigTypesEnum
 
     def __init__(self, **kwargs):
-        type_ = kwargs.get('type', kwargs.get('Type'))
-        config = kwargs.get('config', kwargs.get('Config'))
-        if type_ not in self.types._values:
-            raise ValueError("LogConfig.type must be one of ({0})".format(
-                ', '.join(self.types._values)
-            ))
+        log_driver_type = kwargs.get('type', kwargs.get('Type'))
+        config = kwargs.get('config', kwargs.get('Config')) or {}
+
         if config and not isinstance(config, dict):
             raise ValueError("LogConfig.config must be a dictionary")
 
         super(LogConfig, self).__init__({
-            'Type': type_,
-            'Config': config or {}
+            'Type': log_driver_type,
+            'Config': config
         })
 
     @property
@@ -43,10 +39,6 @@ class LogConfig(DictType):
 
     @type.setter
     def type(self, value):
-        if value not in self.types._values:
-            raise ValueError("LogConfig.type must be one of {0}".format(
-                ', '.join(self.types._values)
-            ))
         self['Type'] = value
 
     @property

tests/integration_test.py

@@ -34,6 +34,7 @@ from six.moves import BaseHTTPServer
 from six.moves import socketserver
 
 from .test import Cleanup
+from docker.errors import APIError
 
 # FIXME: missing tests for
 # export; history; insert; port; push; tag; get; load; stats
@@ -265,6 +266,22 @@ class CreateContainerWithLogConfigTest(BaseTestCase):
         self.assertEqual(container_log_config['Type'], log_config.type)
         self.assertEqual(container_log_config['Config'], log_config.config)
 
+    def test_invalid_log_driver_raises_exception(self):
+        log_config = docker.utils.LogConfig(
+            type='asdf-nope',
+            config={}
+        )
+
+        container = self.client.create_container(
+            'busybox', ['true'],
+            host_config=create_host_config(log_config=log_config)
+        )
+
+        expected_msg = "logger: no log driver named 'asdf-nope' is registered"
+        with self.assertRaisesRegexp(APIError, expected_msg):
+            # raises an internal server error 500
+            self.client.start(container)
+
 
 @unittest.skipIf(not EXEC_DRIVER_IS_NATIVE, 'Exec driver not native')
 class TestCreateContainerReadOnlyFs(BaseTestCase):

tests/utils_test.py

@@ -192,29 +192,19 @@ class UtilsTest(base.BaseTestCase):
         self.assertRaises(ValueError, lambda: Ulimit(name='hello', hard='456'))
 
     def test_create_host_config_dict_logconfig(self):
-        dct = {'type': LogConfig.types.SYSLOG, 'config': {'key1': 'val1'}}
-        config = create_host_config(
-            log_config=dct, version=DEFAULT_DOCKER_API_VERSION
-        )
+        dct = {'type': 'syslog', 'config': {'key1': 'val1'}}
+        config = create_host_config(log_config=dct)
         self.assertIn('LogConfig', config)
         self.assertTrue(isinstance(config['LogConfig'], LogConfig))
         self.assertEqual(dct['type'], config['LogConfig'].type)
 
     def test_create_host_config_obj_logconfig(self):
-        obj = LogConfig(type=LogConfig.types.SYSLOG, config={'key1': 'val1'})
-        config = create_host_config(
-            log_config=obj, version=DEFAULT_DOCKER_API_VERSION
-        )
+        obj = LogConfig(type='syslog', config={'key1': 'val1'})
+        config = create_host_config(log_config=obj)
         self.assertIn('LogConfig', config)
         self.assertTrue(isinstance(config['LogConfig'], LogConfig))
         self.assertEqual(obj, config['LogConfig'])
 
-    def test_logconfig_invalid_type(self):
-        self.assertRaises(ValueError, lambda: LogConfig(type='xxx', config={}))
-        self.assertRaises(ValueError, lambda: LogConfig(
-            type=LogConfig.types.JSON, config='helloworld'
-        ))
-
     def test_resolve_repository_name(self):
         # docker hub library image
         self.assertEqual(