Services can join 'bridge' or 'host'

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

compose/project.py

@@ -172,13 +172,16 @@ class Project(object):
     def get_networks(self, service_dict, network_definitions):
         networks = []
         for name in service_dict.pop('networks', ['default']):
-            matches = [n for n in network_definitions if n.name == name]
-            if matches:
-                networks.append(matches[0].full_name)
+            if name in ['bridge', 'host']:
+                networks.append(name)
             else:
-                raise ConfigurationError(
-                    'Service "{}" uses an undefined network "{}"'
-                    .format(service_dict['name'], name))
+                matches = [n for n in network_definitions if n.name == name]
+                if matches:
+                    networks.append(matches[0].full_name)
+                else:
+                    raise ConfigurationError(
+                        'Service "{}" uses an undefined network "{}"'
+                        .format(service_dict['name'], name))
         return networks
 
     def get_links(self, service_dict):

tests/acceptance/cli_test.py

@@ -437,6 +437,25 @@ class CLITestCase(DockerClientTestCase):
 
         assert 'Service "web" uses an undefined network "foo"' in result.stderr
 
+    def test_up_predefined_networks(self):
+        filename = 'predefined-networks.yml'
+
+        self.base_dir = 'tests/fixtures/networks'
+        self._project = get_project(self.base_dir, [filename])
+
+        self.dispatch(['-f', filename, 'up', '-d'], None)
+
+        networks = [
+            n for n in self.client.networks()
+            if n['Name'].startswith('{}_'.format(self.project.name))
+        ]
+        assert not networks
+
+        for name in ['bridge', 'host', 'none']:
+            container = self.project.get_service(name).containers()[0]
+            assert container.get('NetworkSettings.Networks').keys() == [name]
+            assert container.get('HostConfig.NetworkMode') == name
+
     def test_up_no_services(self):
         self.base_dir = 'tests/fixtures/no-services'
         self.dispatch(['up', '-d'], None)

tests/fixtures/networks/predefined-networks.yml

@@ -0,0 +1,17 @@
+version: 2
+
+services:
+  bridge:
+    image: busybox
+    command: top
+    networks: ["bridge"]
+
+  host:
+    image: busybox
+    command: top
+    networks: ["host"]
+
+  none:
+    image: busybox
+    command: top
+    networks: []