Fix env_file and environment when used with extends.

Signed-off-by: Daniel Nephin <dnephin@docker.com>

compose/config/config.py

@@ -257,16 +257,11 @@ class ServiceExtendsResolver(object):
     def run(self):
         self.detect_cycle()
 
-        service_dict = dict(self.service_config.config)
+        if 'extends' in self.service_config.config:
-        env = resolve_environment(self.working_dir, self.service_config.config)
-        if env:
-            service_dict['environment'] = env
-            service_dict.pop('env_file', None)
-
-        if 'extends' in service_dict:
             service_dict = self.resolve_extends(*self.validate_and_construct_extends())
+            return self.service_config._replace(config=service_dict)
 
-        return self.service_config._replace(config=service_dict)
+        return self.service_config
 
     def validate_and_construct_extends(self):
         extends = self.service_config.config['extends']
@@ -316,16 +311,15 @@ class ServiceExtendsResolver(object):
         return filename
 
 
-def resolve_environment(working_dir, service_dict):
+def resolve_environment(service_config):
     """Unpack any environment variables from an env_file, if set.
     Interpolate environment values if set.
     """
-    if 'environment' not in service_dict and 'env_file' not in service_dict:
+    service_dict = service_config.config
-        return {}
 
     env = {}
     if 'env_file' in service_dict:
-        for env_file in get_env_files(working_dir, service_dict):
+        for env_file in get_env_files(service_config.working_dir, service_dict):
             env.update(env_vars_from_file(env_file))
 
     env.update(parse_environment(service_dict.get('environment')))
@@ -362,6 +356,10 @@ def process_service(service_config):
     working_dir = service_config.working_dir
     service_dict = dict(service_config.config)
 
+    if 'environment' in service_dict or 'env_file' in service_dict:
+        service_dict['environment'] = resolve_environment(service_config)
+        service_dict.pop('env_file', None)
+
     if 'volumes' in service_dict and service_dict.get('volume_driver') is None:
         service_dict['volumes'] = resolve_volume_paths(working_dir, service_dict)
 

tests/integration/testcases.py

@@ -46,7 +46,8 @@ class DockerClientTestCase(unittest.TestCase):
 
         service_config = ServiceConfig('.', None, name, kwargs)
         options = process_service(service_config)
-        options['environment'] = resolve_environment('.', kwargs)
+        options['environment'] = resolve_environment(
+            service_config._replace(config=options))
         labels = options.setdefault('labels', {})
         labels['com.docker.compose.test-name'] = self.id()
 

tests/unit/config/config_test.py

@@ -1317,6 +1317,54 @@ class ExtendsTest(unittest.TestCase):
             },
         ]))
 
+    def test_extends_with_environment_and_env_files(self):
+        tmpdir = py.test.ensuretemp('test_extends_with_environment')
+        self.addCleanup(tmpdir.remove)
+        commondir = tmpdir.mkdir('common')
+        commondir.join('base.yml').write("""
+            app:
+                image: 'example/app'
+                env_file:
+                    - 'envs'
+                environment:
+                    - SECRET
+        """)
+        tmpdir.join('docker-compose.yml').write("""
+            ext:
+                extends:
+                    file: common/base.yml
+                    service: app
+                env_file:
+                    - 'envs'
+                environment:
+                    - THING
+        """)
+        commondir.join('envs').write("""
+            COMMON_ENV_FILE=1
+        """)
+        tmpdir.join('envs').write("""
+            FROM_ENV_FILE=1
+        """)
+
+        expected = [
+            {
+                'name': 'ext',
+                'image': 'example/app',
+                'environment': {
+                    'SECRET': 'secret',
+                    'FROM_ENV_FILE': '1',
+                    'COMMON_ENV_FILE': '1',
+                    'THING': 'thing',
+                },
+            },
+        ]
+        with mock.patch.dict(os.environ):
+            os.environ['SECRET'] = 'secret'
+            os.environ['THING'] = 'thing'
+            config = load_from_filename(str(tmpdir.join('docker-compose.yml')))
+
+        assert config == expected
+
 
 @pytest.mark.xfail(IS_WINDOWS_PLATFORM, reason='paths use slash')
 class ExpandPathTest(unittest.TestCase):