Ulimits are now merged into extended services

Signed-off-by: Dimitar Bonev <dimitar.bonev@gmail.com>

compose/config/config.py

@@ -547,8 +547,15 @@ def merge_service_dicts(base, override, version):
                 base.get(field, default),
                 override.get(field, default))
 
-    merge_field('environment', merge_environment)
-    merge_field('labels', merge_labels)
+    def merge_mapping(mapping, parse_func):
+        if mapping in base or mapping in override:
+            merged = parse_func(base.get(mapping, None))
+            merged.update(parse_func(override.get(mapping, None)))
+            d[mapping] = merged
+
+    merge_mapping('environment', parse_environment)
+    merge_mapping('labels', parse_labels)
+    merge_mapping('ulimits', parse_ulimits)
 
     for field in ['volumes', 'devices']:
         merge_field(field, merge_path_mappings)
@@ -723,12 +730,6 @@ def join_path_mapping(pair):
         return ":".join((host, container))
 
 
-def merge_labels(base, override):
-    labels = parse_labels(base)
-    labels.update(parse_labels(override))
-    return labels
-
-
 def parse_labels(labels):
     if not labels:
         return {}
@@ -747,6 +748,14 @@ def split_label(label):
         return label, ''
 
 
+def parse_ulimits(ulimits):
+    if not ulimits:
+        return {}
+
+    if isinstance(ulimits, dict):
+        return dict(ulimits)
+
+
 def expand_path(working_dir, path):
     return os.path.abspath(os.path.join(working_dir, os.path.expanduser(path)))
 

tests/fixtures/extends/common-env-labels-ulimits.yml

@@ -0,0 +1,13 @@
+web:
+  extends:
+    file: common.yml
+    service: web
+  environment:
+    - FOO=2
+    - BAZ=3
+  labels: ['label=one']
+  ulimits:
+    nproc: 65535
+    memlock:
+        soft: 1024
+        hard: 2048

tests/unit/config/config_test.py

@@ -1396,6 +1396,24 @@ class ExtendsTest(unittest.TestCase):
             }
         ]))
 
+    def test_merging_env_labels_ulimits(self):
+        service_dicts = load_from_filename('tests/fixtures/extends/common-env-labels-ulimits.yml')
+
+        self.assertEqual(service_sort(service_dicts), service_sort([
+            {
+                'name': 'web',
+                'image': 'busybox',
+                'command': '/bin/true',
+                'environment': {
+                    "FOO": "2",
+                    "BAR": "1",
+                    "BAZ": "3",
+                },
+                'labels': {'label': 'one'},
+                'ulimits': {'nproc': 65535, 'memlock': {'soft': 1024, 'hard': 2048}}
+            }
+        ]))
+
     def test_nested(self):
         service_dicts = load_from_filename('tests/fixtures/extends/nested.yml')