exlusions apply to source, not merged result

Signed-off-by: Nicolas De Loof <[email protected]>

loader/extends.go

@@ -29,7 +29,7 @@ import (
 
 // as we use another service definition by `extends`, we must exclude attributes which creates dependency to another service
 // see https://github.com/compose-spec/compose-spec/blob/main/05-services.md#restrictions
-var exclusions = []string{"extends", "depends_on", "volumes_from"}
+var exclusions = []string{"depends_on", "volumes_from"}
 
 func ApplyExtends(ctx context.Context, dict map[string]any, opts *Options, tracker *cycleTracker, post ...PostProcessor) error {
 	a, ok := dict["services"]
@@ -123,13 +123,15 @@ func applyServiceExtends(ctx context.Context, name string, services map[string]a
 			},
 		})
 	}
+	for _, exclusion := range exclusions {
+		delete(source, exclusion)
+	}
 	merged, err := override.ExtendService(source, service)
 	if err != nil {
 		return nil, err
 	}
-	for _, exclusion := range exclusions {
-		delete(merged, exclusion)
-	}
+
+	delete(merged, "extends")
 	services[name] = merged
 	return merged, nil
 }

loader/extends_test.go

@@ -386,6 +386,29 @@ services:
 	}
 }
 
+func TestLoadExtendsDependsOn(t *testing.T) {
+	yaml := `
+name: extends-depends_on
+services:
+  service_a:
+    image: a
+    depends_on:
+      - service_c
+  
+  service_b:
+    extends: service_a
+    depends_on:
+      - service_a
+
+  service_c:
+    image: c`
+	p, err := loadYAML(yaml)
+	assert.NilError(t, err)
+	assert.DeepEqual(t, p.Services["service_b"].DependsOn, types.DependsOnConfig{
+		"service_a": types.ServiceDependency{Condition: types.ServiceConditionStarted, Required: true},
+	})
+}
+
 func TestLoadExtendsListener(t *testing.T) {
 	yaml := `
   name: listener-extends