fix network aliasses merge logic to conform to docker compose v1

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

Author: ndeloof

loader/merge.go

@@ -38,7 +38,6 @@ var serviceSpecials = &specials{
 		reflect.TypeOf([]types.ServiceSecretConfig{}):    mergeSlice(toServiceSecretConfigsMap, toServiceSecretConfigsSlice),
 		reflect.TypeOf([]types.ServiceConfigObjConfig{}): mergeSlice(toServiceConfigObjConfigsMap, toSServiceConfigObjConfigsSlice),
 		reflect.TypeOf(&types.UlimitsConfig{}):           mergeUlimitsConfig,
-		reflect.TypeOf(&types.ServiceNetworkConfig{}):    mergeServiceNetworkConfig,
 	},
 }
 
@@ -327,20 +326,6 @@ func mergeUlimitsConfig(dst, src reflect.Value) error {
 	return nil
 }
 
-// nolint: unparam
-func mergeServiceNetworkConfig(dst, src reflect.Value) error {
-	if src.Interface() != reflect.Zero(reflect.TypeOf(src.Interface())).Interface() {
-		dst.Elem().FieldByName("Aliases").Set(src.Elem().FieldByName("Aliases"))
-		if ipv4 := src.Elem().FieldByName("Ipv4Address").Interface().(string); ipv4 != "" {
-			dst.Elem().FieldByName("Ipv4Address").SetString(ipv4)
-		}
-		if ipv6 := src.Elem().FieldByName("Ipv6Address").Interface().(string); ipv6 != "" {
-			dst.Elem().FieldByName("Ipv6Address").SetString(ipv6)
-		}
-	}
-	return nil
-}
-
 func getLoggingDriver(v reflect.Value) string {
 	return v.FieldByName("Driver").String()
 }

loader/merge_test.go

@@ -816,7 +816,7 @@ func TestLoadMultipleServiceNetworks(t *testing.T) {
 			},
 			expected: map[string]*types.ServiceNetworkConfig{
 				"net1": {
-					Aliases: []string{"alias2", "alias3"},
+					Aliases: []string{"alias1", "alias2", "alias3"},
 				},
 				"net2": nil,
 				"net3": {},
@@ -1111,13 +1111,8 @@ func TestMergeUlimitsConfig(t *testing.T) {
 }
 
 func TestMergeServiceNetworkConfig(t *testing.T) {
-	specials := &specials{
-		m: map[reflect.Type]func(dst, src reflect.Value) error{
-			reflect.TypeOf(&types.ServiceNetworkConfig{}): mergeServiceNetworkConfig,
-		},
-	}
 	base := map[string]*types.ServiceNetworkConfig{
-		"override-aliases": {
+		"merge": {
 			Aliases:     []string{"100", "101"},
 			Ipv4Address: "127.0.0.1",
 			Ipv6Address: "0:0:0:0:0:0:0:1",
@@ -1129,7 +1124,7 @@ func TestMergeServiceNetworkConfig(t *testing.T) {
 		},
 	}
 	override := map[string]*types.ServiceNetworkConfig{
-		"override-aliases": {
+		"merge": {
 			Aliases:     []string{"110", "111"},
 			Ipv4Address: "127.0.1.1",
 			Ipv6Address: "0:0:0:0:0:0:1:1",
@@ -1140,14 +1135,14 @@ func TestMergeServiceNetworkConfig(t *testing.T) {
 			Ipv6Address: "0:0:0:0:0:0:3:1",
 		},
 	}
-	err := mergo.Merge(&base, &override, mergo.WithOverride, mergo.WithTransformers(specials))
+	err := mergo.Merge(&base, &override, mergo.WithAppendSlice, mergo.WithOverride)
 	assert.NilError(t, err)
 	assert.DeepEqual(
 		t,
 		base,
 		map[string]*types.ServiceNetworkConfig{
-			"override-aliases": {
-				Aliases:     []string{"110", "111"},
+			"merge": {
+				Aliases:     []string{"100", "101", "110", "111"},
 				Ipv4Address: "127.0.1.1",
 				Ipv6Address: "0:0:0:0:0:0:1:1",
 			},