Fix mergo merging panic for volumes

Signed-off-by: Ulysses Souza <[email protected]>

Author: ulyssessouza

compatibility/checker.go

@@ -200,7 +200,7 @@ func Check(project *types.Project, c Checker) {
 	}
 
 	for i, volume := range project.Volumes {
-		CheckVolumeConfig(&volume, c)
+		CheckVolumeConfig(volume, c)
 		project.Volumes[i] = volume
 	}
 

loader/full-struct_test.go

@@ -460,9 +460,9 @@ func networks() map[string]types.NetworkConfig {
 	}
 }
 
-func volumes() map[string]types.VolumeConfig {
-	return map[string]types.VolumeConfig{
-		"some-volume": {},
+func volumes() map[string]*types.VolumeConfig {
+	return map[string]*types.VolumeConfig{
+		"some-volume": nil,
 		"other-volume": {
 			Driver: "flocker",
 			DriverOpts: map[string]string{
@@ -901,7 +901,7 @@ volumes:
       foo: bar
     labels:
       foo: bar
-  some-volume: {}
+  some-volume: null
 secrets:
   secret1:
     file: %s
@@ -1494,9 +1494,7 @@ func fullExampleJSON(workingDir, homeDir string) string {
         "foo": "bar"
       }
     },
-    "some-volume": {
-      "external": false
-    }
+    "some-volume": null
   },
   "x-bar": "baz",
   "x-foo": "bar",

loader/loader.go

@@ -621,14 +621,14 @@ func externalVolumeError(volume, key string) error {
 
 // LoadVolumes produces a VolumeConfig map from a compose file Dict
 // the source Dict is not validated if directly used. Use Load() to enable validation
-func LoadVolumes(source map[string]interface{}) (map[string]types.VolumeConfig, error) {
-	volumes := make(map[string]types.VolumeConfig)
+func LoadVolumes(source map[string]interface{}) (map[string]*types.VolumeConfig, error) {
+	volumes := make(map[string]*types.VolumeConfig)
 	if err := Transform(source, &volumes); err != nil {
 		return volumes, err
 	}
 
 	for name, volume := range volumes {
-		if !volume.External.External {
+		if volume == nil || !volume.External.External {
 			continue
 		}
 		switch {

loader/loader_test.go

@@ -234,7 +234,7 @@ var sampleConfig = types.Config{
 			},
 		},
 	},
-	Volumes: map[string]types.VolumeConfig{
+	Volumes: map[string]*types.VolumeConfig{
 		"hello": {
 			Driver: "default",
 			DriverOpts: map[string]string{
@@ -665,7 +665,7 @@ networks:
 		Secrets: map[string]types.SecretConfig{
 			"super": {External: types.External{External: true}, Name: "super"},
 		},
-		Volumes: map[string]types.VolumeConfig{
+		Volumes: map[string]*types.VolumeConfig{
 			"data": {External: types.External{External: true}, Name: "data"},
 		},
 		Networks: map[string]types.NetworkConfig{
@@ -1211,7 +1211,7 @@ func TestLoadVolumesWarnOnDeprecatedExternalNameVersion34(t *testing.T) {
 	}
 	volumes, err := LoadVolumes(source)
 	assert.NilError(t, err)
-	expected := map[string]types.VolumeConfig{
+	expected := map[string]*types.VolumeConfig{
 		"foo": {
 			Name:     "oops",
 			External: types.External{External: true},
@@ -1242,7 +1242,7 @@ func TestLoadVolumesWarnOnDeprecatedExternalName(t *testing.T) {
 	}
 	volumes, err := LoadVolumes(source)
 	assert.NilError(t, err)
-	expected := map[string]types.VolumeConfig{
+	expected := map[string]*types.VolumeConfig{
 		"foo": {
 			Name:     "oops",
 			External: types.External{External: true},

loader/merge.go

@@ -259,7 +259,7 @@ func mapByName(services []types.ServiceConfig) map[string]types.ServiceConfig {
 	return m
 }
 
-func mergeVolumes(base, override map[string]types.VolumeConfig) (map[string]types.VolumeConfig, error) {
+func mergeVolumes(base, override map[string]*types.VolumeConfig) (map[string]*types.VolumeConfig, error) {
 	err := mergo.Map(&base, &override, mergo.WithOverride)
 	return base, err
 }

loader/validate_test.go

@@ -61,7 +61,7 @@ func TestValidateNamedVolume(t *testing.T) {
 	err := checkConsistency(project)
 	assert.Error(t, err, `service "myservice" refers to undefined volume myVolume: invalid compose project`)
 
-	project.Volumes = types.Volumes(map[string]types.VolumeConfig{
+	project.Volumes = types.Volumes(map[string]*types.VolumeConfig{
 		"myVolume": {
 			Name: "myVolume",
 		},

loader/with-version-struct_test.go

@@ -62,8 +62,8 @@ func withVersionNetworks() map[string]types.NetworkConfig {
 	}
 }
 
-func withVersionVolumes() map[string]types.VolumeConfig {
-	return map[string]types.VolumeConfig{
+func withVersionVolumes() map[string]*types.VolumeConfig {
+	return map[string]*types.VolumeConfig{
 		"data": {
 			Driver: "local",
 		},

types/config.go

@@ -54,7 +54,7 @@ type Config struct {
 }
 
 // Volumes is a map of VolumeConfig
-type Volumes map[string]VolumeConfig
+type Volumes map[string]*VolumeConfig
 
 // Networks is a map of NetworkConfig
 type Networks map[string]NetworkConfig