coreos-cloudinit: bump to v1.3.1

configdrive: check metadata length before parsing

coreos-cloudinit.go

@@ -39,7 +39,7 @@ import (
 )
 
 const (
-	version               = "1.3.0"
+	version               = "1.3.1"
 	datasourceInterval    = 100 * time.Millisecond
 	datasourceMaxInterval = 30 * time.Second
 	datasourceTimeout     = 5 * time.Minute

datasource/configdrive/configdrive.go

@@ -60,7 +60,7 @@ func (cd *configDrive) FetchMetadata() (metadata datasource.Metadata, err error)
 		} `json:"network_config"`
 	}
 
-	if data, err = cd.tryReadFile(path.Join(cd.openstackVersionRoot(), "meta_data.json")); err != nil {
+	if data, err = cd.tryReadFile(path.Join(cd.openstackVersionRoot(), "meta_data.json")); err != nil || len(data) == 0 {
 		return
 	}
 	if err = json.Unmarshal([]byte(data), &m); err != nil {

datasource/configdrive/configdrive_test.go

@@ -29,6 +29,10 @@ func TestFetchMetadata(t *testing.T) {
 
 		metadata datasource.Metadata
 	}{
+		{
+			root:  "/",
+			files: test.MockFilesystem{"/openstack/latest/meta_data.json": ""},
+		},
 		{
 			root:  "/",
 			files: test.MockFilesystem{"/openstack/latest/meta_data.json": `{"ignore": "me"}`},