Add ability to output json lists in metadata build file

Signed-off-by: Laurent Goderre <[email protected]>

commands/build.go

@@ -737,8 +737,30 @@ func checkWarnedFlags(f *pflag.Flag) {
 	}
 }
 
-func writeMetadataFile(filename string, dt interface{}) error {
-	b, err := json.MarshalIndent(dt, "", "  ")
+func writeMetadataFile(filename string, response map[string]interface{}) error {
+	out := make(map[string]interface{})
+	for k, v := range response {
+		var dt []byte
+		j, ok := v.(string)
+		if ok {
+			d, err := base64.StdEncoding.DecodeString(string(j))
+			if err != nil {
+				out[k] = v
+				continue
+			}
+			dt = d
+		} else if d, ok := v.(json.RawMessage); ok {
+			dt = d
+		}
+
+		var raw interface{}
+		if err := json.Unmarshal(dt, &raw); err != nil {
+			out[k] = v
+			continue
+		}
+		out[k] = json.RawMessage(dt)
+	}
+	b, err := json.MarshalIndent(out, "", "  ")
 	if err != nil {
 		return err
 	}