die on protobuf mis-match

config.go

@@ -56,7 +56,25 @@ func (all *Repos) ConfigLoad() error {
 		all.sampleConfig() // causes nil panic
 		return errors.New("gitpb.ConfigLoad() repos.pb is empty")
 	}
-	return all.Unmarshal(data)
+	err = all.Unmarshal(data)
+	test := NewRepos()
+	if test.Uuid != all.Uuid {
+		log.Log(WARN, "uuids do not match", test.Uuid, all.Uuid)
+		deleteProtobufFile(cfgname)
+	}
+	if test.Version != all.Version {
+		log.Log(WARN, "versions do not match", test.Version, all.Version)
+		deleteProtobufFile(cfgname)
+	}
+	log.Log(INFO, cfgname, "protobuf versions and uuid match", all.Uuid, all.Version)
+	return err
+}
+
+func deleteProtobufFile(filename string) {
+	log.Log(WARN, "The protobuf file format has changed for", filename)
+	log.Log(WARN, "You must delete", filename)
+	log.Log(WARN, "This file will be recreated")
+	os.Exit(-1)
 }
 
 func (all *Repos) sampleConfig() {