validate instead that file data is not empty

Signed-off-by: garfthoffman <[email protected]>

go/vt/tableacl/tableacl.go

@@ -96,11 +96,11 @@ var currentTableACL tableACL
 //	    }
 //	  ]
 //	}
-func Init(configFile string, aclCB func()) error {
-	return currentTableACL.init(configFile, aclCB)
+func Init(configFile string, aclCB func(), enforceTableACLConfig string) error {
+	return currentTableACL.init(configFile, aclCB, enforceTableACLConfig string)
 }
 
-func (tacl *tableACL) init(configFile string, aclCB func()) error {
+func (tacl *tableACL) init(configFile string, aclCB func(), enforceTableACLConfig string) error {
 	tacl.SetCallback(aclCB)
 	if configFile == "" {
 		return nil
@@ -110,6 +110,10 @@ func (tacl *tableACL) init(configFile string, aclCB func()) error {
 		log.Infof("unable to read tableACL config file: %v  Error: %v", configFile, err)
 		return err
 	}
+	if len(data) == 0 {
+		return error.New("tableACL config file is empty")
+	}
+
 	config := &tableaclpb.Config{}
 	if err := config.UnmarshalVT(data); err != nil {
 		// try to parse tableacl as json file

go/vt/vttablet/tabletserver/tabletserver.go

@@ -368,7 +368,7 @@ func (tsv *TabletServer) initACL(tableACLConfigFile string, enforceTableACLConfi
 		},
 	)
 	// Log failure if either there was a problem loading the ACL, or if the ACL is empty
-	if err != nil || tableacl.GetCurrentConfig().String() == "" {
+	if err != nil {
 		log.Errorf("Fail to initialize Table ACL: %v", err)
 		if enforceTableACLConfig {
 			log.Exit("Need a valid initial Table ACL when enforce-tableacl-config is set, exiting.")