better arg checking

diff --git a/btrbk-run b/btrbk-run
index fa20061128281857e82fcfd444225cb147e4158e..3ec2221d1238b22ab596f71b47e90f54a68365c1 100644 (file)
--- a/btrbk-run
+++ b/btrbk-run
@@ -150,9 +150,18 @@ while true; do
   esac
 done
 
-# usefull commands are resume and archive
+# only tested commands are resume and archive
 cmd_arg=${1:-run}
 
+case $cmd_arg in
+  run|resume|archive) : ;;
+  *) die "untested command arg" ;;
+esac
+
+if (( $# > 1 )); then
+  die: "only 1 nonoption arg is supported"
+fi
+
 if [[ -v targets && $source ]]; then
   die "error: -t and -s are mutually exclusive"
 fi