grubby-bls: error if args or remove-args is used without update-kernel

The --args and --remove-args options can only be used when the kernel to
update is specified using the --update-kernel option. Print an error if
the latter option is not provided.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>

grubby-bls

@@ -706,6 +706,10 @@ while [ ${#} -gt 0 ]; do
     shift
 done
 
+if [[ -z $update_kernel ]] && [[ -n $args || -n $remove_args ]]; then
+    print_error "no action specified"
+fi
+
 if [[ -z $blsdir ]]; then
     blsdir="/boot/loader/entries"
 fi

grubby.spec

@@ -1,6 +1,6 @@
 Name: grubby
 Version: 8.40
-Release: 26%{?dist}
+Release: 27%{?dist}
 Summary: Command line tool for updating bootloader configs
 License: GPLv2+
 URL: https://github.com/rhinstaller/grubby
@@ -132,6 +132,9 @@ current boot environment.
  %{_mandir}/man8/*.8*
 
 %changelog
+* Thu Feb 14 2019 Javier Martinez Canillas <javierm@redhat.com> - 8.40-27
+- grubby-bls: error if args or remove-args is used without update-kernel
+
 * Tue Feb 05 2019 Javier Martinez Canillas <javierm@redhat.com> - 8.40-26
 - Fix GCC warnings about possible string truncations and buffer overflows
 - grubby-bls: unset default entry if is the one being removed