epm-upgrade: don't allow unknown options (ALT bug 41225)

bin/epm

@@ -470,6 +470,7 @@ check_filenames()
             pkg_urls="$pkg_urls $opt"
         else
             has_space "$opt" && warning "There are space(s) in package name '$opt', it is not supported. Skipped." && continue
+            # TODO: don't add unknown options (like -y, --unknown) to pkg_names
             pkg_names="$pkg_names $opt"
         fi
         quoted_args="$quoted_args \"$opt\""

bin/epm-upgrade

@@ -65,6 +65,11 @@ epm_upgrade()
 				(pkg_files=$pkg_files force="$force -F" epm_install)
 				return
 			elif [ -n "$pkg_names" ] ; then
+				# hack for https://bugzilla.altlinux.org/41225
+				case "$pkg_names" in
+					-*)
+						fatal "Option $pkg_names is not allowed here"
+				esac
 				load_helper epm-install
 				(pkg_names=$(get_only_installed_packages $pkg_names) epm_install)
 				return