Implement --verify to simplify samegrading

usr/bin/sfos-upgrade

@@ -110,7 +110,14 @@ then
 else
   set_ssu="yes"
   ssu_set="$(ssu re | rev | cut -f 1 -d ' ' | rev)"
-  upgrade_release="$1"
+
+  if [ "$1" = "--verify" ]
+  then
+    upgrade_release=$installed_release
+  else
+    upgrade_release="$1"
+  fi
+
   shift
   if [ -n "$*" ]
   then
@@ -122,9 +129,10 @@ else
     true
     ;;
   -h|--help)
-    echo "Usage: $called [<version>]"
+    echo "Usage: $called [<version>|--verify]"
     echo "With a version number provided as parameter it sets SSU to this version and in release mode before upgrading.  This is the regular use case."
     echo "Without a version number it retrieves the one set for SSU to perform slightly relaxed checks, but does not alter SSU's settings for upgrading."
+    echo "With the --verify argument it performs a \"samegrade\" operation, upgrades the current version to the current version. Essentially, it makes sure that the current version is properly installed."
     exit 2
     ;;
   *)