Change input parameters structure.

Signed-off-by: Vittorio Cozzolino <vittorio.cozzolino@huawei.com>

examples/build_image.sh

@@ -14,34 +14,44 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+
+# Reset in case getopts has been used previously in the shell
+OPTIND=1
+
 usage()
 {
    echo ""
-   echo "Usage: $0 -t type -r repository"
-   echo -e "\t-t The type parameters allows to select which Sedna example to build (joint_inference, federated_learning, etc..).
-            It is possible to pass multiple folders by passing a list such as: \"dir_1 dir_2 .. \"."
+   echo "Usage: $0 -r repository incremental_learning ..."
    echo -e "\t-r The repository parameters allows to select a private Docker repository to upload the images to."
+   echo -e "\tThe script expects a list of Sedna example to build (joint_inference, federated_learning, etc..).
+         It is possible to select multiple folders by providing a list such as: dir_1 dir_2 ...
+         If no input is provided, it will automayically build all available examples"
    exit 1 # Exit script after printing help
 }
 
-while getopts "t:r:" opt
+while getopts "r:" opt
 do
    case "$opt" in
-      t ) type=( "$OPTARG" ) ;;
       r ) IMAGE_REPO="$OPTARG" ;;
       ? ) usage ;; # Print usage in case parameter is non-existent
    esac
 done
 
+shift $((OPTIND-1))
+
+[ "${1:-}" = "--" ] && shift
+
+type=$@
+
 if [ -z "$type" ]
 then
-   echo "No example type specified, building all example images.."
+   echo "No example directories specified, building all example images.."
    type="all"
 fi
 
 if [ -z "$IMAGE_REPO" ]
 then
-   echo "Using default Docker hub..";
+   echo "Using default Docker hub";
    IMAGE_REPO="kubeedge"
 fi