new: added variable ``$CHARM_NAME`` in hooks.

bin/compose

@@ -724,6 +724,7 @@ run_service_hook () {
             Wrap -d "$YELLOW$action$NORMAL hook of charm $DARKYELLOW$charm$NORMAL" <<EOF || return 1
             cd "$CHARM_STORE/$charm"
             SERVICE_NAME=$subservice \
+                        CHARM_NAME="$charm" \
                         PROJECT_NAME=$PROJECT_NAME \
                         DOCKER_BASE_IMAGE=$(service_base_docker_image "$charm") \
                         SERVICE_DATASTORE="$DATASTORE/$charm" \