Re-run the script as root instead of piping to bash

Signed-off-by: Viet Hung Nguyen <hvn@familug.org>

automated install/basic-install.sh

@@ -2623,8 +2623,16 @@ main() {
         # If the sudo command exists,
         if is_command sudo ; then
             printf "%b  %b Sudo utility check\\n" "${OVER}"  "${TICK}"
-            # Download the install script and run it with admin rights
-            exec curl -sSL https://raw.githubusercontent.com/pi-hole/pi-hole/master/automated%20install/basic-install.sh | sudo bash "$@"
+
+            # when run via curl piping
+            if [[ "$0" == "bash" ]]; then
+                # Download the install script and run it with admin rights
+                exec curl -sSL https://raw.githubusercontent.com/pi-hole/pi-hole/master/automated%20install/basic-install.sh | sudo bash "$@"
+            else
+                # when run via calling local bash script
+                exec sudo bash "$0" "$@"
+            fi
+
             exit $?
         # Otherwise,
         else