Don't check compose twice on ethd update (eth-educators#1418)

ethd

@@ -67,19 +67,21 @@ determine_compose() {
   else
     __compose_exe="docker-compose"
     __old_compose=1
-    __compose_version=$($__maybe_sudo docker-compose --version | sed -n -E -e "s/.*version [v]?([0-9.-]*).*/\1/ip")
-    echo
-    echo "You are using docker-compose ${__compose_version}, which is unsupported by Docker, Inc. from July 2023 on"
-    echo "eth-docker will stop supporting it with Dencun, sometime fall 2023."
-    echo ""
-    echo "It is recommended that you replace compose V1 with compose V2."
-    while true; do
-      read -rp "Do you want to update compose to V2? (yes/no) " yn
-      case $yn in
-        [Nn]* ) echo "Please be sure to update docker-compose yourself!"; break;;
-         * ) upgrade_compose; break;;
-      esac
-    done
+    if [ -z "${ETHDSECUNDO-}" ]; then # Don't run this twice
+      __compose_version=$($__maybe_sudo docker-compose --version | sed -n -E -e "s/.*version [v]?([0-9.-]*).*/\1/ip")
+      echo
+      echo "You are using docker-compose ${__compose_version}, which is unsupported by Docker, Inc. from July 2023 on"
+      echo "eth-docker will stop supporting it with Dencun, sometime fall 2023."
+      echo ""
+      echo "It is recommended that you replace compose V1 with compose V2."
+      while true; do
+        read -rp "Do you want to update compose to V2? (yes/no) " yn
+        case $yn in
+          [Nn]* ) echo "Please be sure to update docker-compose yourself!"; break;;
+           * ) upgrade_compose; break;;
+        esac
+      done
+    fi
   fi
 
   if [ -n "$__maybe_sudo" ]; then