added error & check_internet functions to updater

update_portainer.sh

@@ -1,8 +1,26 @@
 #!/bin/bash
+
+function error {
+  echo -e "\\e[91m$1\\e[39m"
+  exit 1
+}
+
+function check_internet() {
+  printf "Checking if you are online..."
+  wget -q --spider http://github.com
+  if [ $? -eq 0 ]; then
+    echo "Online. Continuing."
+  else
+    error "Offline. Go connect to the internet then run the script again."
+  fi
+}
+
+check_internet
+
 portainer_pid=`docker ps | grep portainer-ce | awk '{print $1}'`
 portainer_name=`docker ps | grep portainer-ce | awk '{print $2}'`
 
-sudo docker stop $portainer_pid
-sudo docker rm $portainer_pid
-sudo docker rmi $portainer_name
-sudo docker run -d -p 9000:9000 --name=portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce:latest
+sudo docker stop $portainer_pid || error "Failed to stop portainer!"
+sudo docker rm $portainer_pid || error "Failed to remove portainer container!"
+sudo docker rmi $portainer_name || error "Failed to remove/untag images from the container!"
+sudo docker run -d -p 9000:9000 --name=portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce:latest || error "Failed to execute newer version of Portainer!"