Polkadot updater

polkadot_updater.sh

#!/bin/bash

get_latest_release () {
  curl --silent "https://api.github.com/repos/paritytech/polkadot/releases/latest" | # Get latest release from GitHub api
    grep '"tag_name":' |                                            # Get tag line
    sed -E 's/.*"([^"]+)".*/\1/'                                    # Pluck JSON value
}

V=`get_latest_release`
SERVICE="polkadot-validator"

echo "#######################################"
echo "#           Polkadot Updater          #"
echo "#######################################"
echo
read -p "Do you want to upgrade to $V (y/N)? " -n 1 -r
echo    
echo
if [[ $REPLY =~ ^[Yy]$ ]]
then
   echo "Downloading to $HOME/polkadot.$V..."
   curl -sL https://github.com/paritytech/polkadot/releases/download/$V/polkadot -o $HOME/polkadot.$V
   chmod +x $HOME/polkadot.$V
   
   echo "Stopping the service $SERVICE.service..."
   sudo systemctl stop $SERVICE.service
   
   echo "Linking the new version to $HOME/polkadot..."
   rm $HOME/polkadot
   ln -s $HOME/polkadot.$V $HOME/polkadot
   
   echo "Starting the service $SERVICE.service..."
   sudo systemctl start $SERVICE.service
   
   echo "Printing the status now."
   sudo systemctl status $SERVICE.service --no-pager
   
   echo -e "\n\nUse 'sudo journalctl -f -u $SERVICE' to check the logs."
   echo -e "\nPolkadot updated to $V. Byez!"
fi