Funds validator if balance falls below a certain threshold

fv.sh

#!/bin/bash

SOLANA=/home/$USER/.local/share/solana/install/active_release/bin/solana
WALLET=/home/$USER/wallet.json
FUND_AMOUNT=5
THRESHOLD=6
# enter validator identity here
PUBLIC_KEY=
VALIDATOR_BALANCE=$(${SOLANA} balance "${PUBLIC_KEY}" | tr -d ' SOL')

# check if wallet can fund the validator
function check_wallet_balance() {
  WALLET_BALANCE=$(${SOLANA} -k ${WALLET} balance | tr -d ' SOL')
  if [[ $(echo "${WALLET_BALANCE} < ${THRESHOLD}" | bc) -eq 1 ]]; then
    echo "Wallet balance ${WALLET_BALANCE} SOL (below threshold of ${THRESHOLD})"
    echo "Cannot fund Validator! Please top off your wallet!"
    exit 1
  fi
}

function fund_validator() {
  # check if validator balance is below threshold
  if [[ $(echo "${VALIDATOR_BALANCE} < ${THRESHOLD}" | bc) -eq 1 ]]; then
    echo "Validator balance ${VALIDATOR_BALANCE} SOL (below threshold of ${THRESHOLD})"

    # automatically fund from wallet
    echo "Transferring ${FUND_AMOUNT} SOL..."
    if ${SOLANA} -k ${WALLET} transfer "${PUBLIC_KEY}" ${FUND_AMOUNT}; then
      echo "Successfully funded validator with ${FUND_AMOUNT} SOL"
      balance=$(${SOLANA} balance "${PUBLIC_KEY}" | tr -d ' SOL')
      echo "New validator balance: $balance SOL"

      # proactively check if wallet balance is now below funding threshold
     check_wallet_balance
    else
      # solana transfer failed for some reason
      echo "Failed to fund validator!"
      exit 1
    fi
  else
    # validator balance is fine - show balances
    echo "Validator balance ${VALIDATOR_BALANCE} SOL (above threshold of ${THRESHOLD})"
    echo "Wallet balance    ${WALLET_BALANCE} SOL (above threshold of ${THRESHOLD})"
    echo "(No action needed)"
  fi
}

function main() {
  check_wallet_balance
  fund_validator
}

main