Free up space on your DIY helium hotspot

refresh-blockchain.sh

#!/bin/bash

# Download this script to your computer and upload it to your hotspot using scp
#  scp /Path/to/refresh-blockchain.sh hotspot_ssh_address:/home/pi
#
# SSH into hotspot, and edit your crontab (sudo crontab -e) and add this:
#  0 8 * * * /home/pi/refresh-blockchain.sh >> /home/pi/refresh-blockchain.log 2>&1

DATA_PATH=/home/pi/miner_data
DATA_BACKUP_PATH=/home/pi/miner_data_bak

percent_used_disk_space=$(df -Bm | grep /dev/root | egrep -o "[0-9]+%" | egrep -o "[0-9]+")
threshold=90

echo "Total disk space usage: $percent_used_disk_space%"

if (( $percent_used_disk_space >= $threshold )); then
  echo "Running low on space!"

  echo "Making a snapshot backup..."
  docker exec miner miner snapshot take /var/data/snapshot.bin

  echo "Stopping the miner..."
  docker stop miner

  echo "Moving $DATA_PATH TO $DATA_BACKUP_PATH"
  mv $DATA_PATH $DATA_BACKUP_PATH
  mkdir $DATA_PATH

  echo "Copying the keys over to new miner data folder"
  cp -r $DATA_BACKUP_PATH/miner $DATA_PATH

  echo "Moving the snapshot over"
  cp $DATA_BACKUP_PATH/snapshot.bin $DATA_PATH

  echo "Starting miner back up"
  docker start miner
  
  echo "Deleting backup folder."
  sudo rm -rf $DATA_BACKUP_PATH

  echo "Importing snapshot..."
  docker exec miner miner snapshot load /var/data/snapshot.bin

  echo "Deleting snapshot"
  rm $DATA_PATH/snapshot.bin

  disk_space=$(df -Bm | grep /dev/root | egrep -o "[0-9]+%")
  echo; echo "Complete! Total disk space usage: $disk_space"
fi