#!/usr/bin/env bash

# To deploy using cron:
#
# sudo crontab -l | tail -n1
# */5 * * * * /home/ubuntu/docker_prune.sh >/dev/null 2>&1

USED_SPACE=$(df -h | grep -viE "(tmpfs|loop)" | awk '{print $5}' | grep -v Us | grep -vi loop |sort -rV | head -n1 | tr -d '%')

DISK_LIMIT_PERCENTAGE=60

if [[ "$USED_SPACE" -gt "$DISK_LIMIT_PERCENTAGE" ]]; then
  echo "Deleting docker unused images..."
  docker system prune --all --force
  docker images -q --filter "dangling=true" | xargs -r docker rmi
else
  echo "Do nothing!"
fi