Linux-Tech-Tips/Scripts/mc-backup.sh

#!/bin/usr/env bash

set -eou pipefail
#set -x

# The script creates backups of all save files in ~/.minecraft.
# Backups older than 1 day will be deleted except for the most recent one.
# Log files in ~/.minecraft that are older than 1 hour and larger than 1 GB will be deleted.

# Script assumes you have one save which is called "New World" (See line 41).

##################################################

## Write Log File

# Set directory for the log file
mkdir -p "/home/$user/.minecraft/logs"
log="/home/$user/.minecraft/logs/$(date +%Y-%m-%d_%H:%M).log"

# Redirect standard streams to the log file
exec >> >(tee -i "${log}")
exec 2>&1

##################################################

## Create Backup

# Change to directory
cd "/home/$user/.minecraft"

# Check if Minecraft is running (not the launcher)
if pgrep -f "minecraft.*java" > /dev/null; then

   # Determine variable for current date
   today=$(date +%Y-%m-%d_%H:%M)

   # Create directory with date
   mkdir -p "./backup/${today}"

   # Copy save file to new directory
   cp -r "./saves/New World/" "./backup/${today}"

   echo "Backup ${today} created."
fi

##################################################

## Delete Old Backups

cd "/home/$user/.minecraft/backup"

# Loop through all directories
for dir in *; do

   # Check if variable is a directory
   if [[ -d ${dir} ]]; then

      # Extract the date from the directory name
      dir_day=$(echo ${dir} | cut -d '_' -f1)

      # Determine the most recent directory
      dir_recent=$(ls -d ${dir_day}* | sort | tail -n 1)

      # Delete all directories except for the most recent one
      if [[ ${dir} != ${dir_recent} ]]; then

         # Check if directory is older than 12 hours
         find ${dir} -maxdepth 0 -type d -mmin  +720 -exec echo "Backup {} gelöscht." \; -exec rm -rf {} +
      fi
   fi
done

##################################################

## Delete Old Logs
find "/home/$user/.minecraft/" -name 'launcher_log*' -size +1G -mtime +1 -exec rm {} +

# Check if Minecraft and the launcher are not running
if ! pgrep -f "minecraft*.jar" > /dev/null && ! pgrep -f "minecraft-launcher" > /dev/null; then

   # Delete official logs that are larger than 1 GB and older than 1 hour
   find "/home/$user/.minecraft/" -name 'launcher_log*' -size +1G -mmin +60 -exec rm {} +

   # Delete logs from this script that are empty or older than 30 days
   find "/home/$user/.minecraft/logs" -type f -mtime +30 -exec rm {} +
   find "/home/$user/.minecraft/logs" -type f -empty -delete

fi