Backup minecraft files

gistfile1.rb

#!/usr/bin/env ruby

# minecraft source and backup destination directories
SRC = '/home/force/minecraft'
DST = '/home/force/mincraft_backup'

# maximimum total size for all backups in bytes
MAX = 10**9 # about 1 GB

def backup
  timestamp = Time.now.to_s[0..-7].gsub(/ /, '_')
  Dir.mkdir DST unless Dir.exists? DST
  target = "#{DST}/minecraft_backup_#{timestamp}.tar.gz"
  puts "Backuping up #{SRC} to #{target}..."
  `tar cjf #{target} #{SRC}`
  if $?.exitstatus == 0
    puts "Backup successful"
  else
    puts "Backup failed"
  end
end

def prune_old_backups
  puts "Pruning old backups..."
  while total_backup_size > MAX
    `rm #{DST}/#{oldest_backup}`
    puts "Deleted #{DST}/#{oldest_backup}"
  end
end

def total_backup_size
  `du -s #{DST}`.match(/^(\d+)/)[1].to_i
end

def oldest_backup
  `ls -t #{DST}`.split("\n").last
end

def stop_minecraft
  puts "Killing Minecraft..."
  pid = `ps -ef|grep minecraft_server.jar|grep -v grep|awk '{print $2}'`
  `kill #{pid}`
  puts "Minecraft killed. :("
end

def start_minecraft
  puts "Starting Minecraft..."
  `nohup java -Xms1G -Xmx2G -jar /home/force/minecraft/minecraft_server.jar nogui &`
  puts "Minecraft started. :)"
end

stop_minecraft
backup
start_minecraft
prune_old_backups