vhbackup.py

#!/bin/env python3

import os, sys, datetime, lzma, tarfile

MAX_BACKUPS = 10
BACKUP_DIR = "backups"
SERVER_DIR = "" # set your server installation directory here, eg. /home/vhserver
DIRS_TO_BACKUP = [
	"lgsm/config-lgsm",
	"savedir",
]

if not SERVER_DIR:
	print("Set your server directory!!")
	exit(1)

os.chdir(SERVER_DIR)

log_file = open("backup-log.txt", "a+")
archive_name = "valheim-backup-" + datetime.datetime.utcnow().strftime("%Y-%m-%d-%H%M%S") + ".tar.xz"

def log(s):
	log_file.write(f"{datetime.datetime.now()} {str(s)}\n")

def get_size(start_path):
	total_size = 0
	for dirpath, dirnames, filenames in os.walk(start_path):
		for f in filenames:
			fp = os.path.join(dirpath, f)
			if not os.path.islink(fp):
				total_size += os.path.getsize(fp)

	if total_size < 1024:
		return "{:.2f}".format(total_size)+"B"
	total_size /= 1024
	if total_size < 1024:
		return "{:.2f}".format(total_size)+"KB"
	total_size /= 1024
	if total_size < 1024:
		return "{:.2f}".format(total_size)+"MB"
	total_size /= 1024
	return "{:.2f}".format(total_size)+"GB"

log("Beginning backup")

try:

	backups = os.listdir(BACKUP_DIR)

	if len(backups) >= MAX_BACKUPS:
		log(f"Backup limit reached (>={MAX_BACKUPS})")

		oldest_file = ""
		oldest_time = 0
		for fp in backups:
			fp = os.path.join(BACKUP_DIR, fp)
			mtime = os.path.getmtime(fp)
			if not oldest_file or mtime < oldest_time:
				oldest_file = fp
				oldest_time = mtime

		log("Removing oldest backup "+oldest_file)
		os.remove(oldest_file)

	with tarfile.open(os.path.join(BACKUP_DIR, archive_name), "w:xz") as archive:
		for d in DIRS_TO_BACKUP:
			if not os.path.exists(d) or not os.path.isdir(d):
				log(d+" is not a directory")
				continue
			log(f"Adding {d} to archive ({get_size(d)})")
			archive.add(d)

	log("Complete")
except Exception as e:
	log(f"Error completing backup: {str(e)}")
	exit(1)