ansible/roles/terraria/templates/backup.sh

#! /bin/bash
#
# terraria.sh
# Backup script for Gitea. Meant to be sourced by our main backup script
# Copyright (C) 2020 Vintage Salt <rehashedsalt@cock.li>
#
# Distributed under terms of the MIT license.
#

set -e

export TERRARIADIR="{{ terraria_root }}/{{ terraria_name }}"
export OUTDIR="$TERRARIADIR/backups"
retention=144 # 30-minute intervals, 3 days

# Helper functions
log() {
	[ -z "$1" ] && return 1
	printf "$(date -Iseconds): $1\n"
}

# Sanity checks
if ! [ -d "$OUTDIR" ]; then
	if ! mkdir "$OUTDIR"; then
		log "Unable to find or create output directory: $OUTDIR"
		return 2
	fi
fi
# Enforce permissions on our output directory since the terraria user will need them
chown terraria.ter-admin "$OUTDIR"
chmod 770 "$OUTDIR"

# Purge oldest backup if we need to
currentbackupcount="$(ls -1 "$OUTDIR" | wc -l)"
if (( currentbackupcount >= retention )); then
	lastbackup="$(find "$OUTDIR" -name \*.wld 2>/dev/null | sort | head -n 1)"
	if [ -f "$lastbackup" ]; then
		log "Removing old backup: $lastbackup"
		rm "$lastbackup"
	fi
fi
# WE MAKE BACKUP NOW SERGEI
if cd "$OUTDIR"; then
	log "Initiating terraria dump"
	su terraria -c "cp \"$TERRARIADIR/worlds/world.wld\" \"$OUTDIR/world-$(date -Iseconds).wld\""
else
	log "Could not change directory: $OUTDIR"
	return 3
fi