Add backups for terraria servers

roles/terraria/tasks/main.yml

@@ -88,6 +88,26 @@
             owner: terraria
             group: ter-admin
   become: yes
+- name: Set up backups
+  block:
+    - name: Create backups directory
+      file:
+        state: directory
+        mode: "0700"
+        path: "{{ terraria_root }}/{{ terraria_name }}/backups"
+        owner: terraria
+        group: ter-admin
+    - name: Template out backup script
+      template:
+        src: "backup.sh"
+        dest: "{{ terraria_root }}/{{ terraria_name }}/backup.sh"
+        mode: "0700"
+    - name: Set up backup cronjob
+      cron:
+        minute: "0"
+        hour: "/2"
+        name: "ansible-backup-terraria-{{ terraria_name }}"
+        job: "{{ terraria_root }}/{{ terraria_name }}/backup.sh >> {{ terraria_root }}/{{ terraria_name }}/backups.log 2>&1"
 - name: Enable service
   systemd:
     name: "terraria@{{ terraria_name }}"

roles/terraria/templates/backup.sh

@@ -0,0 +1,44 @@
+#! /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="$TERRARIADIR/backups"
+retention=84 # 2-hour intervals, 7 days
+
+# Sanity checks
+if ! [ -d "$OUTDIR" ]; then
+	if ! mkdir "$OUTDIR"; then
+		log "Unable to find or create output directory: $OUTDIR"
+		return 2
+	fi
+fi
+# Enforce permissions on our output directory since the terraria user will need them
+chown root.git "$OUTDIR"
+chmod 770 "$OUTDIR"
+
+# Purge oldest backup if we need to
+currentbackupcount="$(ls -1 "$OUTDIR" | wc -l)"
+if (( currentbackupcount >= retention )); then
+	lastbackup="$(find "$OUTDIR" -name \*.zip 2>/dev/null | sort | head -n 1)"
+	if [ -f "$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
+