Add backups for Minecraft instances

gameservers.yml

@@ -3,6 +3,8 @@
 ---
 - hosts: game1.9iron.club
   roles:
+    - role: backups
+      tags: [ backups ]
     - role: minecraft
       vars:
         mcname: "rotary-main"

roles/minecraft/tasks/main.yml

@@ -95,9 +95,16 @@
             dest: "/var/minecraft/{{ mcname }}/eula.txt"
   become: yes
   become_user: minecraft
-- name: Enable service
-  systemd:
-    name: "minecraft@{{ mcname }}"
-    enabled: yes
-    state: started
+- name: Set up system
+  block:
+    - name: Enable service
+      systemd:
+        name: "minecraft@{{ mcname }}"
+        enabled: yes
+        state: started
+    - name: Template out backup module
+      template:
+        src: "backup.sh"
+        dest: "/opt/backups/modules/minecraft-{{ mcname }}.sh"
+        mode: "0600"
   become: yes

roles/minecraft/templates/backup.sh

@@ -0,0 +1,38 @@
+#! /bin/bash
+#
+# minecraft.sh
+# Backup script for Minecraft. 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 OUTDIR="$BACKUPSDIR/{{ mcname }}"
+retention=7 # 7-day retention period
+
+# Sanity checks
+if [ -z "$BACKUPSDIR" ]; then
+	log "BACKUPSDIR was undefined. Run the main backup script instead of this one."
+	return 1
+fi
+if ! [ -d "$OUTDIR" ]; then
+	if ! mkdir "$OUTDIR"; then
+		log "Unable to find or create output directory: $OUTDIR"
+		return 2
+	fi
+fi
+
+# Purge oldest backup if we need to
+currentbackupcount="$(ls -1 "$OUTDIR" | wc -l)"
+if (( currentbackupcount >= retention )); then
+	lastbackup="$(find "$OUTDIR" -name \*.tar.gz 2>/dev/null | sort | head -n 1)"
+	if [ -f "$lastbackup" ]; then
+		log "Removing old backup: $lastbackup"
+		rm "$lastbackup"
+	fi
+fi
+# WE MAKE BACKUP NOW SERGEI
+tar czf "$OUTDIR/{{ mcname }}-$(date -Iseconds)-world.tar.gz" "/var/minecraft/{{ mcname }}/world"
+