Make matrix backups

roles/matrix/tasks/main.yml

@@ -89,4 +89,9 @@
             group: "root"
           notify: restart synapse
       when: not p.stat.exists
+    - name: Template out backup module
+      template:
+        src: "backup.sh"
+        dest: "/opt/backups/modules/{{ matrix_url }}.sh"
+        mode: "0600"
   become: yes

roles/matrix/templates/backup.sh

@@ -0,0 +1,38 @@
+#! /bin/bash
+#
+# synapse.sh
+# Backup script for Synapse. 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 "$OUTDIR/{{ matrix_url }}-$(date -Iseconds).tar.gz" "/var/lib/matrix-synapse/" "/etc/matrix-synapse/"
+