Add backups to psql dbs

roles/postgresql/tasks/main.yml

@@ -15,4 +15,9 @@
         name: postgresql
         enabled: yes
         state: started
+    - name: Template out backup module
+      template:
+        src: backup.sh
+        dest: /opt/backup/modules/pgsql.sh
+        mode: "0600"
   become: yes

roles/postgresql/templates/backup.sh

@@ -0,0 +1,47 @@
+#! /bin/bash
+#
+# psql.sh
+# Backup script for PostgreSQL. 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="$BACKUPSDIR/psql"
+retention=5 # 5-day retention period
+
+# Sanity checks
+if [ -z "$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: $OUTDIR"
+		return 2
+	fi
+fi
+# Enforce permissions on our output directory since the git user will need them
+chown root. "$OUTDIR"
+chmod 770 "$OUTDIR"
+
+# Purge oldest backup if we need to
+currentbackupcount="$(ls -1 "$OUTDIR" | wc -l)"
+if (( currentbackupcount >= retention )); then
+	lastbackup="$(find "$OUTDIR" -name \*.pgdump.gz 2>/dev/null | sort | head -n 1)"
+	lastbackup="${lastbackup%-*.gz}"
+	if [ -f "$file" ]; then
+		log "Removing old backups for: $lastbackup"
+		for file in "$lastbackup"*; do
+			log "Removing old backup part: $file"
+			rm "$file"
+		done
+	fi
+fi
+# WE MAKE BACKUP NOW SERGEI
+date="$(date -Iseconds)"
+log "Creating DB backup"
+sudo -Hu postgres pg_dumpall | gzip > "$OUTDIR/pgdumpall-$date.pgdump.gz"
+