bundles/postgresql: do a database dump before backing up the database

bundles/postgresql/items.py

@@ -56,6 +56,19 @@ files = {
     },
 }
 
+# FIXME currently we do not have a mechanism to use snapshot-backups of
+# zfs datasets.
+if True: # not node.has_bundle('zfs') and node.has_bundle('backup-client'):
+    files['/etc/backup-pre-hooks.d/90-postgresql-dump-all'] = {
+        'source': 'backup-pre-hook',
+        'content_type': 'mako',
+        'context': {
+            'databases': node.metadata.get('postgresql', {}).get('databases', {}).keys(),
+        },
+        'mode': '0700',
+    }
+    directories['/var/tmp/postgresdumps'] = {}
+
 postgres_roles = {
     'root': {
         'password': repo.vault.password_for('{} postgresql root'.format(node.name)),