xapian indexes in dataset without snapshots

bundles/dovecot/files/dovecot.conf

@@ -6,7 +6,7 @@ ssl_cert = </var/lib/dehydrated/certs/${node.metadata.get('mailserver/hostname')
 ssl_key = </var/lib/dehydrated/certs/${node.metadata.get('mailserver/hostname')}/privkey.pem
 ssl_dh = </etc/dovecot/dhparam.pem
 ssl_client_ca_dir = /etc/ssl/certs
-mail_location = maildir:~
+mail_location = maildir:${node.metadata.get('mailserver/maildir')}/%u:INDEX=${node.metadata.get('mailserver/maildir')}/index/%u
 mail_plugins = fts fts_xapian
 
 namespace inbox {

bundles/dovecot/items.py

@@ -20,6 +20,10 @@ directories = {
         'owner': 'vmail',
         'group': 'vmail',
     },
+    '/var/vmail/index': {
+        'owner': 'vmail',
+        'group': 'vmail',
+    },
     '/var/vmail/sieve': {
         'owner': 'vmail',
         'group': 'vmail',

bundles/mailserver/metadata.py

@@ -33,6 +33,12 @@ defaults = {
                 'mountpoint': '/var/vmail',
                 'compression': 'on',
             },
+            'tank/vmail/index': {
+                'mountpoint': '/var/vmail/index',
+                'compression': 'on',
+                'com.sun:auto-snapshot': 'false',
+                'backup': False,
+            },
         },
     },
 }