bundles/nginx: use metadata reactor to determine index files

bundles/nginx/files/site_template

@@ -1,7 +1,7 @@
 server {
     server_name ${domain};
-    root ${webroot if webroot else '/var/www/{}/'.format(domain)};
-    index ${index if index else 'index.html index.htm'};
+    root ${webroot if webroot else '/var/www/{}/'.format(vhost)};
+    index ${' '.join(index)};
 
 % if node.metadata['nginx']['use_ssl_for_all_connections']:
     listen 443 ssl http2;

bundles/nginx/items.py

@@ -58,7 +58,10 @@ for vhost, config in node.metadata.get('nginx', {}).get('vhosts', {}).items():
     files['/etc/nginx/sites/{}'.format(vhost)] = {
         'source': 'site_template',
         'content_type': 'mako',
-        'context': config,
+        'context': {
+            'vhost': vhost,
+            **config,
+        },
         'needs': set(),
         'triggers': {
             'svc_systemd:nginx:restart',

bundles/nginx/metadata.py

@@ -46,3 +46,27 @@ def letsencrypt(metadata):
             },
         },
     }
+
+
+@metadata_reactor
+def index_files(metadata):
+    vhosts = {}
+
+    for vhost, config in metadata.get('nginx/vhosts', {}).items():
+        vhosts[vhost] = {
+            'index': [
+                'index.html',
+                'index.htm',
+            ],
+        }
+
+        if config.get('php', False):
+            # If we're using PHP, make sure index.php is tried first
+            vhosts[vhost]['index'].insert(0, 'index.php')
+
+
+    return {
+        'nginx': {
+            'vhosts': vhosts,
+        },
+    }

nodes/htz/ex42-1048908.py

@@ -192,7 +192,6 @@ nodes['htz.ex42-1048908'] = {
                 },
                 'postfixadmin.mx0.kunbox.net': {
                     'webroot': '/srv/postfixadmin/public/',
-                    'index': 'index.php',
                     'php': True, # FIXME this assumes php 7.3 is installed and configured already
                 },
                 'rspamd.mx0.kunbox.net': {
@@ -217,11 +216,9 @@ nodes['htz.ex42-1048908'] = {
                     },
                 },
                 'webmail.mx0.kunbox.net': {
-                    'index': 'index.php',
                     'php': True,
                 },
                 'wiki.franzi.business': {
-                    'index': 'doku.php',
                     'extras': True,
                     'php': True,
                     'webroot_config': {