From 4ec6492b3b2ec896035801b7b090dccc4b5ba797 Mon Sep 17 00:00:00 2001
From: Izorkin <izorkin@elven.pw>
Date: Thu, 8 May 2025 12:32:42 +0300
Subject: [PATCH] nixos/mastodon: add option elasticsearch.prefix

---
 nixos/modules/services/web-apps/mastodon.nix | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/nixos/modules/services/web-apps/mastodon.nix b/nixos/modules/services/web-apps/mastodon.nix
index 80352fc4c920..da6a09a00101 100644
--- a/nixos/modules/services/web-apps/mastodon.nix
+++ b/nixos/modules/services/web-apps/mastodon.nix
@@ -55,6 +55,9 @@ let
     // lib.optionalAttrs cfg.smtp.authenticate { SMTP_LOGIN = cfg.smtp.user; }
     // lib.optionalAttrs (cfg.elasticsearch.host != null) { ES_HOST = cfg.elasticsearch.host; }
     // lib.optionalAttrs (cfg.elasticsearch.host != null) { ES_PORT = toString cfg.elasticsearch.port; }
+    // lib.optionalAttrs (cfg.elasticsearch.host != null && cfg.elasticsearch.prefix != null) {
+      ES_PREFIX = cfg.elasticsearch.prefix;
+    }
     // lib.optionalAttrs (cfg.elasticsearch.host != null) { ES_PRESET = cfg.elasticsearch.preset; }
     // lib.optionalAttrs (cfg.elasticsearch.user != null) { ES_USER = cfg.elasticsearch.user; }
     // cfg.extraConfig;
@@ -670,6 +673,16 @@ in
           default = 9200;
         };
 
+        prefix = lib.mkOption {
+          description = ''
+            If provided, adds a prefix to indexes in Elasticsearch. This allows to use the same
+            Elasticsearch cluster between different projects or Mastodon servers.
+          '';
+          type = lib.types.nullOr lib.types.str;
+          default = null;
+          example = "mastodon";
+        };
+
         preset = lib.mkOption {
           description = ''
             It controls the ElasticSearch indices configuration (number of shards and replica).