nixos/pretalx: add plugins option

Allow loading pretalx plugins in a declarative manner. They are passed
into the package dependencies at build time, so that collectstatic and
other django maintenance functions account for them, since we cannot
regenerate assets at runtime anyway.

1 files changed, 27 insertions, 8 deletions

diff --git a/nixos/modules/services/web-apps/pretalx.nix b/nixos/modules/services/web-apps/pretalx.nix
index d0b1512f77c59..1411d11982c87 100644
--- a/nixos/modules/services/web-apps/pretalx.nix
+++ b/nixos/modules/services/web-apps/pretalx.nix
@@ -11,14 +11,19 @@ let
 
   configFile = format.generate "pretalx.cfg" cfg.settings;
 
-  extras = cfg.package.optional-dependencies.redis
-    ++ lib.optionals (cfg.settings.database.backend == "mysql") cfg.package.optional-dependencies.mysql
-    ++ lib.optionals (cfg.settings.database.backend == "postgresql") cfg.package.optional-dependencies.postgres;
-
-  pythonEnv = cfg.package.python.buildEnv.override {
-    extraLibs = [ (cfg.package.python.pkgs.toPythonModule cfg.package) ]
-      ++ (with cfg.package.python.pkgs; [ gunicorn ]
-      ++ lib.optional cfg.celery.enable celery) ++ extras;
+  finalPackage = cfg.package.override {
+    inherit (cfg) plugins;
+  };
+
+  pythonEnv = finalPackage.python.buildEnv.override {
+    extraLibs = with finalPackage.python.pkgs; [
+      (toPythonModule finalPackage)
+      gunicorn
+    ]
+    ++ finalPackage.optional-dependencies.redis
+    ++ lib.optionals cfg.celery.enable [ celery ]
+    ++ lib.optionals (cfg.settings.database.backend == "mysql") finalPackage.optional-dependencies.mysql
+    ++ lib.optionals (cfg.settings.database.backend == "postgresql") finalPackage.optional-dependencies.postgres;
   };
 in
 
@@ -44,6 +49,20 @@ in
       description = "User under which pretalx should run.";
     };
 
+    plugins = lib.mkOption {
+      type = with lib.types; listOf package;
+      default = [];
+      example = lib.literalExpression ''
+        with config.services.pretalx.package.plugins; [
+          pages
+          youtube
+        ];
+      '';
+      description = ''
+        Pretalx plugins to install into the Python environment.
+      '';
+    };
+
     gunicorn.extraArgs = lib.mkOption {
       type = with lib.types; listOf str;
       default = [