Pretix: add pretix-dbvat plugin

Also overriding pretix tests until we can update. nixpkgs PR for the
plugin is pending.

Author: e1mo

hosts/goldberg/configuration.nix

@@ -8,14 +8,14 @@
     ./hardware-config.nix
     ../../services/mumble.nix
     ../../services/website.nix
-    ../../services/matrix
-    ../../services/vaultwarden.nix
-    ../../services/dokuwiki.nix
-    ../../services/freescout.nix
-    ../../services/hedgedoc.nix
+    #../../services/matrix
+    #../../services/vaultwarden.nix
+    #../../services/dokuwiki.nix
+    #../../services/freescout.nix
+    #../../services/hedgedoc.nix
     ../../services/pretix.nix
-    ../../services/pretalx.nix
-    ../../services/monitoring/server
+    #../../services/pretalx.nix
+    #../../services/monitoring/server
   ];
 
   system.stateVersion = "23.05";

packages/default.nix

@@ -185,4 +185,15 @@ final: prev:
   })];
 
   matrixjoinlink = final.callPackage ./matrixjoinlink {};
+
+  pretix = prev.pretix.overrideAttrs (oa: {
+    # Tests have been fixed in http://github.com/pretix/pretix/commit/5a5a551c21461d9ef36337480c9874d65a9fdba9
+    # but because we can't update currently, doing that manually.
+    disabledTests = (oa.disabledTests or []) ++ [
+      "test_english_no_region_set"
+      "test_english_region_US"
+      "test_german_region_US"
+    ];
+  });
+  pretix-dbvat = final.pretix.passthru.python.pkgs.callPackage ./pretix-dbvat.nix {};
 }

packages/pretix-dbvat.nix

@@ -0,0 +1,38 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  pretix-plugin-build,
+  setuptools,
+}:
+
+buildPythonPackage rec {
+  pname = "pretix-dbvat";
+  version = "1.1.0";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "pretix";
+    repo = "pretix-dbvat";
+    rev = "v${version}";
+    hash = "sha256-yAKqB0G2WyGqGogAxv8fI34gO6Wl/50sY/5rvWYH4Ho=";
+  };
+
+  build-system = [
+    pretix-plugin-build
+    setuptools
+  ];
+
+  doCheck = false; # no tests
+
+  pythonImportsCheck = [
+    "pretix_dbvat"
+  ];
+
+  meta = with lib; {
+    description = "Plugin for using Deutsche Bahn (DB) Event Discount (Veranstaltungsrabatt)";
+    homepage = "https://github.com/pretix/pretix-dbvat";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ e1mo ];
+  };
+}

services/pretix.nix

@@ -2,6 +2,7 @@
 , isDev
 , config
 , lib
+, pkgs
 , ... }:
 
 let
@@ -18,7 +19,7 @@ in {
         url = "https://${domain}";
         currency = "EUR";
         loglevel = if isDev then "INFO" else "WARNING";
-        plugins_default = "pretix.plugins.sendmail,pretix.plugins.statistics,pretix.plugins.ticketoutputpdf";
+        plugins_default = "pretix.plugins.sendmail,pretix.plugins.statistics,pretix.plugins.ticketoutputpdf,pretix.plugins.dbvat";
         plugins_exclude = "pretix.plugins.paypal,pretix.plugins.paypal2,pretix.plugins.stripe,pretix.plugins.banktransfer";
         audit_comments = true;
         obligatory_2fa = true;
@@ -54,6 +55,10 @@ in {
       };
     };
 
+    plugins = [
+      pkgs.pretix-dbvat
+    ];
+
     database.createLocally = true;
     nginx = {
       inherit domain;