flake: Add output for options.json

flake.nix

@@ -108,8 +108,26 @@
       pkgs = importNixpkgs system [rust-overlay.overlays.default];
       treefmtEval = loadTreefmt pkgs;
       toplevel = name: config: nameValuePair "nixosConfigs/${name}" config.config.system.build.toplevel;
+
+        dummy = import (nixpkgs + "/nixos/lib/eval-config.nix") {
+          inherit system;
+          modules = builtins.attrValues self.nixosModules ++ [
+            {
+              networking = {
+                domain = "invalid";
+                hostName = "options";
+              };
+            }
+          ];
+        };
+        options = builtins.mapAttrs (name: _: dummy.options.services.${name} or {}) self.nixosModules;
     in {
-      packages = importPackages pkgs;
+      packages = (importPackages pkgs) // {
+       options = pkgs.runCommand "options.json" {
+          build = (pkgs.nixosOptionsDoc { inherit options; }).optionsJSON;
+        } "cp $build/share/doc/nixos/options.json $out";
+      };
+
       formatter = treefmtEval.config.build.wrapper;
       checks = mapAttrs' toplevel nixosConfigurations;
     });

modules/kbin.nix

@@ -100,6 +100,7 @@ in {
     };
 
     secrets = mkOption {
+      description = "Paths to files containing secrets, keyed by the respective environment variable.";
       type = submodule {
         freeformType = attrsOf (nullOr path);
 

modules/pretalx.nix

@@ -14,6 +14,7 @@
 
   inherit
     (lib)
+    literalExpression
     optionals
     modules
     types
@@ -201,6 +202,7 @@ in {
         type = nullOr str;
         default = null;
         example = "pretalx";
+        description = "Database user that pretalx should connect as.";
       };
 
       passwordFile = mkOption {