modules: services: gitea: change domain to 'git.*'

Because cool URLs don't change [1], setup a re-directed for it.

[1]: https://www.w3.org/Provider/Style/URI.html

modules/services/gitea/default.nix

@@ -50,7 +50,7 @@ in
     services.gitea =
       let
         inherit (config.networking) domain;
-        giteaDomain = "gitea.${domain}";
+        giteaDomain = "git.${domain}";
       in
       {
         enable = true;
@@ -112,11 +112,16 @@ in
     };
     users.groups.git = { };
 
-    # Proxy to Gitea
     my.services.nginx.virtualHosts = [
+      # Proxy to Gitea
+      {
+        subdomain = "git";
+        inherit (cfg) port;
+      }
+      # Redirect `gitea.` to actual forge subdomain
       {
         subdomain = "gitea";
-        inherit (cfg) port;
+        redirect = config.services.gitea.rootUrl;
       }
     ];
 

modules/services/nginx/default.nix

@@ -26,6 +26,15 @@ let
         '';
       };
 
+      redirect = mkOption {
+        type = with types; nullOr str;
+        default = null;
+        example = "https://example.com";
+        description = ''
+          Which domain to redirect to (301 response), for this virtual host.
+        '';
+      };
+
       root = mkOption {
         type = with types; nullOr path;
         default = null;
@@ -176,7 +185,7 @@ in
     assertions = [ ]
       ++ (lib.flip builtins.map cfg.virtualHosts ({ subdomain, ... } @ args:
       let
-        conflicts = [ "port" "root" ];
+        conflicts = [ "port" "root" "redirect" ];
         optionsNotNull = builtins.map (v: args.${v} != null) conflicts;
         optionsSet = lib.filter lib.id optionsNotNull;
       in
@@ -249,6 +258,10 @@ in
               (lib.optionalAttrs (args.root != null) {
                 inherit (args) root;
               })
+              # Redirect to a different domain
+              (lib.optionalAttrs (args.redirect != null) {
+                locations."/".return = "301 ${args.redirect}$request_uri";
+              })
               # VHost specific configuration
               args.extraConfig
               # SSO configuration