nixos/evdevremapkeys: init

Add a service for evdevremapkeys (already packaged), a daemon for
remapping keyboard events

nixos/doc/manual/release-notes/rl-2305.section.md

@@ -83,6 +83,8 @@ In addition to numerous new and updated packages, this release has the following
 
 - [gitea-actions-runner](https://gitea.com/gitea/act_runner), a CI runner for Gitea/Forgejo Actions. Available as [services.gitea-actions-runner](#opt-services.gitea-actions-runner.instances).
 
+- [evdevremapkeys](https://github.com/philipl/evdevremapkeys), a daemon to remap key events. Available as [services.evdevremapkeys](#opt-services.evdevremapkeys.enable).
+
 - [gmediarender](https://github.com/hzeller/gmrender-resurrect), a simple, headless UPnP/DLNA renderer.  Available as [services.gmediarender](options.html#opt-services.gmediarender.enable).
 
 - [go2rtc](https://github.com/AlexxIT/go2rtc), a camera streaming appliation with support for RTSP, WebRTC, HomeKit, FFMPEG, RTMP and other protocols. Available as [services.go2rtc](options.html#opt-services.go2rtc.enable).

nixos/modules/module-list.nix

@@ -633,6 +633,7 @@
   ./services/misc/etcd.nix
   ./services/misc/etebase-server.nix
   ./services/misc/etesync-dav.nix
+  ./services/misc/evdevremapkeys.nix
   ./services/misc/felix.nix
   ./services/misc/freeswitch.nix
   ./services/misc/fstrim.nix

nixos/modules/services/misc/evdevremapkeys.nix

@@ -0,0 +1,59 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+let
+  format = pkgs.formats.yaml { };
+  cfg = config.services.evdevremapkeys;
+
+in
+{
+  options.services.evdevremapkeys = {
+    enable = mkEnableOption (lib.mdDoc ''evdevremapkeys'');
+
+    settings = mkOption {
+      type = format.type;
+      default = { };
+      description = lib.mdDoc ''
+        config.yaml for evdevremapkeys
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    boot.kernelModules = [ "uinput" ];
+    services.udev.extraRules = ''
+      KERNEL=="uinput", MODE="0660", GROUP="input"
+    '';
+    users.groups.evdevremapkeys = { };
+    users.users.evdevremapkeys = {
+      description = "evdevremapkeys service user";
+      group = "evdevremapkeys";
+      extraGroups = [ "input" ];
+      isSystemUser = true;
+    };
+    systemd.services.evdevremapkeys = {
+      description = "evdevremapkeys";
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig =
+        let
+          config = format.generate "config.yaml" cfg.settings;
+        in
+        {
+          ExecStart = "${pkgs.evdevremapkeys}/bin/evdevremapkeys --config-file ${config}";
+          User = "evdevremapkeys";
+          Group = "evdevremapkeys";
+          StateDirectory = "evdevremapkeys";
+          Restart = "always";
+          LockPersonality = true;
+          MemoryDenyWriteExecute = true;
+          NoNewPrivileges = true;
+          PrivateNetwork = true;
+          PrivateTmp = true;
+          ProtectControlGroups = true;
+          ProtectHome = true;
+          ProtectKernelTunables = true;
+          ProtectSystem = true;
+        };
+    };
+  };
+}