boreal: install chrysalis and udev rules

hosts/boreal/default.nix

@@ -111,6 +111,14 @@ in
   };
   my.displayManager.sddm.enable = true;
 
+  environment.systemPackages = with pkgs; [
+    chrysalis
+  ];
+
+  services.udev.packages = with pkgs; [
+    packages.kaleidoscope-udev-rules
+  ];
+
   hardware.bluetooth = {
     enable = true;
     powerOnBoot = true;

pkgs/default.nix

@@ -1,4 +1,5 @@
 { pkgs }:
 {
   sddm-sugar-candy = pkgs.callPackage ./sddm-sugar-candy {};
+  kaleidoscope-udev-rules = pkgs.callPackage ./kaleidoscope-udev-rules {};
 }

pkgs/kaleidoscope-udev-rules/60-kaleidoscope.rules

@@ -0,0 +1,16 @@
+## This file sets up a few things for selected Kaleidoscope-powered keyboards:
+## - We first symlink the device to a more friendly name, based on the product
+##   name.
+## - We then ask ModemManager to ignore the serial ports on the device, and not
+##   consider them a candidate.
+## - We also tell systemd to grant access to the device (via ACLs) to the user
+##   at-seat.
+##
+## For more information about the access part, see the following resources:
+##  - https://github.com/systemd/systemd/issues/4288
+##  - https://www.freedesktop.org/software/systemd/man/sd-login.html
+
+SUBSYSTEMS=="usb", ATTRS{idVendor}=="1209", ATTRS{idProduct}=="2300", SYMLINK+="model01", ENV{ID_MM_DEVICE_IGNORE}:="1", ENV{ID_MM_CANDIDATE}:="0", TAG+="uaccess", TAG+="seat"
+SUBSYSTEMS=="usb", ATTRS{idVendor}=="1209", ATTRS{idProduct}=="2301", SYMLINK+="model01", ENV{ID_MM_DEVICE_IGNORE}:="1", ENV{ID_MM_CANDIDATE}:="0", TAG+="uaccess", TAG+="seat"
+SUBSYSTEMS=="usb", ATTRS{idVendor}=="1209", ATTRS{idProduct}=="2302", SYMLINK+="Atreus2", ENV{ID_MM_DEVICE_IGNORE}:="1", ENV{ID_MM_CANDIDATE}:="0", TAG+="uaccess", TAG+="seat"
+SUBSYSTEMS=="usb", ATTRS{idVendor}=="1209", ATTRS{idProduct}=="2303", SYMLINK+="Atreus2", ENV{ID_MM_DEVICE_IGNORE}:="1", ENV{ID_MM_CANDIDATE}:="0", TAG+="uaccess", TAG+="seat"

pkgs/kaleidoscope-udev-rules/default.nix

@@ -0,0 +1,25 @@
+{ stdenv, lib }:
+
+let
+  pname = "kaleidoscope-udev-rules";
+  version = "0.8.4";
+in stdenv.mkDerivation rec {
+  name = "${pname}-${version}";
+
+  dontBuild = true;
+
+  src = ./.;
+
+  # FIXME: fetch from GitHub properly
+  installPhase = ''
+    mkdir -p $out/lib/udev/rules.d
+    cp ./60-kaleidoscope.rules $out/lib/udev/rules.d/
+  '';
+
+  meta = with lib; {
+    description = "udev rules for kaleidoscope firmware keyboards";
+    homepage = "https://github.com/keyboardio/Chrysalis";
+    license = licenses.gpl3;
+    platforms = [ "x86_64-linux" ];
+  };
+}