02cf88bb76
GitOrigin-RevId: c4a0efdd5a728e20791b8d8d2f26f90ac228ee8d
215 lines
6.7 KiB
Nix
215 lines
6.7 KiB
Nix
{ config, lib, pkgs, utils, ... }:
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with lib;
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let
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cfg = config.services.kanata;
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keyboard = {
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options = {
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devices = mkOption {
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type = types.addCheck (types.listOf types.str)
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(devices: (length devices) > 0);
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example = [ "/dev/input/by-id/usb-0000_0000-event-kbd" ];
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# TODO replace note with tip, which has not been implemented yet in
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# nixos/lib/make-options-doc/mergeJSON.py
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description = mdDoc ''
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Paths to keyboard devices.
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::: {.note}
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To avoid unnecessary triggers of the service unit, unplug devices in
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the order of the list.
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:::
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'';
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};
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config = mkOption {
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type = types.lines;
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example = ''
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(defsrc
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grv 1 2 3 4 5 6 7 8 9 0 - = bspc
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tab q w e r t y u i o p [ ] \
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caps a s d f g h j k l ; ' ret
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lsft z x c v b n m , . / rsft
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lctl lmet lalt spc ralt rmet rctl)
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(deflayer qwerty
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grv 1 2 3 4 5 6 7 8 9 0 - = bspc
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tab q w e r t y u i o p [ ] \
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@cap a s d f g h j k l ; ' ret
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lsft z x c v b n m , . / rsft
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lctl lmet lalt spc ralt rmet rctl)
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(defalias
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;; tap within 100ms for capslk, hold more than 100ms for lctl
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cap (tap-hold 100 100 caps lctl))
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'';
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description = mdDoc ''
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Configuration other than `defcfg`. See [example config
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files](https://github.com/jtroo/kanata) for more information.
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'';
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};
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extraDefCfg = mkOption {
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type = types.lines;
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default = "";
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example = "danger-enable-cmd yes";
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description = mdDoc ''
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Configuration of `defcfg` other than `linux-dev`. See [example
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config files](https://github.com/jtroo/kanata) for more information.
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'';
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};
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extraArgs = mkOption {
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type = types.listOf types.str;
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default = [ ];
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description = mdDoc "Extra command line arguments passed to kanata.";
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};
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port = mkOption {
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type = types.nullOr types.port;
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default = null;
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example = 6666;
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description = mdDoc ''
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Port to run the notification server on. `null` will not run the
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server.
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'';
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};
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};
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};
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mkName = name: "kanata-${name}";
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mkDevices = devices: concatStringsSep ":" devices;
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mkConfig = name: keyboard: pkgs.writeText "${mkName name}-config.kdb" ''
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(defcfg
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${keyboard.extraDefCfg}
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linux-dev ${mkDevices keyboard.devices})
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${keyboard.config}
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'';
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mkService = name: keyboard: nameValuePair (mkName name) {
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description = "kanata for ${mkDevices keyboard.devices}";
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# Because path units are used to activate service units, which
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# will start the old stopped services during "nixos-rebuild
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# switch", stopIfChanged here is a workaround to make sure new
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# services are running after "nixos-rebuild switch".
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stopIfChanged = false;
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serviceConfig = {
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ExecStart = ''
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${cfg.package}/bin/kanata \
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--cfg ${mkConfig name keyboard} \
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--symlink-path ''${RUNTIME_DIRECTORY}/${name} \
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${optionalString (keyboard.port != null) "--port ${toString keyboard.port}"} \
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${utils.escapeSystemdExecArgs keyboard.extraArgs}
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'';
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DynamicUser = true;
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RuntimeDirectory = mkName name;
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SupplementaryGroups = with config.users.groups; [
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input.name
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uinput.name
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];
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# hardening
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DeviceAllow = [
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"/dev/uinput rw"
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"char-input r"
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];
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CapabilityBoundingSet = [ "" ];
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DevicePolicy = "closed";
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IPAddressAllow = optional (keyboard.port != null) "localhost";
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IPAddressDeny = [ "any" ];
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LockPersonality = true;
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MemoryDenyWriteExecute = true;
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PrivateNetwork = keyboard.port == null;
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PrivateUsers = true;
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ProcSubset = "pid";
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ProtectClock = true;
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ProtectControlGroups = true;
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ProtectHome = true;
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ProtectHostname = true;
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ProtectKernelLogs = true;
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ProtectKernelModules = true;
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ProtectKernelTunables = true;
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ProtectProc = "invisible";
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RestrictAddressFamilies =
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if (keyboard.port == null) then "none" else [ "AF_INET" ];
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RestrictNamespaces = true;
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RestrictRealtime = true;
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SystemCallArchitectures = [ "native" ];
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SystemCallFilter = [
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"@system-service"
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"~@privileged"
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"~@resources"
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];
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UMask = "0077";
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};
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};
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mkPathName = i: name: "${mkName name}-${toString i}";
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mkPath = name: n: i: device:
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nameValuePair (mkPathName i name) {
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description =
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"${toString (i+1)}/${toString n} kanata trigger for ${name}, watching ${device}";
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wantedBy = optional (i == 0) "multi-user.target";
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pathConfig = {
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PathExists = device;
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# (ab)use systemd.path to construct a trigger chain so that the
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# service unit is only started when all paths exist
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# however, manual of systemd.path says Unit's suffix is not ".path"
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Unit =
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if (i + 1) == n
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then "${mkName name}.service"
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else "${mkPathName (i + 1) name}.path";
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};
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unitConfig.StopPropagatedFrom = optional (i > 0) "${mkName name}.service";
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};
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mkPaths = name: keyboard:
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let
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n = length keyboard.devices;
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in
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imap0 (mkPath name n) keyboard.devices
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;
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in
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{
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options.services.kanata = {
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enable = mkEnableOption "kanata";
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package = mkOption {
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type = types.package;
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default = pkgs.kanata;
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defaultText = lib.literalExpression "pkgs.kanata";
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example = lib.literalExpression "pkgs.kanata-with-cmd";
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description = mdDoc ''
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The kanata package to use.
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::: {.note}
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If `danger-enable-cmd` is enabled in any of the keyboards, the
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`kanata-with-cmd` package should be used.
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:::
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'';
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};
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keyboards = mkOption {
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type = types.attrsOf (types.submodule keyboard);
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default = { };
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description = mdDoc "Keyboard configurations.";
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};
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};
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config = lib.mkIf cfg.enable {
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hardware.uinput.enable = true;
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systemd = {
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paths = trivial.pipe cfg.keyboards [
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(mapAttrsToList mkPaths)
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concatLists
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listToAttrs
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];
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services = mapAttrs' mkService cfg.keyboards;
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};
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};
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meta.maintainers = with lib.maintainers; [ linj ];
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}
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