atagen

roundabout

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Blame: nix/nixos-module.nix

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self:
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{
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  config,
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  lib,
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  pkgs,
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  ...
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}:
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let
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  cfg = config.programs.roundabout;
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  toml = pkgs.formats.toml { };
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  plugin = pkgs.callPackage ./plugin.nix { roundabout = cfg.package; };
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in
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{
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  options.programs.roundabout = {
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    enable = lib.mkEnableOption "roundabout, build admission for agents";
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    package = lib.mkOption {
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      type = lib.types.package;
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      default = self.packages.${pkgs.stdenv.hostPlatform.system}.roundabout;
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      defaultText = lib.literalExpression "roundabout.packages.\${system}.roundabout";
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      description = "the roundabout package";
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    };
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    socketActivation = lib.mkOption {
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      type = lib.types.bool;
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      default = true;
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      description = ''
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        let a systemd user socket own `$XDG_RUNTIME_DIR/roundabout.sock` and start the
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        daemon on demand. when disabled, the first client spawns daemon instead
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      '';
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    };
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    settings = lib.mkOption {
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      inherit (toml) type;
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      default = { };
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      example = lib.literalExpression ''
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        {
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          budget.ram = "16GiB";
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          enforce.unwrapped = "wrap";
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          artifacts.stop = "block";
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        }
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      '';
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      description = ''
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        written to `/etc/roundabout/config.toml`, which anyone without a
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        `~/.config/roundabout/config.toml` of their own gets. see readme
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      '';
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    };
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    claude = {
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      hooks = lib.mkOption {
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        type = lib.types.attrs;
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        readOnly = true;
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        default = import ./hooks.nix {
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          inherit lib;
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          roundabout = cfg.package;
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        };
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        defaultText = lib.literalMD "roundabout's hooks, keyed by event";
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        description = ''
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          hooks in `settings.json` shape, for whatever writes your claude config.
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          lists concatenate under the json format type, so they sit alongside
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          hooks you already have
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        '';
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      };
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      skill = lib.mkOption {
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        type = lib.types.path;
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        readOnly = true;
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        default = "${plugin}/plugins/roundabout/skills/roundabout";
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        defaultText = lib.literalMD "the roundabout skill directory";
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        description = "the skill directory, for configs that manage `~/.claude/skills` themselves";
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      };
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      plugin = lib.mkOption {
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        type = lib.types.package;
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        readOnly = true;
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        default = plugin;
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        defaultText = lib.literalMD "the roundabout plugin marketplace";
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        description = "hooks and skill as a marketplace, for `claude plugin marketplace add`";
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      };
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    };
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  };
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  config = lib.mkIf cfg.enable {
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    environment.systemPackages = [ cfg.package ];
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    # a real file rather than the usual /etc/static symlink, so a rebuild
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    # renames over it where the daemon's inotify watch can see
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    environment.etc."roundabout/config.toml" = lib.mkIf (cfg.settings != { }) {
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      source = toml.generate "roundabout-config.toml" cfg.settings;
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      mode = "0444";
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    };
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    systemd.user.sockets.roundabout = lib.mkIf cfg.socketActivation {
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      description = "roundabout build admission socket";
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      wantedBy = [ "sockets.target" ];
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      listenStreams = [ "%t/roundabout.sock" ];
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      socketConfig.SocketMode = "0600";
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    };
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    systemd.user.services.roundabout = lib.mkIf cfg.socketActivation {
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      description = "roundabout build admission daemon";
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      serviceConfig.ExecStart = "${lib.getExe cfg.package} daemon";
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    };
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  };
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}