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# LXC Configuration

{ config, lib, pkgs, ... }:

with lib;

let

  cfg = config.virtualisation.lxc;

in

{
  ###### interface

  options.virtualisation.lxc = {
    enable =
      mkOption {
        type = types.bool;
        default = false;
        description =
          ''
            This enables Linux Containers (LXC), which provides tools
            for creating and managing system or application containers
            on Linux.
          '';
      };

    systemConfig =
      mkOption {
        type = types.lines;
        default = "";
        description =
          ''
            This is the system-wide LXC config. See lxc.system.conf(5).
          '';
      };

    defaultConfig =
      mkOption {
        type = types.lines;
        default = "";
        description =
          ''
            Default config (default.conf) for new containers, i.e. for
            network config. See lxc.container.conf(5).
          '';
      };

    usernetConfig =
      mkOption {
        type = types.lines;
        default = "";
        description =
          ''
            This is the config file for managing unprivileged user network
            administration access in LXC. See lxc-user-net(5).
          '';
      };

  };

  ###### implementation

  config = mkIf cfg.enable {

    environment.systemPackages = [ pkgs.lxc ];

    environment.etc."lxc/lxc.conf".text = cfg.systemConfig;
    environment.etc."lxc/lxc-usernet".text = cfg.usernetConfig;
    environment.etc."lxc/default.conf".text = cfg.defaultConfig;

  };

}