{ config, lib, pkgs, ... }: with lib; let cfg = config.hardware.sane.brscan4; netDeviceList = attrValues cfg.netDevices; etcFiles = pkgs.callPackage ./brscan4_etc_files.nix { netDevices = netDeviceList; }; netDeviceOpts = { name, config, ... }: { options = { name = mkOption { type = types.str; description = '' The friendly name you give to the network device. If undefined, the name of attribute will be used. ''; example = literalExample "office1"; }; model = mkOption { type = types.str; description = '' The model of the network device. ''; example = literalExample "MFC-7860DW"; }; ip = mkOption { type = with types; nullOr str; default = null; description = '' The ip address of the device. If undefined, you will have to provide a nodename. ''; example = literalExample "192.168.1.2"; }; nodename = mkOption { type = with types; nullOr str; default = null; description = '' The node name of the device. If undefined, you will have to provide an ip. ''; example = literalExample "BRW0080927AFBCE"; }; }; config = { name = mkDefault name; }; }; in { options = { hardware.sane.brscan4.enable = mkEnableOption "Brother's brscan4 scan backend" // { description = '' When enabled, will automatically register the "brscan4" sane backend and bring configuration files to their expected location. ''; }; hardware.sane.brscan4.netDevices = mkOption { default = {}; example = { office1 = { model = "MFC-7860DW"; ip = "192.168.1.2"; }; office2 = { model = "MFC-7860DW"; nodename = "BRW0080927AFBCE"; }; }; type = with types; loaOf (submodule netDeviceOpts); description = '' The list of network devices that will be registered against the brscan4 sane backend. ''; }; }; config = mkIf (config.hardware.sane.enable && cfg.enable) { hardware.sane.extraBackends = [ pkgs.brscan4 ]; environment.etc = singleton { target = "opt/brother/scanner/brscan4"; source = "${etcFiles}/etc/opt/brother/scanner/brscan4"; }; assertions = [ { assertion = all (x: !(null != x.ip && null != x.nodename)) netDeviceList; message = '' When describing a network device as part of the attribute list `hardware.sane.brscan4.netDevices`, only one of its `ip` or `nodename` attribute should be specified, not both! ''; } ]; }; }