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|
{ config, lib, pkgs, ... }:
with lib;
let
cfgFile = pkgs.writeText "reader.conf" config.services.pcscd.readerConfig;
package = if config.security.polkit.enable
then pkgs.pcscliteWithPolkit
else pkgs.pcsclite;
pluginEnv = pkgs.buildEnv {
name = "pcscd-plugins";
paths = map (p: "${p}/pcsc/drivers") config.services.pcscd.plugins;
};
in
{
###### interface
options.services.pcscd = {
enable = mkEnableOption (lib.mdDoc "PCSC-Lite daemon");
plugins = mkOption {
type = types.listOf types.package;
defaultText = literalExpression "[ pkgs.ccid ]";
example = literalExpression "[ pkgs.pcsc-cyberjack ]";
description = lib.mdDoc "Plugin packages to be used for PCSC-Lite.";
};
readerConfig = mkOption {
type = types.lines;
default = "";
example = ''
FRIENDLYNAME "Some serial reader"
DEVICENAME /dev/ttyS0
LIBPATH /path/to/serial_reader.so
CHANNELID 1
'';
description = lib.mdDoc ''
Configuration for devices that aren't hotpluggable.
See {manpage}`reader.conf(5)` for valid options.
'';
};
};
###### implementation
config = mkIf config.services.pcscd.enable {
environment.etc."reader.conf".source = cfgFile;
environment.systemPackages = [ package ];
systemd.packages = [ (getBin package) ];
services.pcscd.plugins = [ pkgs.ccid ];
systemd.sockets.pcscd.wantedBy = [ "sockets.target" ];
systemd.services.pcscd = {
environment.PCSCLITE_HP_DROPDIR = pluginEnv;
restartTriggers = [ "/etc/reader.conf" ];
# If the cfgFile is empty and not specified (in which case the default
# /etc/reader.conf is assumed), pcscd will happily start going through the
# entire confdir (/etc in our case) looking for a config file and try to
# parse everything it finds. Doesn't take a lot of imagination to see how
# well that works. It really shouldn't do that to begin with, but to work
# around it, we force the path to the cfgFile.
#
# https://github.com/NixOS/nixpkgs/issues/121088
serviceConfig.ExecStart = [ "" "${getBin package}/bin/pcscd -f -x -c ${cfgFile}" ];
};
};
}
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