nixpkgs/nixos/modules/services/hardware/pcscd.nix

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{ config, pkgs, ... }:
let
cfgFile = pkgs.writeText "reader.conf" "";
in
with pkgs.lib;
{
###### interface
options = {
services.pcscd = {
enable = mkOption {
default = false;
description = "Whether to enable the PCSC-Lite daemon.";
};
};
};
###### implementation
config = mkIf config.services.pcscd.enable {
systemd.services.pcscd = {
description = "PCSC-Lite daemon";
wantedBy = [ "multi-user.target" ];
preStart = ''
mkdir -p /var/lib/pcsc
rm -Rf /var/lib/pcsc/drivers
ln -s ${pkgs.ccid}/pcsc/drivers /var/lib/pcsc/
'';
serviceConfig = {
Type = "forking";
ExecStart = "${pkgs.pcsclite}/sbin/pcscd -c ${cfgFile}";
};
};
};
}