nixpkgs/modules/services/networking/wpa_supplicant.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
configFile = "/etc/wpa_supplicant.conf";
ifaces =
config.networking.wireless.interfaces ++
optional (config.networking.WLANInterface != "") config.networking.WLANInterface;
in
{
###### interface
options = {
networking.wireless.enable = mkOption {
default = false;
description = ''
Whether to start <command>wpa_supplicant</command> to scan for
and associate with wireless networks. Note: NixOS currently
does not generate <command>wpa_supplicant</command>'s
configuration file, <filename>${configFile}</filename>. You
should edit this file yourself to define wireless networks,
WPA keys and so on (see
<citerefentry><refentrytitle>wpa_supplicant.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry>).
'';
};
networking.WLANInterface = mkOption {
default = "";
description = "Obsolete. Use <option>networking.wireless.interfaces</option> instead.";
};
networking.wireless.interfaces = mkOption {
default = [];
example = [ "wlan0" "wlan1" ];
description = ''
The interfaces <command>wpa_supplicant</command> will use. If empty, it will
automatically use all wireless interfaces.
'';
};
};
###### implementation
config = mkIf config.networking.wireless.enable {
environment.systemPackages = [ pkgs.wpa_supplicant ];
services.dbus.packages = [ pkgs.wpa_supplicant ];
jobs.wpa_supplicant =
{ startOn = "started network-interfaces";
stopOn = "stopping network-interfaces";
path = [ pkgs.wpa_supplicant ];
preStart =
''
touch -a ${configFile}
chmod 600 ${configFile}
'';
script =
''
${if ifaces == [] then ''
for i in $(cd /sys/class/net && echo *); do
if [ -e /sys/class/net/$i/wireless ]; then
ifaces="$ifaces''${ifaces:+ -N} -i$i"
fi
done
'' else ''
ifaces="${concatStringsSep " -N " (map (i: "-i${i}") ifaces)}"
''}
exec wpa_supplicant -s -u -c ${configFile} $ifaces
'';
};
powerManagement.resumeCommands =
''
${config.system.build.upstart}/sbin/restart wpa_supplicant
'';
};
}