nixpkgs/modules/services/networking/ifplugd.nix

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{pkgs, config, ...}:
with pkgs.lib;
let
inherit (pkgs) ifplugd;
# The ifplugd action script, which is called whenever the link
# status changes (i.e., a cable is plugged in or unplugged). We do
# nothing when a cable is unplugged. When a cable is plugged in, we
# restart dhclient, which will hopefully give us a new IP address
# if appropriate.
plugScript = pkgs.writeScript "ifplugd.action"
''
#! ${pkgs.stdenv.shell}
if test "$2" = up; then
initctl stop dhclient
sleep 1
initctl start dhclient
fi
'';
in
{
###### interface
options = {
networking.interfaceMonitor.enable = mkOption {
default = false;
description = "
If <literal>true</literal>, monitor Ethernet interfaces for
cables being plugged in or unplugged. When this occurs, the
<command>dhclient</command> service is restarted to
automatically obtain a new IP address. This is useful for
roaming users (laptops).
";
};
networking.interfaceMonitor.beep = mkOption {
default = false;
description = "
If <literal>true</literal>, beep when an Ethernet cable is
plugged in or unplugged.
";
};
};
###### implementation
config = mkIf config.networking.interfaceMonitor.enable {
jobs.ifplugd =
{ description = "Network interface connectivity monitor";
startOn = "network-interfaces/started";
stopOn = "network-interfaces/stop";
exec =
''
${ifplugd}/sbin/ifplugd --no-daemon --no-startup --no-shutdown \
${if config.networking.interfaceMonitor.beep then "" else "--no-beep"} \
--run ${plugScript}
'';
};
environment.systemPackages = [ifplugd];
};
}