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{ config, lib, pkgs, ... }:
with lib;
let
inherit (pkgs) ifplugd;
cfg = config.networking.interfaceMonitor;
# The ifplugd action script, which is called whenever the link
# status changes (i.e., a cable is plugged in or unplugged).
plugScript = pkgs.writeScript "ifplugd.action"
''
#! ${pkgs.stdenv.shell}
iface="$1"
status="$2"
${cfg.commands}
'';
in
{
###### interface
options = {
networking.interfaceMonitor.enable = mkOption {
type = types.bool;
default = false;
description = ''
If <literal>true</literal>, monitor Ethernet interfaces for
cables being plugged in or unplugged. When this occurs, the
commands specified in
<option>networking.interfaceMonitor.commands</option> are
executed.
'';
};
networking.interfaceMonitor.beep = mkOption {
type = types.bool;
default = false;
description = ''
If <literal>true</literal>, beep when an Ethernet cable is
plugged in or unplugged.
'';
};
networking.interfaceMonitor.commands = mkOption {
type = types.lines;
default = "";
description = ''
Shell commands to be executed when the link status of an
interface changes. On invocation, the shell variable
<varname>iface</varname> contains the name of the interface,
while the variable <varname>status</varname> contains either
<literal>up</literal> or <literal>down</literal> to indicate
the new status.
'';
};
};
###### implementation
config = mkIf cfg.enable {
systemd.services.ifplugd = {
description = "Network interface connectivity monitor";
after = [ "network-interfaces.target" ];
wantedBy = [ "multi-user.target" ];
script = ''
${ifplugd}/sbin/ifplugd --no-daemon --no-startup --no-shutdown \
${if config.networking.interfaceMonitor.beep then "" else "--no-beep"} \
--run ${plugScript}
'';
};
environment.systemPackages = [ ifplugd ];
};
}
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