nixpkgs/modules/services/networking/ifplugd.nix
Eelco Dolstra 35734279ae * Fix incorrect default value.
svn path=/nixos/trunk/; revision=32431
2012-02-20 16:53:44 +00:00

89 lines
2.2 KiB
Nix

{pkgs, config, ...}:
with pkgs.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). 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}
iface="$1"
status="$2"
${cfg.commands}
'';
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.
'';
};
networking.interfaceMonitor.commands = mkOption {
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 {
jobs.ifplugd =
{ description = "Network interface connectivity monitor";
startOn = "started network-interfaces";
stopOn = "stopping network-interfaces";
exec =
''
${ifplugd}/sbin/ifplugd --no-daemon --no-startup --no-shutdown \
${if config.networking.interfaceMonitor.beep then "" else "--no-beep"} \
--run ${plugScript}
'';
};
environment.systemPackages = [ ifplugd ];
};
}