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