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29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
89 lines
2.1 KiB
Nix
89 lines
2.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with 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).
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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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type = types.bool;
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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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commands specified in
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<option>networking.interfaceMonitor.commands</option> are
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executed.
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'';
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};
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networking.interfaceMonitor.beep = mkOption {
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type = types.bool;
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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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type = types.lines;
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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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