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{ config, lib, ... }: let
validMac = str: builtins.match ''^[0-9a-fA-F]{2}(:[0-9a-fA-F]{2}){5}$'' str != null;
macAddressType = lib.types.str // {
check = validMac;
description = "a mac address (xx:xx:xx:xx:xx:xx)";
};
in {
options.networking.interfaceLabels = {
enable = lib.mkEnableOption "manually label network interfaces";
interfaces = lib.mkOption {
type = lib.types.attrsOf macAddressType;
default = {};
example = {
"lan0" = "00:11:22:33:44:55";
"lan1" = "66:77:88:99:AA:BB";
};
description = "label network interfaces by their mac address";
};
};
config = lib.mkIf config.networking.interfaceLabels.enable {
networking.usePredictableInterfaceNames = false;
services.udev.extraRules = lib.concatStringsSep "\n" (
lib.mapAttrsToList (name: mac: ''ACTION=="add", SUBSYSTEM=="net", ATTR{address}=="${mac}", NAME="${name}"'') config.networking.interfaceLabels.interfaces
);
};
}
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