49 lines
1.3 KiB
Nix
49 lines
1.3 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.services.fanout;
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mknodCmds = n: lib.lists.imap0 (i: s:
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"mknod /dev/fanout${builtins.toString i} c $MAJOR ${builtins.toString i}"
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) (lib.lists.replicate n "");
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in
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{
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options.services.fanout = {
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enable = lib.mkEnableOption "fanout";
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fanoutDevices = lib.mkOption {
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type = lib.types.int;
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default = 1;
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description = "Number of /dev/fanout devices";
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};
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bufferSize = lib.mkOption {
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type = lib.types.int;
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default = 16384;
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description = "Size of /dev/fanout buffer in bytes";
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};
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};
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config = lib.mkIf cfg.enable {
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boot.extraModulePackages = [ config.boot.kernelPackages.fanout.out ];
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boot.kernelModules = [ "fanout" ];
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boot.extraModprobeConfig = ''
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options fanout buffersize=${builtins.toString cfg.bufferSize}
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'';
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systemd.services.fanout = {
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description = "Bring up /dev/fanout devices";
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script = ''
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MAJOR=$(${pkgs.gnugrep}/bin/grep fanout /proc/devices | ${pkgs.gawk}/bin/awk '{print $1}')
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${lib.strings.concatLines (mknodCmds cfg.fanoutDevices)}
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'';
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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Type = "oneshot";
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User = "root";
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RemainAfterExit = "yes";
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Restart = "no";
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};
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};
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};
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}
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